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[英]How to check whether the photo was taken in landscape or portrait mode in Android?
[英]image taken when in portrait mode should retain in landscape mode in android
我正在创建一个应用程序,在该应用程序中,单击操作栏项,将启动摄影机活动,并在捕获并保存图片后将其显示在主要活动上。
现在,如果我以肖像方向从MainActivity启动相机,然后在Camera Activity中切换为横向,拍摄图片,然后单击“保存”按钮,它将返回MainActivity,但是没有显示图像,这就是我猜猜是因为主要活动正在重新加载,但是我不确定。
即使改变方向,我如何也必须保留图像。
MainActivity.java
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_camera:
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// file creation for saving video
Uri fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
if (fileUri != null) {
targetFile = fileUri.getPath();
// setting file image name
intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}
return true;
onActivityResult()
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
if (resultCode == RESULT_OK) {
// Image captured and saved to fileUri specified in the Intent
ImageView imgPicture = (ImageView) findViewById(R.id.imgPicture);
if (targetFile != null) {
theFile = targetFile;
imgPicture.setImageBitmap(BitmapFactory.decodeFile(theFile));
}
} else if (resultCode == RESULT_CANCELED) {
} else {
Toast.makeText(this, "Your picture could not be saved.", Toast.LENGTH_LONG).show();
}
}
}
Manifest.xml
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="17" />
<uses-feature
android:name="android.hardware.camera"
android:required="true" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.ActionBarTest.MainActivity"
android:label="@string/app_name"
android:launchMode="singleTop">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
也许您可以使用它来知道如何保存图像,然后制作位图或基于该图像的任何东西
public static int getExifRotation(String imgPath)
{
try
{
ExifInterface exif = new ExifInterface(imgPath);
String rotationAmount = exif.getAttribute(ExifInterface.TAG_ORIENTATION);
if (!TextUtils.isEmpty(rotationAmount))
{
int rotationParam = Integer.parseInt(rotationAmount);
switch (rotationParam)
{
case ExifInterface.ORIENTATION_NORMAL:
return 0;
case ExifInterface.ORIENTATION_ROTATE_90:
return 90;
case ExifInterface.ORIENTATION_ROTATE_180:
return 180;
case ExifInterface.ORIENTATION_ROTATE_270:
return 270;
default:
return 0;
}
}
else
{
return 0;
}
}
catch (Exception ex)
{
return 0;
}
}
还检查
if(bitmap.getWidth() > bitmap.getHeight()){}
这将让您知道图片是否为横向,因为宽度将大于高度,并使用需要矩阵旋转的位图构造函数:
Matrix matrix = new Matrix();
matrix.postRotate(90); //or whatever
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