VideoView与SurfaceView的使用

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>
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package 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(<
cc83
span class="hljs-keyword">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();
}
});
}
}