我想使用API level-8中的Content Provider
和Content Observer
。我能夠在Api-15(ICS)中創建它。但我必須從Api-8支持我的應用程序。如何在API Level 8中使用Content Provider和Content Observer?
如果我提到android:minSdkVersion =「8」像這樣我得到這個錯誤 Class requires API level 11 (current min is 8): android.content.Loader
。
import android.app.ListActivity;
import android.content.ContentValues;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.EditText;
public class TodosOverviewActivity extends ListActivity implements LoaderManager.LoaderCallbacks<Cursor> {
private static final int DELETE_ID = Menu.FIRST + 1;
private ConverstationsAdapter adapter;
private EditText Enter_Text;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.todo_list);
this.getListView().setDividerHeight(2);
fillData();
registerForContextMenu(getListView());
Enter_Text = (EditText) findViewById(R.id.msg);
findViewById(R.id.send_button).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
SendInfo();
}
});
}
private void SendInfo() {
String msg = Enter_Text.getText().toString().trim();
ContentValues values = new ContentValues();
values.put(TodoTable.COLUMN_RECEIVER, "Reddy");
values.put(TodoTable.COLUMN_SENDER, "RA");
values.put(TodoTable.COLUMN_MSG, msg);
getContentResolver().insert(MyTodoContentProvider.CONTENT_URI, values);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
switch (item.getItemId()) {
case DELETE_ID:
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
Uri uri = Uri.parse(MyTodoContentProvider.CONTENT_URI + "/" + info.id);
getContentResolver().delete(uri, null, null);
fillData();
return true;
}
return super.onContextItemSelected(item);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
}
private void fillData() {
getLoaderManager().initLoader(0, null, this); // error here
adapter = new ConverstationsAdapter(TodosOverviewActivity.this, null);
setListAdapter(adapter);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
menu.add(0, DELETE_ID, 0, R.string.menu_delete);
}
// Creates a new loader after the initLoader() call
@Override
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
String[] projection = { TodoTable.COLUMN_ID, TodoTable.COLUMN_MSG };
CursorLoader cursorLoader = new CursorLoader(this,
MyTodoContentProvider.CONTENT_URI, projection, null, null, null);
return cursorLoader;
}
@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
adapter.swapCursor(data);
}
@Override
public void onLoaderReset(Loader<Cursor> loader) {
// data is not available anymore, delete reference
adapter.swapCursor(null);
}
}
我覺得問題應該是如何使用'Loader'在'API8'因爲沒有錯與'ContentProvider'和'ContentObserver'。 –
雅它在API-15中工作正常我想從Minsdk -8支持我的應用程序; –