自定义ContentProvider的简单增删除改

自定义一个类继承ContentProvider（内容提供者）重新里面的六个方法，通过

getContentResolver()来调用ContentProvider（内容提供者）中的方法

private DbHelper dbHelper;

private SQLiteDatabase sqLiteDatabase;
private UriMatcher uriMatcher;

@Override
public boolean onCreate() {
Log.i("test","onCreate");
dbHelper = new DbHelper(getContext(),"person.db",null,2);
sqLiteDatabase = dbHelper.getReadableDatabase();
return false;
}

@Nullable
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
Log.i("test","query1111");
return sqLiteDatabase.query(false,"person",projection,selection,selectionArgs,null,null,sortOrder,null);
}

@Nullable
@Override
public String getType(Uri uri) {
Log.i("test","getType");
return null;
}

@Nullable
@Override
public Uri insert(Uri uri, ContentValues values) {
Log.i("test","insert");
sqLiteDatabase.insert("person","name",values);
return null;
}

@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
Log.i("test","delete");
sqLiteDatabase.delete("person",selection,selectionArgs);
return 0;
}

@Override
public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
Log.i("test","update");
sqLiteDatabase.update("person",values,selection,selectionArgs);
return 0;
}

内容访问者：
添加数据

public void add(View view){
String name=t_main_name.getText().toString();//获取EditText中name的值
String age=et_main_age.getText().toString();  //获取EditText中age的值
uri = Uri.parse("content://com.example.android_16_sqlite.PERSONS");//
//保存到数据库中
ContentValues values=new ContentValues();//Map
values.put("name",name);
values.put("age",age);
values.putNull("_id");
cr.insert(uri,values);
}

查询所有数据
public void getDate(View view){ //查询所有 //协议：content:// uri = Uri.parse("content://com.example.android_16_sqlite.PERSONS"); //查询数据 cursor = cr.query(uri,null,null,null,null); while (cursor.moveToNext()){ int pid= cursor.getInt(cursor.getColumnIndex("_id")); String sname= cursor.getString(cursor.getColumnIndex("name")); int age= cursor.getInt(cursor.getColumnIndex("age")); } PersonDate();}
修改数据

public void update(View view){
String id=editText.getText().toString();
String name=t_main_name.getText().toString();
String age=et_main_age.getText().toString();
uri = Uri.parse("content://com.example.android_16_sqlite.PERSONS");
//要修改的值保存到数据库中
ContentValues values=new
996f
ContentValues();//Map
values.put("name",name);
values.put("age",age);
cr.update(uri,values,"_id=?",new String[]{id+""});
}

删除数据

public void delete(View view){
String id=editText.getText().toString();
uri = Uri.parse("content://com.example.android_16_sqlite.PERSONS");
cr.delete(uri,"_id=?",new String[]{id+""});
}