編輯:Android開發實例
Android對這種方法進行了封裝,我們沒有權限去調用這個方法,所以我們只能通過AIDL,然後利用Java的反射機制去調用系統級的方法。
下面上代碼:(注釋比較詳細)
/** * 作用:-----獲取包的大小----- * @param context 上下文 * @param pkgName app的包名 * @param appInfo 實體類,用於存放App的某些信息 */ public static void getPkgSize(final Context context, String pkgName, final PhoneAppInfo appInfo) { // getPackageSizeInfo是PackageManager中的一個private方法,所以需要通過反射的機制來調用 Method method; try { method = PackageManager.class.getMethod("getPackageSizeInfo", new Class[]{String.class, IPackageStatsObserver.class}); // 調用 getPackageSizeInfo 方法,需要兩個參數:1、需要檢測的應用包名;2、回調 method.invoke(context.getPackageManager(), pkgName, new IPackageStatsObserver.Stub() { @Override public void onGetStatsCompleted(PackageStats pStats, boolean succeeded) throws RemoteException { if (succeeded && pStats != null) { synchronized (PhoneAppInfo.class) { appInfo.setCatchSize(pStats.cacheSize);//緩存大小 appInfo.setDataSize(pStats.dataSize); //數據大小 appInfo.setCodeSize(pStats.codeSize); //應用大小 appInfo.setAppSize(pStats.cacheSize + pStats.codeSize + pStats.dataSize);//應用的總大小 Log.d("asdasdxx",appInfo.getAppSize()+""); } } } }); } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) { e.printStackTrace(); } }
下面是兩個AIDL文件的代碼。。。
步驟(Android Studio):
1、在main文件夾下,建立一個aidl文件夾的文件夾
2、建立一個包,包名為android.content.pm
3、結構圖
*******PackageStats.aidl文件***************
/* //device/java/android/android/view/WindowManager.aidl ** ** Copyright 2007, The Android Open Source Project ** ** Licensed under the Apache License, Version 2.0 (the "License"); ** you may not use this file except in compliance with the License. ** You may obtain a copy of the License at ** ** http://www.apache.org/licenses/LICENSE-2.0 ** ** Unless required by applicable law or agreed to in writing, software ** distributed under the License is distributed on an "AS IS" BASIS, ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. ** See the License for the specific language governing permissions and ** limitations under the License. */ package android.content.pm; parcelable PackageStats;
****************IPackageStatusObserver.aidl******************
/* ** ** Copyright 2007, The Android Open Source Project ** ** Licensed under the Apache License, Version 2.0 (the "License"); ** you may not use this file except in compliance with the License. ** You may obtain a copy of the License at ** ** http://www.apache.org/licenses/LICENSE-2.0 ** ** Unless required by applicable law or agreed to in writing, software ** distributed under the License is distributed on an "AS IS" BASIS, ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. ** See the License for the specific language governing permissions and ** limitations under the License. */ package android.content.pm; import android.content.pm.PackageStats; /** * API for package data change related callbacks from the Package Manager. * Some usage scenarios include deletion of cache directory, generate * statistics related to code, data, cache usage(TODO) * {@hide} */ oneway interface IPackageStatsObserver { void onGetStatsCompleted(in PackageStats pStats, boolean succeeded); }
這篇文章主要為大家詳細介紹了Android輸入框控件ClearEditText實現清除功能,感興趣的小伙伴們可以參考一下 本文給大家帶來
可以顯示在的Android任務,通過加載進度條的進展。進度條有兩種形狀。加載欄和加載微調(spinner)。在本章中,我們將討論微調(spinner)。Spinner 用
JSON代表JavaScript對象符號。它是一個獨立的數據交換格式,是XML的最佳替代品。本章介紹了如何解析JSON文件,並從中提取所需的信息。Android提供了四個
今天根據騰訊qq,我們做一個練習,來學習如何制作一個漂亮的布局。首先看一下官方圖片 還是一個啟動畫面,之後進入登錄頁面,導航頁面就不介紹了,大家可以參考微信的導