android 拍照及录短视频---练习

最新推荐文章于 2017-05-30 07:09:56 发布

原创最新推荐文章于 2017-05-30 07:09:56 发布 · 366 阅读

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#android #视频

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本文介绍如何使用SurfaceView在Android应用中展示相机画面，并实现横屏显示。提供了拍照和录像功能的具体实现代码，包括相机参数设置、预览画面展示、图片保存及视频录制等关键步骤。

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小练习：

用SurfaceView展示画面

设置横屏

<activity android:name=".MainActivity"
            android:screenOrientation="landscape"
            >

拍照


public class MainActivity extends AppCompatActivity {

    private SurfaceView surfaceView;
    private Camera camera;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        surfaceView = (SurfaceView) findViewById(R.id.surface);
        surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                //画面创建
                //打开相机
                camera = Camera.open();
                //设置参数
                Camera.Parameters parameters= camera.getParameters();
                parameters.setPictureFormat(PixelFormat.JPEG);
                parameters.set("jpeg_quality",85);
                camera.setParameters(parameters);
                try {//将画面进行展示
                    camera.setPreviewDisplay(surfaceView.getHolder());
                    camera.startPreview();//开启预览
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

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

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                //画面销毁
                if (camera!=null){
                    camera.release();
                    camera.stopPreview();
                    camera=null;
                }
            }
        });
    }
    public void photo(View view){
        camera.takePicture(null, null, new Camera.PictureCallback() {
            @Override
            public void onPictureTaken(byte[] data, Camera camera) {
                //实例化文件输出流
                //压缩图片   将字节数组转成Bitmap
                Bitmap bitmap= BitmapFactory.decodeByteArray(data,0,data.length);
                try {
                    FileOutputStream fos=new FileOutputStream("/mnt/sdcard/dcim/camera/G_"+System.currentTimeMillis()+".png");
                    bitmap.compress(Bitmap.CompressFormat.PNG,85,fos);
                    camera.stopPreview();
                    camera.startPreview();
                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                }
            }
        });
    }
}

权限

 <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

录视频


public class RecoderActivity extends AppCompatActivity {

    private SurfaceView surfaceView;
    private MediaRecorder mediaRecorder;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recoder);

        surfaceView = (SurfaceView) findViewById(R.id.surface);
        //实例化媒体录制器
        mediaRecorder = new MediaRecorder();

    }
    public void start(View view){
        mediaRecorder.reset();

    //设置音频，视频来源
        mediaRecorder.setVideoSource(MediaRecorder.VideoSource.CAMERA);
        mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);


        //设置输出格式
        mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);

        //设置视频编码格式
        mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H263);
        //设置音频
        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

        //设置保存路径
        mediaRecorder.setOutputFile("/mnt/sdcard/G_\"+System.currentTimeMillis()+\".mp4");
        //画面
        mediaRecorder.setPreviewDisplay(surfaceView.getHolder().getSurface());
        try {//准备
            mediaRecorder.prepare();
            mediaRecorder.start();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
 public void stop(View view){
        mediaRecorder.stop();
    }
}

权限

 <uses-permission android:name="android.permission.RECORD_AUDIO"></uses-permission>

其他打开前摄像头的方法：http://blog.youkuaiyun.com/nupt123456789/article/details/7980720
及详细的自定义照相机：
http://blog.youkuaiyun.com/gf771115/article/details/19438409
有兴趣也可以自己扩展更多。