Android调用Camera实现自定义照相

首先是布局文件，线性布局，左边两个按钮垂直摆放，右边预览图以及照相获取到的图：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:orientation="horizontal" > 
 
    <LinearLayout 
        android:layout_width="200dip" 
        android:layout_height="150dip" 
        android:orientation="vertical" > 
 
        <Button 
            android:id="@+id/btn1" 
            android:layout_width="80dip" 
            android:layout_height="50dip" 
            android:text="Start takPic" /> 
 
        <Button 
            android:id="@+id/btn2" 
            android:layout_width="80dip" 
            android:layout_height="50dip" 
            android:text="Get Pic" /> 
    </LinearLayout> 
 
    <LinearLayout 
        android:id="@+id/cameraView" 
        android:layout_width="200dip" 
        android:layout_height="150dip" 
        android:orientation="vertical" > 
    </LinearLayout> 
 
</LinearLayout> 

代码，都写在一起的。包含一个自定义的surfaceView（用于相机的照相预览）.以及activit：

package com.nico; 
 
import java.io.ByteArrayInputStream; 
import java.io.IOException; 
 
import android.app.Activity; 
import android.content.Context; 
import android.graphics.PixelFormat; 
import android.graphics.drawable.BitmapDrawable; 
import android.graphics.drawable.Drawable; 
import android.hardware.Camera; 
import android.os.Bundle; 
import android.os.Environment; 
import android.util.Log; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.view.View; 
import android.view.Window; 
import android.view.WindowManager; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.LinearLayout; 
 
public class Test extends Activity implements OnClickListener { 
    /** Called when the activity is first created. */ 
 
    // camera 类 
    private Camera camera = null; 
    // 继承surfaceView的自定义view 用于存放照相的图片 
    private CameraView cv = null; 
 
    // 回调用的picture，实现里边的onPictureTaken方法，其中byte[]数组即为照相后获取到的图片信息 
    private Camera.PictureCallback picture = new Camera.PictureCallback() { 
 
        @Override 
        public void onPictureTaken(byte[] data, Camera camera) { 
            // 主要就是将图片转化成drawable，设置为固定区域的背景（展示图片），当然也可以直接在布局文件里放一个surfaceView供使用。 
            ByteArrayInputStream bais = new ByteArrayInputStream(data); 
            Drawable d = BitmapDrawable.createFromStream(bais, Environment 
                    .getExternalStorageDirectory().getAbsolutePath() 
                    + "/img.jpeg"); 
            l.setBackgroundDrawable(d); 
            try { 
            } catch (Exception e) { 
                e.printStackTrace(); 
            } 
        } 
 
    }; 
 
    // 按钮 布局等定义，不作赘述 
    Button btn1 = null; 
    Button btn2 = null; 
    LinearLayout l = null; 
 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
        super.onCreate(savedInstanceState); 
 
        requestWindowFeature(Window.FEATURE_NO_TITLE); 
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
                WindowManager.LayoutParams.FLAG_FULLSCREEN); 
        getWindow().setFormat(PixelFormat.TRANSLUCENT); 
        setContentView(R.layout.main); 
 
        l = (LinearLayout) findViewById(R.id.cameraView); 
        btn1 = (Button) findViewById(R.id.btn1); 
        btn2 = (Button) findViewById(R.id.btn2); 
 
        btn1.setOnClickListener(this); 
        btn2.setOnClickListener(this); 
    } 
 
    //主要的surfaceView，负责展示预览图片，camera的开关 
    class CameraView extends SurfaceView { 
 
        // 
        private SurfaceHolder holder = null; 
 
        public CameraView(Context context) { 
            super(context); 
            holder = this.getHolder(); 
 
            holder.addCallback(new SurfaceHolder.Callback() { 
 
                @Override 
                public void surfaceChanged(SurfaceHolder holder, int format, 
                        int width, int height) { 
                    Camera.Parameters parameters = camera.getParameters(); 
                    //以下注释掉的是设置预览时的图像以及拍照的一些参数 
                    // parameters.setPictureFormat(PixelFormat.JPEG); 
                    // parameters.setPreviewSize(parameters.getPictureSize().width, 
                    // parameters.getPictureSize().height); 
                    // parameters.setFocusMode("auto"); 
                    // parameters.setPictureSize(width, height); 
                    camera.setParameters(parameters); 
                    camera.startPreview(); 
                } 
 
                @Override 
                public void surfaceCreated(SurfaceHolder holder) { 
                    camera = Camera.open(); 
 
                    try { 
                        //设置camera预览的角度，因为默认图片是倾斜90度的 
                        camera.setDisplayOrientation(90); 
                        //设置holder主要是用于surfaceView的图片的实时预览，以及获取图片等功能，可以理解为控制camera的操作.. 
                        camera.setPreviewDisplay(holder); 
                    } catch (IOException e) { 
                        camera.release(); 
                        camera = null; 
                        e.printStackTrace(); 
                    } 
 
                } 
 
                @Override 
                public void surfaceDestroyed(SurfaceHolder holder) { 
                    //顾名思义可以看懂 
                    camera.stopPreview(); 
                    camera.release(); 
                    camera = null; 
                } 
            }); 
//          holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
        } 
    } 
 
    @Override 
    public void onClick(View v) { 
        if (v == btn1) { 
            l.removeAllViews(); 
            cv = new CameraView(Test.this); 
            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams( 
                    LinearLayout.LayoutParams.FILL_PARENT, 
                    LinearLayout.LayoutParams.FILL_PARENT); 
            l.addView(cv, params); 
        } else if (v == btn2) { 
            camera.takePicture(null, null, picture); 
        } 
    } 
}