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社区首页 >问答首页 >使用SharedPreferences保存int变量(不起作用)

问使用SharedPreferences保存int变量(不起作用)
EN

Stack Overflow用户
提问于 2015-05-03 14:44:05
回答 4查看 551关注 0票数 0

我创建了一个应用程序，点击一下按钮，它的整数值就会从0增加1。(它显示在一个textView中)我要做的是保存这个int变量，这样在重启应用程序后，修改后的值将保持不变。我试图使用这些方法，在onCreate中也将它们放在onClick(increase)方法中，但似乎都不起作用：

代码语言：javascript
运行
复制
SharedPreferences mPrefs = getSharedPreferences("label", 0);
Integer var = mPrefs.getInt("var", variable);

SharedPreferences.Editor mEditor = mPrefs.edit();
mEditor.putInt("tag", variable).commit();

还有这个：

代码语言：javascript
运行
复制
SharedPreferences sharedPref= getSharedPreferences("mypref", 0);
SharedPreferences.Editor editor= sharedPref.edit();
editor.putInt("name", variable);
editor.commit();

getSharedPreferences("name", variable);

退出并加载应用程序后，该值将重置为0

下面是完整的代码：

代码语言：javascript
运行
复制
import android.content.SharedPreferences;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;

public class TestApp extends ActionBarActivity {

    public int variable = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_app);

        TextView statnumber = (TextView) findViewById(R.id.number);
        statnumber.setText(String.valueOf(variable));

        SharedPreferences mPrefs = getSharedPreferences("var", 0);
        Integer var = mPrefs.getInt("var", variable);

        SharedPreferences.Editor mEditor = mPrefs.edit();
        mEditor.putInt("var", variable).commit();
    }

    public void increase(View view){
        TextView statnumber = (TextView) findViewById(R.id.number);
        statnumber.setText(String.valueOf(variable = variable + 1));
    }
}

下面是logcat所说的(可能不重要..)：

代码语言：javascript
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复制
05-02 22:23:53.010  10827-10827/com.rpd.testapp D/OpenGLRenderer﹕ Enabling debug mode 0
05-02 22:24:56.200  11058-11058/com.asd.testapp D/dalvikvm﹕ Late-enabling CheckJNI
05-02 22:24:56.440  11058-11058/com.asd.testapp D/ActivityThread﹕ setTargetHeapUtilization:0.25
05-02 22:24:56.450  11058-11058/com.asd.testapp D/ActivityThread﹕ setTargetHeapIdealFree:8388608
05-02 22:24:56.450  11058-11058/com.asd.testapp D/ActivityThread﹕ setTargetHeapConcurrentStart:2097152
05-02 22:24:56.730  11058-11058/com.asd.testapp I/dalvikvm﹕ Could not find method android.view.ViewGroup.onNestedScrollAccepted, referenced from method android.support.v7.internal.widget.ActionBarOverlayLayout.onNestedScrollAccepted
05-02 22:24:56.810  11058-11058/com.asd.testapp W/dalvikvm﹕ VFY: unable to resolve virtual method 12212: Landroid/view/ViewGroup;.onNestedScrollAccepted (Landroid/view/View;Landroid/view/View;I)V
05-02 22:24:56.810  11058-11058/com.asd.testapp D/dalvikvm﹕ VFY: replacing opcode 0x6f at 0x0000
05-02 22:24:56.810  11058-11058/com.asd.testapp I/dalvikvm﹕ Could not find method android.view.ViewGroup.onStopNestedScroll, referenced from method android.support.v7.internal.widget.ActionBarOverlayLayout.onStopNestedScroll
05-02 22:24:56.810  11058-11058/com.asd.testapp W/dalvikvm﹕ VFY: unable to resolve virtual method 12218: Landroid/view/ViewGroup;.onStopNestedScroll (Landroid/view/View;)V
05-02 22:24:56.810  11058-11058/com.asd.testapp D/dalvikvm﹕ VFY: replacing opcode 0x6f at 0x0000
05-02 22:24:56.810  11058-11058/com.asd.testapp I/dalvikvm﹕ Could not find method android.support.v7.internal.widget.ActionBarOverlayLayout.stopNestedScroll, referenced from method android.support.v7.internal.widget.ActionBarOverlayLayout.setHideOnContentScrollEnabled
05-02 22:24:56.810  11058-11058/com.asd.testapp W/dalvikvm﹕ VFY: unable to resolve virtual method 9783: Landroid/support/v7/internal/widget/ActionBarOverlayLayout;.stopNestedScroll ()V
05-02 22:24:56.810  11058-11058/com.asd.testapp D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x000e
05-02 22:24:56.900  11058-11058/com.asd.testapp I/dalvikvm﹕ Could not find method android.view.ViewGroup.onRtlPropertiesChanged, referenced from method android.support.v7.widget.Toolbar.onRtlPropertiesChanged
05-02 22:24:56.910  11058-11058/com.asd.testapp W/dalvikvm﹕ VFY: unable to resolve virtual method 12215: Landroid/view/ViewGroup;.onRtlPropertiesChanged (I)V
05-02 22:24:56.910  11058-11058/com.asd.testapp D/dalvikvm﹕ VFY: replacing opcode 0x6f at 0x0007
05-02 22:24:56.930  11058-11058/com.asd.testapp I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getChangingConfigurations, referenced from method android.support.v7.internal.widget.TintTypedArray.getChangingConfigurations
05-02 22:24:56.930  11058-11058/com.asd.testapp W/dalvikvm﹕ VFY: unable to resolve virtual method 396: Landroid/content/res/TypedArray;.getChangingConfigurations ()I
05-02 22:24:56.930  11058-11058/com.asd.testapp D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
05-02 22:24:56.930  11058-11058/com.asd.testapp I/dalvikvm﹕ Could not find method android.content.res.TypedArray.getType, referenced from method android.support.v7.internal.widget.TintTypedArray.getType
05-02 22:24:56.930  11058-11058/com.asd.testapp W/dalvikvm﹕ VFY: unable to resolve virtual method 418: Landroid/content/res/TypedArray;.getType (I)I
05-02 22:24:56.930  11058-11058/com.asd.testapp D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
05-02 22:24:56.930  11058-11058/com.asd.testapp I/dalvikvm﹕ Could not find method android.content.res.Resources.getDrawable, referenced from method android.support.v7.internal.widget.ResourcesWrapper.getDrawable
05-02 22:24:56.930  11058-11058/com.asd.testapp W/dalvikvm﹕ VFY: unable to resolve virtual method 359: Landroid/content/res/Resources;.getDrawable (ILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
05-02 22:24:56.930  11058-11058/com.asd.testapp D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
05-02 22:24:56.940  11058-11058/com.asd.testapp I/dalvikvm﹕ Could not find method android.content.res.Resources.getDrawableForDensity, referenced from method android.support.v7.internal.widget.ResourcesWrapper.getDrawableForDensity
05-02 22:24:56.940  11058-11058/com.asd.testapp W/dalvikvm﹕ VFY: unable to resolve virtual method 361: Landroid/content/res/Resources;.getDrawableForDensity (IILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
05-02 22:24:56.940  11058-11058/com.asd.testapp D/dalvikvm﹕ VFY: replacing opcode 0x6e at 0x0002
05-02 22:24:57.170  11058-11058/com.asd.testapp D/libEGL﹕ loaded /system/lib/egl/libEGL_adreno200.so
05-02 22:24:57.190  11058-11058/com.asd.testapp D/libEGL﹕ loaded /system/lib/egl/libGLESv1_CM_adreno200.so
05-02 22:24:57.190  11058-11058/com.asd.testapp D/libEGL﹕ loaded /system/lib/egl/libGLESv2_adreno200.so
05-02 22:24:57.200  11058-11058/com.asd.testapp I/Adreno200-EGL﹕ <qeglDrvAPI_eglInitialize:299>: EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_JB_REL_2.0.3.1_RB1.04.01.01.45.000_msm8625_JB_REL_2.0.3.1_Merge_release_AU (Merge)

这是我第一次创建一个创建缓存的应用程序，所以我不完全理解它是如何工作的。感谢您的帮助。

android
onclick
int
sharedpreferences
java
EN

回答 4

Stack Overflow用户

发布于 2015-05-03 14:57:45

在您的TestApp活动中，var总是返回0。下面是存储在MyPrefsFile文件key=silentMode中的所有值

如何从SharedPreferences获取值

代码语言：javascript
运行
复制
       public static final String PREFS_NAME = "MyPrefsFile";
       SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); //PREFS_NAME is file name not your key name
       boolean silent = settings.getBoolean("silentMode", false);
       setSilent(silent);

如何存储值

代码语言：javascript
运行
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      SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
      SharedPreferences.Editor editor = settings.edit();
      editor.putBoolean("silentMode", mSilentMode);

      // Commit the edits!
      editor.commit();

你真的需要访问Official Doc - Storage Options Shared Preferences

票数 0
EN

Stack Overflow用户

发布于 2015-05-03 15:09:10

我在onCreate内部看不到variable发生变化的任何地方。所以你存储了初始化后的值add - 0。这就是为什么你总是从首选项得到0的原因。

票数 0
EN

Stack Overflow用户

发布于 2015-05-03 16:52:09

试试这个编辑器SharedPreferences myPreference =getSharedPreferences("sharedpref_name"，MODE_PRIVATE)；//将数据写入编辑器编辑器= myPreference.edit()；editor.putString("var_name"，"variable_value")；editor.commit()；

票数 0
EN
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：

https://stackoverflow.com/questions/30011027

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