android 8.0 悬浮窗 最简demo

MainActivity.java文件

package com.example.performance;

import android.app.Activity;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.provider.Settings;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        if (Build.VERSION.SDK_INT >= 23) {
            if (Settings.canDrawOverlays(MainActivity.this)) {
//                Intent intent = new Intent(MainActivity.this, FloatingService.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);
            }
        } else {
            //SDK在23以下，不用管.
//            Intent intent = new Intent(MainActivity.this, FloatingService.class);
//            startService(intent);
//            finish();

        }
      setContentView(R.layout.activity_main);
      Button startFloatWindow=(Button) findViewById(R.id.btn_floatWindows);
      startFloatWindow.setOnClickListener(new OnClickListener() {
          @Override
          public void onClick(View v) {
              Intent intent=new Intent(MainActivity.this, FloatingService.class);
              startService(intent);
              finish();
          }
      });
      super.onCreate(savedInstanceState);
    }
}

　　

FloatingService.java 文件

package com.example.performance;

import android.annotation.SuppressLint;
import android.app.Service;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.PixelFormat;
import android.os.Build;
import android.os.IBinder;
import android.provider.Settings;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;

@SuppressLint({ "ShowToast", "ClickableViewAccessibility" })
public class FloatingService extends Service {

    @Override
    public IBinder onBind(Intent intent) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        showFloatingWindow();
        return super.onStartCommand(intent, flags, startId);
    }

    private void showFloatingWindow() {

        if (Settings.canDrawOverlays(this)) {
            // 获取WindowManager服务
            final WindowManager windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);

            // 新建悬浮窗控件
            final Button button = new Button(getApplicationContext());
            button.setText("Floating Window");
            button.setBackgroundColor(Color.BLUE);

            // 设置LayoutParam
            final WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams();
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
            } else {
                layoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
            }
            layoutParams.format = PixelFormat.RGBA_8888;
            layoutParams.width = 500;
            layoutParams.height = 100;
            layoutParams.x = 100;
            layoutParams.y = 300;
            layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;

            // 将悬浮窗控件添加到WindowManager
            windowManager.addView(button, layoutParams);
            button.setOnTouchListener(new View.OnTouchListener(){
                private int x;
                private int y;
                @Override
                public boolean onTouch(View view, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    x = (int) event.getRawX();
                    y = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_MOVE:
                    int nowX = (int) event.getRawX();
                    int nowY = (int) event.getRawY();
                    int movedX = nowX - x;
                    int movedY = nowY - y;
                    x = nowX;
                    y = nowY;
                    layoutParams.x = layoutParams.x + movedX;
                    layoutParams.y = layoutParams.y + movedY;

                    // 更新悬浮窗控件布局
                    windowManager.updateViewLayout(view, layoutParams);
                    break;
                default:
                    break;
                    }
                    return false;
                }
            });
        }
    }

}

　　

activity_main.xml 文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.performance"
    android:versionCode="1"
    android:versionName="1.0" >
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<uses-permission android:name="android.permission.SYSTEM_OVERLAY_WINDOW"/>
    <uses-sdk
        android:minSdkVersion="26"
        android:targetSdkVersion="26" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".FloatingService"/>
    </application>

</manifest>

AndroidManifest.xml 文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.performance"
    android:versionCode="1"
    android:versionName="1.0" >
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
<uses-permission android:name="android.permission.SYSTEM_OVERLAY_WINDOW"/>
    <uses-sdk
        android:minSdkVersion="26"
        android:targetSdkVersion="26" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <service android:name=".FloatingService"/>
    </application>

</manifest>