背景
考研过程中使用了Anki，不能不感叹这款神器的牛皮，尽管自己尚未开发出这款App的全部功能，但它已经将我的英语词汇和写作往前面推了一些。感叹和由衷地感激这款遍布全球的项目的伟大，我也想为这个项目做些什么。首先就是想完成考研中咒骂了无数次的坑，怎么不自带一个截图功能。后哦来！我总算懂的这个坑因何无人来填。TMD，适配太难受了。尤其是小米和华为这两个行业巨头（中指），系统定制化太过严重，为了提升用户体验，篡改了很多原生Intent设置，不得不写出很多冗余代码只为适配这些独特机型，呵呵，MMP， 在墙内，原生的无法使用必须定制化这可以理解，定制化的系统更加方便国内用户的使用，这毫无疑问，在全球怕是再没有那个国家像中国的Android这样友好的用户体验，一切以用户为核心，从利益出发。这也导致在国内碎片话严重的令人发指，以及各种千奇百怪的保活策略和有意思的白名单。哎呀，现在强盗收保护费都收的那么理直气壮吗？ 我记得一次在面试招XX银行时的时候我遇到这么一个问题，请问你怎么实现保活？emmmm，哈哈哈哈。
顺利完成裁剪任务
历时两天我完成了裁剪功能的添加。想想也还是有点小激动的，马上成为34个国家app的贡献者之一啦！代码如下：1
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271public class BasicImageFieldController extends FieldControllerBase implements IFieldController {
private static final int ACTIVITY_SELECT_IMAGE = 1;
private static final int ACTIVITY_TAKE_PICTURE = 2;
private static final int ACTIVITY_CROP_PICTURE = 3;
private static final int IMAGE_SAVE_MAX_WIDTH = 1920;
private ImageView mImagePreview;
private int showCropButton = 0;
public void createUI(Context context, LinearLayout layout) {
mImagePreview = new ImageView(mActivity);
mLinearLayout = layout;
DisplayMetrics metrics = getDisplayMetrics();
int height = metrics.heightPixels;
int width = metrics.widthPixels;
LinearLayout.LayoutParams p = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
android.view.ViewGroup.LayoutParams.WRAP_CONTENT);
setPreviewImage(mField.getImagePath(), getMaxImageSize());
mImagePreview.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
mImagePreview.setAdjustViewBounds(true);
mImagePreview.setMaxHeight((int) Math.round(height * 0.4));
mImagePreview.setMaxWidth((int) Math.round(width * 0.6));
Button mBtnGallery = new Button(mActivity);
mBtnGallery.setText(gtxt(R.string.multimedia_editor_image_field_editing_galery));
mBtnGallery.setOnClickListener(v -> {
Intent i = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
mActivity.startActivityForResultWithoutAnimation(i, ACTIVITY_SELECT_IMAGE);
});
Button mBtnCamera = new Button(mActivity);
mBtnCamera.setText(gtxt(R.string.multimedia_editor_image_field_editing_photo));
mBtnCamera.setOnClickListener(v -> {
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
File image;
File storageDir;
String timeStamp = new SimpleDateFormat("yyyyMMddHHmmss", Locale.US).format(new Date());
try {
storageDir = mActivity.getCacheDir();
image = File.createTempFile("img_" + timeStamp, ".jpg", storageDir);
mTempImagePath = image.getPath();
Uri uriSavedImage = FileProvider.getUriForFile(mActivity,
mActivity.getApplicationContext().getPackageName() + ".apkgfileprovider",
image);
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, uriSavedImage);
if (cameraIntent.resolveActivity(context.getPackageManager()) != null) {
mActivity.startActivityForResultWithoutAnimation(cameraIntent, ACTIVITY_TAKE_PICTURE);
}
else {
Timber.w("Device has a camera, but no app to handle ACTION_IMAGE_CAPTURE Intent");
}
} catch (IOException e) {
e.printStackTrace();
}
});
if (ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
mBtnCamera.setVisibility(View.INVISIBLE);
}
// Some hardware has no camera or reports yes but has zero (e.g., cheap devices, and Chromebook emulator)
if ((!context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA) &&
!context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_FRONT)) ||
(CompatHelper.getCompat().getCameraCount() < 1)) {
mBtnCamera.setVisibility(View.INVISIBLE);
}
layout.addView(mImagePreview, ViewGroup.LayoutParams.MATCH_PARENT, p);
layout.addView(mBtnGallery, ViewGroup.LayoutParams.MATCH_PARENT);
layout.addView(mBtnCamera, ViewGroup.LayoutParams.MATCH_PARENT);
}
private String gtxt(int id) {
return mActivity.getText(id).toString();
}
private DisplayMetrics getDisplayMetrics() {
if (mMetrics == null) {
mMetrics = new DisplayMetrics();
mActivity.getWindowManager().getDefaultDisplay().getMetrics(mMetrics);
}
return mMetrics;
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
// ignore RESULT_CANCELED but handle image select and take
if (resultCode == Activity.RESULT_CANCELED) {
return;
}
if (requestCode == ACTIVITY_SELECT_IMAGE) {
handleSelectImageResult(data);
} else if (requestCode == ACTIVITY_TAKE_PICTURE) {
handleTakePictureResult();
}else if (requestCode == ACTIVITY_CROP_PICTURE) {
handleCropResult(data);
}
showCropButton++;
if (showCropButton == 1) {
Button cropBtn = new Button(mActivity);
cropBtn.setText(gtxt(R.string.crop_button));
cropBtn.setOnClickListener(v -> {
File file = new File(mTempImagePath);
Uri uri = FileProvider.getUriForFile(mActivity, mActivity.getApplicationContext().getPackageName() + ".apkgfileprovider", file);
photoCrop(uri);
});
mLinearLayout.addView(cropBtn);
}
}
private String rotateAndCompress(String inPath) {
// Set the rotation of the camera image and save as png
File f = new File(inPath);
// use same filename but with png extension for output file
String outPath = inPath.substring(0, inPath.lastIndexOf(".")) + ".png";
// Load into a bitmap with max size of 1920 pixels and rotate if necessary
Bitmap b = BitmapUtil.decodeFile(f, IMAGE_SAVE_MAX_WIDTH);
FileOutputStream out = null;
try {
out = new FileOutputStream(outPath);
b = ExifUtil.rotateFromCamera(f, b);
b.compress(Bitmap.CompressFormat.PNG, 90, out);
f.delete();
return outPath;
} catch (FileNotFoundException e) {
Timber.e(e, "Error in BasicImageFieldController.rotateAndCompress()");
return inPath;
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
private void setPreviewImage(String imagePath, int maxsize) {
if (imagePath != null && !imagePath.equals("")) {
File f = new File(imagePath);
Bitmap b = BitmapUtil.decodeFile(f, maxsize);
b = ExifUtil.rotateFromCamera(f, b);
mImagePreview.setImageBitmap(b);
}
}
public void onDestroy() {
ImageView imageView = mImagePreview;
BitmapUtil.freeImageView(imageView);
showCropButton = 0;
}
/**
* Standard system crop intent
* @param uri
*/
public void photoCrop(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, "image/*");
intent.putExtra("crop", "true");
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.putExtra("return-data", true);
mActivity.startActivityForResultWithoutAnimation(intent, ACTIVITY_CROP_PICTURE);
}
private void showCropDialog(Uri uri) {
new MaterialDialog.Builder(mActivity)
.content(R.string.crop_image)
.positiveText(R.string.dialog_ok)
.negativeText(R.string.dialog_cancel)
.onPositive((dialog, which) -> {
photoCrop(uri);
})
.build().show();
}
private void writeCropImage(Bitmap cropImage) {
if (cropImage != null) {
FileOutputStream out = null;
File storageDir = mActivity.getCacheDir();
String fileName = mTempImagePath.substring(mTempImagePath.lastIndexOf("/") + 1, mTempImagePath.lastIndexOf("."));
if (!fileName.contains("crop")) {
fileName += "_crop";
}
String outPath = storageDir.getAbsolutePath() + "/" + fileName + ".png";
try {
out = new FileOutputStream(outPath);
cropImage.compress(Bitmap.CompressFormat.PNG, 90, out);
mField.setImagePath(outPath);
mField.setHasTemporaryMedia(true);
mTempImagePath = outPath;
} catch (FileNotFoundException e) {
Timber.e(e, "Error in BasicImageFieldController.rotateAndCompress()");
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
private void handleSelectImageResult(Intent data) {
Uri selectedImage = data.getData();
// Timber.d(selectedImage.toString());
String[] filePathColumn = { MediaColumns.DATA };
Cursor cursor = mActivity.getContentResolver().query(selectedImage, filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String filePath = cursor.getString(columnIndex);
cursor.close();
mField.setImagePath(filePath);
setPreviewImage(filePath, getMaxImageSize());
mTempImagePath = filePath;
showCropDialog(selectedImage);
}
private void handleTakePictureResult() {
String imagePath = rotateAndCompress(mTempImagePath);
mField.setImagePath(imagePath);
mField.setHasTemporaryMedia(true);
setPreviewImage(imagePath, getMaxImageSize());
mTempImagePath = imagePath;
File file = new File(imagePath);
Uri uri = FileProvider.getUriForFile(mActivity, mActivity.getApplicationContext().getPackageName() + ".apkgfileprovider", file);
showCropDialog(uri);
}
private void handleCropResult(Intent data) {
Bundle bundle = data.getExtras();
if (bundle != null) {
Bitmap b = bundle.getParcelable("data");
mImagePreview.setImageBitmap(b);
writeCropImage(b);
}
}
}
FilePath文件1
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<paths>
<external-cache-path path="export/" name="export-directory" />
<cache-path path="/" name="cache-directory" />
<external-path path="." name="photos" />
</paths>
然而适配的并不顺利，小米和华为直接闪退，网上查了下，小米和华为不支持裁剪直接返回Bitmap，想想也是哈，毕竟Binder支持1MB的大小交互，而且闪退时的Error也有出现Binder的影子。想办法解决，那没返回值，像拍照一样直接传入写入的uri让系统裁剪程序向该Uri进行写入，再进行读取岂不妙哉。
失望
我又一次失败了，TMD，咋一直报安全异常呢1
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8Writing exception to parcel
java.lang.SecurityException: Permission Denial: writing androidx.core.content.FileProvider uri content://com.ichi2.anki.apkgfileprovider/cache-directory/img_201904190726581247673844.jpg from pid=3207, uid=10008 requires the provider be exported, or grantUriPermission()
at android.content.ContentProvider.enforceWritePermissionInner(ContentProvider.java:682)
at android.content.ContentProvider$Transport.enforceWritePermission(ContentProvider.java:497)
at android.content.ContentProvider$Transport.enforceFilePermission(ContentProvider.java:469)
at android.content.ContentProvider$Transport.openAssetFile(ContentProvider.java:384)
at android.content.ContentProviderNative.onTransact(ContentProviderNative.java:262)
at android.os.Binder.execTransact(Binder.java:565)
代码我写的不错啊！有条有理，章法清晰的复制粘贴。
1 | public class BasicImageFieldController extends FieldControllerBase implements IFieldController { |
对比了下参考代码，唯一的区别的就是我是选择当前的app的缓存目录作为输出uri，而参考代码则是选择sdcard的外存目录的指定文件夹作为目录，于是我死马当作活马医狠下心选择外存作为写入uri. 还别说，真香
扒开云雾见月明
为什么同样是将缓存目录作为写入uri,而照相机可以成功写入，而裁剪功能却不行，会报安全异常，权限非法。分析异常可以看出是FileProvider没有授权，然而哈，我已经在FilePath进行了注册，而且拍照功能是可以正常运行的。至今仍是懵逼中。为毛同样的输出Uri，拍照Intent可以写入，而Crop Intent却不行。神奇诶。而且这个并非是定制化的锅，我在官方模拟器测过同样会报这个error，由此可见是系统rom的Crop Intent处理与Take Photo Intent不同。算是一个遗留下的坑以后看系统源码来填。