多媒体之视频播放、拍照

最新推荐文章于 2024-08-01 12:33:02 发布

name_Fay

最新推荐文章于 2024-08-01 12:33:02 发布

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本文链接：https://blog.youkuaiyun.com/name_Fay/article/details/75674764

使用MediaPlayer+Surface来播放视频：

界面代码:

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayoutL
    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.woks0721.MainActivity">
    <SurfaceView
        android:layout_width="match_parent"
        android:layout_height="400dp"
        android:id="@+id/sv_main_surface"
        />
    <SeekBar
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/sb_main_bar"
        />

    <ImageButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@android:drawable/ic_media_play"
        android:onClick="playOrPause"
        />
</LinearLayoutL>

Mainactivity.java:

package com.example.woks0721;
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.view.SurfaceView;
import android.view.View;
import android.widget.ImageButton;
import android.widget.SeekBar;

import java.io.IOException;

public class MainActivity extends AppCompatActivity {
    private MediaPlayer mediaPlayer;
    private SeekBar sb_main_bar;
    private SurfaceView sv_main_surface;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        sb_main_bar = (SeekBar) findViewById(R.id.sb_main_bar);
        sv_main_surface = (SurfaceView) findViewById(R.id.sv_main_surface);

        //给进度条设置滑动监听
        sb_main_bar.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) {
                //获取当前进度条的位置
                int currentPosition=seekBar.getProgress();
                //跳转到某个位置进行播放
                mediaPlayer.seekTo(currentPosition);
            }
        });
    }
    public void playOrPause(View view){
        final ImageButton imageButton= (ImageButton) view;

        //实例化MediaPlayer
        if(mediaPlayer==null){
            //mediaPlayer = MediaPlayer.create(this, R.raw.s8);
            if(Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
                String sdPath=Environment.getExternalStorageDirectory().getAbsolutePath();

                mediaPlayer=new MediaPlayer();

                //设置音频流的类型
                mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                //设置音源

                try {
                    mediaPlayer.setDataSource(this, Uri.parse("file://"+sdPath+"/dcim/camera/VID_20170717_184535.mp4"));
                    mediaPlayer.prepare();
                    // mediaPlayer.prepareAsync();
                } catch (IOException e) {
                    e.printStackTrace();
                }


                //将画面展示到 SurfaceView上
                mediaPlayer.setDisplay(sv_main_surface.getHolder());

                mediaPlayer.start();
                //暂停图标

                imageButton.setImageResource(android.R.drawable.ic_media_pause);

                //获取视频的播放时间
                int time=mediaPlayer.getDuration();

                //设置进度条的最大值 为视频的播放时间
                sb_main_bar.setMax(time);

                new MyThread().start();
                
            }

        }else if(mediaPlayer.isPlaying()){
            mediaPlayer.pause();
            //播放图标
            imageButton.setImageResource(android.R.drawable.ic_media_play);
        }else{
            mediaPlayer.start();
            //暂停图标
            imageButton.setImageResource(android.R.drawable.ic_media_pause);
        }
    }

    class MyThread extends Thread{
        @Override
        public void run() {
            super.run();
            while(sb_main_bar.getProgress()<sb_main_bar.getMax()){
                //获取音乐当前的播放位置
                int currentPosition=mediaPlayer.getCurrentPosition();
                sb_main_bar.setProgress(currentPosition);
            }
        }
    }

}

使用VideoView来播放视频：

界面很简单，只要用一个VideoView的控件，

activity_video.xml

<?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.woks0721.VideoActivity">
    <VideoView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/vv_video"
        />
</LinearLayout>

后面的代码：

VideoAcitivity.java

package com.example.woks0721;

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);
        //获取VideoView

	VideoView vv_video= (VideoView) findViewById(R.id.vv_video);
       	//设置视频来源，就是视频存放的路径

 	vv_video.setVideoURI(Uri.parse("file://mnt/sdcard/dcim/camera/VID_20170204_221636.mp4"));
        MediaController mediaController=new MediaController(this);

	//把VideoView和MediaController关联起来
        mediaController.setMediaPlayer(vv_video);
        vv_video.setMediaController(mediaController);
    }
}

拍照的实现代码：cameraActivity.java

package com.example.woks0721;

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

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);
        sv_camera_surface.getHolder().addCallback(new SurfaceHolder.Callback() {



            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                //打开摄像头
                camera = Camera.open();
                //设置摄像参数
                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(sv_camera_surface.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 takePhoto(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);
                //时间戳
                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");
                    //压缩
                    bitmap.compress(Bitmap.CompressFormat.JPEG,85,fos);
                    camera.stopPreview();
                    camera.startPreview();
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

activity_acmera.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"
    tools:context="com.example.woks0721.CameraActivity">
    <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>

最重要的是还要注意权限，

因为上面的代码我都写在一个Module里面，所以代码都放在一起了：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.woks0721">

	<!--读取内存卡的权限-->

    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>
    <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">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

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

</manifest>