MainActivity.java
package com.example.androidmp3player;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.Fragment;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnErrorListener;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
Button btnStart, btnPause, btnStop, btnSeek;
TextView textState, textDuration, textPosition;
MediaPlayer mediaPlayer;
private int stateMediaPlayer;
private final int STATE_Idle = 0;
private final int STATE_Initialized = 1;
private final int STATE_Preparing = 2;
private final int STATE_Prepared = 3;
private final int STATE_Started = 4;
private final int STATE_Paused = 5;
private final int STATE_Stopped = 6;
private final int STATE_PlaybackCompleted = 7;
private final int STATE_End = 8;
private final int STATE_Error = 9;
public PlaceholderFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
initMediaPlayer();
}
@Override
public void onDestroy() {
Toast.makeText(getActivity(),
"release mediaPlayer",
Toast.LENGTH_LONG).show();
mediaPlayer.release();
mediaPlayer = null;
setPlayerState(STATE_End);
super.onDestroy();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container,
false);
btnStart = (Button) rootView.findViewById(R.id.start);
btnPause = (Button) rootView.findViewById(R.id.pause);
btnStop = (Button) rootView.findViewById(R.id.stop);
btnSeek = (Button) rootView.findViewById(R.id.seekto);
btnStart.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(stateMediaPlayer==STATE_Prepared
|| stateMediaPlayer==STATE_Started
|| stateMediaPlayer==STATE_Paused
|| stateMediaPlayer==STATE_PlaybackCompleted){
mediaPlayer.start();
setPlayerState(STATE_Started);
displayDurationPosition();
}else{
Toast.makeText(getActivity(),
"Play at Invalid state!",
Toast.LENGTH_LONG).show();
}
}
});
btnPause.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(stateMediaPlayer==STATE_Started
|| stateMediaPlayer==STATE_Paused
|| stateMediaPlayer==STATE_Prepared //simulate a error case
|| stateMediaPlayer==STATE_PlaybackCompleted){
mediaPlayer.pause();
setPlayerState(STATE_Paused);
displayDurationPosition();
}else{
Toast.makeText(getActivity(),
"Pause at Invalid state!",
Toast.LENGTH_LONG).show();
}
}
});
btnStop.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(stateMediaPlayer==STATE_Prepared
|| stateMediaPlayer==STATE_Started
|| stateMediaPlayer==STATE_Stopped
|| stateMediaPlayer==STATE_Paused
|| stateMediaPlayer==STATE_PlaybackCompleted){
//Stop
mediaPlayer.stop();
setPlayerState(STATE_Stopped);
//then parepare in background thread
mediaPlayer.prepareAsync();
setPlayerState(STATE_Preparing);
displayDurationPosition();
}else{
Toast.makeText(getActivity(),
"Stop at Invalid state!",
Toast.LENGTH_LONG).show();
}
}
});
btnSeek.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
if(stateMediaPlayer==STATE_Prepared
|| stateMediaPlayer==STATE_Started
|| stateMediaPlayer==STATE_Paused
|| stateMediaPlayer==STATE_PlaybackCompleted){
mediaPlayer.seekTo(0);
displayDurationPosition();
}else{
Toast.makeText(getActivity(),
"SeekTo at Invalid state!",
Toast.LENGTH_LONG).show();
}
}});
textState = (TextView) rootView.findViewById(R.id.state);
textState.setText(getPlayerState());
textDuration = (TextView) rootView.findViewById(R.id.duration);
textPosition = (TextView) rootView.findViewById(R.id.position);
displayDurationPosition();
textDuration.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
displayDurationPosition();
}});
textPosition.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
displayDurationPosition();
}});
return rootView;
}
private void displayDurationPosition(){
textDuration.setText(
"Duration: " + mediaPlayer.getDuration() + " ms");
textPosition.setText(
"Current Position: " + mediaPlayer.getCurrentPosition() + " ms");
}
private void initMediaPlayer() {
Toast.makeText(getActivity(),
"initMediaPlayer()",
Toast.LENGTH_LONG).show();
mediaPlayer = MediaPlayer.create(getActivity(), R.raw.vespers);
setPlayerState(STATE_Prepared);
mediaPlayer.setOnPreparedListener(new OnPreparedListener(){
@Override
public void onPrepared(MediaPlayer mp) {
setPlayerState(STATE_Prepared);
displayDurationPosition();
}});
mediaPlayer.setOnCompletionListener(new OnCompletionListener(){
@Override
public void onCompletion(MediaPlayer mp) {
setPlayerState(STATE_PlaybackCompleted);
displayDurationPosition();
}});
//Handle Error
mediaPlayer.setOnErrorListener(new OnErrorListener(){
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
setPlayerState(STATE_Error);
String errorWhat;
switch(what){
case MediaPlayer.MEDIA_ERROR_UNKNOWN:
errorWhat = "MEDIA_ERROR_UNKNOWN";
break;
case MediaPlayer.MEDIA_ERROR_SERVER_DIED:
errorWhat = "MEDIA_ERROR_SERVER_DIED";
break;
default:
errorWhat = "!";
}
String errorExtra;
switch(extra){
case MediaPlayer.MEDIA_ERROR_IO:
errorExtra = "MEDIA_ERROR_IO";
break;
case MediaPlayer.MEDIA_ERROR_MALFORMED:
errorExtra = "MEDIA_ERROR_MALFORMED";
break;
case MediaPlayer.MEDIA_ERROR_UNSUPPORTED:
errorExtra = "MEDIA_ERROR_UNSUPPORTED";
break;
case MediaPlayer.MEDIA_ERROR_TIMED_OUT:
errorExtra = "MEDIA_ERROR_TIMED_OUT";
break;
default:
errorExtra = "!";
}
Toast.makeText(getActivity(),
"Error" + "\n"
+ errorWhat + "\n"
+ errorExtra,
Toast.LENGTH_LONG).show();
//release
mp.release();
initMediaPlayer();
return true;
}});
}
private void setPlayerState(int st){
stateMediaPlayer = st;
String stringState = getPlayerState();
if(textState!=null){
textState.setText(stringState);
}else{
Toast.makeText(getActivity(),
stringState, Toast.LENGTH_LONG).show();
}
}
private String getPlayerState(){
String strSt;
switch(stateMediaPlayer){
case STATE_Idle:
strSt = "Idle";
break;
case STATE_Initialized:
strSt = "Initialized";
break;
case STATE_Preparing:
strSt = "Preparing";
break;
case STATE_Prepared:
strSt = "Prepared";
break;
case STATE_Started:
strSt = "Started";
break;
case STATE_Paused:
strSt = "Paused";
break;
case STATE_Stopped:
strSt = "Stopped";
break;
case STATE_PlaybackCompleted:
strSt = "PlaybackCompleted";
break;
case STATE_End:
strSt = "End";
break;
case STATE_Error:
strSt = "Error";
break;
default:
strSt = "unknown...";
}
return strSt;
}
}
}
Download the files, without mp3.Next:
- Implement time bar for MediaPlayer, also introduce bug of MediaPlayer.seekTo()
