一个小控件，可写签名，适合喜欢美观的童鞋

喜欢的童鞋点击下载安装：http://www.apkbus.com/android-95651-1-1.html

可以添加签名：

主程序：

package com.bn.ex12j;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast; 

public class Sample12_10_Activity extends Activity 
{
    EditText et;
    
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        //初始化指向输入心情的文本区的引用
        et=(EditText)this.findViewById(R.id.EditText01);
        //获取确定按钮
        Button b=(Button)this.findViewById(R.id.Button01);
        //给确定按钮添加监听器
        b.setOnClickListener
        (
            new OnClickListener() 
            {
                @Override
                public void onClick(View v) 
                {
                    //获取文本框中输入的心情
                    String msg=et.getText().toString();
                    if(msg.trim().length()==0)
                    {//若输入的心情为空则提示并返回
                        Toast.makeText
                        (
                                Sample12_10_Activity.this, 
                                "心情不能为空！！！", 
                                Toast.LENGTH_SHORT
                        ).show();
                        return;
                    }
                    else if(msg.length()>12)
                    {//若输入的心情超过长度则提示并返回
                        Toast.makeText
                        (
                                Sample12_10_Activity.this, 
                                "心情不能大于12个字！！！", 
                                Toast.LENGTH_SHORT
                        ).show();
                        return;
                    }
                    
                    //若输入合法则发送Intent修改widget中的内容
                    Intent intent = new Intent("wyf.action.update_xq");
                    intent.putExtra("xxq", msg);
                    Sample12_10_Activity.this.sendBroadcast(intent);    
                    //发送完Intent结束Activity
                    Sample12_10_Activity.this.finish();
                }                
            }
        );
    }
}

另外java包两个：

package com.bn.ex12j;

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.util.Log;
import android.widget.RemoteViews;

//特别注意此类对象每次收到消息后系统会造一个新对象，因此此类对象不可用与存储状态
public class MyWidgetProvider  extends AppWidgetProvider
{
    RemoteViews rv; 

    public MyWidgetProvider()
    {
        Log.d("MyWidgetProvider","============");    
    }
    
    @Override  
    public void onDisabled(Context context) 
    {//若为最后一个实例
        //删除时停止后台定时更新Widget时间的Service
        context.stopService(new Intent(context,TimeService.class));
    }
    
    @Override  
    public void onEnabled (Context context) 
    {//若为第一个实例则打开服务
        //启动后台定时更新时间的Service
        context.startService(new Intent(context,TimeService.class));             
    }
    
    //onUpdate为组件在桌面上生成时调用,并更新组件UI
    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager,int[] appWidgetIds) 
    {
        //创建RemoteViews
        rv = new RemoteViews(context.getPackageName(), R.layout.wmain);    
        //创建启动修改心情的Activity的Intent
        Intent intent = new Intent(context,Sample12_10_Activity.class);
        //创建包裹此Intent的PendingIntent
        PendingIntent pendingIntent=PendingIntent.getActivity
        (
                context, 
                0, 
                intent, 
                PendingIntent.FLAG_UPDATE_CURRENT
        );
        //设置按下Widget中文本框发送此PendingIntent
        rv.setOnClickPendingIntent(R.id.TextView01, pendingIntent);          
        
        //获取SharedPreferences
        SharedPreferences sp=context.getSharedPreferences("xqsj", Context.MODE_PRIVATE);
        //从SharedPreferences中读取上次的心情
        String xqStr=sp.getString
        (
                "xq",   //键值
                null    //默认值
        );
        if(xqStr!=null)
        {//若上次心情存在则更新心情
            rv.setTextViewText(R.id.TextView01, xqStr);
        }
        
        //更新Widget
        appWidgetManager.updateAppWidget(appWidgetIds, rv);
    }
    
    @Override  //onReceiver 为接收广播时调用更新UI
    public void onReceive(Context context, Intent intent) 
    {
        super.onReceive(context, intent);
        if (rv == null) 
        {
            //创建RemoteViews
            rv = new RemoteViews(context.getPackageName(), R.layout.wmain);
        }
        if (intent.getAction().equals("wyf.action.update_xq")) 
        {//收到的是更新心情的 Action则更新心情
            //更新心情
            rv.setTextViewText(R.id.TextView01, intent.getStringExtra("xxq"));            
            //向Preferences中写入心情
            SharedPreferences sp=context.getSharedPreferences("xqsj", Context.MODE_PRIVATE);
            SharedPreferences.Editor editor=sp.edit();
            editor.putString("xq",intent.getStringExtra("xxq"));
            editor.commit();
        }
        else  if (intent.getAction().equals("wyf.action.time_upadte")) 
        {//收到的是更新时间的 Action则更新时间
            rv.setTextViewText(R.id.TextView02,intent.getStringExtra("time"));
        }     
        else  if (intent.getAction().equals("wyf.action.load_xq")) 
        {//收到的更新心情并添加监听则更新心情并添加监听==为切屏（横竖屏切换）服务
            //创建启动修改心情的Activity的Intent
            Intent intentTemp = new Intent(context,Sample12_10_Activity.class);
            //创建包裹此Intent的PendingIntent
            PendingIntent pendingIntent=PendingIntent.getActivity
            (
                    context, 
                    0, 
                    intentTemp,
                    PendingIntent.FLAG_UPDATE_CURRENT
            );
            //设置按下Widget中文本框发送此PendingIntent
            rv.setOnClickPendingIntent(R.id.TextView01, pendingIntent);  
            
            //获取SharedPreferences
            SharedPreferences sp=context.getSharedPreferences("xqsj", Context.MODE_PRIVATE);
            //从SharedPreferences中读取上次的心情
            String xqStr=sp.getString
            (
                    "xq",   //键值
                    null    //默认值
            );
            if(xqStr!=null)
            {//若上次心情存在则更新心情
                rv.setTextViewText(R.id.TextView01, xqStr);
            }
        }    

        //真正更新Widget
        AppWidgetManager appWidgetManger = AppWidgetManager.getInstance(context);
        int[] appIds = appWidgetManger.getAppWidgetIds
        (
            new ComponentName
            (
                context, 
                MyWidgetProvider.class
            )
        );
        appWidgetManger.updateAppWidget(appIds, rv);
    }
}

package com.bn.ex12j;

import java.util.Date;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class TimeService extends Service 
{
    boolean flag=true;//线程循环标志
    Thread task;//定时刷新时间的任务线程
    
    @Override
    public IBinder onBind(Intent arg0) 
    {
        //因为本例用不到Bind功能，因此直接返回null
        return null;
    }
   
    @Override
    public void onCreate()
    {
        super.onCreate();
        //创建定时更新时间的任务线程
        task=new Thread()
        {
            public void run()
            {
                while(flag)
                {
                    //定时发送Intent更新时间
                    Intent intent = new Intent("wyf.action.time_upadte");
                    Date d=new Date();
                    StringBuilder sb=new StringBuilder();
                    sb.append(d.getYear()+1900);
                    sb.append("年");
                    sb.append((d.getMonth()+1<10)?"0":"");
                    sb.append(d.getMonth()+1);
                    sb.append("月");
                    sb.append((d.getDate()<10)?"0":"");
                    sb.append(d.getDate());
                    sb.append("日  ");
                    sb.append((d.getHours()<10)?"0":"");
                    sb.append(d.getHours());
                    sb.append(":");
                    sb.append((d.getMinutes()<10)?"0":"");
                    sb.append(d.getMinutes());
                    sb.append(":");
                    sb.append((d.getSeconds()<10)?"0":"");
                    sb.append(d.getSeconds());
                    
                    intent.putExtra("time", sb.toString());
                    TimeService.this.sendBroadcast(intent);    
                    
                    //定时发送Intent更新心情内容，并给心情文本View添加监听器
                    //防止切屏后widget不工作了
                    intent = new Intent("wyf.action.load_xq");
                    TimeService.this.sendBroadcast(intent);    
                    
                    try 
                    {
                        Thread.sleep(500);
                    } catch (InterruptedException e) 
                    {
                        e.printStackTrace();
                    }
                }
            }
        };
    }
    
    @Override
    public void onStart(Intent intent, int id)
    {        
        //启动任务线程
        task.start();
    }
    
    @Override
    public void onDestroy()
    {
        //关闭定时更新时间的任务线程
        flag=false;
    }
}

main。xml文件：

<?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:text="今日心情"
    android:id="@+id/TextView01" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content"
    android:textColor="#FFFFFF"
    android:textSize="20dip"
    android:clickable="true"
  >
  </TextView>
  <EditText 
    android:id="@+id/EditText01" 
    android:singleLine="false"
    android:layout_width="fill_parent" 
    android:layout_height="60dip"
  >
  </EditText>  
  <Button 
    android:text="确定" 
    android:id="@+id/Button01" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content">
  </Button>
</LinearLayout>

wmain.xml文件：

<?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"
    android:background="@drawable/dialog"
    >
  <TextView 
    android:text="请点击输入心情"
    android:id="@+id/TextView01" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    android:textColor="#FFFFFF"
    android:textSize="24dip"
    android:clickable="true"
  >
  </TextView>
  <TextView
    android:id="@+id/TextView02" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"
    android:textColor="#FFFFFF"
    android:textSize="24dip"    
  >
  </TextView>
</LinearLayout>

mainfest文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.bn.ex12j"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".Sample12_10_Activity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    <receiver 
          android:name=".MyWidgetProvider"
          android:label="时间心情"
          android:icon="@drawable/heart"
        >
            <meta-data android:name="android.appwidget.provider"
                android:resource="@xml/appwidgetprovder"></meta-data>
            <intent-filter>
                <action android:name="wyf.action.time_upadte"></action>
                <action android:name="wyf.action.update_xq"></action>                
                <action android:name="wyf.action.load_xq"></action>
                <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />                 
            </intent-filter>
        </receiver>
        <service android:name=".TimeService" android:process=":remote"/>
    </application>
    <uses-sdk android:minSdkVersion="7" />

</manifest>