使用此代码创建新的意图来选择图像：
Intent intent = new Intent(Intent.ACTION_PICK, MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
intent.setType(image/*);
startActivityForResult(Intent.createChooser(intent, ""), Constants.SELECT_PICTURE);
使用此代码onActivityResult:
if (resultCode == Activity.RESULT_OK) {
if (requestCode == Constants.SELECT_PICTURE) {
Uri selectedImageUri = data.getData();
try {
if (isNewGooglePhotosUri(selectedImageUri)) {
resultFile = getPhotoFile(selectedImageUri);
} else {
resultFile = getFilePathForGallery(selectedImageUri);
}
if (resultFile == null) {
//error
return;
}
} catch (Exception e) {
e.printStackTrace();
//error
return;
}
}
}
}
另外，这是我在代码中使用的一些有用的函数：
private File getFilePathForGallery(Uri contentUri) {
String path = null;
String[] proj = {MediaStore.Images.Media.DATA};
Cursor cursor = getContentResolver().query(contentUri, proj, null, null, null);
if (cursor.moveToFirst()) {
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
path = cursor.getString(column_index);
}
cursor.close();
return new File(path);
}
public static boolean isNewGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.contentprovider".equals(uri.getAuthority());
}
private File getPhotoFile(Uri selectedImageUri) {
try {
InputStream is = mActivityInstance.getContentResolver().openInputStream(selectedImageUri);
if (is != null) {
Bitmap pictureBitmap = BitmapFactory.decodeStream(is);
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
pictureBitmap.compress(Bitmap.CompressFormat.JPEG, 80, bytes);
File output = new File(FileManager.getImageCacheDir(mActivityInstance), System.currentTimeMillis() + ".jpg");
output.createNewFile();
FileOutputStream fo = new FileOutputStream(output);
fo.write(bytes.toByteArray());
fo.close();
return output;
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
FileManager 类的函数：
private static File getCacheDir(Context context) {
File cacheDir = context.getExternalFilesDir(null);
if (cacheDir != null) {
if (!cacheDir.exists())
cacheDir.mkdirs();
} else {
cacheDir = context.getCacheDir();
}
return cacheDir;
}
public static File getImageCacheDir(Context context) {
File imageCacheDir = new File(getCacheDir(context), "cache_folder");
if (!imageCacheDir.exists())
imageCacheDir.mkdirs();
return imageCacheDir;
}
您还需要在 xml 文件夹中创建新的 xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<paths>
<external-path
name="external_files"
path="." />
</paths>
然后添加新的provider清单文件：
<provider
android:name="android.support.v4.content.FileProvider"
android:authorities="${applicationId}.provider"
android:exported="false"
android:grantUriPermissions="true">
<meta-data
android:name="android.support.FILE_PROVIDER_PATHS"
android:resource="@xml/your_xml_file" />
</provider>
