最近有个需求，要求启动页的拦截页每天只能显示3次，超过三次就显示别的页面，然后到第二天才可以再次显示，利用SharePreferences保存天数和每天的次数，大概是思路是：判断 如果是同一天，就去拿保存的次数，当次数小于3才执弹出拦截页，然后，每次弹出，次数就加1,并且保存次数和当天的时间；如果不是同一天，就把次数赋值为1，并且把当天赋值给最后访问的时间，然后保存当前的次数。具体实现如下：

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执行拦截页操作； //修改SharePreferences日期为当前日期，并记录次数一次； frequency = 1; Log.i(TAG, "onClick-----: "+"不是同一天执行次数"+frequency); //把today赋值给lastDay 让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执行拦截页操作； Log.i(TAG, "onClick-----: "+"同一天执行次数"+frequency); frequency++; SharePreferencesUtils.putIntValue(TwoActivity.this,"time_and_frequency","lastDay",lastDay); SharePreferencesUtils.putIntValue(TwoActivity.this,"time_and_frequency","frequency",frequency); }else { //TODO执行别的操作 Log.i(TAG, "onClick-----: "+"超过三次"); } } } }); }}

SharePreferencesUtils代码如下：

/*
* 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; }}

总结

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