android中的SeekBar和媒体播放器 [英] SeekBar and media player in android
问题描述
我有一个简单的播放器和录音机.一切正常，但有一个问题.我想添加搜索栏以查看播放记录的进度并使用此搜索栏设置播放器应播放的位置.我有 onProgress 但没有效果.这是代码:
I have a simple player and recorder. Everything works great but have a one problem. I want to add seek bar to see progress in playing record and use this seek bar to set place from player should play. I have onProgress but with no effect. This is code:
package com.example.recorder;
import java.io.IOException;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
public class MainActivity extends Activity implements OnSeekBarChangeListener
{
private static final String LOG_TAG = "AudioRecordTest";
private static String mFileName = null;
private SeekBar seekBar;
private MediaRecorder mRecorder = null;
private Button startRecord, startPlaying, stopPlaying;
private MediaPlayer mPlayer = null;
private void onRecord(boolean start) {
if (start) {
startRecording();
} else {
stopRecording();
}
}
private void startPlaying() {
if(mPlayer != null && mPlayer.isPlaying()){
mPlayer.pause();
} else if(mPlayer != null){
mPlayer.start();
}else{
mPlayer = new MediaPlayer();
try {
mPlayer.setDataSource(mFileName);
mPlayer.prepare();
mPlayer.start();
} catch (IOException e) {
Log.e(LOG_TAG, "prepare() failed");
}
}
}
private void stopPlaying() {
mPlayer.release();
mPlayer = null;
startPlaying.setText("Start playing");
}
private void pausePlaying(){
if(mPlayer.isPlaying()){
mPlayer.pause();
} else {
mPlayer.start();
}
}
private void startRecording() {
mRecorder = new MediaRecorder();
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mRecorder.setOutputFile(mFileName);
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
try {
mRecorder.prepare();
} catch (IOException e) {
Log.e(LOG_TAG, "prepare() failed");
}
mRecorder.start();
}
private void stopRecording() {
mRecorder.stop();
mRecorder.release();
mRecorder = null;
}
public MainActivity() {
mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
mFileName += "/audiorecordtest.3gp";
}
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.activity_main);
startPlaying = (Button) findViewById(R.id.buttonStartPlay);
stopPlaying = (Button) findViewById(R.id.buttonStopPlaying);
startRecord = (Button) findViewById(R.id.buttonStartRecord);
seekBar = (SeekBar) findViewById(R.id.seekBar);
startRecord.setOnClickListener(new OnClickListener() {
boolean mStartRecording = true;
@Override
public void onClick(View v) {
onRecord(mStartRecording);
if (mStartRecording) {
startRecord.setText("Stop recording");
} else {
startRecord.setText("Start recording");
}
mStartRecording = !mStartRecording;
}
});
startPlaying.setOnClickListener(new OnClickListener() {
boolean mStartPlaying = true;
@Override
public void onClick(View v) {
//onPlay(mStartPlaying);
startPlaying();
if (mStartPlaying) {
startPlaying.setText("Stop playing");
} else {
startPlaying.setText("Start playing");
}
mStartPlaying = !mStartPlaying;
}
});
stopPlaying.setOnClickListener(new OnClickListener() {
boolean mStartPlaying = true;
@Override
public void onClick(View v) {
stopPlaying();
}
});
}
@Override
public void onPause() {
super.onPause();
if (mRecorder != null) {
mRecorder.release();
mRecorder = null;
}
if (mPlayer != null) {
mPlayer.release();
mPlayer = null;
}
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
if(fromUser){
mPlayer.seekTo(progress);
seekBar.setProgress(progress);
}
else{
// the event was fired from code and you shouldn't call player.seekTo()
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
}
任何想法应该如何使用搜索栏查看进度并从记录中设置位置?
Any ideas how use seek bar to see progress and set place from record should play?
推荐答案
要在 SeekBar 和 MediaPlayer 之间创建连接"，您首先需要获得当前录制的最大值持续时间并将其设置为您的搜索栏.
To create a 'connection' between SeekBar and MediaPlayer you need first to get your current recording max duration and set it to your seek bar.
mSeekBar.setMax(mFileDuration/1000); // where mFileDuration is mMediaPlayer.getDuration();
在您初始化 MediaPlayer 并例如按下播放按钮后，您应该创建处理程序和 post runnable，以便您可以更新您的 SeekBar(在 UI 线程中 本身)与您的 MediaPlayer 的当前位置，如下所示:
After you initialise your MediaPlayer and for example press play button, you should create handler and post runnable so you can update your SeekBar (in the UI thread itself) with the current position of your MediaPlayer like this :
private Handler mHandler = new Handler();
//Make sure you update Seekbar on UI thread
MainActivity.this.runOnUiThread(new Runnable() {
@Override
public void run() {
if(mMediaPlayer != null){
int mCurrentPosition = mMediaPlayer.getCurrentPosition() / 1000;
mSeekBar.setProgress(mCurrentPosition);
}
mHandler.postDelayed(this, 1000);
}
});
并每秒更新该值.
如果您需要在用户拖动 SeekBar 时更新 MediaPlayer 的位置，您应该将 OnSeekBarChangeListener 添加到您的 SeekBar 并在那里做:
If you need to update the MediaPlayer's position while user drag your SeekBar you should add OnSeekBarChangeListener to your SeekBar and do it there :
mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
if(mMediaPlayer != null && fromUser){
mMediaPlayer.seekTo(progress * 1000);
}
}
});
这应该可以解决问题！:)
And that should do the trick! : )
我在你的代码中注意到的一件事，不要做:
One thing which I've noticed in your code, don't do :
public MainActivity() {
mFileName = Environment.getExternalStorageDirectory().getAbsolutePath();
mFileName += "/audiorecordtest.3gp";
}
在 onCreate(); 中进行所有初始化，不要创建 Activity 的构造函数.
make all initialisations in your onCreate(); , do not create constructors of your Activity.
这篇关于android中的SeekBar和媒体播放器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
