共享首选项未保存android App的确切实例状态

Question

我正在使用Java创建一个简单的Click Counter Android应用。 我是Java新手。 我试图保存退出应用程序时的计数，无论是按下后退按钮还是关闭或崩溃，等等。这是到目前为止的代码：

public class wazeefa extends Activity  {

//Count Button  
TextView txtCount;
Button btnCount;
int count; 
Button wmute;
Button wreset;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.wazeefa);

    //SAVE COUNT
    SharedPreferences app_preferences = 
       PreferenceManager.getDefaultSharedPreferences(this);

    count = app_preferences.getInt("count", 0);

    txtCount = (TextView)findViewById(R.id.wcount);
    txtCount.setText("This app has been started " + count + " times.");

    SharedPreferences.Editor editor = app_preferences.edit();
    editor.putInt("count", ++count);
    editor.commit();

    //Button SOUND AND COUNT
    final MediaPlayer mpButtonClick = MediaPlayer.create(this, R.raw.bubble);

    txtCount = (TextView)findViewById(R.id.wcount); 
    txtCount.setText(String.valueOf(count));
    btnCount = (Button)findViewById(R.id.wclick);   

    btnCount.setOnClickListener(new OnClickListener() {
        public void onClick(View V) {
        final ImageView image = (ImageView) findViewById(R.id.imageview);
           count++; 
           if (count > 50) count = 0; image.setImageResource(R.drawable.duroodimage);
           if (count > 0) image.setImageResource(R.drawable.duroodimage);
           if (count > 9) image.setImageResource(R.drawable.zikrimage); 
           if (count > 39) image.setImageResource(R.drawable.duroodimage);
           txtCount.setText(String.valueOf(count));
           mpButtonClick.start(); 

    //RESET Button
    wreset = (Button)findViewById(R.id.wreset);       
    wreset.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            count = 0; 
            image.setImageResource(R.drawable.duroodimage);;
               txtCount.setText("0");


    }

我的应用程式有2个问题。

首先，计数没有保存到关闭应用程序然后再次打开时的状态。 例如，如果计数为“ 20”，而我按下“后退”按钮，则返回同一页面，计数将显示为“ 3”。 -有趣的是，每当我尝试上述操作并在单击“后退”按钮后又返回到应用程序时，计数都增加了1。

第二个问题是，当我返回应用程序并且计数显示为“ 5”时，例如，“重置”按钮不再起作用-它什么也不做。 但是，当我继续计数然后单击“重置”按钮时，它将计数再次更改为零。

请谁能协助解决以上两个问题？

建议后的新规范：

public class wazeefa extends Activity  {

//Count Button  
TextView txtCount;
Button btnCount;
Button wmute;
Button wreset;
public static int count=0;
SharedPreferences app_preferences;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.wazeefa);

    //SAVE COUNT
    SharedPreferences app_preferences = 
            PreferenceManager.getDefaultSharedPreferences(this);

    count = app_preferences.getInt("count", 0);

    txtCount = (TextView)findViewById(R.id.wcount);
    txtCount.setText("This app has been started " + count + " times.");}

protected void onPause() {
     super.onPause();

    // save count value here
   SharedPreferences.Editor editor = app_preferences.edit();
   editor.putInt("count", count);
   editor.commit();

    //SOUND and COUNT
    final MediaPlayer mpButtonClick = MediaPlayer.create(this, R.raw.bubble);

    txtCount = (TextView)findViewById(R.id.wcount); 
    txtCount.setText(String.valueOf(count));
    btnCount = (Button)findViewById(R.id.wclick);   

    btnCount.setOnClickListener(new OnClickListener() {
        public void onClick(View V) {
        final ImageView image = (ImageView) findViewById(R.id.imageview);
           count++; 
           if (count > 50) count = 0; image.setImageResource(R.drawable.duroodimage);
           if (count > 0) image.setImageResource(R.drawable.duroodimage);
           if (count > 9) image.setImageResource(R.drawable.zikrimage); 
           if (count > 39) image.setImageResource(R.drawable.duroodimage);
           txtCount.setText(String.valueOf(count));
           mpButtonClick.start(); 

    //RESET Button
    wreset = (Button)findViewById(R.id.wreset);       
    wreset.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            count = 0; 
            image.setImageResource(R.drawable.duroodimage);;
               txtCount.setText("0");


    }

我的代码的最后一部分：

 protected void onPause() {
         super.onPause();

    // save count value here

      SharedPreferences.Editor editor = app_preferences.edit();
      editor.putInt("count", count);
      editor.commit();


         };
     });
      }});
  };}

Answer 1

在班级声明为静态：

public static int count=0;
SharedPreferences app_preferences ;

并使用onPause将SharedPreferences计数值保存为：

 protected void onPause() {
     super.onPause();

    // save count value here
   SharedPreferences.Editor editor = app_preferences.edit();
   editor.putInt("count", count);
   editor.commit();
 }

Answer 2

如果您希望将其保存在出口处，请将此代码发布到onDestroy（）中，而不是onCreate（）中

SharedPreferences.Editor editor = app_preferences.edit();
editor.putInt("count", ++count);
editor.commit();