Android插件化基础2----理解Context

/**
 * Interface to global information about an application environment.  This is
 * an abstract class whose implementation is provided by
 * the Android system.  It
 * allows access to application-specific resources and classes, as well as
 * up-calls for application-level operations such as launching activities,
 * broadcasting and receiving intents, etc.
 */
public abstract class Context {
   //省略代码
    final void attach(Context context, ActivityThread aThread,
            Instrumentation instr, IBinder token, int ident,
            Application application, Intent intent, ActivityInfo info,
            CharSequence title, Activity parent, String id,
            NonConfigurationInstances lastNonConfigurationInstances,
            Configuration config, String referrer, IVoiceInteractor voiceInteractor,
            Window window) {
        attachBaseContext(context);

        mFragments.attachHost(null /*parent*/);

        mWindow = new PhoneWindow(this, window);
        mWindow.setWindowControllerCallback(this);
        mWindow.setCallback(this);
        mWindow.setOnWindowDismissedCallback(this);
        mWindow.getLayoutInflater().setPrivateFactory(this);
        if (info.softInputMode != WindowManager.LayoutParams.SOFT_INPUT_STATE_UNSPECIFIED) {
            mWindow.setSoftInputMode(info.softInputMode);
        }
        if (info.uiOptions != 0) {
            mWindow.setUiOptions(info.uiOptions);
        }
        mUiThread = Thread.currentThread();

        mMainThread = aThread;
        mInstrumentation = instr;
        mToken = token;
        mIdent = ident;
        mApplication = application;
        mIntent = intent;
        mReferrer = referrer;
        mComponent = intent.getComponent();
        mActivityInfo = info;
        mTitle = title;
        mParent = parent;
        mEmbeddedID = id;
        mLastNonConfigurationInstances = lastNonConfigurationInstances;
        if (voiceInteractor != null) {
            if (lastNonConfigurationInstances != null) {
                mVoiceInteractor = lastNonConfigurationInstances.voiceInteractor;
            } else {
                mVoiceInteractor = new VoiceInteractor(voiceInteractor, this, this,
                        Looper.myLooper());
            }
        }

        mWindow.setWindowManager(
                (WindowManager)context.getSystemService(Context.WINDOW_SERVICE),
                mToken, mComponent.flattenToString(),
                (info.flags & ActivityInfo.FLAG_HARDWARE_ACCELERATED) != 0);
        if (mParent != null) {
            mWindow.setContainer(mParent.getWindow());
        }
        mWindowManager = mWindow.getWindowManager();
        mCurrentConfig = config;
    }
   //省略代码
}

/**
 * Proxying implementation of Context that simply delegates all of its calls to
 * another Context.  Can be subclassed to modify behavior without changing
 * the original Context.
 */
public class ContextWrapper extends Context {
    Context mBase;

    public ContextWrapper(Context base) {
        mBase = base;
    }
    
    /**
     * Set the base context for this ContextWrapper.  All calls will then be
     * delegated to the base context.  Throws
     * IllegalStateException if a base context has already been set.
     * 
     * @param base The new base context for this wrapper.
     */
    protected void attachBaseContext(Context base) {
        if (mBase != null) {
            throw new IllegalStateException("Base context already set");
        }
        mBase = base;
    }

    /**
     * @return the base context as set by the constructor or setBaseContext
     */
    public Context getBaseContext() {
        return mBase;
    }

    @Override
    public AssetManager getAssets() {
        return mBase.getAssets();
    }

    @Override
    public Resources getResources() {
        return mBase.getResources();
    }

    @Override
    public PackageManager getPackageManager() {
        return mBase.getPackageManager();
    }

    @Override
    public ContentResolver getContentResolver() {
        return mBase.getContentResolver();
    }
  //省略了部分代码 
}

/**
 * A context wrapper that allows you to modify or replace the theme of the
 * wrapped context.
 */
public class ContextThemeWrapper extends ContextWrapper {
     //省略部分代码
    /**
     * Creates a new context wrapper with no theme and no base context.
     * <p>
     * <stong>Note:</strong> A base context <strong>must</strong> be attached
     * using {@link #attachBaseContext(Context)} before calling any other
     * method on the newly constructed context wrapper.
     */
    public ContextThemeWrapper() {
        super(null);
    }

    /**
     * Creates a new context wrapper with the specified theme.
     * <p>
     * The specified theme will be applied on top of the base context's theme.
     * Any attributes not explicitly defined in the theme identified by
     * <var>themeResId</var> will retain their original values.
     *
     * @param base the base context
     * @param themeResId the resource ID of the theme to be applied on top of
     *                   the base context's theme
     */
    public ContextThemeWrapper(Context base, @StyleRes int themeResId) {
        super(base);
        mThemeResource = themeResId;
    }

    /**
     * Creates a new context wrapper with the specified theme.
     * <p>
     * Unlike {@link #ContextThemeWrapper(Context, int)}, the theme passed to
     * this constructor will completely replace the base context's theme.
     *
     * @param base the base context
     * @param theme the theme against which resources should be inflated
     */
    public ContextThemeWrapper(Context base, Resources.Theme theme) {
        super(base);
        mTheme = theme;
    }

    @Override
    protected void attachBaseContext(Context newBase) {
        super.attachBaseContext(newBase);
    }
   //省略部分代码
}

public abstract class Service extends ContextWrapper implements ComponentCallbacks2 {
    //省略部分代码
  
    public Service() {
        super(null);
    }

    /** Return the application that owns this service. */
    public final Application getApplication() {
        return mApplication;
    }

    public final void attach(
            Context context,
            ActivityThread thread, String className, IBinder token,
            Application application, Object activityManager) {
        attachBaseContext(context);
        mThread = thread;           // NOTE:  unused - remove?
        mClassName = className;
        mToken = token;
        mApplication = application;
        mActivityManager = (IActivityManager)activityManager;
        mStartCompatibility = getApplicationInfo().targetSdkVersion
                < Build.VERSION_CODES.ECLAIR;
    }
}

public class Application extends ContextWrapper implements ComponentCallbacks2 {
   //省略部分代码
    public Application() {
        super(null);
    }

    final void attach(Context context) {
        attachBaseContext(context);
        mLoadedApk = ContextImpl.getImpl(context).mPackageInfo;
    }
   //省略部分代码
}

public class Activity extends ContextThemeWrapper
        implements LayoutInflater.Factory2,
        Window.Callback, KeyEvent.Callback,
        OnCreateContextMenuListener, ComponentCallbacks2,
        Window.OnWindowDismissedCallback, WindowControllerCallback {
       //省略部分代码
}

/**
 * Common implementation of Context API, which provides the base
 * context object for Activity and other application components.
 */
class ContextImpl extends Context {
    final LoadedApk mPackageInfo;
    //省略部分代码
    private ContextImpl(ContextImpl container, ActivityThread mainThread,
            LoadedApk packageInfo, IBinder activityToken, UserHandle user, int flags,
            Display display, Configuration overrideConfiguration, int createDisplayWithId) {
        mOuterContext = this;

        // If creator didn't specify which storage to use, use the default
        // location for application.
        if ((flags & (Context.CONTEXT_CREDENTIAL_PROTECTED_STORAGE
                | Context.CONTEXT_DEVICE_PROTECTED_STORAGE)) == 0) {
            final File dataDir = packageInfo.getDataDirFile();
            if (Objects.equals(dataDir, packageInfo.getCredentialProtectedDataDirFile())) {
                flags |= Context.CONTEXT_CREDENTIAL_PROTECTED_STORAGE;
            } else if (Objects.equals(dataDir, packageInfo.getDeviceProtectedDataDirFile())) {
                flags |= Context.CONTEXT_DEVICE_PROTECTED_STORAGE;
            }
        }

        mMainThread = mainThread;
        mActivityToken = activityToken;
        mFlags = flags;

        if (user == null) {
            user = Process.myUserHandle();
        }
        mUser = user;

        mPackageInfo = packageInfo;
        mResourcesManager = ResourcesManager.getInstance();

        final int displayId = (createDisplayWithId != Display.INVALID_DISPLAY)
                ? createDisplayWithId
                : (display != null) ? display.getDisplayId() : Display.DEFAULT_DISPLAY;

        CompatibilityInfo compatInfo = null;
        if (container != null) {
            compatInfo = container.getDisplayAdjustments(displayId).getCompatibilityInfo();
        }
        if (compatInfo == null) {
            compatInfo = (displayId == Display.DEFAULT_DISPLAY)
                    ? packageInfo.getCompatibilityInfo()
                    : CompatibilityInfo.DEFAULT_COMPATIBILITY_INFO;
        }

        Resources resources = packageInfo.getResources(mainThread);
        if (resources != null) {
            if (displayId != Display.DEFAULT_DISPLAY
                    || overrideConfiguration != null
                    || (compatInfo != null && compatInfo.applicationScale
                            != resources.getCompatibilityInfo().applicationScale)) {

                if (container != null) {
                    // This is a nested Context, so it can't be a base Activity context.
                    // Just create a regular Resources object associated with the Activity.
                    resources = mResourcesManager.getResources(
                            activityToken,
                            packageInfo.getResDir(),
                            packageInfo.getSplitResDirs(),
                            packageInfo.getOverlayDirs(),
                            packageInfo.getApplicationInfo().sharedLibraryFiles,
                            displayId,
                            overrideConfiguration,
                            compatInfo,
                            packageInfo.getClassLoader());
                } else {
                    // This is not a nested Context, so it must be the root Activity context.
                    // All other nested Contexts will inherit the configuration set here.
                    resources = mResourcesManager.createBaseActivityResources(
                            activityToken,
                            packageInfo.getResDir(),
                            packageInfo.getSplitResDirs(),
                            packageInfo.getOverlayDirs(),
                            packageInfo.getApplicationInfo().sharedLibraryFiles,
                            displayId,
                            overrideConfiguration,
                            compatInfo,
                            packageInfo.getClassLoader());
                }
            }
        }
        mResources = resources;

        mDisplay = (createDisplayWithId == Display.INVALID_DISPLAY) ? display
                : mResourcesManager.getAdjustedDisplay(displayId, mResources.getDisplayAdjustments());

        if (container != null) {
            mBasePackageName = container.mBasePackageName;
            mOpPackageName = container.mOpPackageName;
        } else {
            mBasePackageName = packageInfo.mPackageName;
            ApplicationInfo ainfo = packageInfo.getApplicationInfo();
            if (ainfo.uid == Process.SYSTEM_UID && ainfo.uid != Process.myUid()) {
                // Special case: system components allow themselves to be loaded in to other
                // processes.  For purposes of app ops, we must then consider the context as
                // belonging to the package of this process, not the system itself, otherwise
                // the package+uid verifications in app ops will fail.
                mOpPackageName = ActivityThread.currentPackageName();
            } else {
                mOpPackageName = mBasePackageName;
            }
        }
        mContentResolver = new ApplicationContentResolver(this, mainThread, user);
    }

    static ContextImpl createSystemContext(ActivityThread mainThread) {
        LoadedApk packageInfo = new LoadedApk(mainThread);
        ContextImpl context = new ContextImpl(null, mainThread,
                packageInfo, null, null, 0, null, null, Display.INVALID_DISPLAY);
        context.mResources.updateConfiguration(context.mResourcesManager.getConfiguration(),
                context.mResourcesManager.getDisplayMetrics());
        return context;
    }

    static ContextImpl createAppContext(ActivityThread mainThread, LoadedApk packageInfo) {
        if (packageInfo == null) throw new IllegalArgumentException("packageInfo");
        return new ContextImpl(null, mainThread,
                packageInfo, null, null, 0, null, null, Display.INVALID_DISPLAY);
    }

    static ContextImpl createActivityContext(ActivityThread mainThread,
            LoadedApk packageInfo, IBinder activityToken, int displayId,
            Configuration overrideConfiguration) {
        if (packageInfo == null) throw new IllegalArgumentException("packageInfo");
        return new ContextImpl(null, mainThread, packageInfo, activityToken, null, 0,
                null, overrideConfiguration, displayId);
    }
   //省略部分代码
}

    //ActivityThread.java
    private void handleBindApplication(AppBindData data) {
          //省略部分代码
        
        try {
            // If the app is being launched for full backup or restore, bring it up in
            // a restricted environment with the base application class.
            Application app = data.info.makeApplication(data.restrictedBackupMode, null);
            mInitialApplication = app;

            if (!data.restrictedBackupMode) {
                if (!ArrayUtils.isEmpty(data.providers)) {
                    installContentProviders(app, data.providers);
                    // For process that contains content providers, we want to
                    // ensure that the JIT is enabled "at some point".
                    mH.sendEmptyMessageDelayed(H.ENABLE_JIT, 10*1000);
                }
            }
            try {
                mInstrumentation.onCreate(data.instrumentationArgs);
            }
            catch (Exception e) {
                throw new RuntimeException(
                    "Exception thrown in onCreate() of "
                    + data.instrumentationName + ": " + e.toString(), e);
            }

            try {
                mInstrumentation.callApplicationOnCreate(app);
            } catch (Exception e) {
                if (!mInstrumentation.onException(app, e)) {
                    throw new RuntimeException(
                        "Unable to create application " + app.getClass().getName()
                        + ": " + e.toString(), e);
                }
            }
        } finally {
            StrictMode.setThreadPolicy(savedPolicy);
        }
    }
      //省略部分代码

 public Application makeApplication(boolean forceDefaultAppClass,
            Instrumentation instrumentation) {
        if (mApplication != null) {
            return mApplication;
        }
        Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "makeApplication");
        Application app = null;
        String appClass = mApplicationInfo.className;
        if (forceDefaultAppClass || (appClass == null)) {
            appClass = "android.app.Application";
        }
        try {
            java.lang.ClassLoader cl = getClassLoader();
            if (!mPackageName.equals("android")) {
                Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER,
                        "initializeJavaContextClassLoader");
                initializeJavaContextClassLoader();
                Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
            }

************************重点******************************
            ContextImpl appContext = ContextImpl.createAppContext(mActivityThread, this);
            app = mActivityThread.mInstrumentation.newApplication(
                    cl, appClass, appContext);
            appContext.setOuterContext(app);
************************重点******************************
        } catch (Exception e) {
            if (!mActivityThread.mInstrumentation.onException(app, e)) {
                Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                throw new RuntimeException(
                    "Unable to instantiate application " + appClass
                    + ": " + e.toString(), e);
            }
        }
        mActivityThread.mAllApplications.add(app);
        mApplication = app;
       //省略部分代码
    }

  public Application newApplication(ClassLoader cl, String className, Context context)
            throws InstantiationException, IllegalAccessException, 
            ClassNotFoundException {
        return newApplication(cl.loadClass(className), context);
    }

    static public Application newApplication(Class<?> clazz, Context context)
            throws InstantiationException, IllegalAccessException, 
            ClassNotFoundException {
        Application app = (Application)clazz.newInstance();
        app.attach(context);
        return app;
    }

        @Override
        public final void scheduleLaunchActivity(Intent intent, IBinder token, int ident,
                ActivityInfo info, Configuration curConfig, Configuration overrideConfig,
                CompatibilityInfo compatInfo, String referrer, IVoiceInteractor voiceInteractor,
                int procState, Bundle state, PersistableBundle persistentState,
                List<ResultInfo> pendingResults, List<ReferrerIntent> pendingNewIntents,
                boolean notResumed, boolean isForward, ProfilerInfo profilerInfo) {
            updateProcessState(procState, false);
            ActivityClientRecord r = new ActivityClientRecord();
            r.token = token;
            r.ident = ident;
            r.intent = intent;
            r.referrer = referrer;
            r.voiceInteractor = voiceInteractor;
            r.activityInfo = info;
            r.compatInfo = compatInfo;
            r.state = state;
            r.persistentState = persistentState;
            r.pendingResults = pendingResults;
            r.pendingIntents = pendingNewIntents;
            r.startsNotResumed = notResumed;
            r.isForward = isForward;
            r.profilerInfo = profilerInfo;
            r.overrideConfig = overrideConfig;
            updatePendingConfiguration(curConfig);
            sendMessage(H.LAUNCH_ACTIVITY, r);
        }

  private class H extends Handler {
        //省略部分代码
       public void handleMessage(Message msg) {
            if (DEBUG_MESSAGES) Slog.v(TAG, ">>> handling: " + codeToString(msg.what));
            switch (msg.what) {
                case LAUNCH_ACTIVITY: {
                    Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER, "activityStart");
                    final ActivityClientRecord r = (ActivityClientRecord) msg.obj;

                    r.packageInfo = getPackageInfoNoCheck(
                            r.activityInfo.applicationInfo, r.compatInfo);
                    handleLaunchActivity(r, null, "LAUNCH_ACTIVITY");
                    Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                } break;
            //省略部分代码
         }
      //省略部分代码
}

     //ActiviyThread.java
    private void handleLaunchActivity(ActivityClientRecord r, Intent customIntent, String reason) {
         //省略部分代码
        Activity a = performLaunchActivity(r, customIntent);
        if (a != null) {
            r.createdConfig = new Configuration(mConfiguration);
            reportSizeConfigurations(r);
            Bundle oldState = r.state;
            handleResumeActivity(r.token, false, r.isForward,
                    !r.activity.mFinished && !r.startsNotResumed, r.lastProcessedSeq, reason);

            if (!r.activity.mFinished && r.startsNotResumed) {
          
                performPauseActivityIfNeeded(r, reason);

                if (r.isPreHoneycomb()) {
                    r.state = oldState;
                }
            }
        } else {
             //省略部分代码
        }
    }

     //ActiviyThread.java
 private Activity performLaunchActivity(ActivityClientRecord r, Intent customIntent) {
        //省略部分代码
************************重点******************************
        Activity activity = null;
        try {
            java.lang.ClassLoader cl = r.packageInfo.getClassLoader();
            activity = mInstrumentation.newActivity(
                    cl, component.getClassName(), r.intent);
            StrictMode.incrementExpectedActivityCount(activity.getClass());
            r.intent.setExtrasClassLoader(cl);
            r.intent.prepareToEnterProcess();
            if (r.state != null) {
                r.state.setClassLoader(cl);
            }
        } catch (Exception e) {
            if (!mInstrumentation.onException(activity, e)) {
                throw new RuntimeException(
                    "Unable to instantiate activity " + component
                    + ": " + e.toString(), e);
            }
        }
            //省略部分代码
            if (activity != null) {
                Context appContext = createBaseContextForActivity(r, activity);
                //省略部分代码
                activity.attach(appContext, this, getInstrumentation(), r.token,
                        r.ident, app, r.intent, r.activityInfo, title, r.parent,
                        r.embeddedID, r.lastNonConfigurationInstances, config,
                        r.referrer, r.voiceInteractor, window);
************************重点******************************
              //省略部分代码
    }

   public Activity newActivity(ClassLoader cl, String className,
            Intent intent)
            throws InstantiationException, IllegalAccessException,
            ClassNotFoundException {
        return (Activity)cl.loadClass(className).newInstance();
    }

         //ActivityThread.java
        public final void scheduleCreateService(IBinder token,
                ServiceInfo info, CompatibilityInfo compatInfo, int processState) {
            updateProcessState(processState, false);
            CreateServiceData s = new CreateServiceData();
            s.token = token;
            s.info = info;
            s.compatInfo = compatInfo;
            sendMessage(H.CREATE_SERVICE, s);
        }

  private class H extends Handler {
        //省略部分代码
       public void handleMessage(Message msg) {
            if (DEBUG_MESSAGES) Slog.v(TAG, ">>> handling: " + codeToString(msg.what));
            switch (msg.what) {
                    case CREATE_SERVICE:
                    //省略部分代码
                    handleCreateService((CreateServiceData)msg.obj);
                    //省略部分代码
                    break;
            //省略部分代码
         }
      //省略部分代码
}

private void handleCreateService(CreateServiceData data) {
************************重点******************************
        //省略部分代码
        LoadedApk packageInfo = getPackageInfoNoCheck(
                data.info.applicationInfo, data.compatInfo);
        Service service = null;
        try {
            java.lang.ClassLoader cl = packageInfo.getClassLoader();
            service = (Service) cl.loadClass(data.info.name).newInstance();
        } catch (Exception e) {
            if (!mInstrumentation.onException(service, e)) {
                throw new RuntimeException(
                    "Unable to instantiate service " + data.info.name
                    + ": " + e.toString(), e);
            }
        }
            //省略部分代码
            ContextImpl context = ContextImpl.createAppContext(this, packageInfo);
            context.setOuterContext(service);

            Application app = packageInfo.makeApplication(false, mInstrumentation);
            service.attach(context, this, data.info.name, data.token, app,
                    ActivityManagerNative.getDefault());
************************重点******************************
           //省略部分代码
    }

    public final Application getApplication() {
        return mApplication;
    }

final void attach(Context context, ActivityThread aThread,
            Instrumentation instr, IBinder token, int ident,
            Application application, Intent intent, ActivityInfo info,
            CharSequence title, Activity parent, String id,
            NonConfigurationInstances lastNonConfigurationInstances,
            Configuration config, String referrer, IVoiceInteractor voiceInteractor,
            Window window) {
      //省略部分代码
      mApplication = application;
      //省略部分代码
}

private Activity performLaunchActivity(ActivityClientRecord r, Intent customIntent) {
          //省略部分代码
           Application app = r.packageInfo.makeApplication(false, mInstrumentation);
         //省略部分代码
           activity.attach(appContext, this, getInstrumentation(), r.token,
                        r.ident, app, r.intent, r.activityInfo, title, r.parent,
                        r.embeddedID, r.lastNonConfigurationInstances, config,
                        r.referrer, r.voiceInteractor, window);
        //省略部分代码
}

    //LoadedApk.java
    public Application makeApplication(boolean forceDefaultAppClass,
            Instrumentation instrumentation) {
        if (mApplication != null) {
            return mApplication;
        }
        //省略部分代码
       Application app = null;
        String appClass = mApplicationInfo.className;
        if (forceDefaultAppClass || (appClass == null)) {
            appClass = "android.app.Application";
        }
        try {
            java.lang.ClassLoader cl = getClassLoader();
            if (!mPackageName.equals("android")) {
                Trace.traceBegin(Trace.TRACE_TAG_ACTIVITY_MANAGER,
                        "initializeJavaContextClassLoader");
                initializeJavaContextClassLoader();
                Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
            }
            ContextImpl appContext = ContextImpl.createAppContext(mActivityThread, this);
            app = mActivityThread.mInstrumentation.newApplication(
                    cl, appClass, appContext);
            appContext.setOuterContext(app);
        } catch (Exception e) {
            if (!mActivityThread.mInstrumentation.onException(app, e)) {
                Trace.traceEnd(Trace.TRACE_TAG_ACTIVITY_MANAGER);
                throw new RuntimeException(
                    "Unable to instantiate application " + appClass
                    + ": " + e.toString(), e);
            }
        }
        mActivityThread.mAllApplications.add(app);
        mApplication = app; 
        //省略部分代码
    }

   //ContextWrapper.java
    @Override
    public Context getApplicationContext() {
        return mBase.getApplicationContext();
    }

    //ReceiverRestrictedContext.java
    @Override
    public Context getApplicationContext() {
        return (mPackageInfo != null) ?
                mPackageInfo.getApplication() : mMainThread.getApplication();
    }

    Application getApplication() {
        return mApplication;
    }

publicclassMyReceiverextendsBroadcastReceiver{

     @Override
     public void onReceive(Context context,Intent intent){
                       ApplicationmyApp=(Application)context.getApplicationContext();
     }
}

public abstract class Context {
    public abstract AssetManager getAssets();
    public abstract Resources getResources();
}

class ContextImpl extends Context {
     //省略部分代码
    private final @NonNull ResourcesManager mResourcesManager;
    private final @NonNull Resources mResources;
    @Override
    public AssetManager getAssets() {
        return getResources().getAssets();
    }
    @Override
    public Resources getResources() {
        return mResources;
    }
    //省略部分代码
}

    private ContextImpl(ContextImpl container, ActivityThread mainThread,
            LoadedApk packageInfo, IBinder activityToken, UserHandle user, int flags,
            Display display, Configuration overrideConfiguration, int createDisplayWithId) {
         //省略部分代码
        mResourcesManager = ResourcesManager.getInstance();
        //省略部分代码
        Resources resources = packageInfo.getResources(mainThread);
        if (resources != null) {
            if (displayId != Display.DEFAULT_DISPLAY
                    || overrideConfiguration != null
                    || (compatInfo != null && compatInfo.applicationScale
                            != resources.getCompatibilityInfo().applicationScale)) {

                if (container != null) {
                    // This is a nested Context, so it can't be a base Activity context.
                    // Just create a regular Resources object associated with the Activity.
                    resources = mResourcesManager.getResources(
                            activityToken,
                            packageInfo.getResDir(),
                            packageInfo.getSplitResDirs(),
                            packageInfo.getOverlayDirs(),
                            packageInfo.getApplicationInfo().sharedLibraryFiles,
                            displayId,
                            overrideConfiguration,
                            compatInfo,
                            packageInfo.getClassLoader());
                } else {
                    // This is not a nested Context, so it must be the root Activity context.
                    // All other nested Contexts will inherit the configuration set here.
                    resources = mResourcesManager.createBaseActivityResources(
                            activityToken,
                            packageInfo.getResDir(),
                            packageInfo.getSplitResDirs(),
                            packageInfo.getOverlayDirs(),
                            packageInfo.getApplicationInfo().sharedLibraryFiles,
                            displayId,
                            overrideConfiguration,
                            compatInfo,
                            packageInfo.getClassLoader());
                }
            }
        }
        mResources = resources;
        //省略部分代码
    }

public class InnerClass {
    private OuterClass outer;
    public InnerClass(OuterClass outer) {
        this.outer = outer;
    }
}

public class CustomerActivity {
    // 省略部分代码
void createHandler() {
    new Handler() {
        @Override public void handleMessage(Message message) {
            super.handleMessage(message);
        }
    }.postDelayed(new Runnable() {
        @Override public void run() {
            while(true);
        }
    }, 1000);
}

      View mBtn = findViewById(R.id.h_button);
      mBtn.setOnClickListener(new View.OnClickListener() {
               @Override 
               public void onClick(View v) {
                          createHandler();
                         nextActivity();
                }
         })；
      // 省略部分代码
}

//省略部分代码
void registerListener() {
       SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
       Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ALL);
       sensorManager.registerListener(this, sensor, SensorManager.SENSOR_DELAY_FASTEST);
}

View smButton = findViewById(R.id.sm_button);
smButton.setOnClickListener(new View.OnClickListener() {
    @Override public void onClick(View v) {
        registerListener();
        nextActivity();
    }
});
//省略部分代码