【執行個體簡介】
【執行個體截圖】
【核心代碼】
package org.yanzi.activity;
import org.yanzi.camera.CameraInterface;
import org.yanzi.camera.CameraInterface.CamOpenOverCallback;
import org.yanzi.camera.preview.CameraSurfaceView;
import org.yanzi.playcamera.R;
import org.yanzi.ui.MaskView;
import org.yanzi.util.DisplayUtil;
import android.app.Activity;
import android.graphics.Point;
import android.graphics.Rect;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.SurfaceHolder;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.ImageButton;
public class CameraActivity extends Activity implements CamOpenOverCallback {
private static final String TAG = "YanZi";
CameraSurfaceView surfaceView = null;
ImageButton shutterBtn;
MaskView maskView = null;
float previewRate = -1f;
int DST_CENTER_RECT_WIDTH = 200; //機關是dip
int DST_CENTER_RECT_HEIGHT = 200;//機關是dip
Point rectPictureSize = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Thread openThread = new Thread(){
@Override
public void run() {
// TODO Auto-generated method stub
CameraInterface.getInstance().doOpenCamera(CameraActivity.this);
}
};
openThread.start();
setContentView(R.layout.activity_camera);
initUI();
initViewParams();
shutterBtn.setOnClickListener(new BtnListeners());
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.camera, menu);
return true;
}
private void initUI(){
surfaceView = (CameraSurfaceView)findViewById(R.id.camera_surfaceview);
shutterBtn = (ImageButton)findViewById(R.id.btn_shutter);
maskView = (MaskView)findViewById(R.id.view_mask);
}
private void initViewParams(){
LayoutParams params = surfaceView.getLayoutParams();
Point p = DisplayUtil.getScreenMetrics(this);
params.width = p.x;
params.height = p.y;
Log.i(TAG, "screen: w = " p.x " y = " p.y);
previewRate = DisplayUtil.getScreenRate(this); //預設全屏的比例預覽
surfaceView.setLayoutParams(params);
//手動設定拍照ImageButton的大小為120dip×120dip,原圖檔大小是64×64
LayoutParams p2 = shutterBtn.getLayoutParams();
p2.width = DisplayUtil.dip2px(this, 80);
p2.height = DisplayUtil.dip2px(this, 80);;
shutterBtn.setLayoutParams(p2);
}
@Override
public void cameraHasOpened() {
// TODO Auto-generated method stub
SurfaceHolder holder = surfaceView.getSurfaceHolder();
CameraInterface.getInstance().doStartPreview(holder, previewRate);
if(maskView != null){
Rect screenCenterRect = createCenterScreenRect(DisplayUtil.dip2px(this, DST_CENTER_RECT_WIDTH)
,DisplayUtil.dip2px(this, DST_CENTER_RECT_HEIGHT));
maskView.setCenterRect(screenCenterRect);
}
}
private class BtnListeners implements OnClickListener{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch(v.getId()){
case R.id.btn_shutter:
if(rectPictureSize == null){
rectPictureSize = createCenterPictureRect(DisplayUtil.dip2px(CameraActivity.this, DST_CENTER_RECT_WIDTH)
,DisplayUtil.dip2px(CameraActivity.this, DST_CENTER_RECT_HEIGHT));
}
CameraInterface.getInstance().doTakePicture(rectPictureSize.x, rectPictureSize.y);
break;
default:break;
}
}
}
private Point createCenterPictureRect(int w, int h){
int wScreen = DisplayUtil.getScreenMetrics(this).x;
int hScreen = DisplayUtil.getScreenMetrics(this).y;
int wSavePicture = CameraInterface.getInstance().doGetPrictureSize().y; //因為圖檔旋轉了，是以此處寬高換位
int hSavePicture = CameraInterface.getInstance().doGetPrictureSize().x; //因為圖檔旋轉了，是以此處寬高換位
float wRate = (float)(wSavePicture) / (float)(wScreen);
float hRate = (float)(hSavePicture) / (float)(hScreen);
float rate = (wRate <= hRate) ? wRate : hRate;//也可以按照最小比率計算
int wRectPicture = (int)( w * wRate);
int hRectPicture = (int)( h * hRate);
return new Point(wRectPicture, hRectPicture);
}
private Rect createCenterScreenRect(int w, int h){
int x1 = DisplayUtil.getScreenMetrics(this).x / 2 - w / 2;
int y1 = DisplayUtil.getScreenMetrics(this).y / 2 - h / 2;
int x2 = x1 w;
int y2 = y1 h;
return new Rect(x1, y1, x2, y2);
}
}