视频播放与拍照

视频播放的activity_video

<?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"
    android:orientation="vertical">

    <!--专门用来播放视频的控件-->
    <VideoView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/vv_video"/>
</LinearLayout>

VideoActivity.java

package com.zking.administrator.g160628_android28_playvideo;

import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.MediaController;
import android.widget.VideoView;

/**
 * 视频播放
 */
public class VideoActivity extends AppCompatActivity {

    private VideoView vv_video;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_video);
        vv_video = (VideoView) findViewById(R.id.vv_video);
        //视频路径
        vv_video.setVideoURI(Uri.parse("file://mnt/sdcard/dcim/camera/hh.mp4"));
        //控制器(传一个上下文this)
        MediaController mediaController=new MediaController(this);
        mediaController.setMediaPlayer(vv_video);
        //vv_video控件还要设置一个媒体控制器mediaController
        vv_video.setMediaController(mediaController);
    }
}

AndroidManifest.xml

<!--（读）视频播放的权限-->
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

拍照的activity_comera.xml

<?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">

    <SurfaceView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/sv_camera_surface" />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="拍照"
        android:onClick="takePhoto"/>
</RelativeLayout>

CameraActivity.java

package com.zking.administrator.g160628_android28_playvideo;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.icu.util.Calendar;
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.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class CameraActivity extends AppCompatActivity {

    private SurfaceView sv_camera_surface;
    private Camera camera;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_camera);
        sv_camera_surface = (SurfaceView) findViewById(R.id.sv_camera_surface);
        //给surfaceView添加一个回调函数
        sv_camera_surface.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override//画面创建
            public void surfaceCreated(SurfaceHolder holder) {
                //打开照相机（CAMERAID位置）
                //默认打开后置
                camera = Camera.open();
                //设置摄像头参数列表
                Camera.Parameters parameters= camera.getParameters();
                //设置照片的输出格式jpg
                parameters.setPictureFormat(PixelFormat.JPEG);
                //设置照片的质量
                parameters.set("jpeg-quality",100);
                // 给照相机设置参数
                camera.setParameters(parameters);
                //开启预览效果
                camera.startPreview();
                try {
                   //将画面展示到surfaceView控件上
                    camera.setPreviewDisplay(sv_camera_surface.getHolder());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            @Override//画面改变
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

            }

            @Override//画面销毁
            public void surfaceDestroyed(SurfaceHolder holder) {
                //改变摄像头
                camera.stopPreview();
                //释放内存
                camera.release();
            }
        });
    }

    public void takePhoto(View view){
        // 拍照、在takePicture传入三个参
        camera.takePicture(null, null, new Camera.PictureCallback() {
            @Override
            public void onPictureTaken(byte[] data, Camera camera) {
                //图片转码
                Bitmap bitmap=BitmapFactory.decodeByteArray(data,0,data.length);
                //时间戳（年月日时分秒粘在一起）
                Calendar calendar=Calendar.getInstance();
                //年
                int year=calendar.get(Calendar.YEAR);
                //月
                int month=calendar.get(Calendar.MONTH);
                //日
                int day=calendar.get(Calendar.DAY_OF_MONTH);
                //存到内存卡里
                try {
                    FileOutputStream fos=new FileOutputStream("/mnt/sdcard/dcim/camera/G160628_"+year+(month+1)+day+"_"+ System.currentTimeMillis()+".jpg");
                    //图片压缩(这里有三个参，第一个压缩的格式，第二个质量，第三个压缩到那里去)
                    bitmap.compress(Bitmap.CompressFormat.JPEG,85,fos);
                    //拍完一张接着拍
                    camera.stopPreview();//关闭
                    camera.startPreview();//开启
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }

            }
        });
    }
}

AndroidManifest.xml

<!--写的权限-->
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <!--创建文件的权限:创建和删除一个文件系统-->
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>
    <!--照相机的权限-->
    <uses-permission android:name="android.permission.CAMERA"></uses-permission>

Android三种播放视频的方式：http://blog.youkuaiyun.com/itachi85/article/details/7216962