實現一個android的音樂播放器

實現功能，播放，暫停，重置，進度條的使用

String文件：

<?xmlversion="1.0"encoding="utf-8"?>
<resources>

    <stringname="app_name">MusicPlayer</string>
    <stringname="music_name">歌曲：</string>
    <stringname="play_text">播放</string>
    <stringname="pause_text">暫停</string>
    <stringname="continue_text">繼續</string>
    <stringname="reset_text">重置</string>
    <stringname="stop_text">關閉</string>
    <stringname="notfoundfile_text">媒體文件不存在</string>
    <stringname="notfoundSdcard_text">SDCard不存在</string>

</resources>

<?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">MusicPlayer</string> <string name="music_name">歌曲：</string> <string name="play_text">播放</string> <string name="pause_text">暫停</string> <string name="continue_text">繼續</string> <string name="reset_text">重置</string> <string name="stop_text">關閉</string> <string name="notfoundfile_text">媒體文件不存在</string> <string name="notfoundSdcard_text">SDCard不存在</string> </resources>

 

佈局：

<?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"
/>

    <EditText
        android:id="@+id/musicEt"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="a.mp3"
         />
    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="10000"
         />
    <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/resetBtn"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/reset_text"
/>

            <Button
                android:id="@+id/stopBtn"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/stop_text"
/>
        </TableRow>
    </TableLayout>
</LinearLayout>

<?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" /> <EditText android:id="@+id/musicEt" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="a.mp3" /> <SeekBar android:id="@+id/seekBar" android:layout_width="match_parent" android:layout_height="wrap_content" android:max="10000" /> <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/resetBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/reset_text" /> <Button android:id="@+id/stopBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/stop_text" /> </TableRow> </TableLayout> </LinearLayout>

Java源碼：

package cn.class3g.musicplayer;

import java.io.File;
import java.io.IOException;

import android.app.Activity;

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.Toast;

public class MusicPlayerActivity
extends Activity implements OnClickListener,
        OnSeekBarChangeListener {

    private static
final String TAG = "MusicPlayerActivity";
    EditText musicEt;
    Button playBtn, pauseBtn, resetBtn, stopBtn;
    Handler handler = null;
    Handler fHandler = null;
    MediaPlayer player = null;

    SeekBar seekbar = null;

    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);
        resetBtn = (Button) this.findViewById(R.id.resetBtn);
        stopBtn = (Button) this.findViewById(R.id.stopBtn);
        seekbar = (SeekBar) this.findViewById(R.id.seekBar);
        playBtn.setOnClickListener(this);
        pauseBtn.setOnClickListener(this);
        resetBtn.setOnClickListener(this);
        stopBtn.setOnClickListener(this);
        seekbar.setOnSeekBarChangeListener(this);
    }

    public void onClick(View v) {
        String fileName = musicEt.getText().toString();

        // 確定sdcard狀態是否爲已加載
        if (Environment.getExternalStorageState().equals(
                Environment.MEDIA_MOUNTED)) {
            File file = new File(Environment.getExternalStorageDirectory(),
                    fileName);

            // 判斷所播放的媒體文件是否存在
            if (file.exists()) {

                try {
                    switch (v.getId()) {
                    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.resetBtn:
                        if (player.isPlaying()) {
                            player.seekTo(0);
                        } else {
                            playMusic(file);
                        }
                        break;
                    case R.id.stopBtn:
                        if (player.isPlaying()) {
                            player.stop();
                        }
                        break;
                    }
                } catch (Exception e) {
                    Log.e(TAG, e.toString());
                }
            } else {
                Toast.makeText(this, R.string.notfoundfile_text,
                        Toast.LENGTH_SHORT).show();
            }
        } else {
            Toast.makeText(this, R.string.notfoundSdcard_text,
                    Toast.LENGTH_SHORT).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();
    }

    protected void onResume() {
        if (player != 
null) {
            if (!player.isPlaying()) {
                player.start();
            }
        }
        super.onResume();
    }

    private void playMusic(File file)
throws IllegalArgumentException,
            IllegalStateException, IOException {
        if (player != 
null) {
            player.reset();
            player.setDataSource(file.getAbsolutePath());
            player.prepare();
            player.start();

            seekbar.setMax(player.getDuration());
            Log.i(TAG, String.valueOf(player.getDuration()));

            new Thread(new seekBar()).start();
        }
    }

    class seekBar implements Runnable {

        int position = 0;

        public void run() {
            while (player !=
null) {
                position = player.getCurrentPosition();
                seekbar.setProgress(position);

                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    Log.e(TAG, e.toString());
                }
            }

        }

    }

    public void onProgressChanged(SeekBar seekBar,
int progress,
            boolean fromUser) {
        if (fromUser)
            player.seekTo(progress);
    }

    public void onStartTrackingTouch(SeekBar seekBar) {

    }

    public void onStopTrackingTouch(SeekBar seekBar) {

    }
}