自制Android下的播放器（音频来源SD卡上的固定位置）
1、视图介绍：
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2、代码：
package com.android.player;
import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.SystemClock;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
public class Player extends Activity {
?/** Called when the activity is first created. */
?@Override
?public void onCreate(Bundle savedInstanceState) {
??super.onCreate(savedInstanceState);
??setContentView(R.layout.main);
??playerTitle_ = (TextView) findViewById(R.id.playertitle);
??playerdurationText_ = (TextView) findViewById(R.id.playerdurationText);
??playControlBtn_ = (ImageButton) findViewById(R.id.playcontrolBtn);
??playControlBtn_.setOnClickListener(new playControlListener());
??playControlBtn_.setImageResource(android.R.drawable.ic_media_play);
??previousBtn_ = (ImageButton) findViewById(R.id.playpreviousfileBtn);
??previousBtn_.setOnClickListener(new PreviousBtnOnClickListener());
??previousBtn_.setEnabled(false);
??nextBtn_ = (ImageButton) findViewById(R.id.playnextfileBtn);
??nextBtn_.setOnClickListener(new NextBtnOnClickListener());
??palyprogressBar_ = (ProgressBar) findViewById(R.id.playProgressBar);
??palyprogressBar_.setMax(100);
??palyprogressBar_.setProgress(0);
??fileName_ = GetFiles(filePath_);
??playerFileList_ = (ListView) findViewById(R.id.playerfileList);
??playerFileList_.setAdapter(new ArrayAdapter<String>(this,
????android.R.layout.simple_list_item_1, fileName_));
??playerFileList_
????.setOnItemClickListener(new FileListOnItemClickListener());
?}
?class playControlListener implements OnClickListener {
??@Override
??public void onClick(View v) {
???// TODO Auto-generated method stub
???if (playState_ == stop) {
????Log.v("test", "player start!!");
????currentfile_ = 0;
????playerStart();
???} else if (playState_ == pause) {
????Log.v("test", "player Restart!!");
????playerRestart();
???} else if (playState_ == playing) {
????Log.v("test", "player pause!!");
????playerPause();
???}
??}
?}
?class PreviousBtnOnClickListener implements OnClickListener {
??@Override
??public void onClick(View v) {
???// TODO Auto-generated method stub
???currentfile_ -= 1;
???playerStop();
???playerStart();
??}
?}
?class NextBtnOnClickListener implements OnClickListener {
??@Override
??public void onClick(View v) {
???// TODO Auto-generated method stub
???currentfile_ += 1;
???playerStop();
???playerStart();
??}
?}
?class MyOnCompletionListener implements OnCompletionListener {
??@Override
??public void onCompletion(MediaPlayer arg0) {
???// TODO Auto-generated method stub
???currentfile_ += 1;
???playerStop();
???playerStart();
??}
?}
?class FileListOnItemClickListener implements OnItemClickListener {
??@Override
??public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
????long arg3) {
???// TODO Auto-generated method stub
???currentfile_ = arg2;
???playerStop();
???playerStart();
??}
?}
?class ProgressBarThread extends Thread {
??public void run() {
???myHandler.post(new Runnable() {
????@Override
????public void run() {
?????// TODO Auto-generated method stub
?????playerTitle_.setText(fileName_[currentfile_]);
????}
???});
???palyprogressBar_.setProgress(0);
???palyprogressBar_.setMax(fileDuration_);
???int current_ = 0;
???while (playState_ != stop) {
????palyprogressBar_.setProgress(current_);
????current_ = mp_.getCurrentPosition() / 1000;
????durationText_.delete(0, durationText_.length());
????if ((current_ / 60) < 10) {
?????durationText_.append(0);
????}
????durationText_.append(current_ / 60);
????durationText_.append(":");
????if ((current_ % 60) < 10) {
?????durationText_.append(0);
????}
????durationText_.append(current_ % 60);
????durationText_.append("/");
????if ((fileDuration_ / 60) < 10) {
?????durationText_.append(0);
????}
????durationText_.append(fileDuration_ / 60);
????durationText_.append(":");
????if ((fileDuration_ % 60) < 10) {
?????durationText_.append(0);
????}
????durationText_.append(fileDuration_ % 60);
????myHandler.post(new Runnable() {
?????@Override
?????public void run() {
??????// TODO Auto-generated method stub
??????playerdurationText_.setText(durationText_.toString());
?????}
????});
????SystemClock.sleep(100);
???}
??}
?}
?void playerRestart() {
??playState_ = playing;
??playControlBtn_.setImageResource(android.R.drawable.ic_media_pause);
??if (mp_ != null) {
???mp_.start();
??}
?}
?void playerStart() {
??if (currentfile_ == 0) {
???previousBtn_.setEnabled(false);
??} else {
???previousBtn_.setEnabled(true);
??}
??if (currentfile_ == fileName_.length - 1) {
???nextBtn_.setEnabled(false);
??} else {
???nextBtn_.setEnabled(true);
??}
??playState_ = playing;
??playControlBtn_.setImageResource(android.R.drawable.ic_media_pause);
??mp_ = new MediaPlayer();
??mp_.setOnCompletionListener(new MyOnCompletionListener());
??try {
???mp_.setDataSource(filePath_ + fileName_[currentfile_]);
???mp_.prepare();
???fileDuration_ = mp_.getDuration() / 1000;
???mp_.start();
??} catch (IllegalArgumentException e) {
???// TODO Auto-generated catch block
???e.printStackTrace();
??} catch (IllegalStateException e) {
???// TODO Auto-generated catch block
???e.printStackTrace();
??} catch (IOException e) {
???// TODO Auto-generated catch block
???e.printStackTrace();
??}
??new ProgressBarThread().start();
?}
?void playerPause() {
??playState_ = pause;
??playControlBtn_.setImageResource(android.R.drawable.ic_media_play);
??if (mp_ != null) {
???mp_.pause();
??}
?}
?void playerStop() {
??playState_ = stop;
??playControlBtn_.setImageResource(android.R.drawable.ic_media_play);
??if (mp_ != null) {
???mp_.release();
???mp_ = null;
??}
?}
?@Override
?public boolean onKeyDown(int keyCode, KeyEvent event) {
??// TODO Auto-generated method stub
??if (keyCode == KeyEvent.KEYCODE_BACK) {
???this.playerStop();
??}
??return super.onKeyDown(keyCode, event);
?}
?String[] GetFiles(String path) {
??File dir = new File(path);
??String[] filenames = dir.list(new FilenameFilter() {
???@Override
???public boolean accept(File arg0, String arg1) {
????// TODO Auto-generated method stub
????if (arg1.endsWith("mp3")) {
?????return true;
????}
????return false;
???}
??});
??return filenames;
?}
?TextView playerTitle_;
?TextView playerdurationText_;
?ImageButton playControlBtn_;
?ImageButton previousBtn_, nextBtn_;
?ListView playerFileList_;
?Handler myHandler = new Handler();
?// stop -1
?// playing 0
?// pause 1
?int playState_ = stop;
?static int stop = -1;
?static int playing = 0;
?static int pause = 1;
?MediaPlayer mp_;
?String filePath_ = Environment.getExternalStorageDirectory() + "/music/";
?String[] fileName_;
?int currentfile_ = 0;
?StringBuffer durationText_ = new StringBuffer();
?ProgressBar palyprogressBar_;
?int fileDuration_ = 0;
}
3、布局
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
?android:orientation="vertical" android:layout_width="wrap_content"
?android:layout_height="wrap_content">
?<TextView android:id="@+id/playertitle" android:layout_width="wrap_content"
??android:layout_height="wrap_content">
?</TextView>
?<TextView android:id="@+id/playerdurationText"
??android:layout_width="wrap_content" android:layout_height="wrap_content">
?</TextView>
?<SeekBar android:id="@+id/playProgressBar" style="?android:attr/progressBarStyleHorizontal"
??android:layout_width="fill_parent" android:layout_height="wrap_content">
?</SeekBar>
?<LinearLayout android:orientation="horizontal"
??android:layout_width="fill_parent" android:layout_height="wrap_content">
??<ImageButton android:id="@+id/playpreviousfileBtn"
???style="@android:style/MediaButton.Previous" />
??<ImageButton android:id="@+id/playcontrolBtn" style="@android:style/MediaButton.Play" />
??<ImageButton android:id="@+id/playnextfileBtn" style="@android:style/MediaButton.Next" />
?</LinearLayout>
?<TextView android:text="List:" android:layout_width="fill_parent"
??android:layout_height="wrap_content" android:textSize="20sp"></TextView>
?<ImageView android:layout_width="fill_parent"
??android:layout_height="wrap_content" android:src="@drawable/divider_horizontal_dark_opaque"></ImageView>
?<ListView android:id="@+id/playerfileList"
??android:layout_width="wrap_content" android:layout_height="wrap_content">
?</ListView>
</LinearLayout>
