android-contentresolver

问题 I am new to andriod domain and is in learning phase. I got couple of queries: Do we have single ContentResolver object per app? Is it a singleton object? Who manages this object lifecycle? If it's singleton, how does it handles multiple request of querying a ContentProvider? 回答1: From Alex Lockwood's Blog - http://www.androiddesignpatterns.com/2012/06/content-resolvers-and-content-providers.html What is the Content Resolver? The Content Resolver is the single, global instance in your

问题 I am new to andriod domain and is in learning phase. I got couple of queries: Do we have single ContentResolver object per app? Is it a singleton object? Who manages this object lifecycle? If it's singleton, how does it handles multiple request of querying a ContentProvider? 回答1: From Alex Lockwood's Blog - http://www.androiddesignpatterns.com/2012/06/content-resolvers-and-content-providers.html What is the Content Resolver? The Content Resolver is the single, global instance in your

问题 I retrieve phonebook contacts to my application by using following code: public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Intent contactPickerIntent = new Intent(Intent.ACTION_PICK, Contacts.CONTENT_URI); startActivityForResult(contactPickerIntent, CONTACT_PICKER_RESULT); } But I want to select multiple contacts and upload those to a DB. Is this possible and if so how can I do this? 回答1: Well you could query the content

问题 I have this code to delete a Contact Group public void delete(Activity act,String[] args) { try { int b=act.getContentResolver().delete(ContactsContract.Groups.CONTENT_URI,"_ID=?", args); Toast.makeText(act, "Deleted",Toast.LENGTH_SHORT).show(); //notify registered observers that a row was updated act.getContentResolver().notifyChange(ContactsContract.Groups.CONTENT_URI, null); } catch (Exception e) { Log.v(TAG, e.getMessage(), e); Toast.makeText(act, TAG + " Delete Failed",Toast.LENGTH_LONG)

问题 I'm trying to get the path from uri. it works in devices below kitkat. I googled and found that I need to get the document Id and then query it with the gallery items. And it works. But I'm facing problem with videos. When i select the video from Videos section, it works. But When I select it from Gallery, my app crashes, giving Illegal Argument exception- Not a document type. I know why it's happening. It is because I'm looking for a document type of video in Gallery section. But how to

问题 I am making this app just for me, with api 9 and stock alarm clock. I found this: http://code.google.com/p/android-alarm-database/ and in on create of my main activity is this: ContentResolver cr = getContentResolver(); AlarmDatabase ad = new AlarmDatabase(cr); Record r = ad.getNearestEnabledAlarm(); When i use URI content://com.android.alarmclock/alarm it gives me in logcat: Cannot resolve provider for content://com.android.alarmclock/alarm Failed to find provider info for com.android

问题 I need to share an image from my RecyclerAdapter because the image does not initially exist, i.e. is loaded within the Activity making use of the adapter. How can I share the bitmap to social media? Every time I click share in my app it says "No apps can perform this action". feedItemView.setFeedSocialShareClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // Share to Social Media ImageView imageView = (ImageView) feedItemView.findViewById(R.id.image); Drawable

问题 I need to share an image from my RecyclerAdapter because the image does not initially exist, i.e. is loaded within the Activity making use of the adapter. How can I share the bitmap to social media? Every time I click share in my app it says "No apps can perform this action". feedItemView.setFeedSocialShareClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // Share to Social Media ImageView imageView = (ImageView) feedItemView.findViewById(R.id.image); Drawable

问题 I created two content providers that work on two different tables of the same SQLite database. They share a single instance of SQLiteOpenHelper as described in the post of Ali Serghini. Each content provider is registered in AndroidManifest.xml as follows. <provider android:name=".contentprovider.PostsContentProvider" android:authorities="com.example.myapp.provider" android:exported="false" android:multiprocess="true" > </provider> <provider android:name=".contentprovider

问题 I created two content providers that work on two different tables of the same SQLite database. They share a single instance of SQLiteOpenHelper as described in the post of Ali Serghini. Each content provider is registered in AndroidManifest.xml as follows. <provider android:name=".contentprovider.PostsContentProvider" android:authorities="com.example.myapp.provider" android:exported="false" android:multiprocess="true" > </provider> <provider android:name=".contentprovider