package com.jikexueyuan.contentwriter;

import android.content.ContentProvider;

import android.content.ContentValues;

import android.content.Context;

import android.database.Cursor;

import android.database.sqlite.SQLiteDatabase;

import android.net.Uri;

public class Myprovider extends ContentProvider {

    public static final Uri URI = Uri.parse("content://com.jikexueyuan.cp");

    SQLiteDatabase database;

    @Override

    public int delete(Uri arg0, String arg1, String[] arg2) {

        return 0;

    }

    @Override

    public String getType(Uri arg0) {

        return null;

    }

    @Override

    public Uri insert(Uri arg0, ContentValues arg1) {

        database.insert("tab", "_id", arg1);

//        database.close();

        return null;

    }

    @Override

    public boolean onCreate() {

        database = getContext().openOrCreateDatabase("mycp.db3", Context.MODE_PRIVATE, null);

        database.execSQL("create table tab(_id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL)");

        return true;

    }

    @Override

    public Cursor query(Uri arg0, String[] arg1, String arg2, String[] arg3,

            String arg4) {

        Cursor cursor = database.query("tab", null, null, null, null, null, null);

        return cursor;

    }

    @Override

    public int update(Uri arg0, ContentValues arg1, String arg2, String[] arg3) {

        return 0;

    }

}

public class MainActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        findViewById(R.id.button1).setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View arg0) {

                write();

            }

        });

    }

    public void write() {

        ContentValues values;

        values = new ContentValues();

        values.put("name", "Java");

        getContentResolver().insert(Myprovider.URI, values);

        values = new ContentValues();

        values.put("name", "Swift");

        getContentResolver().insert(Myprovider.URI, values);

        values = new ContentValues();

        values.put("name", "Python");

        getContentResolver().insert(Myprovider.URI, values);

        values = new ContentValues();

        values.put("name", "C#");

        getContentResolver().insert(Myprovider.URI, values);

    }

}

<?xml version="1.0" encoding="utf-8"?>

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

    package="com.jikexueyuan.contentwriter"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="14"

        android:targetSdkVersion="19" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.jikexueyuan.contentwriter.MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <provider android:name="Myprovider" android:exported="true"

            android:authorities="com.jikexueyuan.cp" />

    </application>

</manifest>

public class MainActivity extends Activity {

    Uri URI = Uri.parse("content://com.jikexueyuan.cp");

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Cursor cursor = getContentResolver().query(URI, null, null, null, null);

        cursor.moveToFirst();

        for (int i = 0; i < cursor.getCount(); i++) {

            String value = cursor.getString(cursor.getColumnIndex("name"));

            Toast.makeText(getApplicationContext(), value, Toast.LENGTH_SHORT).show();

            cursor.moveToNext();

        }

    }

}