Android高手进阶教程(二十三)之---Android中的日历读写操作!!!

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大家好,好久没有更新blog了，今天给大家分享一下Android中一些自带日历的操作方法,这里主要用到了ContentProiver的知识.如果大家不明白ContentProvider建议先查一下资料，知道它是干什么的。这样更容易下面的例子.

好了废话不说,这里提个醒，Android中的日历,只有真机才有，模拟上是没有的，所以测试环境一定要真机！！

因为日历是系统自带的，所以我们读写它一定要申请权限,也就是在AndroidManifest.xml加如下两行代码(一个读一个写):

<uses-permission android:name="android.permission.READ_CALENDAR"/> 
<uses-permission android:name="android.permission.WRITE_CALENDAR"/>

Android中日历用了三个URL,分别是日历用户的URL,事件的URL，事件提醒URL,三个URL在Android2.1之前是如下的样子：

calanderURL = "content://calendar/calendars";
calanderEventURL = "content://calendar/events";
calanderRemiderURL= "content://calendar/reminders";

但是在Android2.2版本以后,三个URL有了改变，变成如下的样子:

calanderURL = "content://com.android.calendar/calendars";
calanderEventURL = "content://com.android.calendar/events";
calanderRemiderURL = "content://com.android.calendar/reminders";

还是老样子,为了让大家更好的理解，我写了一个简单的Demo,大家按照我的步骤一步一步的来:

第一步:新建一个Android工程命名为CalendarDemo.

第二步:修改main.xml布局文件,增加了三个按钮,代码如下:

<?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"
    >
   <TextView  
	android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
	android:text="@string/hello"
    />
   <Button
    	android:id="@+id/readUserButton"
    	android:layout_width="fill_parent" 
	android:layout_height="wrap_content" 
	android:text="Get a User"
    />   
    <Button
    	android:id="@+id/readEventButton"
    	android:layout_width="fill_parent" 
	android:layout_height="wrap_content" 
	android:text="Get a Event"
    />
     <Button
     	android:id="@+id/writeEventButton"
    	android:layout_width="fill_parent" 
	android:layout_height="wrap_content" 
	android:text="Input a Event"
    />
</LinearLayout>

第三步:修改主核心程序CalendarDemo.java，代码如下:

package com.tutor.calendardemo;

import java.util.Calendar;

import android.app.Activity;
import android.content.ContentValues;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class CalendarDemo extends Activity implements OnClickListener {
	private Button mReadUserButton;
	private Button mReadEventButton;
	private Button mWriteEventButton;
	
	private static String calanderURL = "";
	private static String calanderEventURL = "";
    private static String calanderRemiderURL = "";
    //为了兼容不同版本的日历,2.2以后url发生改变
	static{
		if(Integer.parseInt(Build.VERSION.SDK) >= 8){
			calanderURL = "content://com.android.calendar/calendars";
			calanderEventURL = "content://com.android.calendar/events";
			calanderRemiderURL = "content://com.android.calendar/reminders";

		}else{
			calanderURL = "content://calendar/calendars";
			calanderEventURL = "content://calendar/events";
			calanderRemiderURL = "content://calendar/reminders";		
		}
	}
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        setupViews();
    }
    
    private void setupViews(){
    	mReadUserButton = (Button)findViewById(R.id.readUserButton);
    	mReadEventButton = (Button)findViewById(R.id.readEventButton);
    	mWriteEventButton = (Button)findViewById(R.id.writeEventButton);
    	mReadUserButton.setOnClickListener(this);
    	mReadEventButton.setOnClickListener(this);
    	mWriteEventButton.setOnClickListener(this);
    }
    
	@Override
	public void onClick(View v) {
		if(v == mReadUserButton){
			
			Cursor userCursor = getContentResolver().query(Uri.parse(calanderURL), null, 
					null, null, null);
			if(userCursor.getCount() > 0){
				userCursor.moveToFirst();
				String userName = userCursor.getString(userCursor.getColumnIndex("name"));
				Toast.makeText(CalendarDemo.this, userName, Toast.LENGTH_LONG).show();
			}
		}else if(v == mReadEventButton){
			Cursor eventCursor = getContentResolver().query(Uri.parse(calanderEventURL), null, 
					null, null, null);
			if(eventCursor.getCount() > 0){
				eventCursor.moveToLast();
				String eventTitle = eventCursor.getString(eventCursor.getColumnIndex("title"));
				Toast.makeText(CalendarDemo.this, eventTitle, Toast.LENGTH_LONG).show();
			}
		}else if(v == mWriteEventButton){
			//获取要出入的gmail账户的id
			String calId = "";
			Cursor userCursor = getContentResolver().query(Uri.parse(calanderURL), null, 
					null, null, null);
			if(userCursor.getCount() > 0){
				userCursor.moveToFirst();
				calId = userCursor.getString(userCursor.getColumnIndex("_id"));
				
			}
			ContentValues event = new ContentValues();
	    	event.put("title", "与苍井空小姐动作交流");
	    	event.put("description", "Frankie受空姐邀请,今天晚上10点以后将在Sheraton动作交流.lol~");
	    	//插入hoohbood@gmail.com这个账户
	    	event.put("calendar_id",calId);
	    	
	    	Calendar mCalendar = Calendar.getInstance();
	    	mCalendar.set(Calendar.HOUR_OF_DAY,10);
	    	long start = mCalendar.getTime().getTime();
	    	mCalendar.set(Calendar.HOUR_OF_DAY,11);
	    	long end = mCalendar.getTime().getTime();
	    	
	    	event.put("dtstart", start);
	    	event.put("dtend", end);
	    	event.put("hasAlarm",1);
	    	
	    	Uri newEvent = getContentResolver().insert(Uri.parse(calanderEventURL), event);
	    	long id = Long.parseLong( newEvent.getLastPathSegment() );
	    	ContentValues values = new ContentValues();
	        values.put( "event_id", id );
	        //提前10分钟有提醒
	        values.put( "minutes", 10 );
	        getContentResolver().insert(Uri.parse(calanderRemiderURL), values);
	        Toast.makeText(CalendarDemo.this, "插入事件成功!!!", Toast.LENGTH_LONG).show();
		}
	}
}

第四步:在AndroidManifest.xml中申请权限,代码如下:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.tutor.calendardemo"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".CalendarDemo"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
    <uses-sdk android:minSdkVersion="7" />
	<uses-permission android:name="android.permission.READ_CALENDAR"/> 
    <uses-permission android:name="android.permission.WRITE_CALENDAR"/> 
</manifest>

第五步:运行上述Android工程,查看效果：