Question

我在3秒后安排了一个电话，如果该活动关闭（用户移动到另一个活动），我想取消它。
这是我的java文件：

public class EmargencyResponseActivity extends AppCompatActivity {


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_emergency_response);


    if (ActivityCompat.checkSelfPermission(EmargencyResponseActivity.this,
            Manifest.permission.CALL_PHONE) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(EmargencyResponseActivity.this,new String[]{Manifest.permission.CALL_PHONE},1);


    }
    new CountDownTimer(3000, 1000) {
        public void onFinish() {
            Intent startEmergency = new Intent(Intent.ACTION_CALL, Uri.parse("tel:108"));
            startActivity(startEmergency);
                finish();
            }

        public void onTick(long millisUntilFinished) {
        }
    }.start();}}

Answer 1

您可以在活动中保留对计时器的引用，并在onPause

期间取消它

public class EmargencyResponseActivity extends AppCompatActivity {

CountDownTimer timer;

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

    //...

    }
    timer = new CountDownTimer(3000, 1000) {
        //Implementation
    }
}

@Override
protected void onPause(){
    if (timer != null) timer.cancel();
}

}

该活动结束后如何取消预定的通话？

1 个答案: