Android Camera开发：给摄像头预览界面加个ZoomBar（附完整代码下载）

废话不说了，就是加个seekbar，拖动的话能够调节焦距，让画面变大或缩小。下面是核心程序：

一，camera的布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/BestWish"
tools:context=".StandardCamera" />
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<SurfaceView
android:id="@+id/previewSV"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</FrameLayout>
<LinearLayout
android:id="@+id/zoomLayout"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:layout_centerInParent="true"
android:layout_centerHorizontal="true"
android:orientation="horizontal" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="-"
android:textColor="#ffffff"
android:textSize="30dip"/>
<SeekBar
android:id="@+id/seekbar_zoom"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:progressDrawable="@drawable/seekbar_style"
android:thumb="@drawable/ic_launcher"
android:thumbOffset="0dp" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="+"
android:textColor="#ffffff"
android:textSize="30dip" />
</LinearLayout>
</RelativeLayout>
<ImageButton
android:id="@+id/photoImgBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="@drawable/photo_img_btn" />
</LinearLayout>

其中里面嵌套的LinearLayout就是那个ZoomBar，最外面我用了相对布局，发现相对布局用起来还是很好用的。为了方便以后扩展，Camera的SurfaceView用的帧布局。注意SeekBar的几个参数，其中的progressDrawable是指那个横条的形状，可以直接用个图片，也可以写个xml文件。这里用的是xml，当然用图片很简单。seekbar_style.xml文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item android:id="@android:id/background">
<shape>
<corners android:radius="5dip" />
<gradient
android:startColor="#ff9d9e9d"
android:centerColor="#ff5a5d5a"
android:centerY="0.75"
android:endColor="#ff747674"
android:angle="270"
/>
</shape>
</item>
</layer-list>

下面的android:thumb是滑动的那个手柄，本来我是写了一个xml文件，名字为thumb.xml如下：

<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- 按下状态 -->
<item android:state_focused="true" android:state_pressed="true"><shape android:shape="oval">
<gradient android:angle="0" android:centerColor="#FF00FF00" android:endColor="#000000" android:gradientRadius="8" android:startColor="#FFFF0000" android:type="radial" />
<size android:height="20dip" android:width="20dip"></size>
</shape></item>
</selector>

无奈啥也显示不出来，索性直接找了个粗糙的图片，见谅哈！

二，整个程序的主代码：

package yan.guoqi.camera;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import yan.guoqi.rectphoto.R;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Matrix;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.AutoFocusCallback;
import android.hardware.Camera.Parameters;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.PreviewCallback;
import android.hardware.Camera.ShutterCallback;
import android.os.Bundle;
import android.util.Log;
import android.view.Display;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.view.ViewGroup.LayoutParams;
import android.view.Window;
import android.view.WindowManager;
import android.widget.ImageButton;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
public class StandardCamera extends Activity implements SurfaceHolder.Callback, PreviewCallback{
private static final String tag="StandardCamera";
private boolean isPreview = false;
private SurfaceView mPreviewSV = null; //棰勮SurfaceView
private SurfaceHolder mySurfaceHolder = null;
private ImageButton mPhotoImgBtn = null;
private Camera myCamera = null;
private Bitmap mBitmap = null;
private AutoFocusCallback myAutoFocusCallback = null;
boolean flag = true;
private SeekBar mZoomBar = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
int flag = WindowManager.LayoutParams.FLAG_FULLSCREEN;
Window myWindow = this.getWindow();
myWindow.setFlags(flag, flag);
setContentView(R.layout.activity_rect_photo);
initView();
mySurfaceHolder = mPreviewSV.getHolder();
mySurfaceHolder.setFormat(PixelFormat.TRANSLUCENT);
mySurfaceHolder.addCallback(this);
mySurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
myAutoFocusCallback = new AutoFocusCallback() {
public void onAutoFocus(boolean success, Camera camera) {
// TODO Auto-generated method stub
if(success)
{
Log.i(tag, "myAutoFocusCallback: success...");
}
else
{
Log.i(tag, "myAutoFocusCallback: 澶辫触浜�?.");
}
}
};
//添加ZoomBar
mZoomBar = (SeekBar)findViewById(R.id.seekbar_zoom);
mZoomBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
public void onStopTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
public void onStartTrackingTouch(SeekBar seekBar) {
// TODO Auto-generated method stub
}
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
Parameters p = myCamera.getParameters();
p.setZoom(progress);
myCamera.setParameters(p);
}
});
}
public void initView(){
mPreviewSV = (SurfaceView)findViewById(R.id.previewSV);
WindowManager wm = (WindowManager)getSystemService(Context.WINDOW_SERVICE);
Display display = wm.getDefaultDisplay();
LayoutParams lpSV = mPreviewSV.getLayoutParams();
lpSV.width = display.getWidth();
lpSV.height = (int) ((float)display.getHeight()*0.75);
mPreviewSV.setLayoutParams(lpSV);
mPhotoImgBtn = (ImageButton)findViewById(R.id.photoImgBtn);
LayoutParams lp = mPhotoImgBtn.getLayoutParams();
lp.width = 240;
lp.height = 240;
mPhotoImgBtn.setLayoutParams(lp);
mPhotoImgBtn.setOnClickListener(new PhotoOnClickListener());
mPhotoImgBtn.setOnTouchListener(new MyOnTouchListener());
}
public void surfaceChanged(SurfaceHolder holder, int format, int width,int height)
{
// TODO Auto-generated method stub
Log.i(tag, "SurfaceHolder.Callback:surfaceChanged!");
initCamera();
}
public void surfaceCreated(SurfaceHolder holder)
{
// TODO Auto-generated method stub
myCamera = Camera.open();
try {
myCamera.setPreviewDisplay(mySurfaceHolder);
Log.i(tag, "SurfaceHolder.Callback: surfaceCreated!");
} catch (IOException e) {
// TODO Auto-generated catch block
if(null != myCamera){
myCamera.release();
myCamera = null;
}
e.printStackTrace();
}
}
public void surfaceDestroyed(SurfaceHolder holder)
{
// TODO Auto-generated method stub
Log.i(tag, "SurfaceHolder.Callback锛歋urface Destroyed");
if(null != myCamera)
{
myCamera.setPreviewCallback(null);
myCamera.stopPreview();
isPreview = false;
myCamera.release();
myCamera = null;
}
}
public void initCamera(){
if(isPreview){
myCamera.stopPreview();
}
if(null != myCamera){
Camera.Parameters myParam = myCamera.getParameters();
myParam.setPictureFormat(PixelFormat.JPEG);//璁剧疆鎷嶇収鍚庡瓨鍌ㄧ殑鍥剧墖鏍煎紡
//List<Size> pictureSizes = myParam.getSupportedPictureSizes();
//List<Size> previewSizes = myParam.getSupportedPreviewSizes();
//          for(int i=0; i<pictureSizes.size(); i++){
//              Size size = pictureSizes.get(i);
//              Log.i(tag, "initCamera:pictureSizes: width = "+size.width+"height = "+size.height);
//          }
//          for(int i=0; i<previewSizes.size(); i++){
//              Size size = previewSizes.get(i);
//              Log.i(tag, "initCamera:鎽勫儚澶存敮鎸佺殑previewSizes: width = "+size.width+"height = "+size.height);
//
//          }
myParam.setPictureSize(1280, 960);  //
myParam.setPreviewSize(960, 720);   //
//myParam.set("rotation", 90);
myCamera.setDisplayOrientation(90);
List<String> focuseMode = (myParam.getSupportedFocusModes());
for(int i=0; i<focuseMode.size(); i++){
Log.i(tag, focuseMode.get(i));
if(focuseMode.get(i).contains("continuous")){
myParam.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
}
else{
myParam.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
}
}
//设置mZoomBar的最大值
mZoomBar.setMax(myParam.getMaxZoom());
myCamera.setParameters(myParam);
myCamera.startPreview();
myCamera.autoFocus(myAutoFocusCallback);
isPreview = true;
}
}
ShutterCallback myShutterCallback = new ShutterCallback()
{
public void onShutter() {
// TODO Auto-generated method stub
Log.i(tag, "myShutterCallback:onShutter...");
}
};
PictureCallback myRawCallback = new PictureCallback()
{
public void onPictureTaken(byte[] data, Camera camera) {
// TODO Auto-generated method stub
Log.i(tag, "myRawCallback:onPictureTaken...");
}
};
PictureCallback myJpegCallback = new PictureCallback()
{
public void onPictureTaken(byte[] data, Camera camera) {
// TODO Auto-generated method stub
Log.i(tag, "myJpegCallback:onPictureTaken...");
if(null != data){
mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);//data鏄瓧鑺傛暟鎹紝灏嗗叾瑙ｆ瀽鎴愪綅鍥�             myCamera.stopPreview();
isPreview = false;
}
Matrix matrix = new Matrix();
matrix.postRotate((float)90.0);
Bitmap rotaBitmap = Bitmap.createBitmap(mBitmap, 0, 0, mBitmap.getWidth(), mBitmap.getHeight(), matrix, false);
if(null != rotaBitmap)
{
saveJpeg(rotaBitmap);
}
myCamera.startPreview();
isPreview = true;
}
};
public class PhotoOnClickListener implements OnClickListener{
public void onClick(View v) {
// TODO Auto-generated method stub
if(isPreview && myCamera!=null){
myCamera.takePicture(myShutterCallback, null, myJpegCallback);
}
}
}
public void saveJpeg(Bitmap bm){
String savePath = "/mnt/sdcard/rectPhoto/";
File folder = new File(savePath);
if(!folder.exists()) {
folder.mkdir();
}
long dataTake = System.currentTimeMillis();
String jpegName = savePath + dataTake +".jpg";
Log.i(tag, "saveJpeg:jpegName--" + jpegName);
//File jpegFile = new File(jpegName);
try {
FileOutputStream fout = new FileOutputStream(jpegName);
BufferedOutputStream bos = new BufferedOutputStream(fout);
//          Bitmap newBM = bm.createScaledBitmap(bm, 600, 800, false);
bm.compress(Bitmap.CompressFormat.JPEG, 100, bos);
bos.flush();
bos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public class MyOnTouchListener implements OnTouchListener{
public final  float[] BT_SELECTED=new float[]
{ 2, 0, 0, 0, 2,
0, 2, 0, 0, 2,
0, 0, 2, 0, 2,
0, 0, 0, 1, 0 };
public final float[] BT_NOT_SELECTED=new float[]
{ 1, 0, 0, 0, 0,
0, 1, 0, 0, 0,
0, 0, 1, 0, 0,
0, 0, 0, 1, 0 };
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
if(event.getAction() == MotionEvent.ACTION_DOWN){
v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_SELECTED));
v.setBackgroundDrawable(v.getBackground());
}
else if(event.getAction() == MotionEvent.ACTION_UP){
v.getBackground().setColorFilter(new ColorMatrixColorFilter(BT_NOT_SELECTED));
v.setBackgroundDrawable(v.getBackground());
}
return false;
}
}
@Override
public void onBackPressed()
{
// TODO Auto-generated method stub
super.onBackPressed();
StandardCamera.this.finish();
}
class UpdateThread implements Runnable{
public void run() {
// TODO Auto-generated method stub
while(flag){
if(myCamera!=null && isPreview)
myCamera.autoFocus(myAutoFocusCallback); //鑷姩鑱氱劍
myCamera.setOneShotPreviewCallback(StandardCamera.this); //onPreviewFrame閲屼細鎺ュ彈鍒版暟鎹�?            myCamera.stopPreview(); //鍋滄棰勮
flag = false;
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
public void onPreviewFrame(byte[] data, Camera camera) {
// TODO Auto-generated method stub
}
}

需要注意的有以下几点：

1，为了让程序适用不同的手机，onCreate函数里用如下代码初始化SurfaceView的大小，避免以前写死的方法：

public void initView(){
  mPreviewSV = (SurfaceView)findViewById(R.id.previewSV);
  WindowManager wm = (WindowManager)getSystemService(Context.WINDOW_SERVICE);
  Display display = wm.getDefaultDisplay();
        LayoutParams lpSV = mPreviewSV.getLayoutParams();
        lpSV.width = display.getWidth();
        lpSV.height = (int) ((float)display.getHeight()*0.75);
        mPreviewSV.setLayoutParams(lpSV);

2，关于ZoomBar的代码片段很简短，如下：

mPhotoImgBtn = (ImageButton)findViewById(R.id.photoImgBtn);
  LayoutParams lp = mPhotoImgBtn.getLayoutParams();
  lp.width = 240;
  lp.height = 240;
  mPhotoImgBtn.setLayoutParams(lp);
  mPhotoImgBtn.setOnClickListener(new PhotoOnClickListener());
  mPhotoImgBtn.setOnTouchListener(new MyOnTouchListener());
}
  //添加ZoomBar
  mZoomBar = (SeekBar)findViewById(R.id.seekbar_zoom);
  mZoomBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

   public void onStopTrackingTouch(SeekBar seekBar) {
    // TODO Auto-generated method stub

   }

   public void onStartTrackingTouch(SeekBar seekBar) {
    // TODO Auto-generated method stub

   }

   public void onProgressChanged(SeekBar seekBar, int progress,
     boolean fromUser) {
    // TODO Auto-generated method stub
    Parameters p = myCamera.getParameters();
    p.setZoom(progress);
    myCamera.setParameters(p);
   }
  });

3，在initCamera函数里，查询camera支持的聚焦模式，如果带连续视频聚焦则使用连续视频聚焦，否则使用自动聚焦：

mPhotoImgBtn = (ImageButton)findViewById(R.id.photoImgBtn);
  LayoutParams lp = mPhotoImgBtn.getLayoutParams();
  lp.width = 240;
  lp.height = 240;
  mPhotoImgBtn.setLayoutParams(lp);
  mPhotoImgBtn.setOnClickListener(new PhotoOnClickListener());
  mPhotoImgBtn.setOnTouchListener(new MyOnTouchListener());
}
List<String> focuseMode = (myParam.getSupportedFocusModes());
   for(int i=0; i<focuseMode.size(); i++){
    Log.i(tag, focuseMode.get(i));
    if(focuseMode.get(i).contains("continuous")){
     myParam.setFocusMode(Camera.Parameters.FOCUS_MODE_CONTINUOUS_VIDEO);
    }
    else{
     myParam.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO);
    }
   }

4，同样在initCamera函数里，设置ZoomBar的最大值：
//设置mZoomBar的最大值
mZoomBar.setMax(myParam.getMaxZoom());

后续将写专文分析Camera4.0的源码，并且模仿到自己的代码中！

源码下载链接：http://download.csdn.net/detail/yanzi1225627/6421779

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