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 Android教程網 >> Android技術 >> 關於Android編程 >> Android 系統工具類SystemUtils收集整理(持續更新)

Android 系統工具類SystemUtils收集整理(持續更新)

編輯:關於Android編程

最近做的功能中涉及到了一些關於系統方面的東西,自己摸索以及網上搜集整理出來了一個工具類方便調用

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;

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;

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;

import com.player.bean.AppInfo;

public class SystemUtils {

	/**
	 * 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 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();

			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);
		}

		return appList;
	}

	/**
	 * 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 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);
			}
		}

		return appList;
	}

	/**
	 * 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();

		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);

		return appInfo;
	}

	/**
	 * 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));
		}
	}

	/**
	 * WIFI網絡開關
	 * 
	 */
	public static void toggleWiFi(Context context, boolean enabled) {
		WifiManager wm = (WifiManager) context
				.getSystemService(Context.WIFI_SERVICE);
		wm.setWifiEnabled(enabled);
	}

	/**
	 * 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();
		}
	}

	/**
	 * 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();
		}
	}

	/**
	 * 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);

	}

	/**
	 * 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);
	}

	/**
	 * 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;
	}

	/**
	 * 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";

		ComponentName component = new ComponentName(pkg, cls);
		Intent intent = new Intent();
		intent.setComponent(component);

		context.startActivity(intent);
	}
	
	/**
	 * 獲取文件夾下所有文件
	 * @param path
	 * @return
	 */
	public static ArrayList getFilesArray(String path){
		File file = new File(path);
		File files[] = file.listFiles();
		ArrayList listFile = new ArrayList();
		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,然後再利用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於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);
	}
}


開機清除用戶數據

添加開機廣播

package com.topwise.airlinemanager;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;

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;

/**
 * 開機廣播
 * @author XiaoSai
 *
 */
public class CleanDataReceiverd extends BroadcastReceiver {

	@Override
	public void onReceive(Context context, Intent intent) {
		if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)) {
			//清除用戶數據
			cleanUserData(context);
		}
	}

	class ClearUserDataObserver extends IPackageDataObserver.Stub {
		public void onRemoveCompleted(final String packageName,
				final boolean succeeded) {

		}
	}

	private void cleanUserData(Context context) {
		PackageManager manager = context.getPackageManager();
		List packages = manager.getInstalledPackages(0);

		ClearUserDataObserver mClearDataObserver = new ClearUserDataObserver();

		ActivityManager am = (ActivityManager) context
				.getSystemService(Context.ACTIVITY_SERVICE);

		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;
			}
		}

		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();
					}
				}
			}
		}
	}
}

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



    

    
    
    
    
        
            
                
                
            
        
        
        
            
                
            
        
    



保存可能會報錯,clean 一下項目就可以了

最後還需要在 Android.mk 中添加 一行

LOCAL_CERTIFICATE := platform


成功源於不斷的學習和積累 !

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