Android录像和拍照功能实例

本文实例为大家讲解如何轻松实现Android手机拍照和录像功能，分享给大家供大家参考。具体如下：

要实现录像和拍照的功能，首先我们在 manifest 里添加权限，以免后面忘记添加 

一个简单的页面布局photo.xml

Video2Activity.java

package com.pxd.mediaplayer;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Toast;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * Created by Administrator on 2017/2/14.
 */

public class Video2Activity extends AppCompatActivity {

    private SurfaceView sv_main_surface;
    private Camera camera;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.photo);
        sv_main_surface = (SurfaceView) findViewById(R.id.sv_main_surface);
        sv_main_surface.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                //打开照相机
                camera = Camera.open();
                //设置参数
                Camera.Parameters parameters=camera.getParameters();
                parameters.setPictureFormat(PixelFormat.JPEG);
                parameters.set("jpeg-quality",85);
                camera.setParameters(parameters);
                //将画面展示到SurfaceView
                try {
                    camera.setPreviewDisplay(sv_main_surface.getHolder());
                } catch (IOException e) {
                    e.printStackTrace();
                }
                //开启预览效果
                camera.startPreview();

            }
            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

            }
            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                if(camera!=null){
                    camera.stopPreview();
                    camera.release();
                    camera=null;
                }
            }
        });
    }
    public void takePhoto(View view){
    camera.takePicture(null, null, new Camera.PictureCallback() {
        @Override
        public void onPictureTaken(byte[] data, Camera camera) {
            //技术：
         Bitmap bitmap= BitmapFactory.decodeByteArray(data,0,data.length);
            try {
                FileOutputStream fos=new FileOutputStream(Environment.getExternalStorageDirectory().getAbsolutePath()+"/images/"+System.currentTimeMillis()+".png");
              bitmap.compress(Bitmap.CompressFormat.PNG,85,fos);
                Toast.makeText(Video2Activity.this, "拍摄成功", Toast.LENGTH_SHORT).show();
                camera.stopPreview();
                 camera.startPreview();
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }

        }
    });
    }
}

以上代码实现的是拍照的功能。

实现录像功能思路

*Android实现录像主要依靠MediaRecorder和SurfaceView这两个类。另外，因为需要对摄像头参数做一些设定，所以也需要Camera类。它们的作用分别是：MediaRecorder通过控制录像音视频源和输出编码等；surfaceview则是作为View的存在提供用户界面，在surfaceview的不同生命周期实现不同的操作；camera类则用于对摄像头参数做一些设定，再调用MediaRecorder的setCamera() 方法将camera对象带入。

在这里给出自己的一个测试demo：

布局videoxml

MediaRecoderActivity.java

package com.pxd.mediaplayer;

import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Toast;

import java.io.IOException;

/**
 * Created by Administrator on 2017/2/15.
 */
public class MediaRecorderActivity extends AppCompatActivity {

    private SurfaceView sv_recorder_surface;
    private MediaRecorder mediaRecorder;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.video);
        sv_recorder_surface = (SurfaceView) findViewById(R.id.sv_recorder_surface);
    //实例化媒体录制器
        mediaRecorder = new MediaRecorder();
    }

     public void start(View view) {
         mediaRecorder.reset();
         //从照相机采集视频
         mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
         mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        //设置格式
         mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
         mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263);
         mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
         //设置保存路径
         mediaRecorder.setOutputFile(Environment.getExternalStorageDirectory().getAbsolutePath()+"/Movies/"+System.currentTimeMillis()+".mp4");
         mediaRecorder.setPreviewDisplay(sv_recorder_surface.getHolder().getSurface());
         try {
             //预期准备
             mediaRecorder.prepare();
             //开始刻录
             mediaRecorder.start();
         } catch (IOException e) {
             e.printStackTrace();
         }
     }
    public void stop(View view) {
    if(mediaRecorder!=null){
        mediaRecorder.stop();
        //停止刻录
        mediaRecorder.release();
        Toast.makeText(this, "录制成功", Toast.LENGTH_SHORT).show();
        mediaRecorder=null;
        }

    }
}