/** 开关灯 */
private void operateLight() {
if (!mIsLightOpen) {
cameraManager.openLight();
mIsLightOpen = true;
mLightBtn.setImageResource(R.drawable.light_pressed);
} else {
cameraManager.offLight();
mIsLightOpen = false;
mLightBtn.setImageResource(R.drawable.light_normal);
}
}
/** 关灯 */
private void offLight() {
if (mIsLightOpen) {
cameraManager.offLight();
mIsLightOpen = false;
mLightBtn.setImageResource(R.drawable.light_normal);
}
}
private void initCamera(SurfaceHolder surfaceHolder) {
if (surfaceHolder == null) {
throw new IllegalStateException("No SurfaceHolder provided");
}
if (cameraManager.isOpen()) {
Log.w(LOG_TAG, "initCamera() while already open -- late SurfaceView callback?");
return;
}
try {
cameraManager.openDriver(surfaceHolder);
// Creating the handler starts the preview, which can also throw a
// RuntimeException.
if (handler == null) {
handler = new CaptureActivityHandler(this, cameraManager, DecodeThread.ALL_MODE);
}
initCrop();
} catch (IOException ioe) {
Log.w(LOG_TAG, ioe);
displayFrameworkBugMessageAndExit();
} catch (RuntimeException e) {
// Barcode Scanner has seen crashes in the wild of this variety:
// java.?lang.?RuntimeException: Fail to connect to camera service
Log.w(LOG_TAG, "Unexpected error initializing camera", e);
displayFrameworkBugMessageAndExit();
}
}
@Override
protected void onPause() {
if (handler != null) {
handler.quitSynchronously();
handler = null;
}
inactivityTimer.onPause();
beepManager.close();
cameraManager.closeDriver();
if (!isHasSurface) {
scanPreview.getHolder().removeCallback(this);
}
super.onPause();
}
/** 初始化截取的矩形区域 */
@SuppressWarnings("SuspiciousNameCombination")
private void initCrop() {
// http://skillcollege.github.io/2015/02/05/-打造极致二维码扫描系列-基于ZBar的Android平台解码/
// 预览图的高度，也即camera的分辨率宽高
int cameraWidth = cameraManager.getCameraResolution().y;
int cameraHeight = cameraManager.getCameraResolution().x;
/** 获取布局中扫描框的位置信息 */
int[] location = new int[2];
scanCropView.getLocationInWindow(location);
// 布局文件中扫描框的左上角定点坐标
int cropLeft = location[0];
int cropTop = location[1] - getStatusBarHeight();
// 布局文件中扫描框的宽高
int cropWidth = scanCropView.getWidth();
int cropHeight = scanCropView.getHeight();
/** 获取布局容器的宽高 */
int containerWidth = scanContainer.getWidth();
int containerHeight = scanContainer.getHeight();
/** 计算最终截取的矩形的左上角顶点x坐标 */
int x = cropLeft * cameraWidth / containerWidth;
/** 计算最终截取的矩形的左上角顶点y坐标 */
int y = cropTop * cameraHeight / containerHeight;
/** 计算最终截取的矩形的宽度 */
int width = cropWidth * cameraWidth / containerWidth;
/** 计算最终截取的矩形的高度 */
int height = cropHeight * cameraHeight / containerHeight;
/** 生成最终的截取的矩形 */
mCropRect = new Rect(x, y, width + x, height + y);
}