package com.example.zsgc1;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity implements View.OnClickListener {
MyHelper myHelper;
private EditText mEtName;
private EditText mEtPhone;
private TextView mTvShow;
private Button mBtnAdd;
private Button mBtnQuery;
private Button mBtnUpdate;
private Button mBtnDelete;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myHelper=new MyHelper(this);
init();
}
private void init(){
mEtName=(EditText)findViewById(R.id.et_name);
mEtPhone=(EditText)findViewById(R.id.et_phone);
mTvShow=(TextView)findViewById(R.id.tv_show);
mBtnAdd=(Button)findViewById(R.id.btn_add);
mBtnQuery=(Button)findViewById(R.id.btn_query);
mBtnUpdate=(Button)findViewById(R.id.btn_update);
mBtnDelete=(Button)findViewById(R.id.btn_delete);
mBtnAdd.setOnClickListener(this);
mBtnQuery.setOnClickListener(this);
mBtnUpdate.setOnClickListener(this);
mBtnDelete.setOnClickListener(this);
}
public void onClick(View view){
String name,phone;
SQLiteDatabase db;
ContentValues values;
switch (view.getId()){
case R.id.btn_add:
name=mEtName.getText().toString();
phone=mEtPhone.getText().toString();
db=myHelper.getWritableDatabase();
values=new ContentValues();
values.put("name",name);
values.put("phone",phone);
db.insert("information",null,values);
Toast.makeText(this,"信息已添加",Toast.LENGTH_LONG).show();
db.close();
break;
case R.id.btn_query:
db=myHelper.getReadableDatabase();
Cursor cursor=db.query("information",null,null,null,null,null,null);
if (cursor.getCount()==0){
mTvShow.setText("");
Toast.makeText(this,"没有数据",Toast.LENGTH_LONG).show();
}else {
cursor.moveToFirst();
mTvShow.setText("Name:"+cursor.getString(1)+"Tel:"+cursor.getString(2));
}
while (cursor.moveToNext()){
mTvShow.append("\n"+"Name:"+cursor.getString(1)+"Tel:"+cursor.getString(2));
}
cursor.close();
db.close();
break;
case R.id.btn_update:
db=myHelper.getWritableDatabase();
values=new ContentValues();
values.put("phone",phone=mEtPhone.getText().toString());
db.update("information",values,"name=?",new String[]{mEtName.getText().toString()});
Toast.makeText(this,"信息已修改",Toast.LENGTH_LONG).show();
db.close();
break;
case R.id.btn_delete:
db=myHelper.getWritableDatabase();
db.delete("information","name=?",new String[]{mEtName.getText().toString()});
Toast.makeText(this,"信息已删除",Toast.LENGTH_LONG).show();
mTvShow.setText("");
db.close();
break;
}
}
class MyHelper extends SQLiteOpenHelper{
public MyHelper(Context context){
super(context,"itcast.db",null,1);
}
public void onCreate(SQLiteDatabase db){
db.execSQL("CREATE TABLE information(_id INTEGER PRIMARY KEY AUTOINCREMENT,name VARCHAR(20),phone VARCHAR(20))");
}
public void onUpgrade(SQLiteDatabase db,int oldVersion,int newVersion){
}
}
}
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.zsgc1.MainActivity" >
<Button
android:id="@+id/btn_add"
android:layout_width="60dp"
android:layout_height="40dp"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_marginBottom="121dp"
android:text="添加"
android:onClick="CCC"/>
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_marginTop="150dp"
android:layout_marginLeft="10dp"
android:text="姓名" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_marginTop="220dp"
android:layout_marginLeft="10dp"
android:text="电话" />
<EditText
android:id="@+id/et_name"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_marginTop="130dp"
android:layout_marginLeft="50dp"
/>
<EditText
android:id="@+id/et_phone"
android:layout_width="80dp"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_marginTop="200dp"
android:layout_marginLeft="50dp"
/>
<TextView
android:id="@+id/tv_show"
android:layout_width="150dp"
android:layout_height="60dp"
android:layout_alignParentBottom="true"
android:layout_alignRight="@+id/button3"
android:layout_marginBottom="55dp"
android:layout_marginRight="23dp"
android:text="" />
<Button
android:id="@+id/btn_query"
android:layout_width="60dp"
android:layout_height="40dp"
android:layout_alignBaseline="@+id/btn_delete"
android:layout_alignBottom="@+id/btn_delete"
android:layout_toRightOf="@+id/btn_add"
android:onClick="CCC"
android:text="查询" />
<Button
android:id="@+id/btn_update"
android:layout_width="60dp"
android:layout_height="40dp"
android:layout_alignBaseline="@+id/btn_query"
android:layout_alignBottom="@+id/btn_query"
android:layout_toRightOf="@+id/btn_query"
android:onClick="CCC"
android:text="修改" />
<Button
android:id="@+id/btn_delete"
android:layout_width="60dp"
android:layout_height="40dp"
android:layout_alignBaseline="@+id/btn_add"
android:layout_alignBottom="@+id/btn_add"
android:layout_toRightOf="@+id/btn_update"
android:onClick="CCC"
android:text="删除" />
</RelativeLayout>
