我在 Activity 中定义了一个 PhoneStateListener,我想在更改 Activity 时停止监听器。我已尝试使用此代码来完成此操作,但它不起作用。
public class OriginActivity extends AppCompatActivity{
private TelephonyManager tManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_origin);
tManager = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
tManager.listen(new CustomPhoneStateListener(this), PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);
}
protected void onPause() {
super.onPause();
// Logs 'app deactivate' App Event.
AppEventsLogger.deactivateApp(this);
tManager.listen(new CustomPhoneStateListener(this), PhoneStateListener.LISTEN_NONE);
}
}
我做错了什么?
最佳答案
我找到了解决办法!!!
public class OriginActivity extends AppCompatActivity{
CustomPhoneStateListener customPhoneStateListener;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_origin);
/**** Other Code ****/
}
protected void onResume() {
super.onResume();
//Here, we start the listener!!!
TelephonyManager tManager = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
customPhoneStateListener = new CustomPhoneStateListener(this);
tManager.listen(customPhoneStateListener, PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);
Log.d(TAG, "onResume");
}
protected void onPause() {
super.onPause();
//Here, we stop the listener!!!
TelephonyManager tManager = (TelephonyManager)getSystemService(TELEPHONY_SERVICE);
tManager.listen(customPhoneStateListener, PhoneStateListener.LISTEN_NONE);
customPhoneStateListener = null;
}
}
因此,当我们第一次访问 Activity 或从另一个 Activity 返回时,我们调用 onResume() 并启动监听器。而且,当我们使用 onPause() 退出 Activity 时,我们会停止监听器。
关于java - 更改 Activity 时如何停止 PhoneStateListener,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31559867/