安卓实战演练——Surfaceview视频播放器

代码来源《Android移动开发基础案例教程》

gradle4.6

package name：cn.itcast.surfaceview

先在res中建一个raw包，包中导入vedio.mp4

Androidmanifest代码：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="cn.itcast.surfaceview">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity"
            android:screenOrientation="landscape">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

MainActivity代码：

package cn.itcast.surfaceview;

import android.os.CountDownTimer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.SurfaceView;
import android.view.View;
import android.widget.SeekBar;
import android.view.SurfaceHolder;
import android.widget.RelativeLayout;
import android.media.MediaPlayer;
import android.media.AudioManager;
import android.widget.ImageView;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;
import android.view.Window;
import android.widget.Toast;
import android.content.ContentResolver;
import android.net.Uri;

public class MainActivity extends AppCompatActivity implements
                SeekBar.OnSeekBarChangeListener, SurfaceHolder.Callback {
    private SurfaceView sv;
    private SurfaceHolder holder;
    private MediaPlayer mediaplayer;
    private RelativeLayout rl;
    private Timer timer;
    private TimerTask task;
    private SeekBar sbar;
    private ImageView play;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);//去掉默认标题栏
        setContentView(R.layout.activity_main);
        sv = findViewById(R.id.sv);

        //获取 SurfaceView控件的容器，界面内容显示在容器中
        holder = sv.getHolder();
        //setType ()为过时的方法,Android 4.0版本以上的系统不写没问题,否则必须要写
        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        holder.addCallback(this);
        rl=findViewById(R.id.rl);
        play=findViewById(R.id.play);
        sbar =findViewById(R.id.sbar);
        sbar.setOnSeekBarChangeListener (this);
        timer = new Timer (); //初始化计时器
        task = new TimerTask() {
            @Override
            public void run() {
                if (mediaplayer != null && mediaplayer.isPlaying()) {
                    int total = mediaplayer.getDuration();//获取视频总时长
                    sbar.setMax(total);    //设置视频进度条总时长
                    //获取视频当前进度
                    int progress = mediaplayer.getCurrentPosition();
                    sbar.setProgress(progress);    //将当前进度设置给进度条
                } else {
                    play.setImageResource(android.R.drawable.ic_media_play);
                }
            }
        };
            //设置 tast任务延迟500毫秒执行,每隔500毫秒执行一次 
            //timer.schedule(task,500,500);
    }
    @Override
    public void surfaceCreated (SurfaceHolder holder){    //Surface 创建时触发
            try {
                mediaplayer = new MediaPlayer();
                mediaplayer.setAudioStreamType(AudioManager.STREAM_MUSIC);    //音频类型
                Uri uri = Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE + "://" +
                        getPackageName() + "/" + R.raw.video); //视频路径
                try {
                    //设置视频文件路径
                    mediaplayer.setDataSource(MainActivity.this, uri);
                } catch (IOException e) {
                    Toast.makeText(MainActivity.this, "播放失败",
                            Toast.LENGTH_SHORT).show();
                    e.printStackTrace();
                }
                //SurfaceView控件与MediaPlayer类进行关联
                mediaplayer.setDisplay(holder);
                mediaplayer.prepareAsync();//将视频文件解析到内存中
                mediaplayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
                    @Override
                    public void onPrepared(MediaPlayer mp) {
                        mediaplayer.start(); //播放视频
                    }
                });
            } catch (Exception e) {
                Toast.makeText(MainActivity.this, "播放失败",
                        Toast.LENGTH_SHORT).show();
                e.printStackTrace();
            }
    }
    @Override
    public void surfaceChanged (SurfaceHolder holder, int format, int width,int height){    //Surface 大小发生变化时触发
    }
    @Override
    public void surfaceDestroyed (SurfaceHolder holder){    //Surface 注销时触发
            if (mediaplayer.isPlaying()) { //判断视频是否正在播放
                mediaplayer.stop();    //停止视频
            }
    }
    //播放(暂停)按钮的点击事件
    public void click (View view){
        if (mediaplayer != null && mediaplayer.isPlaying()) { //视频正在播放
            mediaplayer.pause ();  //暂停视频播放
            play.setImageResource(android.R.drawable.ic_media_play);
        } else{
        mediaplayer.start();    //开始视频播放
        play.setImageResource(android.R.drawable.ic_media_pause);
        }
    }
    @Override
    public void onProgressChanged (SeekBar seekBar, int progress, boolean fromUser){}//进度发生变化时触发
    @Override
    public void onStartTrackingTouch (SeekBar seekBar) {    //进度条开始拖动时触发
    }

    @Override
    public void onStopTrackingTouch (SeekBar seekBar) {//进度条停止拖动时触发
        int position = seekBar.getProgress();    //获取进度条当前的拖动位置
        if (mediaplayer != null) {
            mediaplayer.seekTo(position);    //将进度条的拖动位置设置给MediaPlayer对象
        }
    }
    @Override
    public boolean onTouchEvent (MotionEvent event) {  //屏幕触摸事件
        switch (event.getAction()){
            case MotionEvent.ACTION_DOWN:
                if (rl.getVisibility() == View.INVISIBLE){ //不显示进度条和播放按钮
                    rl.setVisibility (View.VISIBLE);   //显示进度条和播放按钮
                    //倒计时3秒，3秒后继续隐藏进度条和播放按钮
                    CountDownTimer cdt = new CountDownTimer(3000,1000) {
                        @Override
                        public void onTick(long millisUntilFinished) {
                            System.out.println(millisUntilFinished);
                        }

                        @Override
                        public void onFinish() {
                            //隐藏进度条和播放按钮
                            rl.setVisibility(View.INVISIBLE);
                        }
                    };
                    cdt.start();   //开启倒计时
                } else if (rl.getVisibility() ==View.VISIBLE){//显示进度条和播放按钮
                    rl.setVisibility(View.INVISIBLE);  //隐藏进度条和播放按钮
                }
                break;
        }
        return super.onTouchEvent(event);
    }
    @Override
    protected void onDestroy(){
        task.cancel();    //将TimerTask从任务队列中清除
        timer.cancel();    //将任务队列中的全部任务清除
        task=null;
        timer=null;    //设置对象 task为null    //设置对象timer为null
        mediaplayer.release();    //释放MediaPlayer对象占用的资源
        mediaplayer=null;    //将对象mediaplayer 设置为null
        super.onDestroy();
    }
}

Activity_main代码

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <SurfaceView
        android:id="@+id/sv"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />
    <RelativeLayout
        android:id="@+id/rl"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <SeekBar
            android:id="@+id/sbar"
            style="?android:attr/progressBarStyleHorizontal"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:max="100"
            android:progress="0" />
        <ImageView
            android:id="@+id/play"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:onClick="click"
            android:src="@android:drawable/ic_media_pause" />
    </RelativeLayout>
</FrameLayout>

运行结果截图：