音樂播放器中綜合了以下內容:
SeekBar、ListView、廣播接收者(以代碼的形式注冊Receiver)、系統服務、MediaPlayer
實現的功能:
1.暫停/播放、下一首/上一首,點擊某一首時播放
2.支持拖動進度條快進
3.列表排序
4.來電話時,停止播放,掛斷後繼續播放
5.可在後台播放
效果圖:
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);
-
- //創建一個音樂播放器
- player = new MediaPlayer();
-
- //顯示音樂播放列表
- generateListView();
-
- //進度條監聽器
- seekBar.setOnSeekBarChangeListener(new MySeekBarListener());
-
- //播放器監聽器
- player.setOnCompletionListener(new MyPlayerListener());
-
- //意圖過濾器
- IntentFilter filter = new IntentFilter();
-
- //播出電話暫停音樂播放
- filter.addAction("android.intent.action.NEW_OUTGOING_CALL");
- registerReceiver(new PhoneListener(), filter);
-
- //創建一個電話服務
- TelephonyManager manager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
-
- //監聽電話狀態,接電話時停止播放
- manager.listen(new MyPhoneStateListener(), PhoneStateListener.LISTEN_CALL_STATE);
- }
-
- /*
- * 監聽電話狀態
- */
- private final class MyPhoneStateListener extends PhoneStateListener {
- public void onCallStateChanged(int state, String incomingNumber) {
- pause();
- }
- }
-
- /*
- * 播放器監聽器
- */
- private final class MyPlayerListener implements OnCompletionListener {
- //歌曲播放完後自動播放下一首歌曲
- public void onCompletion(MediaPlayer mp) {
- next();
- }
- }
-
- /*
- * 下一首按鈕
- */
- public void next(View view) {
- next();
- }
-
- /*
- * 前一首按鈕
- */
- 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();
- }
-
- /*
- * 進度條監聽器
- */
- private final class MySeekBarListener implements OnSeekBarChangeListener {
- //移動觸發
- public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
- }
-
- //起始觸發
- public void onStartTrackingTouch(SeekBar seekBar) {
- isStartTrackingTouch = true;
- }
-
- //結束觸發
- public void onStopTrackingTouch(SeekBar seekBar) {
- player.seekTo(seekBar.getProgress());
- isStartTrackingTouch = false;
- }
- }
-
- /*
- * 顯示音樂播放列表
- */
- private void generateListView() {
- List<File> list = new ArrayList<File>();
-
- //獲取sdcard中的所有歌曲
- findAll(Environment.getExternalStorageDirectory(), list);
-
- //播放列表進行排序,字符順序
- 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();
-
- //獲取歌曲路徑
- player.setDataSource(data.get(current).get("path"));
-
- //緩沖
- player.prepare();
-
- //開始播放
- player.start();
-
- //顯示歌名
- nameTextView.setText(data.get(current).get("name"));
-
- //設置進度條長度
- seekBar.setMax(player.getDuration());
-
- //播放按鈕樣式
- ppButton.setText("||");
-
- //發送一個Runnable, handler收到之後就會執行run()方法
- handler.post(new Runnable() {
- public void run() {
- // 更新進度條狀態
- if (!isStartTrackingTouch)
- seekBar.setProgress(player.getCurrentPosition());
- // 1秒之後再次發送
- handler.postDelayed(this, 1000);
- }
- });
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
-
- /**
- * 查找文件路徑中所有mp3文件
- * @param file 要找的目錄
- * @param list 用來裝文件的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())//如果是目錄
- findAll(subFile, list); //遞歸
- }
- }
-
- /*
- * 暫停/播放按鈕
- */
- public void pp(View view) {
-
- //默認從第一首歌曲開始播放
- if (!player.isPlaying() && !isPause) {
- play();
- return;
- }
-
- Button button = (Button) view;
- //暫停/播放按鈕
- if ("||".equals(button.getText())) {
- pause();
- button.setText("▶");
- } else {
- resume();
- button.setText("||");
- }
- }
-
- /*
- * 開始操作
- */
- private void resume() {
- if (isPause) {
- player.start();
- isPause = false;
- }
- }
-
- /*
- * 暫停操作
- */
- private void pause() {
- if (player != null && player.isPlaying()) {
- player.pause();
- isPause = true;
- }
- }
-
- /*
- * 收到廣播時暫停
- */
- private final class PhoneListener extends BroadcastReceiver {
- public void onReceive(Context context, Intent intent) {
- pause();
- }
- }
-
- /*
- * 恢復播放
- * @see android.app.Activity#onResume()
- */
- protected void onResume() {
- super.onResume();
- resume();
- }
- }
注冊權限:
- <?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" />
-
- <!-- 監聽電話呼出 -->
- <uses-permission android:name="android.permission.PROCESS_OUTGOING_CALLS"/>
- <!-- 監聽電話狀態改變 -->
- <uses-permission android:name="android.permission.READ_PHONE_STATE" />
-
- </manifest>