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, Main2Service.class);
            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();
        }
    }
}