Android成长之路-音乐播放器的实现(转)?strings.xml?xml?version1.0?encodingutf-8???resources
Android成长之路-音乐播放器的实现(转)
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strings.xml
<?xml?version="1.0"?encoding="utf-8"?>??<resources>????????<string?name="app_name">MusicPlayer</string>??????<string?name="music_name">曲目</string>??????<string?name="play_text">播放</string>??????<string?name="pause_text">暂停</string>??????<string?name="continue_text">继续</string>??????<string?name="reset_text">重置</string>??????<string?name="stop_text">停止</string>??????<string?name="choose_text">选择</string>??????<string?name="notfoundfile_text">媒体文件不存在</string>??????<string?name="notfoundSdcard_text">SDcard不存在</string>????</resources>???
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main.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="fill_parent"??????android:orientation="vertical"?>????????<TextView??????????android:layout_width="fill_parent"??????????android:layout_height="wrap_content"??????????android:text="@string/music_name"?/>????????<TableLayout???????????android:layout_width="fill_parent"??????????android:layout_height="wrap_content"??????????android:stretchColumns="0"?>????????????<TableRow?>??????????<EditText??????????????android:id="@+id/musicEt"??????????????android:layout_width="fill_parent"??????????????android:layout_height="wrap_content"??????????????android:text="l.mp3"?/>????????????<Button??????????????android:id="@+id/chooseBtn"??????????????android:layout_width="wrap_content"??????????????android:layout_height="wrap_content"??????????????android:text="@string/choose_text"?/>????????????????????</TableRow>??????</TableLayout>????????<SeekBar??????????android:id="@+id/seekBar"??????????android:layout_width="fill_parent"??????????android:layout_height="wrap_content"?/>??????<SeekBar??????????android:id="@+id/seekBarSound"?????????android:layout_width="fill_parent"??????????android:layout_height="wrap_content"????????????????android:max="100"?????????????????android:progress="10"/>??????????????????/>????????????<TextView??????????android:id="@+id/time"???????????android:layout_width="fill_parent"??????????android:layout_height="wrap_content"??????????/>????????<TableLayout??????????android:layout_width="fill_parent"??????????android:layout_height="wrap_content"??????????android:stretchColumns="*"?>????????????<TableRow?>????????????????<Button??????????????????android:id="@+id/playBtn"??????????????????android:layout_width="wrap_content"??????????????????android:layout_height="wrap_content"??????????????????android:text="@string/play_text"?/>????????????????<Button??????????????????android:id="@+id/pauseBtn"??????????????????android:layout_width="wrap_content"??????????????????android:layout_height="wrap_content"??????????????????android:text="@string/pause_text"?/>????????????????<Button??????????????????android:id="@+id/stopBtn"??????????????????android:layout_width="wrap_content"??????????????????android:layout_height="wrap_content"??????????????????android:text="@string/stop_text"?/>??????????</TableRow>??????</TableLayout>????</LinearLayout>???
MusicPlayerActivity.java
package?cn.csdn.playle;????import?java.io.File;??import?java.io.IOException;????import?android.app.Activity;??import?android.content.Context;??import?android.content.Intent;??import?android.media.AudioManager;??import?android.media.MediaPlayer;??import?android.os.Bundle;??import?android.os.Environment;??import?android.os.Handler;??import?android.util.Log;??import?android.view.View;??import?android.view.View.OnClickListener;??import?android.widget.Button;??import?android.widget.EditText;??import?android.widget.SeekBar;??import?android.widget.SeekBar.OnSeekBarChangeListener;??import?android.widget.TextView;??import?android.widget.Toast;????public?class?MusicPlayerActivity?extends?Activity?implements?OnClickListener,??????????OnSeekBarChangeListener?{????????EditText?musicEt;??????Button?playBtn,?pauseBtn,?stopBtn,?chooseBtn;??????TextView?time;??????AudioManager?audiomanage;??????int?maxVolume,?currentVolume;??????SeekBar?seekBar,?seekBarSound;??????MediaPlayer?player?=?null;????????File?file?=?null;????????int?position?=?0;??????int?i?=?0;??????Handler?handler?=?new?Handler();??????????public?void?onCreate(Bundle?savedInstanceState)?{??????????super.onCreate(savedInstanceState);??????????setContentView(R.layout.main);????????????player?=?new?MediaPlayer();????????????findViews();??????}????????private?void?findViews()?{??????????musicEt?=?(EditText)?this.findViewById(R.id.musicEt);??????????playBtn?=?(Button)?this.findViewById(R.id.playBtn);??????????pauseBtn?=?(Button)?this.findViewById(R.id.pauseBtn);??????????stopBtn?=?(Button)?this.findViewById(R.id.stopBtn);??????????chooseBtn?=?(Button)?this.findViewById(R.id.chooseBtn);??????????seekBar?=?(SeekBar)?this.findViewById(R.id.seekBar);??????????seekBarSound?=?(SeekBar)?this.findViewById(R.id.seekBarSound);??????????time?=?(TextView)?this.findViewById(R.id.time);??????????????time.setOnClickListener(this);??????????playBtn.setOnClickListener(this);??????????pauseBtn.setOnClickListener(this);??????????stopBtn.setOnClickListener(this);??????????stopBtn.setEnabled(false);??????????pauseBtn.setEnabled(false);????????????seekBar.setOnSeekBarChangeListener(this);????????????chooseBtn.setOnClickListener(new?OnClickListener()?{????????????????public?void?onClick(View?v)?{????????????????????Intent?intent?=?new?Intent(MusicPlayerActivity.this,??????????????????????????MusicListActivity.class);??????????????????startActivity(intent);??????????????}??????????});????????????audiomanage?=?(AudioManager)?getSystemService(Context.AUDIO_SERVICE);??????????maxVolume?=?audiomanage.getStreamMaxVolume(AudioManager.STREAM_MUSIC);?//?获取系统最大音量??????????seekBarSound.setMax(maxVolume);?//?拖动条最高值与系统最大声匹配??????????currentVolume?=?audiomanage.getStreamVolume(AudioManager.STREAM_MUSIC);?//?获取当前值??????????seekBarSound.setProgress(currentVolume);????????????seekBarSound.setOnSeekBarChangeListener(new?OnSeekBarChangeListener()?//?调音监听器??????????????????{??????????????????????public?void?onProgressChanged(SeekBar?arg0,?int?progress,??????????????????????????????boolean?fromUser)?{??????????????????????????audiomanage.setStreamVolume(AudioManager.STREAM_MUSIC,??????????????????????????????????progress,?0);??????????????????????????currentVolume?=?audiomanage??????????????????????????????????.getStreamVolume(AudioManager.STREAM_MUSIC);?//?获取当前值??????????????????????????seekBarSound.setProgress(currentVolume);????????????????????????}????????????????????????public?void?onStartTrackingTouch(SeekBar?seekBar)?{????????????????????????????????????????????????}????????????????????????public?void?onStopTrackingTouch(SeekBar?seekBar)?{????????????????????????????????????????????????}??????????????????});????????????Intent?intent?=?this.getIntent();??????????String?name?=?intent.getStringExtra("name");??????????musicEt.setText(name);??????}????????public?void?onClick(View?v)?{????????????String?fileName?=?musicEt.getText().toString().trim();????????????//?获取sdcard的状态是否已加载?(MEDIA_MOUNTED?加载状态)??????????if?(Environment.getExternalStorageState().equals(??????????????????Environment.MEDIA_MOUNTED))?{??????????????file?=?new?File(Environment.getExternalStorageDirectory(),?fileName);????????????????//?判断所播放的媒体文件是否存在??????????????if?(file.exists())?{????????????????????try?{??????????????????????switch?(v.getId())?{//?返回一个int值????????????????????????case?R.id.playBtn:??????????????????????????playMusic(file);????????????????????????????break;????????????????????????case?R.id.pauseBtn:??????????????????????????if?(player.isPlaying())?{??????????????????????????????player.pause();??????????????????????????????pauseBtn.setText(R.string.continue_text);??????????????????????????}?else?{??????????????????????????????player.start();??????????????????????????????pauseBtn.setText(R.string.pause_text);??????????????????????????}??????????????????????????break;????????????????????????case?R.id.stopBtn:??????????????????????????player.stop();??????????????????????????stopBtn.setEnabled(false);??????????????????????????seekBar.setProgress(0);??????????????????????????if?(playBtn.getText().toString().equals("重置"))?{??????????????????????????????playBtn.setText(R.string.play_text);??????????????????????????}??????????????????????????if?(pauseBtn.getText().toString().equals("继续"))?{??????????????????????????????pauseBtn.setText(R.string.pause_text);??????????????????????????????pauseBtn.setEnabled(false);??????????????????????????}?else?{??????????????????????????????pauseBtn.setEnabled(false);??????????????????????????}????????????????????????????break;????????????????????????}??????????????????}?catch?(IllegalArgumentException?e)?{??????????????????????Log.e("TAG",?e.toString());??????????????????}?catch?(IllegalStateException?e)?{??????????????????????Log.e("TAG",?e.toString());??????????????????}?catch?(IOException?e)?{??????????????????????Log.e("TAG",?e.toString());??????????????????}??????????????}?else?{??????????????????Toast.makeText(this,?R.string.notfoundfile_text,??????????????????????????Toast.LENGTH_LONG).show();??????????????}??????????}????????????else?{??????????????Toast.makeText(this,?R.string.notfoundSdcard_text,??????????????????????Toast.LENGTH_LONG).show();??????????}??????}????????protected?void?onDestroy()?{??????????if?(player?!=?null)?{??????????????if?(player.isPlaying())?{??????????????????player.stop();??????????????}??????????????player.release();??????????}??????????super.onDestroy();??????}????????protected?void?onPause()?{??????????if?(player?!=?null)?{??????????????if?(player.isPlaying())?{??????????????????player.pause();??????????????}??????????}??????????super.onPause();??????}????????private?void?playMusic(File?file)?throws?IllegalStateException,?IOException?{????????????if?(musicEt.getText().toString()?==?null??????????????????||?"".equals(musicEt.getText().toString()))?{??????????????Toast.makeText(this,?"没有选中歌曲",?Toast.LENGTH_LONG).show();??????????}?else?{??????????????if?(player?!=?null)?{??????????????????pauseBtn.setEnabled(true);????????????????????player.reset();??????????????????player.setDataSource(file.getAbsolutePath());??????????????????player.prepare();??????????????????player.start();??????????????????playBtn.setText(R.string.reset_text);??????????????????run();??????????????}??????????????if?(playBtn.getText().toString().equals("重置"))?{??????????????????pauseBtn.setEnabled(true);??????????????????stopBtn.setEnabled(true);????????????????}??????????????if?(pauseBtn.getText().toString().equals("继续"))?{??????????????????pauseBtn.setText(R.string.pause_text);??????????????}????????????}??????}????????private?void?run()?{??????????new?Thread(new?Runnable()?{??????????????public?void?run()?{??????????????????while?(player?!=?null)?{??????????????????????int?TIME?=?player.getDuration();??????????????????????seekBar.setMax(TIME);//?获取歌曲的最大值??????????????????????position?=?player.getCurrentPosition();//?返回当前播放进度值??????????????????????seekBar.setProgress(position);????????????????????????try?{??????????????????????????Thread.sleep(3000);??????????????????????}?catch?(InterruptedException?e)?{??????????????????????????e.printStackTrace();??????????????????????}????????????????????}??????????????}????????????}).start();??????}????????public?void?onProgressChanged(SeekBar?seekBar,?int?progress,??????????????boolean?fromUser)?{????????}????????public?void?onStartTrackingTouch(SeekBar?seekBar)?{????????????player.seekTo(seekBar.getProgress());????????}????????public?void?onStopTrackingTouch(SeekBar?seekBar)?{????????????player.seekTo(seekBar.getProgress());??????}????} 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效果图：
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