androidx.appcompat.app.AppCompatActivity; import android.content.ContentResolver; import android.database.Cursor

=null){String[]columnNames=cursor.getColumnNames();while(cursor.moveToNext()){for(StringcolumnName:columnNames

()){user=newUser();intuserId=cursor.getInt(cursor.getColumnIndex(UserDatabaseHelper.FIELD_ID));user.set_id

import android.annotation.SuppressLint; import android.content.ContentResolver; import android.database.Cursor

importandroid.content.ContentResolver;importandroid.content.pm.PackageManager;importandroid.database.Cursor

mImagesItems.clear()//先清理一次varinstance=getInstance(this)instance.initLoader(LOADER_ID,null,object:LoaderCallbacks<Cursor

,null,null,null); cursor.moveToFirst(); db.close(); return cursor; }

//防止Sql注入 String sql = "select * from " + Constants.TABLE_NAME; //db.execSQL(sql); Cursor

cursor = db.rawQuery(sql, null); while (cursor.moveToNext()){ int index = cursor.getColumnIndex

cursor = null; try { cursor = context.getContentResolver().query(uri, projection

packagecom.example.myapplication;importandroid.content.ContentValues;importandroid.content.Context;importandroid.database.Cursor

>(){@NonNull@OverridepublicLoader<Cursor>onCreateLoader(intid,@NullableBundleargs){if(id==LOADER_ID

()){intindex=cursor.getColumnIndex("name");Stringname=cursor.getString(index);Log.d(TAG,name

getWrite都是报错 空指针 String path = null; String[] selection = {String.valueOf(nowPosition - 1)}; Cursor

MainActivity: onClick

2021-11-29 07:31:15.271 5562-5562/com.example.testprovider D/MainActivity: cursor

()){SMSBeansmsBean=newSMSBean();smsBean.set_id(cursor.getString(cursor.getColumnIndex("_id"

()){Log.d(TAG,"idis-->"+cursor.getInt(0));Log.d(TAG,"nameis-->"+cursor.getString

()){Stringid=cursor.getString(0);Stringusername=cursor.getString(1);Stringpassword=cursor.getString(3

();cursor.moveToFirst();while(cursor.moveToNext()){for(StringcolumnName:columnNames){Log.d(TAG,columnName

因为这个方法相对其他方法，可以返回一个Cursor，返回格式限制较小接收方面，也提供了较多可选位置请求路径格式：content://authorities/api/内容提供者id/方法名?

packagecom.sunofbeaches.providertestdemo;importandroid.content.ContentResolver;importandroid.database.Cursor

_ID,};@NonNull@OverridepublicLoader<Cursor>onCreateLoader(inti,@NullableBundlebundle){if(i==LOADER_ALL

img src="https://images.sunofbeaches.com/content/2021_06_07/851579081681010688.png">2021-06-07 21:53 · 安卓自定义view