Intent intent=new Intent(Intent.ACTION_GET_CONTENT);//ACTION_OPEN_DOCUMENT intent.addCategory(Intent.CATEGORY_OPENABLE); intent.setType("image/jpeg"); if(android.os.Build.VERSION.SDK_INT>=android.os.Build.VERSION_CODES.KITKAT){ startActivityForResult(intent, SELECT_PIC_KITKAT); }else{ startActivityForResult(intent, SELECT_PIC); }
爲什麼要分開不同版本呢?其實在4.3或以下可以直接用ACTION_GET_CONTENT的,在4.4或以上,官方建議用ACTION_OPEN_DOCUMENT,但其實都不算太大區別,區別是他們返回的Uri,那個才叫大區別.這就是困擾了我一整天的問題所在了.
4.3或以下,選了圖片之後,根據Uri來做處理,很多帖子都有了,我就不詳細說了.主要是4.4,如果使用上面pick的原生方法來選圖,返回的uri還是正常的,但如果用ACTION_GET_CONTENT的方法,返回的uri跟4.3是完全不一樣的,4.3返回的是帶文件路徑的,而4.4返回的卻是content://com.android.providers.media.documents/document/image:3951這樣的,沒有路徑,只有圖片編號的uri.這就導致接下來無法根據圖片路徑來裁剪的步驟了.
還好找了很多方法,包括加權限啊什麼的,中間還試過用一些方法,自己的app沒崩潰,倒是讓系統圖庫崩潰了,引發了java.lang.SecurityException,
Caused by: java.lang.SecurityException: Permission Denial: opening provider com.android.providers.media.MediaDocumentsProvider from ProcessRecord{437b5d88 9494:com.google.android.gallery3d/u0a20} (pid=9494, uid=10020) requires android.permission.MANAGE_DOCUMENTS or android.permission.MANAGE_DOCUMENTS
看來4.4的系統還是有些bug.重點來了,4.4得到的uri,需要以下方法來獲取文件的路徑
public static String getPath(final Context context, final Uri uri) {
final boolean isKitKat = Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT;
// DocumentProvider
if (isKitKat && DocumentsContract.isDocumentUri(context, uri)) {
// ExternalStorageProvider
if (isExternalStorageDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
// TODO handle non-primary volumes
}
// DownloadsProvider
else if (isDownloadsDocument(uri)) {
final String id = DocumentsContract.getDocumentId(uri);
final Uri contentUri = ContentUris.withAppendedId(
Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(context, contentUri, null, null);
}
// MediaProvider
else if (isMediaDocument(uri)) {
final String docId = DocumentsContract.getDocumentId(uri);
final String[] split = docId.split(":");
final String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
final String selection = "_id=?";
final String[] selectionArgs = new String[] {
split[1]
};
return getDataColumn(context, contentUri, selection, selectionArgs);
}
}
// MediaStore (and general)
else if ("content".equalsIgnoreCase(uri.getScheme())) {
// Return the remote address
if (isGooglePhotosUri(uri))
return uri.getLastPathSegment();
return getDataColumn(context, uri, null, null);
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
/**
* Get the value of the data column for this Uri. This is useful for
* MediaStore Uris, and other file-based ContentProviders.
*
* @param context The context.
* @param uri The Uri to query.
* @param selection (Optional) Filter used in the query.
* @param selectionArgs (Optional) Selection arguments used in the query.
* @return The value of the _data column, which is typically a file path.
*/
public static String getDataColumn(Context context, Uri uri, String selection,
String[] selectionArgs) {
Cursor cursor = null;
final String column = "_data";
final String[] projection = {
column
};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs,
null);
if (cursor != null && cursor.moveToFirst()) {
final int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}
/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
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這樣,就可以在4.4上用漂亮的圖片選擇器,選到我們想要的文件,又不會出問題了.
昨天發現了個bug,如果在4.4上面不用"圖片"來選,用"圖庫"來選,就會無法讀取到圖片路徑,所以只需要加個判斷,如果是用舊方式來選,就用舊方式來讀,就是如果
DocumentsContract.isDocumentUri(context, uri) 返回false的話,就用舊的方式
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public static String selectImage(Context context,Intent data){
Uri selectedImage = data.getData();
// Log.e(TAG, selectedImage.toString());
if(selectedImage!=null){
String uriStr=selectedImage.toString();
String path=uriStr.substring(10,uriStr.length());
if(path.startsWith("com.sec.android.gallery3d")){
Log.e(TAG, "It's auto backup pic path:"+selectedImage.toString());
return null;
}
}
String[] filePathColumn = { MediaStore.Images.Media.DATA };
Cursor cursor = context.getContentResolver().query(selectedImage,filePathColumn, null, null, null);
cursor.moveToFirst();
int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
String picturePath = cursor.getString(columnIndex);
cursor.close();
return picturePath;
}
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