Android成长之路-音乐播放器的实现(转)

 

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>

 

 

 

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());
    }

}
 
 
效果图：