我有两个应用程序,来自另一个应用程序我想要获取所有图像, 假设有StickerProvider和MainActivity不同的应用程序
StickerProvider是ContentProvider,MainActivity有ContentResolver
StickerProvider App有资产文件夹
资产---->贴纸----------> a.png,b.png
public class StickerProvider extends ContentProvider {
private final static String LOG_TAG = StickerProvider.class.getName();
private static final String[] COLUMNS = {
OpenableColumns.DISPLAY_NAME, OpenableColumns.SIZE};
@Override
public boolean onCreate() {
return true;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
/**
* Source: {@link FileProvider#query(Uri, String[], String, String[], String)} .
*/
if (projection == null) {
projection = COLUMNS;
}
String[] images = new String[0];
try {
images = getContext().getAssets().list("stickers");
ArrayList<String> listImages = new ArrayList<String>(Arrays.asList(images));
final MatrixCursor cursor = new MatrixCursor(new String[]{"path"}, 1);
for (int i = 0; i < listImages.size(); i++) {
cursor.addRow(new String[]{listImages.get(i)});
}
return cursor;
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
public String getType(Uri uri) {
/**
* Source: {@link FileProvider#getType(Uri)} .
*/
final String file_name = uri.getLastPathSegment();
final int lastDot = file_name.lastIndexOf('.');
if (lastDot >= 0) {
final String extension = file_name.substring(lastDot + 1);
final String mime = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
if (mime != null) {
return mime;
}
}
return "image/png";
}
@Override
public Uri insert(Uri uri, ContentValues values) {
return null;
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
return 0;
}
@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
return 0;
}
}
它的清单文件是
<provider
android:name="com.example.StickerProvider"
android:authorities="com.example"
android:exported="true"
android:grantUriPermissions="true"
android:label="StickerProvider" />
另一款应用是MainActivity ------&gt;从此我想获取上述应用程序的所有图像
public class MainActivity extends AppCompatActivity {
int i=0;
private static final String TAG = "MainActivity";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ImageView ivOne = (ImageView)findViewById(R.id.ivOne);
ImageView ivTwo = (ImageView)findViewById(R.id.ivTwo);
try {
ContentResolver resolver = getContentResolver();
Cursor cursor =
resolver.query(Uri.parse("content://com.example/stickers"),
null,
null,
null,
null);
if (cursor.moveToFirst()) {
do {
String word = cursor.getString(0);
if(i==0){
ivOne.setImageURI(Uri.parse("content://com.example/stickers/"+word));
}else if(i==1){
ivTwo.setImageURI(Uri.parse("content://com.example/stickers/"+word));
}
// do something meaningful
Log.d(TAG, "onCreate: "+word);
} while (cursor.moveToNext());
}
}catch(Exception e){
e.printStackTrace();
}
}
}
当我启动MainActivity App时,我会遇到异常
Unable to open content: content://com.example/a.png
java.io.FileNotFoundException: No files supported by provider at content://com.example/a.png
at android.database.DatabaseUtils.readExceptionWithFileNotFoundExceptionFromParcel(DatabaseUtils.java:144)
at android.content.ContentProviderProxy.openTypedAssetFile(ContentProviderNative.java:692)
at android.content.ContentResolver.openTypedAssetFileDescriptor(ContentResolver.java:1149)
at android.content.ContentResolver.openAssetFileDescriptor(ContentResolver.java:986)
at android.content.ContentResolver.openInputStream(ContentResolver.java:706)
at android.widget.ImageView.getDrawableFromUri(ImageView.java:900)
at android.widget.ImageView.resolveUri(ImageView.java:871)
at android.widget.ImageView.setImageURI(ImageView.java:490)
at android.support.v7.widget.AppCompatImageView.setImageURI(AppCompatImageView.java:124)
at com.pixr.photo.collage.MainActivity.onCreate(MainActivity.java:36)
at android.app.Activity.performCreate(Activity.java:6684)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1119)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2652)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2766)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1507)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6236)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:891)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:781)
答案 0 :(得分:1)
ivOne.setImageURI(Uri.parse("content://com.example/stickers/"+word));
您的ContentProvider
不支持此功能。它没有实现openFile()
或其任何变体。
或者:
使用支持服务资产的现有ContentProvider
,例如my StreamProvider
或
增加您的提供商以支持openFile()
,例如this sample app
答案 1 :(得分:0)
ic_launcher与app图标有关。没有应用程序图标。检查可绘制目录中的图标。