音乐播放器

来源：互联网发布：买吉他知乎编辑：程序博客网时间：2024/06/05 21:55

前提是你模拟器里有音乐或者手机上有音乐

//效果

//布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout

xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="bawei.musicdemo.MainActivity">

<ImageView
android:src="@drawable/t1"
android:layout_width="200sp"
android:layout_height="200sp"/>
<SeekBar
android:id="@+id/seekBar"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:text="上一首"
android:id="@+id/lastMusic"
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
<Button
android:text="下一首"
android:id="@+id/nextMusic"
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<Button
android:id="@+id/pause"
android:text="暂停"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/begin"
android:text="开始"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button
android:id="@+id/stop"
android:text="停止"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

</LinearLayout>
</LinearLayout>

// MainActivity

import android.database.Cursor;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.Toast;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class MainActivity extends AppCompatActivity {

private int index=0;
private Button lastMusic;
private Button nextMusic;
private Button begin;
private Button pause;
private Button stop;
private SeekBar seekBar;
private static final int SEARCH_MUSIC_SUCCESS=0;
MediaPlayer mp=new MediaPlayer();
private List<String> list= new ArrayList<>();
Handler handler=new Handler(){
@Override
public void handleMessage(Message msg) {
Log.d("msg",""+list.size());
//initstart();

//得到当前的进度
int position=mp.getCurrentPosition();
//得到时间
int time=mp.getDuration();
//得到总长度
int max=seekBar.getMax();
seekBar.setProgress(position);
super.handleMessage(msg);
}
};
private void initPlayer(){

//后台线程发送消息进行更新进度条一秒更新一次
final int milliseconds=100;
new Thread(){
@Override
public void run() {
while(true){
try {
sleep(milliseconds);
} catch (InterruptedException e) {
e.printStackTrace();
}
//启动并发送
handler.sendEmptyMessage(0);
}
}
}.start();
}
//初始化seekbar
private void initseekBar(){
seekBar.setMax(mp.getDuration());
seekBar.setProgress(0);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//找控件
initdata();
//找音乐
initfind();
//让它播
//initstart();
//上一首
// last();
//下一首
// next();
//开始播放
// initstart();
//暂停
// zanting();
//停止
// end();

//启动模式
/* IntentFilter filter=new IntentFilter();
filter.addAction("finish");
registerReceiver(mFinishReceiver,filter);
.....
*/

}
//给个监听
View.OnClickListener onClickListener=new View.OnClickListener() {
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.lastMusic:
last();
break;
case R.id.nextMusic:
next();
break;
case R.id.begin:
initstart();
break;
case R.id.pause:
mp.pause();
break;
case R.id.stop:
mp.stop();
break;
}
}
};
//上一首
private void last() {
if ((index-1)>=0){
index--;
initstart();
}else {
Toast.makeText(MainActivity.this,"这已经是第一首了",Toast.LENGTH_SHORT).show();
}
}
//下一首
private void next() {
if((index+1)<list.size()){
index++;
initstart();
}else{
Toast.makeText(this,"您就这点歌啦",Toast.LENGTH_LONG).show();
}
}

private void initstart (){
if (list.size()>0&&index<list.size()){
//路径
String SongPath=list.get(index);
//释放资源
mp.reset();
//加载歌曲文件
try {
mp.setDataSource(SongPath);
//准备
//mp.release();
mp.prepare();
mp.start();
initseekBar();
} catch (IOException e) {
e.printStackTrace();
}
}
else{
Toast.makeText(this,"播放列表为空", Toast.LENGTH_SHORT).show();
}
}
private void zanting() {
}
private void end() {
}

//扫描音乐文件
private void initfind() {
Cursor mAudiocursor=this.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,null,null,null,MediaStore.Audio.AudioColumns.TITLE);//排序方式
//循环输出歌曲的信息
List<Map<String,Object>> mlistData=new ArrayList<Map<String,Object>>();
for(int i=0;i<mAudiocursor.getCount();i++){
mAudiocursor.moveToNext();
//找到歌曲标题和总时间对应的列索引
int indexTitle=mAudiocursor.getColumnIndex(MediaStore.Audio.AudioColumns.TITLE);//歌名
//艺术家
int indexARTIST=mAudiocursor.getColumnIndex(MediaStore.Audio.AudioColumns.ARTIST);
//专辑
int indexALBUM=mAudiocursor.getColumnIndex(MediaStore.Audio.AudioColumns.ALBUM);
String strTitle=mAudiocursor.getString(indexTitle);
String strARTIST=mAudiocursor.getString(indexARTIST);
String strALBUM=mAudiocursor.getString(indexALBUM);
Log.d("msg","歌曲名"+strTitle);
HashMap<String,Object> nowMap=new HashMap<String, Object>();
nowMap.put("songName",strTitle+"---"+strARTIST+"---"+strALBUM);
mlistData.add(nowMap);

}
list.clear();
//是否有外部存储设备
if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
new Thread(new Runnable() {
String[] ext={".mp3"};
File file=Environment.getExternalStorageDirectory();
@Override
public void run() {
search(file,ext);
handler.sendEmptyMessage(SEARCH_MUSIC_SUCCESS);
}
}).start();
}else{
Toast.makeText(this,"请插入外部存储设备。。",Toast.LENGTH_LONG).show();
}
}
//搜索音乐文件
private void search(File file,String[] ext){
if (file!=null){
if (file.isDirectory()){
File[] listFile=file.listFiles();
if (listFile!=null){
for (int i=0;i<listFile.length;i++){
search(listFile[i],ext);
}
}
}else{
String filename=file.getAbsolutePath();
for (int i=0;i<ext.length;i++){
if (filename.endsWith(ext[i])){
list.add(filename);
break;
}
}
}
}
}
private void initdata() {

seekBar=(SeekBar)findViewById(R.id.seekBar);
lastMusic=(Button)findViewById(R.id.lastMusic);
nextMusic=(Button)findViewById(R.id.nextMusic);
begin=(Button)findViewById(R.id.begin);
pause=(Button)findViewById(R.id.pause);
stop=(Button)findViewById(R.id.stop);
lastMusic.setOnClickListener(onClickListener);
nextMusic.setOnClickListener(onClickListener);
begin.setOnClickListener(onClickListener);
pause.setOnClickListener(onClickListener);
stop.setOnClickListener(onClickListener);

}
/* protected BroadcastReceiver mFinishReceiver=new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if("finish".equals(intent.getAction())){
Log.e("####","I am"+getLocalClassName()+",now finishing myself...");
finish();
}
}
};*/

}

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