最近有個需求，要求啟動頁的攔截頁每天只能顯示3次，超過三次就顯示別的頁面，然後到第二天才可以再次顯示，利用SharePreferences儲存天數和每天的次數，大概是思路是：判斷 如果是同一天，就去拿儲存的次數，當次數小於3才執彈出攔截頁，然後，每次彈出，次數就加1,並且儲存次數和當天的時間；如果不是同一天，就把次數賦值為1，並且把當天賦值給最後訪問的時間，然後儲存當前的次數。具體實現如下：

package com.example.demo1.test;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
 
import com.example.demo1.R;
 
import java.util.Calendar;
 
public class TwoActivity extends AppCompatActivity {
 private static final String TAG = "TwoActivity";
 
 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_two);
 findViewById(R.id.test).setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {
 
  int frequency = SharePreferencesUtils.getIntValue(TwoActivity.this,"time_and_frequency","frequency");
  int today = Calendar.getInstance().get(Calendar.DAY_OF_YEAR);
  int lastDay = SharePreferencesUtils.getIntValue(TwoActivity.this,"lastDay");
  Log.i(TAG,"onClick-----: "+"today:"+today);
  Log.i(TAG,"onClick-----: "+"lastDay:"+lastDay);
  Log.i(TAG,"onClick-----: "+"frequency:"+frequency);
  if(today != lastDay)
  {
   //TODO執行攔截頁操作；
 
   //修改SharePreferences日期為當前日期，並記錄次數一次；
   frequency = 1;
   Log.i(TAG,"onClick-----: "+"不是同一天執行次數"+frequency);
   //把today賦值給lastDay 讓today == lastDay
   SharePreferencesUtils.putIntValue(TwoActivity.this,"lastDay",today);
   SharePreferencesUtils.putIntValue(TwoActivity.this,"frequency",frequency);
  }else if(today == lastDay){
   if(frequency < 3) {
   //TODO執行攔截頁操作；
   Log.i(TAG,"onClick-----: "+"同一天執行次數"+frequency);
   frequency++;
   SharePreferencesUtils.putIntValue(TwoActivity.this,lastDay);
    SharePreferencesUtils.putIntValue(TwoActivity.this,frequency);
   }else {
   //TODO執行別的操作
   Log.i(TAG,"onClick-----: "+"超過三次");
   }
  }
  }
 });
 }
}

SharePreferencesUtils程式碼如下：

/*
* Copyright (c) 2017- WaitFun Inc. All Rights Reserved.
*/

package com.example.demo1.test;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import java.util.Map;
public class SharePreferencesUtils {
 private final static String TAG = SharePreferencesUtils.class.getName();
 private final static SharedPreferences getSharePreferences(Context context,String fileName) {
 return context.getSharedPreferences(fileName,Activity.MODE_PRIVATE);
 }
 public static String getStrValue(Context context,String fileName,String key) {
 return getSharePreferences(context,fileName).getString(key,"");
 }
 public static int getIntValue(Context context,fileName).getInt(key,0);
 }
 public static boolean getBooleanValue(Context context,fileName).getBoolean(key,false);
 }
 public static void putBooleanValue(Context context,String key,boolean value) {
 Editor editor = getSharePreferences(context,fileName).edit();
 editor.putBoolean(key,value);
 editor.commit();
 editor.clear();
 editor = null;
 }
 public static void putStringValue(Context context,String value) {
 Editor editor = getSharePreferences(context,fileName).edit();
 editor.putString(key,value);
 editor.commit();
 editor.clear();
 editor = null;
 }
 public static void putIntValue(Context context,int value) {
 Editor editor = getSharePreferences(context,fileName).edit();
 editor.putInt(key,value);
 editor.commit();
 editor.clear();
 editor = null;
 }
 public static void putMapStringValue(Context context,Map<String,String> editorValue) {
 Editor editor = getSharePreferences(context,fileName).edit();
 for (Map.Entry<String,String> entry : editorValue.entrySet()) {
  String key = entry.getKey();
  String value = entry.getValue();
  editor.putString(key,value);
 }
 editor.commit();
 editorValue.clear();
 editorValue = null;
 }
 public static void putMapIntegerValue(Context context,Integer> editorValue) {
 Editor editor = getSharePreferences(context,Integer> entry : editorValue.entrySet()) {
  String key = entry.getKey();
  Integer value = entry.getValue();
  editor.putInt(key,value);
 }
 editor.commit();
 editorValue.clear();
 editorValue = null;
 }
}

總結

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