有没有办法检查Twitter应用程序是否在后台运行

Question

我想知道是否有办法检查Twitter应用程序是否在后台运行。

Answer 1

You can use the Running Processes:

ActivityManager activityManager = (ActivityManager) this.getSystemService( ACTIVITY_SERVICE );
List<RunningAppProcessInfo> procInfos = actvityManager.getRunningAppProcesses();
for(int i = 0; i < procInfos.size(); i++){
    if(procInfos.get(i).processName.equals("com.twitter.android")) {
        Toast.makeText(getApplicationContext(), "Twitter is running", Toast.LENGTH_LONG).show();
    }
}

I'm not entirely sure why you would want to know this though.

EDIT:

Since you only need to know if it is installed, this code will suit you better:

private boolean isTwitterInstalled() {
    PackageManager pm = getPackageManager();
    boolean twitter_installed = false;
    try {
        pm.getPackageInfo("com.twitter.android", PackageManager.GET_ACTIVITIES);
        twitter_installed = true;
    } catch (PackageManager.NameNotFoundException e) {
        twitter_installed = false;
    }
    return app_installed;
}