Modify AndroidPlayerActivity.java from last exercise "Display playing time for MediaPlayer", implement OnSeekBarChangeListener of the SeekBar timeLine, and cmdSeekTo() method to call mediaPlayer.seekTo()
package com.exercise.AndroidPlayer;
import java.io.IOException;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import android.app.Activity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnErrorListener;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
import android.widget.Toast;
public class AndroidPlayerActivity extends Activity {
TextView info, state;
Button buttonOpen;
Button buttonPlay, buttonPause, buttonStop;
SeekBar timeLine;
LinearLayout timeFrame;
TextView timePos, timeDur;
final static int RQS_OPEN_AUDIO_MP3 = 1;
MediaPlayer mediaPlayer;
String srcPath = null;
enum MP_State {
Idle, Initialized, Prepared, Started, Paused,
Stopped, PlaybackCompleted, End, Error, Preparing}
MP_State mediaPlayerState;
//ScheduledExecutorService myScheduledExecutorService;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
buttonOpen = (Button)findViewById(R.id.open);
buttonOpen.setOnClickListener(buttonOpenOnClickListener);
info = (TextView)findViewById(R.id.info);
state = (TextView)findViewById(R.id.state);
buttonPlay = (Button)findViewById(R.id.play);
buttonPlay.setOnClickListener(buttonPlayOnClickListener);
buttonPause = (Button)findViewById(R.id.pause);
buttonPause.setOnClickListener(buttonPauseOnClickListener);
buttonStop = (Button)findViewById(R.id.stop);
buttonStop.setOnClickListener(buttonStopOnClickListener);
//
timeLine = (SeekBar)findViewById(R.id.seekbartimeline);
timeFrame = (LinearLayout)findViewById(R.id.timeframe);
timePos = (TextView)findViewById(R.id.pos);
timeDur = (TextView)findViewById(R.id.dur);
ScheduledExecutorService myScheduledExecutorService = Executors.newScheduledThreadPool(1);
myScheduledExecutorService.scheduleWithFixedDelay(
new Runnable(){
@Override
public void run() {
monitorHandler.sendMessage(monitorHandler.obtainMessage());
}},
200, //initialDelay
200, //delay
TimeUnit.MILLISECONDS);
timeLine.setOnSeekBarChangeListener(timeLineChangeListener);
}
OnSeekBarChangeListener timeLineChangeListener
= new OnSeekBarChangeListener(){
@Override
public void onProgressChanged(SeekBar seekbar, int progress, boolean fromUser) {
if(fromUser){
cmdSeekTo(progress);
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}};
Handler monitorHandler = new Handler(){
@Override
public void handleMessage(Message msg) {
mediaPlayerMonitor();
}
};
private void mediaPlayerMonitor(){
if (mediaPlayer == null){
timeLine.setVisibility(View.INVISIBLE);
timeFrame.setVisibility(View.INVISIBLE);
}else{
if(mediaPlayer.isPlaying()){
timeLine.setVisibility(View.VISIBLE);
timeFrame.setVisibility(View.VISIBLE);
int mediaDuration = mediaPlayer.getDuration();
int mediaPosition = mediaPlayer.getCurrentPosition();
timeLine.setMax(mediaDuration);
timeLine.setProgress(mediaPosition);
timePos.setText(String.valueOf((float)mediaPosition/1000) + "s");
timeDur.setText(String.valueOf((float)mediaDuration/1000) + "s");
}else{
timeLine.setVisibility(View.INVISIBLE);
timeFrame.setVisibility(View.INVISIBLE);
}
}
}
OnErrorListener mediaPlayerOnErrorListener
= new OnErrorListener(){
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
// TODO Auto-generated method stub
mediaPlayerState = MP_State.Error;
showMediaPlayerState();
return false;
}};
private void cmdReset(){
if (mediaPlayer == null){
mediaPlayer = new MediaPlayer();
mediaPlayer.setOnErrorListener(mediaPlayerOnErrorListener);
}
mediaPlayer.reset();
mediaPlayerState = MP_State.Idle;
showMediaPlayerState();
}
private void cmdSetDataSource(String path){
if(mediaPlayerState == MP_State.Idle){
try {
mediaPlayer.setDataSource(path);
mediaPlayerState = MP_State.Initialized;
} catch (IllegalArgumentException e) {
Toast.makeText(AndroidPlayerActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
e.printStackTrace();
} catch (IllegalStateException e) {
Toast.makeText(AndroidPlayerActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
e.printStackTrace();
} catch (IOException e) {
Toast.makeText(AndroidPlayerActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}else{
Toast.makeText(AndroidPlayerActivity.this,
"Invalid State@cmdSetDataSource - skip",
Toast.LENGTH_LONG).show();
}
showMediaPlayerState();
}
private void cmdPrepare(){
if(mediaPlayerState == MP_State.Initialized
||mediaPlayerState == MP_State.Stopped){
try {
mediaPlayer.prepare();
mediaPlayerState = MP_State.Prepared;
} catch (IllegalStateException e) {
Toast.makeText(AndroidPlayerActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
e.printStackTrace();
} catch (IOException e) {
Toast.makeText(AndroidPlayerActivity.this,
e.toString(), Toast.LENGTH_LONG).show();
e.printStackTrace();
}
}else{
Toast.makeText(AndroidPlayerActivity.this,
"Invalid State@cmdPrepare() - skip",
Toast.LENGTH_LONG).show();
}
showMediaPlayerState();
}
private void cmdStart(){
if(mediaPlayerState == MP_State.Prepared
||mediaPlayerState == MP_State.Started
||mediaPlayerState == MP_State.Paused
||mediaPlayerState == MP_State.PlaybackCompleted){
mediaPlayer.start();
mediaPlayerState = MP_State.Started;
}else{
Toast.makeText(AndroidPlayerActivity.this,
"Invalid State@cmdStart() - skip",
Toast.LENGTH_LONG).show();
}
showMediaPlayerState();
}
private void cmdPause(){
if(mediaPlayerState == MP_State.Started
||mediaPlayerState == MP_State.Paused){
mediaPlayer.pause();
mediaPlayerState = MP_State.Paused;
}else{
Toast.makeText(AndroidPlayerActivity.this,
"Invalid State@cmdPause() - skip",
Toast.LENGTH_LONG).show();
}
showMediaPlayerState();
}
private void cmdStop(){
if(mediaPlayerState == MP_State.Prepared
||mediaPlayerState == MP_State.Started
||mediaPlayerState == MP_State.Stopped
||mediaPlayerState == MP_State.Paused
||mediaPlayerState == MP_State.PlaybackCompleted){
mediaPlayer.stop();
mediaPlayerState = MP_State.Stopped;
}else{
Toast.makeText(AndroidPlayerActivity.this,
"Invalid State@cmdStop() - skip",
Toast.LENGTH_LONG).show();
}
showMediaPlayerState();
}
private void cmdSeekTo(int msec){
if(mediaPlayerState == MP_State.Prepared
||mediaPlayerState == MP_State.Started
||mediaPlayerState == MP_State.Paused
||mediaPlayerState == MP_State.PlaybackCompleted){
mediaPlayer.seekTo(msec);
}else{
Toast.makeText(AndroidPlayerActivity.this,
"Invalid State@cmdSeekTo() - skip",
Toast.LENGTH_LONG).show();
}
showMediaPlayerState();
}
private void showMediaPlayerState(){
switch(mediaPlayerState){
case Idle:
state.setText("Idle");
break;
case Initialized:
state.setText("Initialized");
break;
case Prepared:
state.setText("Prepared");
break;
case Started:
state.setText("Started");
break;
case Paused:
state.setText("Paused");
break;
case Stopped:
state.setText("Stopped");
break;
case PlaybackCompleted:
state.setText("PlaybackCompleted");
break;
case End:
state.setText("End");
break;
case Error:
state.setText("Error");
break;
case Preparing:
state.setText("Preparing");
break;
default:
state.setText("Unknown!");
}
}
OnClickListener buttonPlayOnClickListener
= new OnClickListener(){
@Override
public void onClick(View v) {
if(srcPath == null){
Toast.makeText(AndroidPlayerActivity.this,
"No file selected",
Toast.LENGTH_LONG).show();
}else{
cmdPrepare();
cmdStart();
}
}
};
OnClickListener buttonPauseOnClickListener
= new OnClickListener(){
@Override
public void onClick(View v) {
cmdPause();
}
};
OnClickListener buttonStopOnClickListener
= new OnClickListener(){
@Override
public void onClick(View v) {
cmdStop();
}
};
OnClickListener buttonOpenOnClickListener
= new OnClickListener(){
@Override
public void onClick(View arg0) {
Intent intent = new Intent();
intent.setType("audio/mp3");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(
intent, "Open Audio (mp3) file"), RQS_OPEN_AUDIO_MP3);
}
};
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == RESULT_OK) {
if (requestCode == RQS_OPEN_AUDIO_MP3) {
Uri audioFileUri = data.getData();
srcPath = audioFileUri.getPath();
info.setText(srcPath);
cmdReset();
cmdSetDataSource(srcPath);
}
}
}
}
Download the files.
No comments:
Post a Comment