如何在意图之间传递布尔值

Question

当按下后退按钮时,我需要将布尔值传递给intent,然后再返回intent.目标是设置布尔值并使用条件来防止在检测到onShake事件时多次启动新意图.我会使用SharedPreferences,但似乎它与我的onClick代码不相配,我不知道如何解决这个问题.任何建议,将不胜感激!

public class MyApp extends Activity {

private SensorManager mSensorManager;
private ShakeEventListener mSensorListener;


/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    mSensorListener = new ShakeEventListener();
    mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    mSensorManager.registerListener(mSensorListener,
        mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
        SensorManager.SENSOR_DELAY_UI);


    mSensorListener.setOnShakeListener(new ShakeEventListener.OnShakeListener() {

      public void onShake() {
             // This code is launched multiple times on a vigorous
             // shake of the device.  I need to prevent this.
            Intent myIntent = new Intent(MyApp.this, NextActivity.class);
            MyApp.this.startActivity(myIntent);
      }
    });

}

@Override
protected void onResume() {
  super.onResume();
  mSensorManager.registerListener(mSensorListener,mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
      SensorManager.SENSOR_DELAY_UI);
}

@Override
protected void onStop() {
  mSensorManager.unregisterListener(mSensorListener);
  super.onStop();
}}

Answer 1

设置intent额外(使用putExtra):

Intent intent = new Intent(this, NextActivity.class);
intent.putExtra("yourBoolName", true);

检索额外意图:

@Override
protected void onCreate(Bundle savedInstanceState) {
    Boolean yourBool = getIntent().getExtras().getBoolean("yourBoolName");
}

Answer 2

在您的活动中有一个名为wasShaken的私有成员变量.

private boolean wasShaken = false;

修改你的onResume以将其设置为false.

public void onResume() { wasShaken = false; }

在你的onShake监听器中,检查它是否属实.如果是的话,早点回来.然后将其设置为true.

  public void onShake() {
              if(wasShaken) return;
              wasShaken = true;
                          // This code is launched multiple times on a vigorous
                          // shake of the device.  I need to prevent this.
              Intent myIntent = new Intent(MyApp.this, NextActivity.class);
              MyApp.this.startActivity(myIntent);
  }
});