在android中将Activity对象传递给非Activity类

// 定义接口
public interface ActivityCallback {
    void onActivityMethod();
}

// 在Activity中实现接口
public class MainActivity extends AppCompatActivity implements ActivityCallback {
    private NonActivityClass nonActivityClass;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        nonActivityClass = new NonActivityClass();
        nonActivityClass.setActivityCallback(this);
    }

    @Override
    public void onActivityMethod() {
        // 在非Activity类中调用Activity的方法
    }
}

// 非Activity类中使用接口回调
public class NonActivityClass {
    private ActivityCallback activityCallback;

    public void setActivityCallback(ActivityCallback callback) {
        this.activityCallback = callback;
    }

    public void someMethod() {
        if (activityCallback != null) {
            activityCallback.onActivityMethod();
        }
    }
}

public class NonActivityClass {
    private Activity activity;

    public NonActivityClass(Activity activity) {
        this.activity = activity;
    }

    public void someMethod() {
        // 使用Activity对象
    }
}

// 在Activity中实例化非Activity类并传递Activity对象
public class MainActivity extends AppCompatActivity {
    private NonActivityClass nonActivityClass;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        nonActivityClass = new NonActivityClass(this);
        nonActivityClass.someMethod();
    }
}

public class NonActivityClass {
    private static Activity activity;

    public static void setActivity(Activity activity) {
        NonActivityClass.activity = activity;
    }

    public static void someMethod() {
        // 使用Activity对象
    }
}

// 在Activity中将当前Activity对象赋值给静态变量
public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        NonActivityClass.setActivity(this);
        NonActivityClass.someMethod();
    }
}