Android 多媒体播放API简介

本文调用android的媒体播放器实现一些音乐播放操作

项目布局:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/et_path"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="请输入音乐文件的路径" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/bt_play"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="播放" />

        <Button
            android:id="@+id/bt_pause"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="暂停" />

        <Button
            android:id="@+id/bt_replay"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="重播" />

        <Button
            android:id="@+id/bt_stop"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:text="停止" />
    </LinearLayout>

</LinearLayout>

可以查看本地sdk中的文件查看相关api

file:///……/sdk/docs/guide/topics/media/mediaplayer.html

本文地址:http://www.cnblogs.com/wuyudong/p/5679191.html,转载请注明源地址。

相关逻辑部分代码如下:

package com.wuyudong.mp3player;

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

import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.net.Uri;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

    private EditText et_path;
    private Button bt_play, bt_replay, bt_pause, bt_stop;

    private MediaPlayer mediaPlayer;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        et_path = (EditText) findViewById(R.id.et_path);
        bt_play = (Button) findViewById(R.id.bt_play);
        bt_replay = (Button) findViewById(R.id.bt_replay);
        bt_pause = (Button) findViewById(R.id.bt_pause);
        bt_stop = (Button) findViewById(R.id.bt_stop);

        bt_pause.setOnClickListener(this);
        bt_play.setOnClickListener(this);
        bt_replay.setOnClickListener(this);
        bt_stop.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.bt_play:
            play();
            break;
        case R.id.bt_replay:
            replay();
            break;
        case R.id.bt_stop:
            stop();
            break;
        case R.id.bt_pause:
            pause();
            break;
        default:
            break;
        }
    }

    /**
     * 暂停音乐
     */
    private void pause() {
        if ("继续".equals(bt_pause.getText().toString().trim())) {
            mediaPlayer.start();
            bt_pause.setText("暂停");
            return;
        }
        if (mediaPlayer != null && mediaPlayer.isPlaying()) {
            mediaPlayer.pause();
            bt_pause.setText("继续");
            return;
        }
    }

    /**
     * 重新播放
     */
    private void replay() {
        if (mediaPlayer != null && mediaPlayer.isPlaying()) {
            mediaPlayer.seekTo(0);
            return;
        }
        play();
    }

    /**
     * 停止播放音乐
     */
    private void stop() {
        if (mediaPlayer != null && mediaPlayer.isPlaying()) {
            mediaPlayer.stop();
            mediaPlayer.release(); // 记得释放资源
            mediaPlayer = null;
            bt_play.setEnabled(true);
        }
    }

    /**
     * 播放音乐
     */
    private void play() {
        String path = et_path.getText().toString().trim();
        File file = new File(path);
        if (file.exists() && file.length() > 0) {
            try {
                mediaPlayer = new MediaPlayer();
                mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                mediaPlayer.setDataSource(path);
                mediaPlayer.prepare(); // might take long! (for buffering, etc)
                mediaPlayer.start();
                mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
                    @Override
                    public void onCompletion(MediaPlayer mp) {
                        bt_play.setEnabled(true);
                    }
                } );
                
                bt_play.setEnabled(false);
            } catch (Exception e) {
                Toast.makeText(this, "播放失败", 0).show();
                e.printStackTrace();
            }
        } else {
            Toast.makeText(this, "文件不存在", 0).show();
        }

    }

}

在执行代码之前先上传一份音频文件到sdcard

最后运行项目实现的效果如下:

posted @ 2016-09-07 17:01  wuyudong  阅读(1124)  评论(1编辑  收藏  举报
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