如何在觸摸屏關閉後禁用活動的新實施？

Question

如何在觸摸屏關閉後禁用某項活動的新實施？

注意：設備未關閉，但觸摸屏已關閉。

例如，請參見下面的代碼，當我們點擊imageView對象上，在任何時間，增加1單元到textView對象的值。如果我們在imageView對象上單擊十次，則textView對象將具有10值。現在如果我不點擊觸摸屏，結果觸摸屏將關閉。現在，當我想打開觸摸屏時，textView對象值爲0。雖然它應該仍然具有相同的10值。

public class MainActivity extends Activity { 

    ImageView imageView; 
    Integer integer = 0; 
    TextView textView; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.activity_main); 
     imageView = (ImageView) findViewById(R.id.imageView); 
     textView = (TextView) findViewById(R.id.textView); 
     textView.setText(integer.toString()); 
     imageView.setOnClickListener(new View.OnClickListener() {@Override 
      public void onClick(View v) { 
       integer = integer + 1; 
       textView.setText(integer.toString()); 
      } 
     }); 
    } 

} 

Answer 1

你必須使用到的onSaveInstanceState保存狀態

public class MainActivity extends Activity { 

    ImageView imageView; 
    Integer integer = 0; 
    TextView textView; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.activity_main); 
     imageView = (ImageView) findViewById(R.id.imageView); 
     textView = (TextView) findViewById(R.id.textView); 
     if (savedInstanceState!=null) { 
      integer = savedInstanceState.getInt("count"); 
     } 
     textView.setText(integer.toString()); 
     imageView.setOnClickListener(new View.OnClickListener() {@Override 
      public void onClick(View v) { 
       integer = integer + 1; 
       textView.setText(integer.toString()); 
      } 
     }); 
    } 

    @Override 
    protected void onSaveInstanceState(Bundle outState) { 
     super.onSaveInstanceState(outState); 
     outState.putInt("count", integer); 
    } 

} 

http://developer.android.com/training/basics/activity-lifecycle/recreating.html#SaveState