Android 系统工具类SystemUtils
包含的功能有：
获取系统中所有APP应用、获取用户安装的APP应用、根据包名和Activity启动类查询应用信息、跳转到WIFI设置、WIFI网络开关、移动网络开关、GPS开关 当前若关则打开 当前若开则关闭、调节系统音量、设置亮度、获取屏幕的亮度、跳转到系统设置、获取文件夹下所有文件、获取视频的缩略图 、打开视频文件...
工具类会持续更新，与大家共同学习进步。
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 {
/**
* 获取系统所有APP应用
*
* @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);
// 将获取到的APP的信息按名字进行排序
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;
}
/**
* 获取用户安装的APP应用
*
* @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);
// 将获取到的APP的信息按名字进行排序
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;
}
/**
* 根据包名和Activity启动类查询应用信息
*
* @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;
}
/**
* 跳转到WIFI设置
*
* @param context
*/
public static void intentWifiSetting(Context context) {
if (android.os.Build.VERSION.SDK_INT > 10) {
// 3.0以上打开设置界面，也可以直接用ACTION_WIRELESS_SETTINGS打开到wifi界面
context.startActivity(new Intent(
android.provider.Settings.ACTION_SETTINGS));
} else {
context.startActivity(new Intent(
android.provider.Settings.ACTION_WIRELESS_SETTINGS));
}
}
/**
* WIFI网络开关
*
*/
public static void toggleWiFi(Context context, boolean enabled) {
WifiManager wm = (WifiManager) context
.getSystemService(Context.WIFI_SERVICE);
wm.setWifiEnabled(enabled);
}
/**
* 移动网络开关
*/
public static void toggleMobileData(Context context, boolean enabled) {
ConnectivityManager conMgr = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
Class<!--?--> conMgrClass = null; // ConnectivityManager类
Field iConMgrField = null; // ConnectivityManager类中的字段
Object iConMgr = null; // IConnectivityManager类的引用
Class<!--?--> iConMgrClass = null; // IConnectivityManager类
Method setMobileDataEnabledMethod = null; // setMobileDataEnabled方法
try {
// 取得ConnectivityManager类
conMgrClass = Class.forName(conMgr.getClass().getName());
// 取得ConnectivityManager类中的对象mService
iConMgrField = conMgrClass.getDeclaredField("mService");
// 设置mService可访问
iConMgrField.setAccessible(true);
// 取得mService的实例化类IConnectivityManager
iConMgr = iConMgrField.get(conMgr);
// 取得IConnectivityManager类
iConMgrClass = Class.forName(iConMgr.getClass().getName());
// 取得IConnectivityManager类中的setMobileDataEnabled(boolean)方法
setMobileDataEnabledMethod = iConMgrClass.getDeclaredMethod(
"setMobileDataEnabled", Boolean.TYPE);
// 设置setMobileDataEnabled方法可访问
setMobileDataEnabledMethod.setAccessible(true);
// 调用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开关 当前若关则打开 当前若开则关闭
*/
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();
}
}
/**
* 调节系统音量
*
* @param context
*/
public static void holdSystemAudio(Context context) {
AudioManager audiomanage = (AudioManager) context
.getSystemService(Context.AUDIO_SERVICE);
// 获取系统最大音量
// int maxVolume = audiomanage.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
// 获取当前音量
// int currentVolume = audiomanage.getStreamVolume(AudioManager.STREAM_RING);
// 设置音量
// audiomanage.setStreamVolume(AudioManager.STREAM_SYSTEM, currentVolume, AudioManager.FLAG_PLAY_SOUND);
// 调节音量
// ADJUST_RAISE 增大音量，与音量键功能相同
// ADJUST_LOWER 降低音量
audiomanage.adjustStreamVolume(AudioManager.STREAM_SYSTEM,
AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
}
/**
* 设置亮度（每30递增）
*
* @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);
}
/**
* 获取屏幕的亮度
*
* @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;
}
/**
* 跳转到系统设置
*
* @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);
}
/**
* 获取文件夹下所有文件
* @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;
}
/**
* 获取视频的缩略图
* 先通过ThumbnailUtils来创建一个视频的缩略图，然后再利用ThumbnailUtils来生成指定大小的缩略图。
* 如果想要的缩略图的宽和高都小于MICRO_KIND，则类型要使用MICRO_KIND作为kind的值，这样会节省内存。
* @param videoPath 视频的路径
* @param width 指定输出视频缩略图的宽度
* @param height 指定输出视频缩略图的高度度
* @param kind 参照MediaStore.Images.Thumbnails类中的常量MINI_KIND和MICRO_KIND。
* 其中，MINI_KIND: 512 x 384，MICRO_KIND: 96 x 96
* @return 指定大小的视频缩略图
*/
public static Bitmap getVideoThumbnail(String videoPath, int width, int height,
int kind) {
Bitmap bitmap = null;
// 获取视频的缩略图
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;
}
/**
* 打开视频文件
* @param context
* @param file 视频文件
*/
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>
开机清除用户数据
添加开机广播
?
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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;
/**
* 开机广播
* @author XiaoSai
*
*/
public class CleanDataReceiverd extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(Intent.ACTION_BOOT_COMPLETED)) {
//清除用户数据
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<packageinfo> 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();
}
}
}
}
}
}
</packageinfo>
清除用户数据需要调用ActivityManager类中的clearApplicationUserData方法，但是这个方法被系统给隐藏类，调用不了，不过我们可以通过反射机制来调用
AndroidManifest.xml
?
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<manifest xmlns:andro>
<intent-filter>
</action></intent-filter>
</receiver>
</application>
</uses-permission></uses-permission></uses-sdk></manifest>
保存可能会报错，clean 一下项目就可以了
最后还需要在 Android.mk 中添加 一行
LOCAL_CERTIFICATE := platform
成功源于不断的学习和积累 !