Android开发音乐播放器
Android开发音乐播放器
音乐播放器中综合了以下内容:
SeekBar、ListView、广播接收者(以代码的形式注册Receiver)、系统服务、MediaPlayer
实现的功能:
1.暂停/播放、下一首/上一首,点击某一首时播放
2.支持拖动进度条快进
3.列表排序
4.来电话时,停止播放,挂断后继续播放
5.可在后台播放
效果图:
界面:
main.xml:
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:Android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <TextView
- android:id="@+id/name"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- />
- <SeekBar
- android:id="@+id/seekBar"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:layout_marginBottom="5dp"
- />
- <LinearLayout
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:layout_marginBottom="20dp"
- >
- <Button
- android:layout_width="40dp"
- android:layout_height="40dp"
- android:text="|◀"
- android:onClick="previous"
- />
- <Button
- android:id="@+id/pp"
- android:layout_width="40dp"
- android:layout_height="40dp"
- android:text="▶"
- android:onClick="pp"
- />
- <Button
- android:layout_width="40dp"
- android:layout_height="40dp"
- android:text="▶|"
- android:onClick="next"
- />
- </LinearLayout>
- <ListView
- android:id="@+id/list"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- />
- </LinearLayout>
item.xml:
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout
- xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:padding="10dp"
- >
- <TextView
- android:id="@+id/mName"
- android:layout_width="fill_parent"
- android:layout_height="wrap_content"
- android:textSize="15sp"
- />
- </LinearLayout>
MainActivity:
- package cn.test.audio;
- import java.io.File;
- import java.util.ArrayList;
- import java.util.Collections;
- import java.util.HashMap;
- import java.util.List;
- import java.util.Map;
- import android.app.Activity;
- import android.content.BroadcastReceiver;
- import android.content.Context;
- import android.content.Intent;
- import android.content.IntentFilter;
- import android.media.MediaPlayer;
- import android.media.MediaPlayer.OnCompletionListener;
- import android.os.Bundle;
- import android.os.Environment;
- import android.os.Handler;
- import android.telephony.PhoneStateListener;
- import android.telephony.TelephonyManager;
- import android.view.View;
- import android.widget.AdapterView;
- import android.widget.Button;
- import android.widget.ListView;
- import android.widget.SeekBar;
- import android.widget.SimpleAdapter;
- import android.widget.TextView;
- import android.widget.AdapterView.OnItemClickListener;
- import android.widget.SeekBar.OnSeekBarChangeListener;
- public class MainActivity extends Activity {
- private TextView nameTextView;
- private SeekBar seekBar;
- private ListView listView;
- private List<Map<String, String>> data;
- private int current;
- private MediaPlayer player;
- private Handler handler = new Handler();
- private Button ppButton;
- private boolean isPause;
- private boolean isStartTrackingTouch;
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- nameTextView = (TextView) findViewById(R.id.name);
- seekBar = (SeekBar) findViewById(R.id.seekBar);
- listView = (ListView) findViewById(R.id.list);
- ppButton = (Button) findViewById(R.id.pp);
- //创建一个音乐播放器
- player = new MediaPlayer();
- //显示音乐播放列表
- generateListView();
- //进度条监听器
- seekBar.setOnSeekBarChangeListener(new MySeekBarListener());
- //播放器监听器
- player.setOnCompletionListener(new MyPlayerListener());
- //意图过滤器
- IntentFilter filter = new IntentFilter();
- //播出电话暂停音乐播放
- filter.addAction("android.intent.action.NEW_OUTGOING_CALL");
- registerReceiver(new PhoneListener(), filter);
- //创建一个电话服务
- TelephonyManager manager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
- //监听电话状态,接电话时停止播放
- manager.listen(new MyPhoneStateListener(), PhoneStateListener.LISTEN_CALL_STATE);
- }
- /*
- * 监听电话状态
- */
- private final class MyPhoneStateListener extends PhoneStateListener {
- public void onCallStateChanged(int state, String incomingNumber) {
- pause();
- }
- }
- /*
- * 播放器监听器
- */
- private final class MyPlayerListener implements OnCompletionListener {
- //歌曲播放完后自动播放下一首歌曲
- public void onCompletion(MediaPlayer mp) {
- next();
- }
- }
- /*
- * 下一首按钮
- */
- public void next(View view) {
- next();
- }
- /*
- * 前一首按钮
- */
- public void previous(View view) {
- previous();
- }
- /*
- * 播放前一首歌
- */
- private void previous() {
- current = current - 1 < 0 ? data.size() - 1 : current - 1;
- play();
- }
- /*
- * 播放下一首歌
- */
- private void next() {
- current = (current + 1) % data.size();
- play();
- }
- /*
- * 进度条监听器
- */
- private final class MySeekBarListener implements OnSeekBarChangeListener {
- //移动触发
- public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
- }
- //起始触发
- public void onStartTrackingTouch(SeekBar seekBar) {
- isStartTrackingTouch = true;
- }
- //结束触发
- public void onStopTrackingTouch(SeekBar seekBar) {
- player.seekTo(seekBar.getProgress());
- isStartTrackingTouch = false;
- }
- }
- /*
- * 显示音乐播放列表
- */
- private void generateListView() {
- List<File> list = new ArrayList<File>();
- //获取sdcard中的所有歌曲
- findAll(Environment.getExternalStorageDirectory(), list);
- //播放列表进行排序,字符顺序
- Collections.sort(list);
- data = new ArrayList<Map<String, String>>();
- for (File file : list) {
- Map<String, String> map = new HashMap<String, String>();
- map.put("name", file.getName());
- map.put("path", file.getAbsolutePath());
- data.add(map);
- }
- SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item, new String[] { "name" }, new int[] { R.id.mName });
- listView.setAdapter(adapter);
- listView.setOnItemClickListener(new MyItemListener());
- }
- private final class MyItemListener implements OnItemClickListener {
- public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
- current = position;
- play();
- }
- }
- private void play() {
- try {
- //重播
- player.reset();
- //获取歌曲路径
- player.setDataSource(data.get(current).get("path"));
- //缓冲
- player.prepare();
- //开始播放
- player.start();
- //显示歌名
- nameTextView.setText(data.get(current).get("name"));
- //设置进度条长度
- seekBar.setMax(player.getDuration());
- //播放按钮样式
- ppButton.setText("||");
- //发送一个Runnable, handler收到之后就会执行run()方法
- handler.post(new Runnable() {
- public void run() {
- // 更新进度条状态
- if (!isStartTrackingTouch)
- seekBar.setProgress(player.getCurrentPosition());
- // 1秒之后再次发送
- handler.postDelayed(this, 1000);
- }
- });
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- /**
- * 查找文件路径中所有mp3文件
- * @param file 要找的目录
- * @param list 用来装文件的List
- */
- private void findAll(File file, List<File> list) {
- File[] subFiles = file.listFiles();
- if (subFiles != null)
- for (File subFile : subFiles) {
- if (subFile.isFile() && subFile.getName().endsWith(".mp3"))
- list.add(subFile);
- else if (subFile.isDirectory())//如果是目录
- findAll(subFile, list); //递归
- }
- }
- /*
- * 暂停/播放按钮
- */
- public void pp(View view) {
- //默认从第一首歌曲开始播放
- if (!player.isPlaying() && !isPause) {
- play();
- return;
- }
- Button button = (Button) view;
- //暂停/播放按钮
- if ("||".equals(button.getText())) {
- pause();
- button.setText("▶");
- } else {
- resume();
- button.setText("||");
- }
- }
- /*
- * 开始操作
- */
- private void resume() {
- if (isPause) {
- player.start();
- isPause = false;
- }
- }
- /*
- * 暂停操作
- */
- private void pause() {
- if (player != null && player.isPlaying()) {
- player.pause();
- isPause = true;
- }
- }
- /*
- * 收到广播时暂停
- */
- private final class PhoneListener extends BroadcastReceiver {
- public void onReceive(Context context, Intent intent) {
- pause();
- }
- }
- /*
- * 恢复播放
- * @see android.app.Activity#onResume()
- */
- protected void onResume() {
- super.onResume();
- resume();
- }
- }
注册权限:
- <?xml version="1.0" encoding="utf-8"?>
- <manifest xmlns:android="http://schemas.android.com/apk/res/android"
- package="cn.itcast.audio"
- android:versionCode="1"
- android:versionName="1.0">
- <application android:icon="@drawable/icon" android:label="@string/app_name">
- <activity android:name=".MainActivity"
- android:label="@string/app_name">
- <intent-filter>
- <action android:name="android.intent.action.MAIN" />
- <category android:name="android.intent.category.LAUNCHER" />
- </intent-filter>
- </activity>
- </application>
- <uses-sdk android:minSdkVersion="8" />
- <!-- 监听电话呼出 -->
- <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/>
- <!-- 监听电话状态改变 -->
- <uses-permission android:name="android.permission.READ_PHONE_STATE" />
- </manifest>
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