8 SQLiteDatabase 存储时需要使用绝对路径

---------------------------------main.java--------------------------------------

package com.example.db;


import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteException;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;


public class MainActivity extends ActionBarActivity {


SQLiteDatabase db;
Button bn = null;
ListView listView;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//创建或打开数据库（此处需要使用绝对路径）
db = SQLiteDatabase.openOrCreateDatabase(this.getFilesDir()
.toString() + "/my.db3" , null);
listView = (ListView)findViewById(R.id.show);
bn = (Button)findViewById(R.id.ok);
bn.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View source)
{
//获取用户输入
String title = ((EditText)findViewById(R.id.title))
.getText().toString();
String content = ((EditText)findViewById(R.id.content))
.getText().toString();
try 
{
insertData(db , title , content);
Cursor cursor = db.rawQuery("select * from news_inf", null);
inflateList(cursor);
}
catch(SQLiteException  se)
{
//执行DDL创建数据表
db.execSQL("create table news_inf(_id integer primary key autoincrement,"
+ " news_title varchar(50),"
+ " news_content varchar(255))");
//执行insert语句插入数据
insertData(db , title , content);
//执行查询
Cursor cursor = db.rawQuery("select * from news_inf", null);
inflateList(cursor);
}
}
});
}
private void insertData(SQLiteDatabase db
, String title , String content)
{
//执行插入语句
db.execSQL("insert into news_inf values(null , ? , ?)"
, new String[]{title , content});
}
private void inflateList(Cursor cursor)
{
//填充SimpleCursorAdapter
SimpleCursorAdapter adapter = new SimpleCursorAdapter(
MainActivity.this , R.layout.line, cursor 
, new String[]{"news_title" , "news_content"}
, new int[]{R.id.my_title , R.id.my_content});
//显示数据
listView.setAdapter(adapter);
}
@Override
public void onDestroy()
{
super.onDestroy();
//退出程序时关闭SQLiteDatabase
if (db != null && db.isOpen())
{
db.close();
}
}


}

。。。。。。。。。。。。。。。main.xml。。。。。。。。。。。。。。。。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>

<EditText 
android:id="@+id/title"
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
/>
<EditText  
android:id="@+id/content"
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:lines="2"
/>
<Button  
android:id="@+id/ok"
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:text="@string/insert"
/>
<ListView  
android:id="@+id/show"
android:layout_width="fill_parent" 
android:layout_height="fill_parent" 
/>
</LinearLayout>

。。。。。。。。。。。。。。。。line.xml。。。。。。。。。。。。。。。。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<EditText 
android:id="@+id/my_title"
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:width="120px"
/>
<EditText  
android:id="@+id/my_content"
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
/>
</LinearLayout>