MySQLiteOpenHelper类
public class MySQLiteOpenHelper extends SQLiteOpenHelper {
public MySQLiteOpenHelper(Context context) {
super(context, "person.db", null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table info (_id integer primary key autoincrement,name varchar(20))");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
MyContentProvider类
public class MyContentProvider extends ContentProvider {
private static UriMatcher matcher= new UriMatcher(UriMatcher.NO_MATCH);
private static final int SUCCESS=1;
static {
matcher.addURI("com.example.mycontentprovider","info",SUCCESS);
}
private MySQLiteOpenHelper myhelper;
public MyContentProvider() {
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
if(matcher.match(uri)==SUCCESS){
SQLiteDatabase db =myhelper.getWritableDatabase();
int id=db.delete("info",selection,selectionArgs);
db.close();
return id;
}else{
throw new IllegalArgumentException("路径不匹配");
}
}
@Override
public String getType(Uri uri) {
// TODO: Implement this to handle requests for the MIME type of the data
// at the given URI.
throw new UnsupportedOperationException("Not yet implemented");
}
@Override
public Uri insert(Uri uri, ContentValues values) {
if(matcher.match(uri)==SUCCESS){
SQLiteDatabase db = myhelper.getWritableDatabase();
long id=db.insert("info",null,values);
if(id>0){
Uri newUri = ContentUris.withAppendedId(uri,id);
return newUri;
}
db.close();
return uri;
}else{
throw new IllegalArgumentException("路径不匹配");
}
}
@Override
public boolean onCreate() {
// TODO: Implement this to initialize your content provider on startup.
myhelper= new MySQLiteOpenHelper(getContext());
return false;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
if(matcher.match(uri)==SUCCESS){
SQLiteDatabase db = myhelper.getReadableDatabase();
Cursor c= db.query("info",projection,selection,selectionArgs,null,null,sortOrder);
return c;
}else{
throw new IllegalArgumentException("路径不匹配");
}
}
@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
if(matcher.match(uri)==SUCCESS){
SQLiteDatabase db = myhelper.getWritableDatabase();
int id=db.update("info",values,selection,selectionArgs);
db.close();
return id;
}else{
throw new IllegalArgumentException("路径不匹配");
}
}
}
MainActivity类
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
MySQLiteOpenHelper myhelper = new MySQLiteOpenHelper(this);
SQLiteDatabase db= myhelper.getWritableDatabase();
for(int i=0;i<3;i++){
ContentValues values = new ContentValues();
values.put("name","abc"+i);
db.insert("info",null,values);
}
db.close();
}
}
AndroidMainifest.xml文件
<provider
android:name=".MyContentProvider"
android:authorities="com.example.mycontentprovider"
android:enabled="true"
android:exported="true"></provider>
