Android构建音频播放器教程(四)
11.更新AndroidManifest.xml文件
添加android:configChanges=”keyboardHidden|orientation”，
AndroidManifest.xml
<?xml version="1.0"encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.androidhive.musicplayer"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="8"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name">
<activity
android:name=".AndroidBuildingMusicPlayerActivity"
android:label="@string/app_name"
android:configChanges="keyboardHidden|orientation">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity
android:name=".PlayListActivity"/>
</application>
</manifest>
<!-- AndroidBuildingMusicPlayerActivity -->
12.最后的代码
下面是AndroidBuildingMusicPlayerActivity类的完整代码
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package
com.androidhive.musicplayer;
import
java.io.IOException;
import
java.util.ArrayList;
import
java.util.HashMap;
import
java.util.Random;
import
android.app.Activity;
import
android.content.Intent;
import
android.media.MediaPlayer;
import
android.media.MediaPlayer.OnCompletionListener;
import
android.os.Bundle;
import
android.os.Handler;
import
android.view.View;
import
android.widget.ImageButton;
import
android.widget.SeekBar;
import
android.widget.TextView;
import
android.widget.Toast;
publicclass
AndroidBuildingMusicPlayerActivity
extends
Activity
implements
OnCompletionListener, SeekBar.OnSeekBarChangeListener {
private
ImageButton btnPlay;
private
ImageButton btnForward;
private
ImageButton btnBackward;
private
ImageButton btnNext;
private
ImageButton btnPrevious;
private
ImageButton btnPlaylist;
private
ImageButton btnRepeat;
private
ImageButton btnShuffle;
private
SeekBar songProgressBar;
private
TextView songTitleLabel;
private
TextView songCurrentDurationLabel;
private
TextView songTotalDurationLabel;
// Media Player
private
MediaPlayer mp;
// Handler to update UI timer, progress bar etc,.
private
Handler mHandler =
new
Handler();;
private
SongsManager songManager;
private
Utilities utils;
privateint
seekForwardTime =
5000
;
// 5000 milliseconds
privateint
seekBackwardTime =
5000
;
// 5000 milliseconds
privateint
currentSongIndex =
0
;
privateboolean
isShuffle =
false
;
privateboolean
isRepeat =
false
;
private
ArrayList<HashMap<String, String>> songsList =
new
ArrayList<HashMap<String, String>>();
@Override
publicvoid
onCreate(Bundle savedInstanceState) {
super
.onCreate(savedInstanceState);
setContentView(R.layout.player);
// All player buttons
btnPlay = (ImageButton) findViewById(R.id.btnPlay);
btnForward = (ImageButton) findViewById(R.id.btnForward);
btnBackward = (ImageButton) findViewById(R.id.btnBackward);
btnNext = (ImageButton) findViewById(R.id.btnNext);
btnPrevious = (ImageButton) findViewById(R.id.btnPrevious);
btnPlaylist = (ImageButton) findViewById(R.id.btnPlaylist);
btnRepeat = (ImageButton) findViewById(R.id.btnRepeat);
btnShuffle = (ImageButton) findViewById(R.id.btnShuffle);
songProgressBar = (SeekBar) findViewById(R.id.songProgressBar);
songTitleLabel = (TextView) findViewById(R.id.songTitle);
songCurrentDurationLabel = (TextView) findViewById(R.id.songCurrentDurationLabel);
songTotalDurationLabel = (TextView) findViewById(R.id.songTotalDurationLabel);
// Mediaplayer
mp =
new
MediaPlayer();
songManager =
new
SongsManager();
utils =
new
Utilities();
// Listeners
songProgressBar.setOnSeekBarChangeListener(
this
);
// Important
mp.setOnCompletionListener(
this
);
// Important
// Getting all songs list
songsList = songManager.getPlayList();
// By default play first song
playSong(
0
);
/**
* Play button click event
* plays a song and changes button to pause image
* pauses a song and changes button to play image
* */
btnPlay.setOnClickListener(
new
View.OnClickListener() {
@Override
publicvoid
onClick(View arg0) {
// check for already playing
if
(mp.isPlaying()){
if
(mp!=
null
){
mp.pause();
// Changing button image to play button
btnPlay.setImageResource(R.drawable.btn_play);
}
}
else
{
// Resume song
if
(mp!=
null
){
mp.start();
// Changing button image to pause button
btnPlay.setImageResource(R.drawable.btn_pause);
}
}
}
});
/**
* Forward button click event
* Forwards song specified seconds
* */
btnForward.setOnClickListener(
new
View.OnClickListener() {
@Override
publicvoid
onClick(View arg0) {
// get current song position
int
currentPosition = mp.getCurrentPosition();
// check if seekForward time is lesser than song duration
if
(currentPosition + seekForwardTime <= mp.getDuration()){
// forward song
mp.seekTo(currentPosition + seekForwardTime);
}
else
{
// forward to end position
mp.seekTo(mp.getDuration());
}
}
});
/**
* Backward button click event
* Backward song to specified seconds
* */
btnBackward.setOnClickListener(
new
View.OnClickListener() {
@Override
publicvoid
onClick(View arg0) {
// get current song position
int
currentPosition = mp.getCurrentPosition();
// check if seekBackward time is greater than 0 sec
if
(currentPosition - seekBackwardTime >=
0
){
// forward song
mp.seekTo(currentPosition - seekBackwardTime);
}
else
{
// backward to starting position
mp.seekTo(
0
);
}
}
});
/**
* Next button click event
* Plays next song by taking currentSongIndex + 1
* */
btnNext.setOnClickListener(
new
View.OnClickListener() {
@Override
publicvoid
onClick(View arg0) {
// check if next song is there or not
if
(currentSongIndex < (songsList.size() -
1
)){
playSong(currentSongIndex +
1
);
currentSongIndex = currentSongIndex +
1
;
}
else
{
// play first song
playSong(
0
);
currentSongIndex =
0
;
}
}
});
/**
* Back button click event
* Plays previous song by currentSongIndex - 1
* */
btnPrevious.setOnClickListener(
new
View.OnClickListener() {
@Override
publicvoid
onClick(View arg0) {
if
(currentSongIndex >
0
){
playSong(currentSongIndex -
1
);
currentSongIndex = currentSongIndex -
1
;
}
else
{
// play last song
playSong(songsList.size() -
1
);
currentSongIndex = songsList.size() -
1
;
}
}
});
/**
* Button Click event for Repeat button
* Enables repeat flag to true
* */
btnRepeat.setOnClickListener(
new
View.OnClickListener() {
@Override
publicvoid
onClick(View arg0) {
if
(isRepeat){
isRepeat =
false
;
Toast.makeText(getApplicationContext(),
"Repeat is OFF"
, Toast.LENGTH_SHORT).show();
btnRepeat.setImageResource(R.drawable.btn_repeat);
}
else
{
// make repeat to true
isRepeat =
true
;
Toast.makeText(getApplicationContext(),
"Repeat is ON"
, Toast.LENGTH_SHORT).show();
// make shuffle to false
isShuffle =
false
;
btnRepeat.setImageResource(R.drawable.btn_repeat_focused);
btnShuffle.setImageResource(R.drawable.btn_shuffle);
}
}
});
/**
* Button Click event for Shuffle button
* Enables shuffle flag to true
* */
btnShuffle.setOnClickListener(
new
View.OnClickListener() {
@Override
publicvoid
onClick(View arg0) {
if
(isShuffle){
isShuffle =
false
;
Toast.makeText(getApplicationContext(),
"Shuffle is OFF"
, Toast.LENGTH_SHORT).show();
btnShuffle.setImageResource(R.drawable.btn_shuffle);
}
else
{
// make repeat to true
isShuffle=
true
;
Toast.makeText(getApplicationContext(),
"Shuffle is ON"
, Toast.LENGTH_SHORT).show();
// make shuffle to false
isRepeat =
false
;
btnShuffle.setImageResource(R.drawable.btn_shuffle_focused);
btnRepeat.setImageResource(R.drawable.btn_repeat);
}
}
});
/**
* Button Click event for Play list click event
* Launches list activity which displays list of songs
* */
btnPlaylist.setOnClickListener(
new
View.OnClickListener() {
@Override
publicvoid
onClick(View arg0) {
Intent i =
new
Intent(getApplicationContext(), PlayListActivity.
class
);
startActivityForResult(i,
100
);
}
});
}
/**
* Receiving song index from playlist view
* and play the song
* */
@Override
protectedvoid
onActivityResult(
int
requestCode,
int
resultCode, Intent data) {
super
.onActivityResult(requestCode, resultCode, data);
if
(resultCode ==
100
){
currentSongIndex = data.getExtras().getInt(
"songIndex"
);
// play selected song
playSong(currentSongIndex);
}
}
/**
* Function to play a song
* @param songIndex - index of song
* */
publicvoid
playSong(
int
songIndex){
// Play song
try
{
mp.reset();
mp.setDataSource(songsList.get(songIndex).get(
"songPath"
));
mp.prepare();
mp.start();
// Displaying Song title
String songTitle = songsList.get(songIndex).get(
"songTitle"
);
songTitleLabel.setText(songTitle);
// Changing Button Image to pause image
btnPlay.setImageResource(R.drawable.btn_pause);
// set Progress bar values
songProgressBar.setProgress(
0
);
songProgressBar.setMax(
100
);
// Updating progress bar
updateProgressBar();
}
catch
(IllegalArgumentException e) {
e.printStackTrace();
}
catch
(IllegalStateException e) {
e.printStackTrace();
}
catch
(IOException e) {
e.printStackTrace();
}
}
/**
* Update timer on seekbar
* */
publicvoid
updateProgressBar() {
mHandler.postDelayed(mUpdateTimeTask,
100
);
}
/**
* Background Runnable thread
* */
private
Runnable mUpdateTimeTask =
new
Runnable() {
publicvoid
run() {
long
totalDuration = mp.getDuration();
long
currentDuration = mp.getCurrentPosition();
// Displaying Total Duration time
songTotalDurationLabel.setText(
""
+utils.milliSecondsToTimer(totalDuration));
// Displaying time completed playing
songCurrentDurationLabel.setText(
""
+utils.milliSecondsToTimer(currentDuration));
// Updating progress bar
int
progress = (
int
)(utils.getProgressPercentage(currentDuration, totalDuration));
//Log.d("Progress", ""+progress);
songProgressBar.setProgress(progress);
// Running this thread after 100 milliseconds
mHandler.postDelayed(
this
,
100
);
}
};
/**
*
* */
@Override
publicvoid
onProgressChanged(SeekBar seekBar,
int
progress,
boolean
fromTouch) {
}
/**
* When user starts moving the progress handler
* */
@Override
publicvoid
onStartTrackingTouch(SeekBar seekBar) {
// remove message Handler from updating progress bar
mHandler.removeCallbacks(mUpdateTimeTask);
}
/**
* When user stops moving the progress hanlder
* */
@Override
publicvoid
onStopTrackingTouch(SeekBar seekBar) {
mHandler.removeCallbacks(mUpdateTimeTask);
int
totalDuration = mp.getDuration();
int
currentPosition = utils.progressToTimer(seekBar.getProgress(), totalDuration);
// forward or backward to certain seconds
mp.seekTo(currentPosition);
// update timer progress again
updateProgressBar();
}
/**
* On Song Playing completed
* if repeat is ON play same song again
* if shuffle is ON play random song
* */
@Override
publicvoid
onCompletion(MediaPlayer arg0) {
// check for repeat is ON or OFF
if
(isRepeat){
// repeat is on play same song again
playSong(currentSongIndex);
}
else
if
(isShuffle){
// shuffle is on - play a random song
Random rand =
new
Random();
currentSongIndex = rand.nextInt((songsList.size() -
1
) -
0
+
1
) +
0
;
playSong(currentSongIndex);
}
else
{
// no repeat or shuffle ON - play next song
if
(currentSongIndex < (songsList.size() -
1
)){
playSong(currentSongIndex +
1
);
currentSongIndex = currentSongIndex +
1
;
}
else
{
// play first song
playSong(
0
);
currentSongIndex =
0
;
}
}
}
@Override
publicvoid
onDestroy(){
super
.onDestroy();
mp.release();
}
}
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14.往模拟器SDCard里添加mp3文件(用于测试)
最后，我们需要往模拟器里面添加几首歌曲用来播放。
1.在用你的Android模拟器来测试这个程序，你需要加载
一些歌曲到你的模拟器。您可以使用adb工具，它往Android SDK模拟器SD卡发送文件。
导航到你的Android SDK文件夹/平台工具/使用命令行。和使用push命令，您可以发送文件到SD卡。 （开始你的模拟器执行推送命令之前）
导航到你的Android SDK文件夹/平台工具/使用命令行。和使用push命令，您可以发送文件到SD卡。 （开始你的模拟器执行推送命令之前）
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platform-tools> adb push "c:\Songs\White Flag.mp3" "/sdcard/"
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15.运行
运行我们的程序，效果如下：
dai
完整代码已经放在网盘里了，地址如下：
http://115.com/file/dptieqtn#AndroidBuildingMusicPlayer.zip