用代码如何检测一个android程序是否在运行

/**
     * 检测一个android程序是否在运行
     * @param context
     * @param PackageName
     * @return
     */
    public static  boolean isServiceStarted(Context context,String PackageName) {
        //<uses-permission android:name="android.permission.GET_TASKS"/>
        //https://crazier9527.iteye.com/blog/1476134
        boolean isStarted =false;
        try {
            ActivityManager mActivityManager = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
            int intGetTastCounter = 1000;
            List<ActivityManager.RunningServiceInfo> mRunningService = mActivityManager.getRunningServices(intGetTastCounter );
            for (ActivityManager.RunningServiceInfo amService : mRunningService) {
                if(0 == amService.service.getPackageName().compareTo(PackageName)) {
                    isStarted = true;
                    break;
                }
            }
        }
        catch(SecurityException e) {
            e.printStackTrace();
        }
        return isStarted;
    }

　　权限

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

判断一个程序是否安装，如果安装就启动

start_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (isApkInstalled(getApplicationContext(),"包名")){
                    Intent intent = getPackageManager().getLaunchIntentForPackage("包名");
                    if (intent != null) {
                        intent.putExtra("type", "110");
                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                        startActivity(intent);
                    }
                }else {
                    Toast.makeText(getApplicationContext(),"没有安装", Toast.LENGTH_SHORT).show();
                }


            }
        });

判断一个程序是否安装

/**
     * 判断程序是否安装  
     * @param context
     * @param packageName
     * @return
     */
    public static boolean isApkInstalled(Context context, String packageName) {
        if (TextUtils.isEmpty(packageName)) {
            return false;
        }
        try {
            ApplicationInfo info = context.getPackageManager().getApplicationInfo(packageName, PackageManager.GET_UNINSTALLED_PACKAGES);
            return true;
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
            return false;
        }
    }