记录一写Android常用API

Location.getLatitude() 纬度

Location.getLongitude() 经度

获取 运行 应用包名 顶层交互 TOP包名 主Activity

//获取当前系统中 正在运行的 APK包名
ActivityManager mActivityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE) ;
            List<ActivityManager.RunningAppProcessInfo> appList = mActivityManager.getRunningAppProcesses() ;
            for (RunningAppProcessInfo running : appList) {
                    if (running.importance == RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
                                              Log.i("TAG","RunningAppName = "+running.processName);
                                              }
                       }

//获取顶层交互 TOP包名
ComponentName cn = mActivityManager.getRunningTasks(1).get(0).topActivity;
    String packageName = cn.getPackageName();

//根据包名 获取主Activity
PackageManager mPackageManager = context.getPackageManager();
     Intent it = new Intent(Intent.ACTION_MAIN);
     it.setPackage(packageName);// pkg为包名
     it.addCategory(Intent.CATEGORY_LAUNCHER);
     ComponentName ac = it.resolveActivity(mPackageManager);// mPackageManager为PackageManager实例
     if(ac != null){ //这里判断下 因为ac对象可能为NULL
          String classname = ac.getClassName();//此处得到Activity classname
}
说明：resolveActivity()方法默认使用MATCH_DEFAULT_ONLY的flag ，是指activity中的catetory必须要包含Android.intent.category.DEFAULT类型,否则会返回null。

最后不要忘记在AndroidManifest.xml中增加权限：

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

ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE); 
RunningTaskInfo info = manager.getRunningTasks(1).get(0); 
String shortClassName = info.topActivity.getShortClassName(); //类名 
String className = info.topActivity.getClassName(); //完整类名 
String packageName = info.topActivity.getPackageName(); //包名