[英]Android app to play mp3 file in specific time with countdown timer
我正在嘗試創建一個Android應用程序,該應用程序應該在幾分鍾內從搜索欄獲得時間,然后它應該開始播放聲音文件,直到倒數計時器結束。
倒數計時器幾乎沒什么問題,但我的問題是,當按下按鈕時,如何調用倒數計時器實例的某些方法。
在下面的代碼中,我想在按下停止按鈕時調用onFinish()。
這是我的代碼:
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SeekBar sb = (SeekBar) findViewById(R.id.seekBar);
Button bt_stop = (Button) findViewById(R.id.btn1);
final TextView tv = (TextView)findViewById(R.id.textView);
sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
int millisec_time = (i*60)/1000;
new CountDownTimer(millisec_time, 1000) {
public void onTick(long millisUntilFinished) {
tv.setText("seconds remaining: " + millisUntilFinished / 1000);
}
public void onFinish() {
tv.setText("done!");
}
}.start();
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// Toast.makeText(getApplicationContext(),"GOT",Toast.LENGTH_LONG).show();
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// Toast.makeText(getApplicationContext(),"OFF",Toast.LENGTH_LONG).show();
}
});
bt_stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
}
});
}
}
首先,我建議您僅在onStopTrackingTouch
啟動CountdownTimer
原因是當前onStopTrackingTouch
的進度發生變化時(可能會發生很多)您都在創建一個全新的計時器。
其次,您需要保留對計時器的引用才能將其取消。 所以:
public class MainActivity extends AppCompatActivity {
private CountdownTimer timer = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final SeekBar sb = (SeekBar) findViewById(R.id.seekBar);
sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
restartTimer(seekBar);
}
}
final Button bt_stop = (Button) findViewById(R.id.btn1);
bt_stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if(timer != null) {
timer.cancel();
}
}
});
}
private void restartTimer(SeekBar sb) {
if(timer!=null) {
timer.cancel();
}
final long millis = TimeUnit.SECONDS.toMillis(sb.getProgress());
final long interval = TimeUnit.SECONDS.toMillis(1);
timer = new CountdownTimer(millis, interval) {
@Override
public void onTick(long millisUntilFinished) {
tv.setText(String.format("Seconds Remaining: %d", TimeUnit.MILLIS.toSeconds(millisUntilFinished));
}
@Override
public void onFinish() {
tv.setText("done!");
}
}
timer.start();
}
}
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