Android sqlite 数据库查询，插入，删除，更新demo<第5章>---删除

根据第2章，删除数据库中的数据，实际调用SQLiteDatabase的delete()方法



布局文件：delete_userdata_dialog.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:padding="10px"

>

<LinearLayout

android:id="@+id/linearlayout_input_userid"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="horizontal" >

<TextView

android:id="@+id/userid"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:text="input id:" />

<EditText

android:id="@+id/input_useid"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:numeric="integer" />

</LinearLayout>

<Button

android:id="@+id/input_userid_commit"

android:layout_below="@id/linearlayout_input_userid"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_alignParentRight="true"

android:text="commit"/>

</RelativeLayout>

并在AndroidManifest.xml配置文件，修改theme = “@android:style/Theme.Dialog”

Activity： 上代码：

package com.example.listviewdatabase;

import android.app.Activity;

import android.database.sqlite.SQLiteDatabase;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

public class DeleteUserDataDialog extends Activity {

private Button commit = null;

private EditText input_userid = null;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.delete_userdata_dialog);

commit = (Button) findViewById(R.id.input_userid_commit);

commit.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View arg0) {

// TODO Auto-generated method stub

input_userid = (EditText) findViewById(R.id.input_useid);

int user_id = Integer.parseInt(input_userid.getText()

.toString());

DataBaseHelper dbh = new DataBaseHelper(

DeleteUserDataDialog.this, null);

SQLiteDatabase db = dbh.getWritableDatabase();

dbh.deleteUserDataToDataBase(db, user_id);

db.close();

dbh.close();

DeleteUserDataDialog.this.finish();

}

});

}

}

其中DataBaseHelper中delete()函数

public void deleteUserDataToDataBase(SQLiteDatabase db,int id){

Log.i(TAG, "id = "+id);

String[] args = {String.valueOf(id)};

db.delete(TABLE_NAME, "_id=?", args); // _id是表中列，args不能写成 new String[]{"id"}

}

此文章是本人学习笔记，能力有限，相互学习，欢迎点评，谢谢...