VideoView与SurfaceView的使用

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VideoView

概述：
这个类其实也是继承了SurfaceView 类，集成度高，开发难度小，只是灵活性差。

通过VideoView播放视频的步骤：

1、在界面布局文件中定义VideoView组件，或在程序中创建VideoView组件

2、调用VideoView的如下两个方法来加载指定的视频

setVidePath(String path):加载path文件代表的视频

setVideoURI(Uri uri)：加载uri所对应的视频

VideoView的使用：
1.1系统方法

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.example.android_playvideo.VideoActivity">    <VideoView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/vv_mian_Video"        /></LinearLayout>1234567891011121314151612345678910111213141516package com.example.android_playvideo;import android.net.Uri;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.MediaController;import android.widget.VideoView;public class VideoActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_video);         VideoView videoView= (VideoView) findViewById(R.id.vv_mian_Video);        videoView.setVideoURI(Uri.parse("file://mnt/sdcard/dcim/camera/VID20170211215528.mp4"));        MediaController mediaController=new MediaController(this);        mediaController.setMediaPlayer(videoView);        videoView.setMediaController(mediaController);    }}

1.2自定义

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"    android:orientation="vertical"    android:layout_height="match_parent" tools:context="com.example.android_playvideo.MainActivity">    <SurfaceView        android:layout_width="match_parent"        android:layout_height="300dp"        android:id="@+id/sfv_mian_surface"        />    <SeekBar        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:id="@+id/sb_mian_seekbar"        />    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="开始"        android:onClick="start"        /></LinearLayout>

package com.example.android_playvideo;import android.media.AudioManager;import android.media.MediaPlayer;import android.net.Uri;import android.os.Environment;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Log;import android.view.SurfaceView;import android.view.View;import android.widget.SeekBar;import java.io.IOException;public class MainActivity extends AppCompatActivity {    private SeekBar seekBar;    private SurfaceView surfaceView;    private MediaPlayer mediaPlayer;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        seekBar = (SeekBar) findViewById(R.id.sb_mian_seekbar);        surfaceView = (SurfaceView) findViewById(R.id.sfv_mian_surface);        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {            @Override            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {            }            @Override            public void onStartTrackingTouch(SeekBar seekBar) {            }            @Override            public void onStopTrackingTouch(SeekBar seekBar) {                mediaPlayer.seekTo(seekBar.getProgress());            }        });    }    public void start(View view){        if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){        if(mediaPlayer==null){         String path=   Environment.getExternalStorageDirectory().getAbsolutePath();            Log.i("text",""+path);            mediaPlayer = new MediaPlayer();            mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);            try {                mediaPlayer.setDataSource(this, Uri.parse("file://"+path+"/dcim/camera/VID20170211215528.mp4"));                mediaPlayer.prepare();            } catch (IOException e) {                e.printStackTrace();            }            mediaPlayer.setDisplay(surfaceView.getHolder());             int itme=  mediaPlayer.getDuration();            Log.i("text",""+itme);            seekBar.setMax(itme);            mediaPlayer.start();            new mySeekbar().start();        }else if(mediaPlayer.isPlaying()){            mediaPlayer.pause();        }else{            mediaPlayer.start();        }        }    }    class mySeekbar extends  Thread{        @Override        public void run() {            while(seekBar.getProgress()<seekBar.getMax()){                seekBar.setProgress(mediaPlayer.getCurrentPosition());            }        }    }}

配置xml:

 <!--读取内存条的权限-->      <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>      <!--设置照相机的权限-->      <uses-permission android:name="android.permission.CAMERA"></uses-permission>      <!--创建文件的权限-->      <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>      <!--写到内存条的权限-->      <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

SurfaceView:

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    tools:context="com.example.android_playvideo.CameraActivity">    <SurfaceView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:id="@+id/sfv_mian_View"        />    <Button        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="拍照"        android:onClick="paizhao"        /></RelativeLayout>

package com.example.android_playvideo;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.hardware.Camera;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.util.Calendar;public class CameraActivity extends AppCompatActivity {    private SurfaceView surfaceView;    private Camera camera;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_camera);        surfaceView = (SurfaceView) findViewById(R.id.sfv_mian_View);        surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {            @Override            public void surfaceCreated(SurfaceHolder holder) {                //打开摄像头             camera=  Camera.open();                //设置摄像头的参数               /* Camera.Parameters parameters=camera.getParameters();                parameters.setPictureFormat(PixelFormat.JPEG);                parameters.set("jpeg-quality",100);                camera.setParameters(parameters);*/                //开启预览效果                camera.startPreview();                //将画面展示到surfaceView                try {                    camera.setPreviewDisplay(surfaceView.getHolder());                } catch (IOException e) {                    e.printStackTrace();                }            }            @Override            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {            }            @Override            public void surfaceDestroyed(SurfaceHolder holder) {                camera.stopPreview();                camera.release();            }        });    }    public void paizhao(View view){        camera.takePicture(null, null, new Camera.PictureCallback() {            @Override            public void onPictureTaken(byte[] data, Camera camera) {              Bitmap bitmap= BitmapFactory.decodeByteArray(data,0,data.length);                Calendar calendar= Calendar.getInstance();              int year=  calendar.get(Calendar.YEAR);              int month=  calendar.get(Calendar.MONTH);              int day= calendar.get(Calendar.DAY_OF_MONTH);                try {                    FileOutputStream fos=new FileOutputStream("/mnt/sdcard/dcim/camera/G160628_"+year+(month+1)+day+"_"+System.currentTimeMillis()+".jpg");//保存路径                    //压缩                    bitmap.compress(Bitmap.CompressFormat.JPEG,100,fos);                } catch (FileNotFoundException e) {                    e.printStackTrace();                }                camera.stopPreview();                camera.startPreview();            }        });    }}

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