Android 系统工具类SystemUtils
包含的功能有：
獲取系統中所有APP應用、獲取用戶安裝的APP應用、根據包名和Activity啟動類查詢應用信息、跳轉到WIFI設置、WIFI網絡開關、移動網絡開關、GPS開關 當前若關則打開 當前若開則關閉、調節系統音量、設置亮度、獲取屏幕的亮度、跳轉到系統設置、獲取文件夾下所有文件、獲取視頻的縮略圖 、打開視頻文件...
工具類會持續更新，與大家共同學習進步。
SystemUtils.java
package com.player.utils;
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import java.io.File;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
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import android.app.Activity;
import android.app.PendingIntent;
import android.app.PendingIntent.CanceledException;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.ResolveInfo;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.media.AudioManager;
import android.media.ThumbnailUtils;
import android.net.ConnectivityManager;
import android.net.Uri;
import android.net.wifi.WifiManager;
import android.provider.Settings;
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import com.player.bean.AppInfo;
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public class SystemUtils {
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????/**
?????* 獲取系統所有APP應用
?????*
?????* @param context
?????*/
????public static ArrayList getAllApp(Context context) {
????????PackageManager manager = context.getPackageManager();
????????Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
????????mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
????????List<resolveinfo> apps = manager.queryIntentActivities(mainIntent, 0);
????????// 將獲取到的APP的信息按名字進行排序
????????Collections.sort(apps, new ResolveInfo.DisplayNameComparator(manager));
????????ArrayList appList = new ArrayList();
????????for (ResolveInfo info : apps) {
????????????AppInfo appInfo = new AppInfo();
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????????????appInfo.setAppLable(info.loadLabel(manager) + "");
????????????appInfo.setAppIcon(info.loadIcon(manager));
????????????appInfo.setAppPackage(info.activityInfo.packageName);
????????????appInfo.setAppClass(info.activityInfo.name);
????????????appList.add(appInfo);
????????????System.out.println("info.activityInfo.packageName="+info.activityInfo.packageName);
????????????System.out.println("info.activityInfo.name="+info.activityInfo.name);
????????}
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????????return appList;
????}
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????/**
?????* 獲取用戶安裝的APP應用
?????*
?????* @param context
?????*/
????public static ArrayList getUserApp(Context context) {
????????PackageManager manager = context.getPackageManager();
????????Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
????????mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
????????List<resolveinfo> apps = manager.queryIntentActivities(mainIntent, 0);
????????// 將獲取到的APP的信息按名字進行排序
????????Collections.sort(apps, new ResolveInfo.DisplayNameComparator(manager));
????????ArrayList appList = new ArrayList();
????????for (ResolveInfo info : apps) {
????????????AppInfo appInfo = new AppInfo();
????????????ApplicationInfo ainfo = info.activityInfo.applicationInfo;
????????????if ((ainfo.flags & ApplicationInfo.FLAG_SYSTEM) <= 0) {
????????????????appInfo.setAppLable(info.loadLabel(manager) + "");
????????????????appInfo.setAppIcon(info.loadIcon(manager));
????????????????appInfo.setAppPackage(info.activityInfo.packageName);
????????????????appInfo.setAppClass(info.activityInfo.name);
????????????????appList.add(appInfo);
????????????}
????????}
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????????return appList;
????}
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????/**
?????* 根據包名和Activity啟動類查詢應用信息
?????*
?????* @param cls
?????* @param pkg
?????* @return
?????*/
????public static AppInfo getAppByClsPkg(Context context, String pkg, String cls) {
????????AppInfo appInfo = new AppInfo();
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????????PackageManager pm = context.getPackageManager();
????????Drawable icon;
????????CharSequence label = "";
????????ComponentName comp = new ComponentName(pkg, cls);
????????try {
????????????ActivityInfo info = pm.getActivityInfo(comp, 0);
????????????icon = pm.getApplicationIcon(info.applicationInfo);
????????????label = pm.getApplicationLabel(pm.getApplicationInfo(pkg, 0));
????????} catch (NameNotFoundException e) {
????????????icon = pm.getDefaultActivityIcon();
????????}
????????appInfo.setAppClass(cls);
????????appInfo.setAppIcon(icon);
????????appInfo.setAppLable(label + "");
????????appInfo.setAppPackage(pkg);
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????????return appInfo;
????}
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????/**
?????* 跳轉到WIFI設置
?????*
?????* @param context
?????*/
????public static void intentWifiSetting(Context context) {
????????if (android.os.Build.VERSION.SDK_INT > 10) {
????????????// 3.0以上打開設置界面，也可以直接用ACTION_WIRELESS_SETTINGS打開到wifi界面
????????????context.startActivity(new Intent(
????????????????????android.provider.Settings.ACTION_SETTINGS));
????????} else {
????????????context.startActivity(new Intent(
????????????????????android.provider.Settings.ACTION_WIRELESS_SETTINGS));
????????}
????}
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????/**
?????* WIFI網絡開關
?????*
?????*/
????public static void toggleWiFi(Context context, boolean enabled) {
????????WifiManager wm = (WifiManager) context
????????????????.getSystemService(Context.WIFI_SERVICE);
????????wm.setWifiEnabled(enabled);
????}
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????/**
?????* 移動網絡開關
?????*/
????public static void toggleMobileData(Context context, boolean enabled) {
????????ConnectivityManager conMgr = (ConnectivityManager) context
????????????????.getSystemService(Context.CONNECTIVITY_SERVICE);
????????Class<!--?--> conMgrClass = null; // ConnectivityManager類
????????Field iConMgrField = null; // ConnectivityManager類中的字段
????????Object iConMgr = null; // IConnectivityManager類的引用
????????Class<!--?--> iConMgrClass = null; // IConnectivityManager類
????????Method setMobileDataEnabledMethod = null; // setMobileDataEnabled方法
????????try {
????????????// 取得ConnectivityManager類
????????????conMgrClass = Class.forName(conMgr.getClass().getName());
????????????// 取得ConnectivityManager類中的對象mService
????????????iConMgrField = conMgrClass.getDeclaredField("mService");
????????????// 設置mService可訪問
????????????iConMgrField.setAccessible(true);
????????????// 取得mService的實例化類IConnectivityManager
????????????iConMgr = iConMgrField.get(conMgr);
????????????// 取得IConnectivityManager類
????????????iConMgrClass = Class.forName(iConMgr.getClass().getName());
????????????// 取得IConnectivityManager類中的setMobileDataEnabled(boolean)方法
????????????setMobileDataEnabledMethod = iConMgrClass.getDeclaredMethod(
????????????????????"setMobileDataEnabled", Boolean.TYPE);
????????????// 設置setMobileDataEnabled方法可訪問
????????????setMobileDataEnabledMethod.setAccessible(true);
????????????// 調用setMobileDataEnabled方法
????????????setMobileDataEnabledMethod.invoke(iConMgr, enabled);
????????} catch (ClassNotFoundException e) {
????????????e.printStackTrace();
????????} catch (NoSuchFieldException e) {
????????????e.printStackTrace();
????????} catch (SecurityException e) {
????????????e.printStackTrace();
????????} catch (NoSuchMethodException e) {
????????????e.printStackTrace();
????????} catch (IllegalArgumentException e) {
????????????e.printStackTrace();
????????} catch (IllegalAccessException e) {
????????????e.printStackTrace();
????????} catch (InvocationTargetException e) {
????????????e.printStackTrace();
????????}
????}
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????/**
?????* GPS開關 當前若關則打開 當前若開則關閉
?????*/
????public static void toggleGPS(Context context) {
????????Intent gpsIntent = new Intent();
????????gpsIntent.setClassName("com.android.settings",
????????????????"com.android.settings.widget.SettingsAppWidgetProvider");
????????gpsIntent.addCategory("android.intent.category.ALTERNATIVE");
????????gpsIntent.setData(Uri.parse("custom:3"));
????????try {
????????????PendingIntent.getBroadcast(context, 0, gpsIntent, 0).send();
????????} catch (CanceledException e) {
????????????e.printStackTrace();
????????}
????}
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????/**
?????* 調節系統音量
?????*
?????* @param context
?????*/
????public static void holdSystemAudio(Context context) {
????????AudioManager audiomanage = (AudioManager) context
????????????????.getSystemService(Context.AUDIO_SERVICE);
????????// 獲取系統最大音量
????????// int maxVolume = audiomanage.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
????????// 獲取當前音量
????????// int currentVolume = audiomanage.getStreamVolume(AudioManager.STREAM_RING);
????????// 設置音量
????????// audiomanage.setStreamVolume(AudioManager.STREAM_SYSTEM, currentVolume, AudioManager.FLAG_PLAY_SOUND);
?????????
????????// 調節音量
????????// ADJUST_RAISE 增大音量，與音量鍵功能相同
????????// ADJUST_LOWER 降低音量
????????audiomanage.adjustStreamVolume(AudioManager.STREAM_SYSTEM,
????????????????AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
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????}
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????/**
?????* 設置亮度（每30遞增）
?????*
?????* @param resolver
?????* @param brightness
?????*/
????public static void setBrightness(Activity activity) {
????????ContentResolver resolver = activity.getContentResolver();
????????Uri uri = android.provider.Settings.System
????????????????.getUriFor("screen_brightness");
????????int nowScreenBri = getScreenBrightness(activity);
????????nowScreenBri = nowScreenBri <= 225 ? nowScreenBri + 30 : 30;
????????System.out.println("nowScreenBri==" + nowScreenBri);
????????android.provider.Settings.System.putInt(resolver, "screen_brightness",
????????????????nowScreenBri);
????????resolver.notifyChange(uri, null);
????}
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????/**
?????* 獲取屏幕的亮度
?????*
?????* @param activity
?????* @return
?????*/
????public static int getScreenBrightness(Activity activity) {
????????int nowBrightnessValue = 0;
????????ContentResolver resolver = activity.getContentResolver();
????????try {
????????????nowBrightnessValue = android.provider.Settings.System.getInt(
????????????????????resolver, Settings.System.SCREEN_BRIGHTNESS);
????????} catch (Exception e) {
????????????e.printStackTrace();
????????}
????????return nowBrightnessValue;
????}
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????/**
?????* 跳轉到系統設置
?????*
?????* @param context
?????*/
????public static void intentSetting(Context context) {
????????String pkg = "com.android.settings";
????????String cls = "com.android.settings.Settings";
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????????ComponentName component = new ComponentName(pkg, cls);
????????Intent intent = new Intent();
????????intent.setComponent(component);
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????????context.startActivity(intent);
????}
?????
????/**
?????* 獲取文件夾下所有文件
?????* @param path
?????* @return
?????*/
????public static ArrayList<file> getFilesArray(String path){
????????File file = new File(path);
????????File files[] = file.listFiles();
????????ArrayList<file> listFile = new ArrayList<file>();
????????if (files != null) {
????????????for (int i = 0; i < files.length; i++) {
????????????????if (files[i].isFile()) {
????????????????????listFile.add(files[i]);
????????????????}
????????????????if (files[i].isDirectory()) {
????????????????????listFile.addAll(getFilesArray(files[i].toString()));
????????????????}
????????????}
????????}
????????return listFile;
????}
?????
????/**
?????* 獲取視頻的縮略圖
?????* 先通過ThumbnailUtils來創建一個視頻的縮略圖，然后再利用ThumbnailUtils來生成指定大小的縮略圖。
?????* 如果想要的縮略圖的寬和高都小于MICRO_KIND，則類型要使用MICRO_KIND作為kind的值，這樣會節省內存。
?????* @param videoPath 視頻的路徑
?????* @param width 指定輸出視頻縮略圖的寬度
?????* @param height 指定輸出視頻縮略圖的高度度
?????* @param kind 參照MediaStore.Images.Thumbnails類中的常量MINI_KIND和MICRO_KIND。
?????*??????????? 其中，MINI_KIND: 512 x 384，MICRO_KIND: 96 x 96
?????* @return 指定大小的視頻縮略圖
?????*/?
????public static Bitmap getVideoThumbnail(String videoPath, int width, int height,?
????????????int kind) {?
????????Bitmap bitmap = null;?
????????// 獲取視頻的縮略圖??
????????bitmap = ThumbnailUtils.createVideoThumbnail(videoPath, kind);?
????????//System.out.println("w"+bitmap.getWidth());?
????????//System.out.println("h"+bitmap.getHeight());?
????????bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height,?
????????????????ThumbnailUtils.OPTIONS_RECYCLE_INPUT);?
????????return bitmap;?
????}
?????
????/**
?????* 打開視頻文件
?????* @param context
?????* @param file 視頻文件
?????*/
????public static void intentVideo(Context context, File file){
????????Intent intent = new Intent(Intent.ACTION_VIEW);
????????String type = "video/*";
????????Uri uri = Uri.fromFile(file);
????????intent.setDataAndType(uri, type);
????????context.startActivity(intent);
????}
}
</file></file></file></appinfo></appinfo></resolveinfo></appinfo></appinfo></appinfo></resolveinfo></appinfo>
開機清除用戶數據
添加開機廣播
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package com.topwise.airlinemanager;
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import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
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import android.app.ActivityManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.IPackageDataObserver;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.util.Log;
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/**
?* 開機廣播
?* @author XiaoSai
?*
?*/
public class CleanDataReceiverd extends BroadcastReceiver {
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????@Override
????public void onReceive(Context context, Intent intent) {
????????if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)) {
????????????//清除用戶數據
????????????cleanUserData(context);
????????}
????}
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????class ClearUserDataObserver extends IPackageDataObserver.Stub {
????????public void onRemoveCompleted(final String packageName,
????????????????final boolean succeeded) {
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????????}
????}
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????private void cleanUserData(Context context) {
????????PackageManager manager = context.getPackageManager();
????????List<packageinfo> packages = manager.getInstalledPackages(0);
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????????ClearUserDataObserver mClearDataObserver = new ClearUserDataObserver();
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????????ActivityManager am = (ActivityManager) context
????????????????.getSystemService(Context.ACTIVITY_SERVICE);
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????????Method targetMethod = null;
????????Class<!--?--> temp = am.getClass();
????????// String className = temp.getName();
????????Method[] methods = temp.getMethods();
????????for (int j = 0; j < methods.length; j++) {
????????????if (("clearApplicationUserData".equals(methods[j].getName()))) {
????????????????targetMethod = methods[j];
????????????????break;
????????????}
????????}
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????????String pkg = null;
????????if (packages != null && packages.size() > 0) {
????????????for (int i = 0; i < packages.size(); i++) {
????????????????pkg = packages.get(i).packageName;
????????????????if (pkg.equals("com.sina.weibotab")
????????????????????????|| pkg.equals("com.tencent.android.pad")
????????????????????????|| pkg.equals("com.tencent.hd.qq")
????????????????????????|| pkg.equals("com.tencent.WBlog")
????????????????????????|| pkg.equals("com.tencent.mm")) {
????????????????????try {
????????????????????????targetMethod.invoke(am, pkg, mClearDataObserver);
????????????????????????Log.i("XIAOS", "clean pgk "+pkg);
????????????????????} catch (IllegalArgumentException e) {
????????????????????????e.printStackTrace();
????????????????????} catch (IllegalAccessException e) {
????????????????????????e.printStackTrace();
????????????????????} catch (InvocationTargetException e) {
????????????????????????e.printStackTrace();
????????????????????}
????????????????}
????????????}
????????}
????}
}
</packageinfo>
清除用戶數據需要調用ActivityManager類中的clearApplicationUserData方法，但是這個方法被系統給隱藏類，調用不了，不過我們可以通過反射機制來調用
AndroidManifest.xml
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<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.player.playlauncher" android:versioncode="1" android:versionname="1.0" android:shareduserid="android.uid.system">
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????<uses-sdk android:minsdkversion="8" android:targetsdkversion="17">
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????<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED">
????<uses-permission android:name="android.permission.CLEAR_APP_USER_DATA">
?????
?????
?????????
????????????<intent-filter>
?????????????????
????????????????<category android:name="android.intent.category.LAUNCHER">
????????????</category></action></intent-filter>
????????</activity>
?????????
????????<receiver android:name=".CleanDataReceiverd">
????????????<intent-filter>
?????????????????
????????????</action></intent-filter>
????????</receiver>
????</application>
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</uses-permission></uses-permission></uses-sdk></manifest>
保存可能會報錯，clean 一下項目就可以了
最后還需要在 Android.mk 中添加 一行
LOCAL_CERTIFICATE := platform
成功源于不斷的學習和積累 !
轉載于:https://www.cnblogs.com/hudabing/p/4708535.html
總結
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