有没有简单的方法来处理android中的内容提供程序。我的应用程序必须处理文本，图像和文档，但在添加对Google Drive内容提供商，Google相册，媒体等的支持后...... 现在，当我的应用程序与图像和文本共享Google Keep note时，我的应用程序崩溃了。
这是我现在如何使用它的片段：
public class IntentUtils {
public static String handlePDFIntent(Context context, Intent intent) {
Uri uri = intent.getParcelableExtra(Intent.EXTRA_STREAM);
if (uri != null) {
return getPath(context, uri);
}
return "";
}
public static String handleTextIntent(Intent intent) {
String sharedText = intent.getStringExtra(Intent.EXTRA_TEXT);
if (sharedText != null) {
return sharedText;
}
return "";
}
public static String handleImageIntent(Context context, Intent intent) {
Uri imageUri = intent.getParcelableExtra(Intent.EXTRA_STREAM);
if (imageUri != null) {
return getPath(context, imageUri);
}
return "";
}
public static boolean isExternalStorageRemovable() {
return Build.VERSION.SDK_INT < Build.VERSION_CODES.GINGERBREAD || Environment.isExternalStorageRemovable();
}
public static File getExternalCacheDir(Context context) {
if (hasExternalCacheDir()) {
return context.getExternalCacheDir();
}
// Before Froyo we need to construct the external cache dir ourselves
final String cacheDir = "/Android/data/" + context.getPackageName() + "/cache/";
return new File(Environment.getExternalStorageDirectory().getPath() + cacheDir);
}
public static boolean hasExternalCacheDir() {
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO;
}
@TargetApi(Build.VERSION_CODES.KITKAT)
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 format = split[0];
if ("primary".equalsIgnoreCase(format)) {
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 format = split[0];
Uri contentUri = null;
switch (format) {
case "image":
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
break;
case "video":
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
break;
case "audio":
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
break;
}
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())) {
if (isDriveStorageDocument(uri) || isPlusPhotosDocument(uri) || Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
try {
ParcelFileDescriptor parcel = context.getContentResolver().openFileDescriptor(uri, "r");
final InputStream is = new FileInputStream(parcel.getFileDescriptor());
final File cacheDir;
if (externalMemoryAvailable()) {
cacheDir = context.getExternalCacheDir();
} else {
cacheDir = context.getCacheDir();
}
final String type = context.getContentResolver().getType(uri);
String ext = "pdf";
if (type.startsWith("image")) {
if (type.toLowerCase().contains("jpg") || type.toLowerCase().contains("jpeg")) {
ext = "jpg";
} else if (type.toLowerCase().contains("png")) {
ext = "png";
}
}
cacheDir.mkdirs();
File out = new File(cacheDir, "tmp_" + System.currentTimeMillis() + "." + ext);
FileUtils.copyInputStreamToFile(is, out);
is.close();
parcel.close();
System.out.println(Uri.fromFile(out).getPath());
return Uri.fromFile(out).getPath();
} catch (IOException e) {
e.printStackTrace();
}
} else {
return getDataColumn(context, uri, null, null);
}
}
// File
else if ("file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
} else {
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 column_index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(column_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());
}
public static boolean isDriveStorageDocument(Uri uri) {
return uri.getAuthority().startsWith("com.google.android.apps.docs.storage");
}
public static boolean isKeepNote(Uri uri) {
return uri.getAuthority().startsWith("com.google.android.keep");
}
public static boolean isPlusPhotosDocument(Uri uri) {
return uri.getAuthority().startsWith("content://com.google.android.apps.photos.content");
}
/**
* @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());
}
public static boolean isPackageInstalled(String packagename, Context context) {
PackageManager pm = context.getPackageManager();
try {
pm.getPackageInfo(packagename, PackageManager.GET_ACTIVITIES);
return true;
} catch (PackageManager.NameNotFoundException e) {
return false;
}
}
public static boolean isDebuggable(Context ctx) {
boolean debuggable = false;
PackageManager pm = ctx.getPackageManager();
try {
final ApplicationInfo appinfo = pm.getApplicationInfo(ctx.getPackageName(), 0);
debuggable = (0 != (appinfo.flags & ApplicationInfo.FLAG_DEBUGGABLE));
} catch (NameNotFoundException e) {/*debuggable variable will remain false*/}
return debuggable;
}
public static boolean externalMemoryAvailable() {
return Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED);
}
}
更新1： 谷歌似乎继续使用剪贴板数据和一些blob，但我正在寻找更通用的方法来处理外部内容提供商。有什么帮助吗？