package com.bell.floatlayoutdemo;

import android.annotation.SuppressLint;
import android.content.Intent;
import android.os.Bundle;
import android.provider.Settings;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

        @SuppressLint("NewApi")
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            //当AndroidSDK>=23及Android版本6.0及以上时，需要获取OVERLAY_PERMISSION.
            //使用canDrawOverlays用于检查，下面为其源码。其中也提醒了需要在manifest文件中添加权限.
            /**
             * Checks if the specified context can draw on top of other apps. As of API
             * level 23, an app cannot draw on top of other apps unless it declares the
             * {@link android.Manifest.permission#SYSTEM_ALERT_WINDOW} permission in its
             * manifest, <em>and</em> the user specifically grants the app this
             * capability. To prompt the user to grant this approval, the app must send an
             * intent with the action
             * {@link android.provider.Settings#ACTION_MANAGE_OVERLAY_PERMISSION}, which
             * causes the system to display a permission management screen.
             *
             */
            if (Settings.canDrawOverlays(MainActivity.this))
            {
                Intent intent = new Intent(MainActivity.this,MainService.class);
                Toast.makeText(MainActivity.this,"已开启Toucher",Toast.LENGTH_SHORT).show();
                startService(intent);
                finish();
            }else
            {
                //若没有权限，提示获取.
                Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION);
                Toast.makeText(MainActivity.this,"需要取得权限以使用悬浮窗",Toast.LENGTH_SHORT).show();
                startActivity(intent);
                finish();
            }
        }
}