使用SimpleCursorAdapter自定义ListView版面:
static final String[] FROM=new String[]{"name","phone","email"};
adapter=new SimpleCursorAdapter(this,R.layout.item,cur,FROM,
new int[]{R.id.name,R.id.phone,R.id.email},0);
FROM数组中的字段会对应到
new int[]{R.id.name,R.id.phone,R.id.email}所指的TextView。
说、所以数据库表的_id字段的用处:SimpleCursorAdapter要辨别当前在用户界面“List View”中被选用的选项代表哪个数据,其内部设计就是使用_id字段,所以我们的Cuosor要包含此字段才能让它正常运行。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Main2ActivityHotLine">
<ListView
android:id="@+id/lv"
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="20dp">
</ListView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/textview"
android:text="姓名"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="4"
android:hint="请输入姓名"
android:inputType="textPersonName"
android:id="@+id/etName"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/textview2"
android:text="电话"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="4"
android:hint="(02)111222111222"
android:inputType="phone"
android:id="@+id/etPhone"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="@+id/textview3"
android:text="Email"
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="4"
android:hint="[email protected]"
android:inputType="textEmailAddress"
android:id="@+id/etEmail"/>
</LinearLayout>
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="@+id/btInsert"
android:text="新增"
android:onClick="onInsertUpdate"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content" />
<Button
android:id="@+id/btUpdate"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:onClick="onInsertUpdate"
android:text="更新" />
<Button
android:id="@+id/btDelete"
android:text="删除"
android:onClick="onDelete"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content" />
<ImageButton
android:src="@android:drawable/stat_sys_phone_call"
android:onClick="call"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content" />
<ImageButton
android:src="@android:drawable/sym_action_email"
android:onClick="mail"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content" />
</LinearLayout>
</LinearLayout>
package com.example.mbenben.newotherapp;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.support.v4.widget.SimpleCursorAdapter;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import static com.example.mbenben.newotherapp.Main2ActivitySQLite.db_name;
import static com.example.mbenben.newotherapp.Main2ActivitySQLite.tb_name;
public class Main2ActivityHotLine extends AppCompatActivity implements AdapterView.OnItemClickListener, AdapterView.OnItemLongClickListener{
static final String DB_NAME="HotlineDB";
static final String TB_NAME="hotlist";
static final int MAX=8;
static final String[] FROM=new String[]{"name","phone","email"};
SQLiteDatabase db;
Cursor cur;
SimpleCursorAdapter adapter;
EditText etName,etPhone,etEmail;
Button btInsert,btUpdate,btDelete;
ListView lv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2_hot_line);
etName=(EditText)findViewById(R.id.etName);
etPhone=(EditText)findViewById(R.id.etPhone);
etEmail=(EditText)findViewById(R.id.etEmail);
btInsert=(Button)findViewById(R.id.btInsert);
btUpdate=(Button)findViewById(R.id.btUpdate);
btDelete=(Button)findViewById(R.id.btDelete);
db=openOrCreateDatabase(DB_NAME, Context.MODE_PRIVATE,null);
String createTable="CREATE TABLE IF NOT EXISTS "+TB_NAME+
"(_id INTEGER PRIMARY KEY AUTOINCREMENT,"+
"name VARCHAR(32),"+
"phone VARCHAR(16),"+
"email VARCHAR(64))";
db.execSQL(createTable);
cur=db.rawQuery("SELECT * FROM "+TB_NAME,null);
if(cur.getCount()==0){
addData("广州大学","10086","[email protected]");
addData("djksdj","134141051085","[email protected]");
}
adapter=new SimpleCursorAdapter(this,R.layout.item,cur,FROM,
new int[]{R.id.name,R.id.phone,R.id.email},0);
lv=findViewById(R.id.lv);
lv.setAdapter(adapter);
lv.setOnItemClickListener(this);
lv.setOnItemLongClickListener(this);
requery();
}
private void addData(String name ,String phone,String email){
ContentValues cv=new ContentValues(3);
cv.put(FROM[0],name);
cv.put(FROM[1],phone);
cv.put(FROM[2],email);
db.insert(TB_NAME,null,cv);
}
private void update(String name ,String phone,String email,int id){
ContentValues cv=new ContentValues(3);
cv.put(FROM[0],name);
cv.put(FROM[1],phone);
cv.put(FROM[2],email);
db.update(TB_NAME,cv,"_id="+id,null);
}
private void requery(){
cur=db.rawQuery("SELECT * FROM "+TB_NAME,null);
adapter.changeCursor(cur);
if(cur.getCount()==MAX)
btInsert.setEnabled(false);
else
btInsert.setEnabled(true);
btUpdate.setEnabled(false);
btDelete.setEnabled(false);
}
public boolean onItemLongClick(AdapterView<?> parent,View view,int position, long id){
onItemClick(parent,view,position,id);
call(view);
return true;
}
public void onItemClick(AdapterView<?> parent, View v,int position,long id){
cur.moveToPosition(position);
etName.setText(cur.getString(
cur.getColumnIndex(FROM[0])
));
etPhone.setText(cur.getString(
cur.getColumnIndex(FROM[1])
));
etEmail.setText(cur.getString(
cur.getColumnIndex(FROM[2])
));
btUpdate.setEnabled(true);
btDelete.setEnabled(true);
}
public void onInsertUpdate(View v){
String nameStr=etName.getText().toString().trim();
String phoneStr=etPhone.getText().toString().trim();
String emailStr=etEmail.getText().toString().trim();
if(nameStr.length()==0 || phoneStr.length()==0 || emailStr.length()==0){
return;
}
if(v.getId()==R.id.btUpdate)
update(nameStr,phoneStr,emailStr,cur.getInt(0));
else
addData(nameStr,phoneStr,emailStr);
requery();
}
public void onDelete(View v){
db.delete(TB_NAME,"_id="+cur.getInt(0),null);
requery();
}
public void call(View v){
String uri="tel:" +cur.getString(cur.getColumnIndex(FROM[1]));
Intent it=new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
startActivity(it);
}
public void mail(View v){
String uri="mailto:"+cur.getString(cur.getColumnIndex(FROM[2]));
Intent it=new Intent(Intent.ACTION_SENDTO,Uri.parse(uri));
startActivity(it);
}
}
<?xml version="1.0" encoding="utf-8"?>
<!--<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"-->
<!--android:orientation="horizontal"-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="match_parent">-->
<!--<TextView-->
<!--android:id="@+id/name"-->
<!--android:layout_marginRight="5dp"-->
<!--android:textSize="30sp"-->
<!--android:textColor="#07a"-->
<!--android:layout_width="match_parent"-->
<!--android:layout_height="wrap_content" />-->
<!--<LinearLayout-->
<!--android:orientation="vertical"-->
<!--android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content">-->
<!--<TextView-->
<!--android:id="@+id/phone"-->
<!--android:textSize="14sp"-->
<!--android:textColor="#840"-->
<!--android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content" />-->
<!--<TextView-->
<!--android:id="@+id/email"-->
<!--android:textSize="14sp"-->
<!--android:textColor="#480"-->
<!--android:layout_width="wrap_content"-->
<!--android:layout_height="wrap_content" />-->
<!--</LinearLayout>-->
<!--</LinearLayout>-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
android:orientation="horizontal">
<TextView
android:id="@+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="5dp"
android:text="TextView"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#07a"
android:textSize="30sp"
android:fontFamily="sans-serif" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/phone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#840"
android:textSize="14sp" />
<TextView
android:id="@+id/email"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"
android:textAppearance="?android:attr/textAppearanceSmall"
android:textColor="#480"
android:textSize="14sp" />
</LinearLayout>
</LinearLayout>