最近写了个闹钟的程序，看到SharedPreferences在一个程序中可以共享数据，SharedPreferences是一个轻量级的键值存储机制，只可以存储基本数据类型。我就拿来用用，没想到SharedPreferences太好了，真是轻量级的保存数据的好的工具，比sqlite好用多了！以后我又多了一种编程思想了，呵呵，所以现在分享给大家，特别注意这点：这个无法直接在多个程序间共享Preferences数据。程序关闭再打开时间仍然保留你上次设置的时间。这就是Preferences的作用！

程序欢迎界面：

点击设置闹钟界面：

点击闹钟设置中的设置后的界面：

闹钟时间到了弹出dialog：

设置重复想起闹钟后的界面：

点击返回键弹出的提示：

下面请看代码：

一、MainActivity中的代码：

package com.cn.daming; import java.util.Calendar; import android.app.Activity;import android.app.AlarmManager;import android.app.AlertDialog;import android.app.PendingIntent;import android.app.TimePickerDialog;import android.content.DialogInterface;import android.content.Intent;import android.content.SharedPreferences;import android.os.Bundle;import android.view.KeyEvent;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.widget.Button;import android.widget.EditText;import android.widget.TextView;import android.widget.TimePicker;import android.widget.Toast; public class MainActivity extends Activity { TextView setTime1; TextView setTime2; TextView setTime3; Button mButton1; Button mButton2; Button mButton3; Button mButton4; Button mButton5; Button mButton6; String time1String = null; String time2String = null; String time3String = null; String defalutString = "目前无设置"; AlertDialog builder = null; Calendar c=Calendar.getInstance(); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); //取得活动的Preferences对象 SharedPreferences settings = getPreferences(Activity.MODE_PRIVATE); time1String = settings.getString("TIME1", defalutString); time2String = settings.getString("TIME2", defalutString); time3String = settings.getString("TIME3", defalutString); InitButton1(); InitButton2(); InitButton3(); InitButton4(); InitButton5(); InitButton6(); setTime1.setText(time1String); setTime3.setText(time2String); setTime2.setText(time3String); } public void InitButton1() { setTime1=(TextView) findViewById(R.id.setTime1); mButton1=(Button)findViewById(R.id.mButton1); mButton1.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { c.setTimeInMillis(System.currentTimeMillis()); int mHour=c.get(Calendar.HOUR_OF_DAY); int mMinute=c.get(Calendar.MINUTE); new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() { public void onTimeSet(TimePicker view,int hourOfDay, int minute) { c.setTimeInMillis(System.currentTimeMillis()); c.set(Calendar.HOUR_OF_DAY,hourOfDay); c.set(Calendar.MINUTE,minute); c.set(Calendar.SECOND,0); c.set(Calendar.MILLISECOND,0); Intent intent = new Intent(MainActivity.this, CallAlarm.class); PendingIntent sender=PendingIntent.getBroadcast( MainActivity.this,0, intent, 0); AlarmManager am; am = (AlarmManager)getSystemService(ALARM_SERVICE); am.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), sender ); String tmpS=format(hourOfDay)+"："+format(minute); setTime1.setText(tmpS); //SharedPreferences保存数据，并提交 SharedPreferences time1Share = getPreferences(0); SharedPreferences.Editor editor = time1Share.edit(); editor.putString("TIME1", tmpS); editor.commit(); Toast.makeText(MainActivity.this,"设置大明闹钟时间为"+tmpS, Toast.LENGTH_SHORT) .show(); } },mHour,mMinute,true).show(); } }); } public void InitButton2() { mButton2=(Button) findViewById(R.id.mButton2); mButton2.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Intent intent = new Intent(MainActivity.this, CallAlarm.class); PendingIntent sender=PendingIntent.getBroadcast( MainActivity.this,0, intent, 0); AlarmManager am; am =(AlarmManager)getSystemService(ALARM_SERVICE); am.cancel(sender); Toast.makeText(MainActivity.this,"大明闹钟时间删除", Toast.LENGTH_SHORT).show(); setTime1.setText("目前无设置"); SharedPreferences time1Share = getPreferences(0); SharedPreferences.Editor editor = time1Share.edit(); editor.putString("TIME1", "目前无设置"); editor.commit(); } }); } public void InitButton3() { setTime3=(TextView) findViewById(R.id.setTime5); mButton3=(Button)findViewById(R.id.mButton5); mButton3.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { c.setTimeInMillis(System.currentTimeMillis()); int mHour=c.get(Calendar.HOUR_OF_DAY); int mMinute=c.get(Calendar.MINUTE); new TimePickerDialog(MainActivity.this, new TimePickerDialog.OnTimeSetListener() { public void onTimeSet(TimePicker view,int hourOfDay, int minute) { c.setTimeInMillis(System.currentTimeMillis()); c.set(Calendar.HOUR_OF_DAY,hourOfDay); c.set(Calendar.MINUTE,minute); c.set(Calendar.SECOND,0); c.set(Calendar.MILLISECOND,0); Intent intent = new Intent(MainActivity.this, CallAlarm.class); PendingIntent sender=PendingIntent.getBroadcast( MainActivity.this,1, intent, 0); AlarmManager am; am = (AlarmManager)getSystemService(ALARM_SERVICE); am.set(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(), sender ); String tmpS=format(hourOfDay)+"："+format(minute); setTime3.setText(tmpS); //SharedPreferences保存数据，并提交 SharedPreferences time2Share = getPreferences(1); SharedPreferences.Editor editor = time2Share.edit(); editor.putString("TIME2", tmpS); editor.commit(); Toast.makeText(MainActivity.this,"设置大明闹钟时间为"+tmpS, Toast.LENGTH_SHORT) .show(); } },mHour,mMinute,true).show(); } }); } public void InitButton4() { mButton4=(Button) findViewById(R.id.mButton6); mButton4.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Intent intent = new Intent(MainActivity.this, CallAlarm.class); PendingIntent sender=PendingIntent.getBroadcast( MainActivity.this,0, intent, 0); AlarmManager am; am =(AlarmManager)getSystemService(ALARM_SERVICE); am.cancel(sender); Toast.makeText(MainActivity.this,"大明闹钟时间删除", Toast.LENGTH_SHORT).show(); setTime3.setText("目前无设置"); //SharedPreferences保存数据，并提交 SharedPreferences time2Share = getPreferences(1); SharedPreferences.Editor editor = time2Share.edit(); editor.putString("TIME2", "目前无设置"); editor.commit(); } }); } public void InitButton5() { setTime2=(TextView) findViewById(R.id.setTime2); LayoutInflater factory = LayoutInflater.from(this); final View setView = factory.inflate(R.layout.timeset,null); final TimePicker tPicker=(TimePicker)setView .findViewById(R.id.tPicker); tPicker.setIs24HourView(true); final AlertDialog di=new AlertDialog.Builder(MainActivity.this) .setIcon(R.drawable.clock) .setTitle("设置") .setView(setView) .setPositiveButton("确定", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { EditText ed=(EditText)setView.findViewById(R.id.mEdit); int times=Integer.parseInt(ed.getText().toString()) *1000; c.setTimeInMillis(System.currentTimeMillis()); c.set(Calendar.HOUR_OF_DAY,tPicker.getCurrentHour()); c.set(Calendar.MINUTE,tPicker.getCurrentMinute()); c.set(Calendar.SECOND,0); c.set(Calendar.MILLISECOND,0); Intent intent = new Intent(MainActivity.this, CallAlarm.class); PendingIntent sender = PendingIntent.getBroadcast( MainActivity.this,1, intent, 0); AlarmManager am; am = (AlarmManager)getSystemService(ALARM_SERVICE); am.setRepeating(AlarmManager.RTC_WAKEUP, c.getTimeInMillis(),times,sender); String tmpS=format(tPicker.getCurrentHour())+"："+ format(tPicker.getCurrentMinute()); String subStr = "设置大明闹钟时间为"+tmpS+ "开始，重复间隔为"+times/1000+"秒"; setTime2.setText("设置大明闹钟时间为"+tmpS+ "开始，重复间隔为"+times/1000+"秒"); //SharedPreferences保存数据，并提交 SharedPreferences time3Share = getPreferences(2); SharedPreferences.Editor editor = time3Share.edit(); editor.putString("TIME3", subStr); editor.commit(); Toast.makeText(MainActivity.this,"设置大明闹钟为"+tmpS+ "开始，重复间隔为"+times/1000+"秒", Toast.LENGTH_SHORT).show(); } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { } }).create(); mButton5=(Button) findViewById(R.id.mButton3); mButton5.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { c.setTimeInMillis(System.currentTimeMillis()); tPicker.setCurrentHour(c.get(Calendar.HOUR_OF_DAY)); tPicker.setCurrentMinute(c.get(Calendar.MINUTE)); di.show(); } }); } public void InitButton6() { mButton6=(Button) findViewById(R.id.mButton4); mButton6.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { Intent intent = new Intent(MainActivity.this, CallAlarm.class); PendingIntent sender = PendingIntent.getBroadcast( MainActivity.this,1, intent, 0); AlarmManager am; am = (AlarmManager)getSystemService(ALARM_SERVICE); am.cancel(sender); Toast.makeText(MainActivity.this,"闹钟时间删除", Toast.LENGTH_SHORT).show(); setTime2.setText("目前无设置"); //SharedPreferences保存数据，并提交 SharedPreferences time3Share = getPreferences(2); SharedPreferences.Editor editor = time3Share.edit(); editor.putString("TIME3", "目前无设置"); editor.commit(); } }); } @Override public boolean onKeyUp(int keyCode, KeyEvent event) { if(keyCode == KeyEvent.KEYCODE_BACK){ builder = new AlertDialog.Builder(MainActivity.this) .setIcon(R.drawable.clock) .setTitle("温馨提示：") .setMessage("您是否要退出大明闹钟程序!!!") .setPositiveButton("确定", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { MainActivity.this.finish(); } }) .setNegativeButton("取消", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { builder.dismiss(); } }).show(); } return true; } private String format(int x) { String s=""+x; if(s.length()==1) s="0"+s; return s; }}

二、CallAlarm中的代码：

package com.cn.daming; import android.content.Context;import android.content.Intent;import android.content.BroadcastReceiver;import android.os.Bundle; public class CallAlarm extends BroadcastReceiver{ @Override public void onReceive(Context context, Intent intent) { Intent i = new Intent(context, AlarmAlert.class); Bundle bundleRet = new Bundle(); bundleRet.putString("STR_CALLER", ""); i.putExtras(bundleRet); i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); context.startActivity(i); }}

三、AlarmAlert中的代码：

package com.cn.daming; import android.app.Activity;import android.app.AlertDialog;import android.content.DialogInterface;import android.os.Bundle; public class AlarmAlert extends Activity{ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); new AlertDialog.Builder(AlarmAlert.this) .setIcon(R.drawable.clock) .setTitle("大明闹钟响了!!") .setMessage("快完成你制定的计划吧!!!") .setPositiveButton("关掉它", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { AlarmAlert.this.finish(); } }) .show(); } }

四、main.xml布局文件的代码：

<?xml version="1.0" encoding="utf-8"?><AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/layout1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/other"> <DigitalClock android:id="@+id/dClock" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textSize="40sp" android:textColor="@drawable/blue" android:layout_x="70px" android:layout_y="32px" > </DigitalClock> <TextView android:id="@+id/text1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/str_title3" android:textSize="20sp" android:textColor="@drawable/black" android:layout_x="10px" android:layout_y="104px" > </TextView> <Button android:id="@+id/mButton1" android:layout_width="wrap_content" android:layout_height="40px" android:text="@string/str_button1" android:textColor="@drawable/black" android:textSize="18sp" android:layout_x="190px" android:layout_y="102px" > </Button> <TextView android:id="@+id/setTime1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/str_default" android:textColor="@drawable/red" android:textSize="16sp" android:layout_x="10px" android:layout_y="149px" > </TextView> <Button android:id="@+id/mButton2" android:layout_width="wrap_content" android:layout_height="40px" android:text="@string/str_button2" android:textColor="@drawable/black" android:textSize="18sp" android:layout_x="190px" android:layout_y="142px" > </Button> <TextView android:id="@+id/text5" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/str_title4" android:textSize="20sp" android:textColor="@drawable/black" android:layout_x="10px" android:layout_y="216px" > </TextView> <Button android:id="@+id/mButton5" android:layout_width="wrap_content" android:layout_height="40px" android:text="@string/str_button1" android:textColor="@drawable/black" android:textSize="18sp" android:layout_x="190px" android:layout_y="212px" > </Button> <TextView android:id="@+id/setTime5" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/str_default" android:textColor="@drawable/red" android:textSize="16sp" android:layout_x="10px" android:layout_y="259px" > </TextView> <Button android:id="@+id/mButton6" android:layout_width="wrap_content" android:layout_height="40px" android:text="@string/str_button2" android:textColor="@drawable/black" android:textSize="18sp" android:layout_x="190px" android:layout_y="252px" > </Button> <TextView android:id="@+id/text2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/str_title2" android:textSize="20sp" android:textColor="@drawable/black" android:layout_x="10px" android:layout_y="326px" > </TextView> <Button android:id="@+id/mButton3" android:layout_width="wrap_content" android:layout_height="40px" android:text="@string/str_button1" android:textColor="@drawable/black" android:textSize="18sp" android:layout_x="190px" android:layout_y="322px" > </Button> <TextView android:id="@+id/setTime2" android:layout_width="170px" android:layout_height="wrap_content" android:text="@string/str_default" android:textColor="@drawable/red" android:textSize="16sp" android:layout_x="10px" android:layout_y="369px" > </TextView> <Button android:id="@+id/mButton4" android:layout_width="wrap_content" android:layout_height="40px" android:text="@string/str_button2" android:textColor="@drawable/black" android:textSize="18sp" android:layout_x="190px" android:layout_y="362px" > </Button> </AbsoluteLayout>

五、timeset.xml布局文件中的代码：

<?xml version="1.0" encoding="utf-8"?><AbsoluteLayout android:id="@+id/layout2" android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android"> <TextView android:id="@+id/text1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/str_text1" android:textColor="@drawable/white" android:textSize="16sp" android:layout_x="10px" android:layout_y="32px" > </TextView> <TextView android:id="@+id/text2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/str_text2" android:textColor="@drawable/white" android:textSize="16sp" android:layout_x="10px" android:layout_y="172px" > </TextView> <TimePicker android:id="@+id/tPicker" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_x="100px" android:layout_y="12px" > </TimePicker> <EditText android:id="@+id/mEdit" android:layout_width="52px" android:layout_height="40px" android:text="15" android:textSize="16sp" android:layout_x="120px" android:layout_y="162px" > </EditText> <TextView android:id="@+id/text3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/str_text3" android:textColor="@drawable/white" android:textSize="16sp" android:layout_x="180px" android:layout_y="172px" > </TextView></AbsoluteLayout>

六、string.xml中的代码：

<?xml version="1.0" encoding="utf-8"?><resources> <string name="hello">Hello World, EX06_10</string> <string name="app_name">大明原创闹钟</string> <string name="str_button1">设置闹钟</string> <string name="str_button2">删除闹钟</string> <string name="str_title2">重复响起的闹钟</string> <string name="str_title3">大明闹钟一</string> <string name="str_title4">大明闹钟二</string> <string name="str_default">目前无设置</string> <string name="str_text1">开始时间</string> <string name="str_text2">重复响起的闹钟</string> <string name="str_text3">秒</string></resources>

七、color.xml中的代码：

<?xml version="1.0" encoding="utf-8"?><resources> <drawable name="white">#FFFFFFFF</drawable> <drawable name="other">#FF00FFF0</drawable> <drawable name="black">#000000</drawable> <drawable name="blue">#0000FF</drawable> <drawable name="red">#FF0000</drawable></resources>

八、AndroidManifest.xml中的代码

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.cn.daming" android:versionCode="1" android:versionName="1.0"> <uses-sdk android:minSdkVersion="8" /> <application android:icon="@drawable/icon" android:label="@string/app_name"> <!-- 註冊receiver CallAlarm --> <receiver android:name=".CallAlarm" android:process=":remote" /> <activity android:name=".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> <activity android:name=".AlarmAlert" android:label="@string/app_name"> </activity> </application></manifest>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。