Android 相机2之常用工具代码（预览方向、预览尺寸、全屏显示、分辨平板）
2.1设置相机展示方向
public static void setCameraDisplayOrientation(Activity activity,int cameraId, android.hardware.Camera camera) {
android.hardware.Camera.CameraInfo info =
new android.hardware.Camera.CameraInfo();
android.hardware.Camera.getCameraInfo(cameraId, info);
int rotation = activity.getWindowManager().getDefaultDisplay()
.getRotation();
int degrees = 0;
switch (rotation) {
case Surface.ROTATION_0: degrees = 0; break;
case Surface.ROTATION_90: degrees = 90; break;
case Surface.ROTATION_180: degrees = 180; break;
case Surface.ROTATION_270: degrees = 270; break;
}
int result;
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
result = (info.orientation + degrees) % 360;
result = (360 - result) % 360; // compensate the mirror
} else { // back-facing
result = (info.orientation - degrees + 360) % 360;
}
camera.setDisplayOrientation(result);
}
2.2 得到合适的预览尺寸
private List
if (parameters == null) {
return null;
}
if (mPictureSizeList == null) {
mPictureSizeList = new ArrayList<>();
} else {
mPictureSizeList.clear();
}
mSupportedPicSizeList = new ArrayList<>();
for (Camera.Size size : parameters.getSupportedPictureSizes()) {
if(equalsRate(size, 1.777f)) {
mSupportedPicSizeList.add(size);
}
}
for (Camera.Size size : mSupportedPicSizeList) {
mPictureSizeList.add(size.width + "×" + size.height);
}
return mSupportedPicSizeList;
}
2.3 设置全屏显示
private void setFullScreen() {
int flag = WindowManager.LayoutParams.FLAG_FULLSCREEN;
getWindow().setFlags(flag,flag);
getWindow().requestFeature(Window.FEATURE_NO_TITLE);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
2.4判断是平板OR手机
public static boolean isTablet(Context context) {
return (context.getResources().getConfiguration().screenLayout
& Configuration.SCREENLAYOUT_SIZE_MASK)
>= Configuration.SCREENLAYOUT_SIZE_LARGE;
}
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