如何在特定条件下停止可运行计时器?
我想制作一个定时器应用程序,在特定的时间过后发出警报。我是Android开发新手,所以我拿起了一个来自互联网的示例计时器代码,并试图根据我的需要对其进行修改。如何在特定条件下停止可运行计时器?
我已经完成了1分钟过后定时器发出警报的部分,但警报声并未停止,我该怎么做。下面
我的代码给出:
package com.example.aditya.timerapp;
import android.media.Ringtone;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.common.api.GoogleApiClient;
public class MainActivity extends AppCompatActivity {
private ProgressBar progress;
private TextView timerValue;
private long startTime = 0L;
private Handler customHandler = new Handler();
long timeInMilliseconds = 0L;
long timeSwapBuff = 0L;
long updatedTime = 0L;
int progressStatus = 0;
private boolean stopped = false;
@Override
public void onCreate(Bundle savedInstanceState) {
//final CountDown timer = new CountDown();
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
timerValue = (TextView) findViewById(R.id.timerVal);
Button startButton = (Button) findViewById(R.id.startButton);
startButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
//timer.start();
startTime = SystemClock.uptimeMillis();
customHandler.postDelayed(updateTimerThread, 0);
}
});
Button pauseButton = (Button) findViewById(R.id.stopButton);
pauseButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
/*try {
timer.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}*/
timeSwapBuff += timeInMilliseconds;
customHandler.removeCallbacks(updateTimerThread);
}
});
Button resetButton = (Button) findViewById(R.id.resetButton);
resetButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
//timeSwapBuff += timeInMilliseconds;
timeInMilliseconds = 0L;
timeSwapBuff = 0L;
updatedTime = 0L;
int secs = (int) (updatedTime/1000);
int mins = secs/60;
secs = secs % 60;
int milliseconds = (int) (updatedTime % 1000);
timerValue.setText("" + mins + ":"
+ String.format("%02d", secs) + ":"
+ String.format("%03d", milliseconds));
customHandler.removeCallbacks(updateTimerThread);
onStop();
}
});
progress = (ProgressBar) findViewById(R.id.progressBar);
}
/*public void stopRun() {
//if (updatedTime == 0) {
//Toast.makeText(new MainActivity(), "StopRun",Toast.LENGTH_LONG).show();
timeSwapBuff = 0;
timerValue.setText("00:00:000");
//updateTimerThread.
customHandler.removeCallbacks(updateTimerThread);
//}
}*/
private Runnable updateTimerThread = new Runnable() {
@Override
public void run() {
//long totalMilliseconds = 1500000;
//while (!stopped){
//long totalMilliseconds = 15000;
//updatedTime = totalMilliseconds - SystemClock.currentThreadTimeMillis();
timeInMilliseconds = SystemClock.uptimeMillis() - startTime;
updatedTime = timeSwapBuff + timeInMilliseconds;
int secs = (int) (updatedTime/1000);
int mins = secs/60;
secs = secs % 60;
int milliseconds = (int) (updatedTime % 1000);
timerValue.setText("" + mins + ":"
+ String.format("%02d", secs) + ":"
+ String.format("%03d", milliseconds));
customHandler.postDelayed(this, 0);
if (mins == 1 && secs == 0) {
playTimer();
}
}
};
public ProgressBar getProgress() {
return progress;
}
public void setProgress(ProgressBar progress) {
this.progress = progress;
}
public void playTimer(){
Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM);
Ringtone ring = RingtoneManager.getRingtone(getApplicationContext(), notification);
ring.play();
timeSwapBuff += timeInMilliseconds;
customHandler.removeCallbacks(updateTimerThread);
}
protected void onStop() {
customHandler.removeCallbacks(updateTimerThread);
super.onStop();
}
}
所以现在我需要一种方法,当用户按下复位键停止报警。请建议。
如果我理解了正确的问题,您可以尝试通过在onStop()
方法中声明private Ringtone ring
和拨打ring.stop()
方法来停止警报声。
private Ringtone ring; //...// public void playTimer(){ Uri notification = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_ALARM); ring = RingtoneManager.getRingtone(getApplicationContext(), notification); ring.play(); timeSwapBuff += timeInMilliseconds; customHandler.removeCallbacks(updateTimerThread); } protected void onStop() { customHandler.removeCallbacks(updateTimerThread); ring.stop(); super.onStop(); }
一种方式做到这一点如下:
定义您
Runnable
内布尔和run()
做任何事情之前检查。使用
Runnable
中的方法翻转它。
这里是代码片段:
private Runnable updateTimerThread = new Runnable() {
private volatile boolean flag = true;
public void stopTimer() {
this.flag = false;
}
@Override
public void run() {
while(flag) {
//long totalMilliseconds = 1500000;
//while (!stopped){
//long totalMilliseconds = 15000;
//updatedTime = totalMilliseconds - SystemClock.currentThreadTimeMillis();
timeInMilliseconds = SystemClock.uptimeMillis() - startTime;
updatedTime = timeSwapBuff + timeInMilliseconds;
int secs = (int) (updatedTime/1000);
int mins = secs/60;
secs = secs % 60;
int milliseconds = (int) (updatedTime % 1000);
timerValue.setText("" + mins + ":"
+ String.format("%02d", secs) + ":"
+ String.format("%03d", milliseconds));
customHandler.postDelayed(this, 0);
if (mins == 1 && secs == 0) {
playTimer();
}
}
}
};
现在,你只需要调用stopTimer()
停止Runnable
。
另一种方法是处理Runnable
中的InterruptedException
并从主程序发送一个中断。