android - Android countDownTimer 只工作一次
问题描述
我是安卓工作室的新手。我正在尝试制作一个录音机应用程序,一旦单击录音按钮,它就可以自动录音 10 秒。我使用倒数计时器做到了这一点。但是,倒数计时器仅在第一次工作。当我第二次尝试录制时,录音机不会自动停止。我似乎找不到问题。
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.CountDownTimer;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import java.io.IOException;
import java.util.Random;
import static android.Manifest.permission.RECORD_AUDIO;
import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;
import android.support.v4.app.ActivityCompat;
import android.content.pm.PackageManager;
import android.support.v4.content.ContextCompat;
public class MainActivity extends AppCompatActivity {
Button buttonStart, buttonPlayLastRecordAudio ;
String AudioSavePathInDevice = null;
MediaRecorder mediaRecorder ;
Random random ;
String RandomAudioFileName = "ABCDEFGHIJKLMNOP";
public static final int RequestPermissionCode = 1;
MediaPlayer mediaPlayer ;
CountDownTimer countDownTimer;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
buttonStart = (Button) findViewById(R.id.button);
buttonPlayLastRecordAudio = (Button) findViewById(R.id.button3);
buttonPlayLastRecordAudio.setEnabled(false);
random = new Random();
buttonStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (checkPermission()) {
AudioSavePathInDevice =
Environment.getExternalStorageDirectory().getAbsolutePath() + "/" +
CreateRandomAudioFileName(5) + "AudioRecording.3gp";
MediaRecorderReady();
try {
mediaRecorder.prepare();
mediaRecorder.start();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
buttonStart.setEnabled(true);
buttonPlayLastRecordAudio.setEnabled(true);
Toast.makeText(MainActivity.this, "Recording started",
Toast.LENGTH_LONG).show();
} else {
requestPermission();
}
}
});
buttonPlayLastRecordAudio.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) throws IllegalArgumentException,
SecurityException, IllegalStateException {
mediaPlayer = new MediaPlayer();
try {
mediaPlayer.setDataSource(AudioSavePathInDevice);
mediaPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.start();
Toast.makeText(MainActivity.this, "Recording Playing",
Toast.LENGTH_LONG).show();
}
});
CountDownTimer countDowntimer = new CountDownTimer(5000, 10000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
Toast.makeText(MainActivity.this, "Stop recording Automatically ", Toast.LENGTH_LONG).show();
mediaRecorder.stop();
buttonStart.setEnabled(true);
}
};countDowntimer.start();
}
public void MediaRecorderReady(){
mediaRecorder=new MediaRecorder();
mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mediaRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
mediaRecorder.setOutputFile(AudioSavePathInDevice);
}
public String CreateRandomAudioFileName(int string){
StringBuilder stringBuilder = new StringBuilder( string );
int i = 0 ;
while(i < string ) {
stringBuilder.append(RandomAudioFileName.
charAt(random.nextInt(RandomAudioFileName.length())));
i++ ;
}
return stringBuilder.toString();
}
private void requestPermission() {
ActivityCompat.requestPermissions(MainActivity.this, new
String[]{WRITE_EXTERNAL_STORAGE, RECORD_AUDIO}, RequestPermissionCode);
}
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case RequestPermissionCode:
if (grantResults.length> 0) {
boolean StoragePermission = grantResults[0] ==
PackageManager.PERMISSION_GRANTED;
boolean RecordPermission = grantResults[1] ==
PackageManager.PERMISSION_GRANTED;
if (StoragePermission && RecordPermission) {
Toast.makeText(MainActivity.this, "Permission Granted",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(MainActivity.this,"Permission Denied",Toast.LENGTH_LONG).show();
}
}
break;
}
}
public boolean checkPermission() {
int result = ContextCompat.checkSelfPermission(getApplicationContext(),
WRITE_EXTERNAL_STORAGE);
int result1 = ContextCompat.checkSelfPermission(getApplicationContext(),
RECORD_AUDIO);
return result == PackageManager.PERMISSION_GRANTED &&
result1 == PackageManager.PERMISSION_GRANTED;
}
}
解决方案
你正在把countDowntimer
inonCreate()
方法,你需要把它放在onClick
里面buttonStart
buttonStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (checkPermission()) {
AudioSavePathInDevice =
Environment.getExternalStorageDirectory().getAbsolutePath() + "/" +
CreateRandomAudioFileName(5) + "AudioRecording.3gp";
MediaRecorderReady();
try {
mediaRecorder.prepare();
mediaRecorder.start();
} catch (IllegalStateException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
buttonStart.setEnabled(true);
buttonPlayLastRecordAudio.setEnabled(true);
CountDownTimer countDowntimer = new CountDownTimer(5000, 10000) {
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
Toast.makeText(MainActivity.this, "Stop recording Automatically ", Toast.LENGTH_LONG).show();
mediaRecorder.stop();
buttonStart.setEnabled(true);
}
};
countDowntimer.start();
Toast.makeText(MainActivity.this, "Recording started",
Toast.LENGTH_LONG).show();
} else {
requestPermission();
}
}
});
当然,去掉你的外在countDowntimer
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