我的應用程序只能在仿真器上運行，而不能在真實設備上運行

我在仿真器上測試我的應用程序並且工作正常。當我在真實設備上啓動它時，它不起作用（組件正常加載）。它只包含一個文本區域，只要按下「1」，就應該在上面寫上「Hello，world」。我使用：我的應用程序只能在仿真器上運行，而不能在真實設備上運行

import android.media.MediaPlayer; 
import android.support.v7.app.ActionBarActivity; 
import android.os.Bundle; 

import android.view.KeyEvent; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.EditText; 

public class MainActivity extends ActionBarActivity { 
String current_string; 
int length; 
EditText et; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    et = (EditText) findViewById(R.id.editText); 

    et.setOnKeyListener(new View.OnKeyListener() { 
     public boolean onKey(View v, int keyCode, KeyEvent event) { 
      if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_1)) { 
       et.setText("Hello, world!"); 
       current_string = et.getText().toString(); 
       length = current_string.length(); 
       et.setSelection(length); 
       return true; 
      } 
      return false; 
     } 
    }); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 

    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.main, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 
    if (id == R.id.action_settings) { 
     return true; 
    } 
    return super.onOptionsItemSelected(item); 
}

}

和XML我使用：

<application 
    android:allowBackup="true" 
    android:icon="@drawable/ic_launcher" 
    android:label="@string/app_name" 
    android:theme="@style/AppTheme" > 
    <activity 
     android:name="com.testingname.testapp.app.MainActivity" 
     android:label="@string/app_name" > 
     <intent-filter> 
      <action android:name="android.intent.action.MAIN" /> 

      <category android:name="android.intent.category.LAUNCHER" /> 
     </intent-filter> 
    </activity> 
</application>

來源

2014-06-05 Giannis Thanasiou