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片

<?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activity

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);
		}
	}
}