android camera 通过onPreviewFrame采集视频

雨点打透心脏的1/2处 2022-01-16 05:11 361阅读 0赞

[2019独角兽企业重金招聘Python工程师标准>>> ][2019_Python_] ![hot3.png][]

package com.example.camera;
    
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    
    import android.app.Activity;
    import android.graphics.Rect;
    import android.graphics.YuvImage;
    import android.hardware.Camera;
    import android.hardware.Camera.Size;
    import android.os.Bundle;
    import android.os.Environment;
    import android.view.SurfaceHolder;
    import android.view.SurfaceView;
    
    public class MainActivity extends Activity implements SurfaceHolder.Callback,
    		Camera.PreviewCallback {
    
    	private SurfaceView mSurfaceview = null; // SurfaceView对象：(视图组件)视频显示
    	private SurfaceHolder mSurfaceHolder = null; // SurfaceHolder对象：(抽象接口)SurfaceView支持类
    	private Camera mCamera = null; // Camera对象，相机预览
    
    	@Override
    	public void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.main);
    		mSurfaceview = (SurfaceView) findViewById(R.id.surfaceview);
    		mSurfaceHolder = mSurfaceview.getHolder(); // 绑定SurfaceView，取得SurfaceHolder对象
    		mSurfaceHolder.addCallback(this); // SurfaceHolder加入回调接口
    		// mSurfaceHolder.setFixedSize(176, 144); // 预览大小設置
    		mSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);// 設置顯示器類型，setType必须设置
    	}
    
    	@Override
    	public void surfaceChanged(SurfaceHolder holder, int format, int width,
    			int height) {
    		if (mCamera == null) {
    			return;
    		}
    		mCamera.stopPreview();
    		mCamera.setPreviewCallback(this);
    		mCamera.startPreview();
    	}
    
    	@Override
    	protected void onResume() {
    		super.onResume();
    		mCamera = Camera.open();
    	}
    
    	@Override
    	protected void onPause() {
    		super.onPause();
    		if (mCamera != null) {
    			mCamera.release();
    			mCamera = null;
    		}
    	}
    
    	@Override
    	public void surfaceCreated(SurfaceHolder holder) {
    		try {
    			if (mCamera != null) {
    				mCamera.setPreviewDisplay(mSurfaceHolder);
    				mCamera.startPreview();
    			}
    		} catch (IOException e) {
    			e.printStackTrace();
    		}
    
    	}
    
    	@Override
    	public void surfaceDestroyed(SurfaceHolder holder) {
    
    	}
    
    	@Override
    	public void onPreviewFrame(byte[] data, Camera camera) {
    
    		// 刚刚拍照的文件名
    		String fileName = "IMG_"
    				+ new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date())
    						.toString() + ".jpg";
    		File sdRoot = Environment.getExternalStorageDirectory();
    		String dir = "/Camera/";
    		File mkDir = new File(sdRoot, dir);
    		if (!mkDir.exists())
    			mkDir.mkdirs();
    		File pictureFile = new File(sdRoot, dir + fileName);
    		if (!pictureFile.exists()) {
    			try {
    				pictureFile.createNewFile();
    				Camera.Parameters parameters = camera.getParameters();
    				Size size = parameters.getPreviewSize();
    				YuvImage image = new YuvImage(data,
    						parameters.getPreviewFormat(), size.width, size.height,
    						null);
    				FileOutputStream filecon = new FileOutputStream(pictureFile);
    				image.compressToJpeg(
    						new Rect(0, 0, image.getWidth(), image.getHeight()),
    						90, filecon);
    			} catch (IOException e) {
    				e.printStackTrace();
    			}
    		}
    	}
    }

参考：

[http://www.cnblogs.com/mengyan/archive/2012/09/01/2666641.html][http_www.cnblogs.com_mengyan_archive_2012_09_01_2666641.html]

[http://www.cnblogs.com/sight/archive/2012/04/17/2453671.html][http_www.cnblogs.com_sight_archive_2012_04_17_2453671.html]

[http://www.cnblogs.com/ice4c/archive/2010/10/18/1854756.html][http_www.cnblogs.com_ice4c_archive_2010_10_18_1854756.html]

转载于:https://my.oschina.net/eclipse88/blog/80115

[2019_Python_]: https://my.oschina.net/u/2663968/blog/3061697
[hot3.png]: /images/20220114/b7d4dfd5ab9e4a06a4d300cdd80b19c8.png
[http_www.cnblogs.com_mengyan_archive_2012_09_01_2666641.html]: http://www.cnblogs.com/mengyan/archive/2012/09/01/2666641.html
[http_www.cnblogs.com_sight_archive_2012_04_17_2453671.html]: http://www.cnblogs.com/sight/archive/2012/04/17/2453671.html
[http_www.cnblogs.com_ice4c_archive_2010_10_18_1854756.html]: http://www.cnblogs.com/ice4c/archive/2010/10/18/1854756.html