我有一个runnable，它启动一个活动和一个处理程序，让5n秒后可运行的重复。但是，我实现了一个“停止按钮”，它应该停止该处理程序，但不知何故它不起作用。 我会感谢一些帮助，为什么它不会停止循环。
public class MainActivity extends Activity {
private Button callBtn;
private Button stopBtn;
Handler handler = new Handler();
Runnable redial=new Runnable(){
@Override public void run(){Intent callIntent=new Intent(Intent.ACTION_CALL,Uri.parse("tel:+49888888"));startActivity(callIntent);
}};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
callBtn = (Button) findViewById(R.id.call);
stopBtn = (Button) findViewById(R.id.stop);
// add PhoneStateListener for monitoring
MyPhoneListener phoneListener = new MyPhoneListener();
TelephonyManager telephonyManager = (TelephonyManager) this.getSystemService(Context.TELEPHONY_SERVICE);
// receive notifications of telephony state changes
telephonyManager.listen(phoneListener, PhoneStateListener.LISTEN_CALL_STATE);
callBtn.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
redial.run();
}
});
stopBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
handler.removeCallbacks(redial);
}
});
}
private class MyPhoneListener extends PhoneStateListener {
private boolean onCall = false;
public void onCallStateChanged(int state, String incomingNumber) {
switch (state) {
case TelephonyManager.CALL_STATE_RINGING:
// phone ringing...
Toast.makeText(MainActivity.this, incomingNumber + " calls you",
Toast.LENGTH_LONG).show();
break;
case TelephonyManager.CALL_STATE_OFFHOOK:
// one call exists that is dialing, active, or on hold
Toast.makeText(MainActivity.this, "on call...",
Toast.LENGTH_LONG).show();
//because user answers the incoming call
onCall = true;
break;
case TelephonyManager.CALL_STATE_IDLE:
// in initialization of the class and at the end of phone call
// detect flag from CALL_STATE_OFFHOOK
if (onCall == true) {
Toast.makeText(MainActivity.this, "restart app after call",
Toast.LENGTH_LONG).show();
// restart our application
Intent restart = getBaseContext().getPackageManager().
getLaunchIntentForPackage(getBaseContext().getPackageName());
restart.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(restart);
onCall = false;
handler.postDelayed(redial, 5000);
}
break;
default:
break;
}
}
}