(Android小应用)音乐播放器

这个小应用确实是小哈，仅做为学习之用，了解MediaPlayer类，以后再做个稍微大点的，打算从网络上直接下载歌曲和歌词文件，并动态显示歌词，这个小应用先不实现那些吧，以后补上……

界面：

<?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:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:text="音乐文件路径"
        />
    <EditText  
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:id="@+id/filename"
        android:text="test.mp3"
        />
     <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        >
        <Button
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:id="@+id/startButton"
            android:text="播放"
            android:textSize="15px"
        />
        <Button
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content"
            android:layout_toRightOf="@id/startButton" 
            android:layout_alignTop="@id/startButton"
            android:layout_marginLeft="10px"
            android:id="@+id/pauseButton"
            android:text="暂停"
            android:textSize="15px"
        />
        <Button
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content" 
            android:layout_toRightOf="@id/pauseButton" 
            android:layout_alignTop="@id/pauseButton"
            android:layout_marginLeft="10px"
            android:id="@+id/stopButton"
            android:text="停止"
            android:textSize="15px"
        />
     </RelativeLayout>
</LinearLayout>

很简单的布局

AudioActivity：

package com.studio.audio;

import java.io.IOException;

import android.app.Activity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class AudioActivity extends Activity {
    /** Called when the activity is first created. */
    private MediaPlayer mediaPlayer = null;
    private Button startButton = null;
    private Button pauseButton = null;
    private Button stopButton = null;
    private EditText editText = null;

    private boolean isPause = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        editText = (EditText) findViewById(R.id.filename);
        startButton = (Button) findViewById(R.id.startButton);
        pauseButton = (Button) findViewById(R.id.pauseButton);
        stopButton = (Button) findViewById(R.id.stopButton);

        startButton.setOnClickListener(listener);
        pauseButton.setOnClickListener(listener);
        stopButton.setOnClickListener(listener);

        mediaPlayer = new MediaPlayer();
        mediaPlayer
                .setOnCompletionListener(new MediaPlayer.OnCompletionListener() {

                    @Override
                    public void onCompletion(MediaPlayer mp) {
                        // TODO Auto-generated method stub
                        Toast.makeText(AudioActivity.this, "播放完成",
                                Toast.LENGTH_LONG).show();
                    }
                });
    }

    private OnClickListener listener = new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Button button = (Button) v;
            switch (button.getId()) {
            case R.id.startButton:
                try {
                    String fileName = editText.getText().toString();
                    mediaPlayer.reset();
                    mediaPlayer.setDataSource("/sdcard/" + fileName);
                    mediaPlayer.prepare();
                    mediaPlayer.start();
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                break;
            case R.id.pauseButton:
                try {
                    if (mediaPlayer.isPlaying()) {
                        mediaPlayer.pause();
                    } else {
                        mediaPlayer.start();
                    }
                } catch (Exception e) {
                    // TODO: handle exception
                }
                break;
            case R.id.stopButton:
                if (mediaPlayer.isPlaying()) {
                    mediaPlayer.stop();
                }
                break;

            default:
                break;
            }
        }
    };

    @Override
    protected void onPause() {
        // TODO Auto-generated method stub
        if (mediaPlayer.isPlaying()) {
            mediaPlayer.pause();
            isPause = true;
        }
        super.onPause();
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        if (isPause) {
            mediaPlayer.start();
            isPause = false;
        }
        super.onResume();
    }

    @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        mediaPlayer.release();
        mediaPlayer = null;
        super.onDestroy();
    }

}

因为我们这里用的sdcard里面的音乐文件，所以我们得先往sdcard里面放首音乐

选择“sdcard",然后点击右上角第二个手机图标（指向手机里面的那个）就可以将本地的文件传到sdcard里面，注意名字的关联，因为程序里面定义的名字是test.mp3，呵呵，本来功能就不复杂的，仅作为学习之用