Android学习笔记_25_多媒体之在线播放器

来源：互联网发布：幸运大转盘抽奖软件编辑：程序博客网时间：2024/04/24 04:11

一、布局文件：

<?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:background="#FFFFFF"    android:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="@string/filename" />    <EditText        android:id="@+id/filename"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:text="11.RMVB" />    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:orientation="horizontal" >        <ImageButton            android:id="@+id/play"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@drawable/play" />        <ImageButton            android:id="@+id/pause"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@drawable/pause" />        <ImageButton            android:id="@+id/reset"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@drawable/reset" />        <ImageButton            android:id="@+id/stop"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:src="@drawable/stop" />    </LinearLayout>    <SurfaceView        android:id="@+id/surfaceView"        android:layout_width="fill_parent"        android:layout_height="240dip" /></LinearLayout>

View Code

二、代码实现：

package com.example.video;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import android.R.integer;import android.app.Activity;import android.media.AudioManager;import android.media.MediaPlayer;import android.media.MediaPlayer.OnPreparedListener;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.widget.EditText;import android.widget.ImageButton;import android.widget.Toast;public class MainActivity extends Activity {    private static final String TAG = "VideoActivity";    private EditText filenameText;    private SurfaceView surfaceView;    private MediaPlayer mediaPlayer;    private String filename;// 当前播放文件的名称    private int position;// 记录播放位置    private boolean pause=false;//是否被暂停    private  File file;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        this.mediaPlayer = new MediaPlayer();        this.filenameText = (EditText) this.findViewById(R.id.filename);        this.surfaceView = (SurfaceView) this.findViewById(R.id.surfaceView);        ImageButton playButton = (ImageButton) this.findViewById(R.id.play);        ImageButton pauseButton = (ImageButton) this.findViewById(R.id.pause);        ImageButton resetButton = (ImageButton) this.findViewById(R.id.reset);        ImageButton stopButton = (ImageButton) this.findViewById(R.id.stop);        ButtonClickListener listener = new ButtonClickListener();        playButton.setOnClickListener(listener);        pauseButton.setOnClickListener(listener);        resetButton.setOnClickListener(listener);        stopButton.setOnClickListener(listener);        /* 下面设置Surface不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送到用户面前 */        this.surfaceView.getHolder().setType(                SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);        this.surfaceView.getHolder().setFixedSize(176, 144);// 设置分辨率        //让屏幕高亮，不要锁频        this.surfaceView.getHolder().setKeepScreenOn(true);        this.surfaceView.getHolder().addCallback(new SurfaceListener());    }    private class ButtonClickListener implements View.OnClickListener {        @Override        public void onClick(View v) {            try {                switch (v.getId()) {                case R.id.play:// 来自播放按钮                    filename = filenameText.getText().toString();                    file=new File("/storage/sdcard0/Music",filename);                    if (file.exists()) {                                                play(0);                    }else {                        Toast.makeText(getApplicationContext(), "文件不存在", Toast.LENGTH_LONG).show();                    }                    break;                case R.id.pause:// 来自暂停按钮                    if (mediaPlayer.isPlaying()) {                        mediaPlayer.pause();                        pause=true;                    } else {                        if (pause) {                            mediaPlayer.start();                            pause=false;                        }                    }                    break;                case R.id.reset:// 来自重新播放按钮                    if (mediaPlayer.isPlaying()) {                        mediaPlayer.seekTo(0);                    }else {                        if(file!=null){                            play(0);                        }                    }                    break;                case R.id.stop:// 来自停止按钮                    if (mediaPlayer.isPlaying())                        mediaPlayer.stop();                    break;                }            } catch (Exception e) {                Log.e(TAG, e.toString());            }        }    }    /**     * 播放视频     */    private void play(int position) throws IOException {        mediaPlayer.reset();        //mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);        mediaPlayer.setDataSource(file.getAbsolutePath());// 设置需要播放的视频        mediaPlayer.setDisplay(surfaceView.getHolder());// 把视频画面输出到SurfaceView        mediaPlayer.prepare();//进行缓冲处理，完成之后播放        mediaPlayer.setOnPreparedListener(new PrepareListener(position));            }    private final class PrepareListener implements OnPreparedListener{        private int position;        public PrepareListener(int position) {            this.position=position;        }        //当缓冲完成之后就会调用onPrepared方法        @Override        public void onPrepared(MediaPlayer mp) {            mediaPlayer.start();//播放            if (position>0) {                mediaPlayer.seekTo(position);            }        }    }    private class SurfaceListener implements SurfaceHolder.Callback {        @Override        public void surfaceChanged(SurfaceHolder holder, int format, int width,                int height) {        }        //当画面再次回到前台时调用        @Override        public void surfaceCreated(SurfaceHolder holder) {// 方法在onResume()后被调用            Log.i(TAG, "surfaceCreated()");            if (position > 0 && filename != null) {                try {                    play(position);                    position = 0;                } catch (Exception e) {                    Log.e(TAG, e.toString());                }            }        }        @Override        public void surfaceDestroyed(SurfaceHolder holder) {            if (mediaPlayer.isPlaying()) {                position = mediaPlayer.getCurrentPosition();// 得到播放位置                mediaPlayer.stop();            }            Log.i(TAG, "surfaceDestroyed()");        }    }    @Override    protected void onDestroy() {        if (mediaPlayer.isPlaying())            mediaPlayer.stop();        mediaPlayer.release();        super.onDestroy();    }        @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.main, menu);        return true;    }}

0 0