android常用的几个获取包或activity以及判断前后台等

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一、判断前台后台
转载链接：http://www.jb51.net/article/45084.htm
1、通过RunningTaskInfo类判断（需要额外权限）：

<uses-permission android:name="android.permission.GET_TASKS" />

/**     *判断当前应用程序处于前台还是后台     */    public static boolean isApplicationBroughtToBackground(final Context context) {        ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);        List<RunningTaskInfo> tasks = am.getRunningTasks(1);        if (!tasks.isEmpty()) {            ComponentName topActivity = tasks.get(0).topActivity;            if (!topActivity.getPackageName().equals(context.getPackageName())) {                return true;            }        }        return false;    }

需要在AndroidMenitfest.xml文件中添加以下权限
复制代码代码如下:

2、通过RunningAppProcessInfo类判断（不需要额外权限）：
复制代码代码如下:

public static boolean isBackground(Context context) {    ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);    List<RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();    for (RunningAppProcessInfo appProcess : appProcesses) {         if (appProcess.processName.equals(context.getPackageName())) {                if (appProcess.importance == RunningAppProcessInfo.IMPORTANCE_BACKGROUND) {                          Log.i("后台", appProcess.processName);                          return true;                }else{                          Log.i("前台", appProcess.processName);                          return false;                }           }    }    return false;}

二、获取桌面所有应用

//**     * 获得属于桌面的应用的应用包名称     * @return 返回包含所有包名的字符串列表     *//*    private List<String> getHomes() {        List<String> names = new ArrayList<String>();        PackageManager packageManager = this.getPackageManager();        // 属性        Intent intent = new Intent(Intent.ACTION_MAIN);        intent.addCategory(Intent.CATEGORY_HOME);        List<ResolveInfo> resolveInfo = packageManager.queryIntentActivities(intent,                PackageManager.MATCH_DEFAULT_ONLY);        for(ResolveInfo ri : resolveInfo) {            names.add(ri.activityInfo.packageName);        }        return names;    }

 *//**     * 判断当前界面是否是桌面     *//*    public boolean isHome(){        if(mActivityManager == null) {            mActivityManager = (ActivityManager)getSystemService(Context.ACTIVITY_SERVICE);        }        List<RunningTaskInfo> rti = mActivityManager.getRunningTasks(1);        return homeList.contains(rti.get(0).topActivity.getPackageName());    }

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