ContentPRovider示例
1,创建数据库
package com.contentprovider.db;
import android.content.ContentValues;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DBHelper extends SQLiteOpenHelper {
private static final String DB_NAME = "test.db";
private static final String TABLE_NAME = "person";
private static final int VERSION_CODE = 999;
public DBHelper(Context context) {
super(context, DB_NAME, null, VERSION_CODE);
}
@Override
public void onCreate(SQLiteDatabase db) {
String sql = "CREATE TABLE "
+ TABLE_NAME
+ " (id Integer primary key autoincrement, name varchar(10),sex varchar(10),age Integer);";
db.execSQL(sql);
initDB(db);
}
private void initDB(SQLiteDatabase db) {
ContentValues values = new ContentValues();
for (int i = 1; i <= 10; i++) {
values.put("name", "zhangsan" + i);
if (i % 2 == 0) {
values.put("sex", "male");
} else {
values.put("sex", "female");
}
values.put("age", i + 30);
db.insert(TABLE_NAME, "id", values);
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
2,封装PersonPrivider
package com.contentprovider.provider;
import com.contentprovider.db.DBHelper;
import android.content.ContentProvider;
import android.content.ContentValues;
import android.content.UriMatcher;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.util.Log;
import android.view.View;
public class PersonProvider extends ContentProvider {
private static final String TAG = "PersonProvider";
private static final String AUTHORITY = "com.contentprovider.provider";
private static final String TABLE_NAME = "person";
private static UriMatcher mUriMatcher;
private DBHelper mHelper = null;
private static final int PERSON_ONE_RECORD = 1;
private static final int PERSON_ALL_RECORDS = 2;
private SQLiteDatabase mDb;
static {
mUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
mUriMatcher.addURI(AUTHORITY, TABLE_NAME, PERSON_ALL_RECORDS);
mUriMatcher.addURI(AUTHORITY, TABLE_NAME + "/*", PERSON_ONE_RECORD);
}
@Override
public boolean onCreate() {
Log.i(TAG, "PersonProvider被创建 了");
mHelper = new DBHelper(getContext());
mDb = mHelper.getReadableDatabase();
return false;
}
@Override
public String getType(Uri uri) {
return null;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection,
String[] selectionArgs, String sortOrder) {
Cursor cursor = null;
switch (mUriMatcher.match(uri)) {
// 查询全部记录
case PERSON_ALL_RECORDS:
// 查询一条记录
case PERSON_ONE_RECORD:
cursor = mDb.query(TABLE_NAME, projection, selection,
selectionArgs, null, null, null);
break;
// 未匹配到合适的uri
default:
throw new IllegalArgumentException("未匹配到合适的uri");
}
return cursor;
}
@Override
public Uri insert(Uri uri, ContentValues values) {
switch (mUriMatcher.match(uri)) {
case PERSON_ALL_RECORDS:
case PERSON_ONE_RECORD:
mDb.insert(TABLE_NAME, "id", values);
break;
default:
throw new IllegalArgumentException("未匹配到合适的uri");
}
return uri;
}
@Override
public int delete(Uri uri, String selection, String[] selectionArgs) {
int result = 0;
switch (mUriMatcher.match(uri)) {
case PERSON_ALL_RECORDS:
case PERSON_ONE_RECORD:
result = mDb.delete(TABLE_NAME, selection, selectionArgs);
break;
default:
throw new IllegalArgumentException("未匹配到合适的uri");
}
return result;
}
@Override
public int update(Uri uri, ContentValues values, String selection,
String[] selectionArgs) {
switch (mUriMatcher.match(uri)) {
case PERSON_ALL_RECORDS:
case PERSON_ONE_RECORD:
mDb.update(TABLE_NAME, values, selection, selectionArgs);
break;
default:
throw new IllegalArgumentException("未匹配到合适的uri");
}
return 0;
}
}
3,测试封装结果
package com.contentprovider.demo;
import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import com.contentprovider.db.DBHelper;
import com.example.contentproviderdemo.R;
public class MainActivity extends Activity implements OnClickListener {
private static final String TABLE_NAME = "person";
private static final String AUTHORITY = "com.contentprovider.provider";
private static final String TAG = "MainActivity";
private Uri mBaseUri = Uri.parse("content://" + AUTHORITY + "/"
+ TABLE_NAME);
private Button mBtSingleQuery;
private Button mBtMutiQuery;
private Button mBtSingleDelete;
private Button mBtMutiDelete;
private Button mBtMutiInsert;
private Button mBtSingleInsert;
private Button mBtMutiUpdate;
private Button mBtSingleUpdate;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
}
private void initView() {
mBtSingleQuery = (Button) findViewById(R.id.bt_single_query);
mBtMutiQuery = (Button) findViewById(R.id.bt_muti_query);
mBtSingleDelete = (Button) findViewById(R.id.bt_single_delete);
mBtMutiDelete = (Button) findViewById(R.id.bt_muti_delete);
mBtMutiInsert = (Button) findViewById(R.id.bt_muti_insert);
mBtSingleInsert = (Button) findViewById(R.id.bt_single_insert);
mBtMutiUpdate = (Button) findViewById(R.id.bt_muti_update);
mBtSingleUpdate = (Button) findViewById(R.id.bt_single_update);
mBtSingleQuery.setOnClickListener(this);
mBtMutiQuery.setOnClickListener(this);
mBtSingleDelete.setOnClickListener(this);
mBtMutiDelete.setOnClickListener(this);
mBtMutiInsert.setOnClickListener(this);
mBtSingleInsert.setOnClickListener(this);
mBtMutiUpdate.setOnClickListener(this);
mBtSingleUpdate.setOnClickListener(this);
}
private void queryOneRecord() {
Uri uri = Uri.withAppendedPath(mBaseUri, "/" + 3);
String sub = uri.toString().substring(
uri.toString().lastIndexOf("/") + 1);
Log.i(TAG, "sub = " + sub);
Cursor cursor = getContentResolver().query(uri, null, "id=?",
new String[] { sub }, null);
int countColumns = cursor.getColumnCount();
while (cursor.moveToNext()) {
for (int i = 0; i < countColumns; i++) {
Log.i(TAG, "单行:" + cursor.getString(i));
}
}
cursor.close();
}
private void queryAllRecords() {
Cursor cursor = getContentResolver().query(mBaseUri, null, null, null,
null);
int countColumns = cursor.getColumnCount();
while (cursor.moveToNext()) {
for (int i = 1; i < countColumns; i++) {
Log.i(TAG,
"行:" + cursor.getString(0) + "----->"
+ cursor.getString(i));
}
Log.i(TAG, "================================");
}
cursor.close();
}
private int deleteMutiRecords() {
int result = getContentResolver().delete(mBaseUri, null, null);
return result;
}
private int deleteSingleRecord() {
Uri uri = Uri.withAppendedPath(mBaseUri, "/" + 3);
String sub = uri.toString().substring(
uri.toString().lastIndexOf("/") + 1);
return getContentResolver().delete(uri, "id=?", new String[] { sub });
}
private void insertSingleRecord() {
Uri uri = Uri.withAppendedPath(mBaseUri, "/" + 11);
ContentValues values = new ContentValues();
values.put("name", "fengqingyang");
values.put("sex", "female");
values.put("age", 40);
getContentResolver().insert(uri, values);
}
private void insertMutiRecords() {
ContentValues values = new ContentValues();
for (int i = 60; i < 70; i++) {
values.put("name", "fengqingyang" + i);
values.put("sex", "female");
values.put("age", i);
getContentResolver().insert(mBaseUri, values);
values.clear();
}
}
private void updateSingleRecord() {
ContentValues values = new ContentValues();
values.put("name", "linghuchong");
values.put("sex", "female");
values.put("age", 45);
getContentResolver().update(mBaseUri, values , "id=?", new String[]{"5"});
}
private void updateMutiRecords() {
ContentValues values = new ContentValues();
for(int i=0; i<3; i++){
values.put("name", "renyingying"+i);
values.put("sex", "male");
values.put("age", 55+i);
getContentResolver().update(mBaseUri, values , "id=?", new String[]{(i+1)+""});
values.clear();
}
}
@Override
public void onClick(View v) {
int result = -1;
switch (v.getId()) {
case R.id.bt_single_query:
queryOneRecord();
break;
case R.id.bt_muti_query:
queryAllRecords();
break;
case R.id.bt_single_delete:
result = deleteSingleRecord();
Log.i(TAG, "影响的行数::" + result);
Log.i(TAG, "再次查询看结果");
queryAllRecords();
break;
case R.id.bt_muti_delete:
result = deleteMutiRecords();
Log.i(TAG, "影响的行数::" + result);
Log.i(TAG, "再次查询看结果");
queryAllRecords();
break;
case R.id.bt_single_insert:
insertSingleRecord();
Log.i(TAG, "查看单行结果插入");
queryAllRecords();
break;
case R.id.bt_muti_insert:
insertMutiRecords();
Log.i(TAG, "查看多行结果插入");
queryAllRecords();
break;
case R.id.bt_muti_update:
Log.i(TAG,"多行更新前");
queryAllRecords();
Log.i(TAG,"多行更新后");
updateMutiRecords();
queryAllRecords();
break;
case R.id.bt_single_update:
Log.i(TAG,"单行更新前");
queryAllRecords();
Log.i(TAG,"单行更新后");
updateSingleRecord();
queryAllRecords();
break;
default:
break;
}
}
}
工程下载地址: http://download.csdn.net/detail/qizhukanhai2/7191111