本文介绍了在Android开发中调用Camera实现自定义照相的具体实现代码。可以直接加入工程中，希望大家喜欢。
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);
}
}
}
