[RK3288][Android6.0] 调试笔记 --- Camera Preview测试用例

Platform: RK3288
OS: Android 6.0
Kernel: 3.10.92

说明：

1.打开就预览
2. button用于控制是开启preview callback并保存为jpg

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源代码：

package com.example.camerapreviewtest;


import android.content.Context;
import android.graphics.ImageFormat;
import android.graphics.Rect;
import android.graphics.YuvImage;
import android.hardware.Camera;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.ContentFrameLayout;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;

import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private Camera mCamera;
    private CameraPreview mPreview;
    SurfaceHolder mSurfaceHolder;

    private static final String TAG = "MainActivity";



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.camera_preview);
        Log.i(TAG, "camera number: "+Camera.getNumberOfCameras());
        mCamera = getCameraInstance();
        mPreview = new CameraPreview(this, mCamera);
        FrameLayout preview = (FrameLayout) findViewById(R.id.camera_preview);
        preview.addView(mPreview);

        Button button = (Button) findViewById(R.id.button);

        button.setOnClickListener(
                new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Log.i(TAG, "onClick: ");
                        mCamera.setPreviewCallback(new Camera.PreviewCallback(){
                            @Override
                            public void onPreviewFrame(byte[] data, Camera camera) {
                                Camera.Size size = mCamera.getParameters().getPreviewSize();
                                //Log.i(TAG, "onPreviewFrame: width:"+size.width+" height:"+size.height);
                                try{
                                    YuvImage image = new YuvImage(data, ImageFormat.NV21, size.width, size.height, null);
                                    if(image!=null){
                                        ByteArrayOutputStream stream = new ByteArrayOutputStream();
                                        image.compressToJpeg(new Rect(0, 0, size.width, size.height), 80 ,stream);

                                        FileOutputStream output = new FileOutputStream("/sdcard/t.jpg");
                                        output.write(stream.toByteArray());
                                        output.flush();
                                        output.close();
                                        Log.i(TAG, "onPreviewFrame: to jpeg");
                                    }
                                } catch (Exception e){

                                }
                            }
                        });
                    }
                }
        );

    }

    public static Camera getCameraInstance(){
        Camera c = null;
        try {
            c = Camera.open();
            if(c==null)
                Log.i(TAG, "getCameraInstance: ");
        }catch (Exception e){
            Log.i(TAG, "getCameraInstance: exception");
        }
        return c;
    }

    public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback{
        private SurfaceHolder mHolder;
        private Camera mCamera;
        public CameraPreview(Context context, Camera camera){
            super(context);
            mCamera = camera;
            mHolder = getHolder();
            mHolder.addCallback(this);
        }

        public void surfaceCreated(SurfaceHolder holder){
            try {
                mCamera.setPreviewDisplay(holder);
                mCamera.startPreview();
            }catch (IOException e){

            }
        }

        @Override
        public void surfaceDestroyed(SurfaceHolder holder) {
            if(mCamera!=null){
                mCamera.stopPreview();
                mCamera.release();
                mCamera = null;
            }
        }

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

        }
    }
}

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完整工程下载：
https://download.csdn.net/download/kris_fei/10451832

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参考：

Google Camera API
Android相机开发(一):最简单的相机
Android中Camera的开发的简单例子