• 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:

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  • 原文地址:https://www.cnblogs.com/wuyudong/p/5850115.html
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