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，然后到第二天才可以再次顯示，利用SharePreferences保存天數和每天的次數，大概是思路是：判斷 如果是同一天，就去拿保存的次數，當次數小于3才執彈出攔截頁，然后，每次彈出，次數就加1,并且保存次數和當天的時間；如果不是同一天，就把次數賦值為1，并且把當天賦值給最后訪問的時間，然后保存當前的次數。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,'time_and_frequency','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，并記錄次數一次； 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,'time_and_frequency','lastDay',today); SharePreferencesUtils.putIntValue(TwoActivity.this,'time_and_frequency','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,'time_and_frequency','lastDay',lastDay); SharePreferencesUtils.putIntValue(TwoActivity.this,'time_and_frequency','frequency',frequency); }else { //TODO執行別的操作 Log.i(TAG, 'onClick-----: '+'超過三次'); } } } }); }}

SharePreferencesUtils代碼如下：

/* * 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, String fileName, String key) { return getSharePreferences(context, fileName).getInt(key, 0); } public static boolean getBooleanValue(Context context, String fileName, String key) { return getSharePreferences(context, fileName).getBoolean(key, false); } public static void putBooleanValue(Context context, String fileName, 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 fileName, String key, String value) { Editor editor = getSharePreferences(context, fileName).edit(); editor.putString(key, value); editor.commit(); editor.clear(); editor = null; } public static void putIntValue(Context context, String fileName, String key, int value) { Editor editor = getSharePreferences(context, fileName).edit(); editor.putInt(key, value); editor.commit(); editor.clear(); editor = null; } public static void putMapStringValue(Context context, String fileName, 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, String fileName, Map<String, Integer> editorValue) { Editor editor = getSharePreferences(context, fileName).edit(); for (Map.Entry<String, 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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