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Android自定義懸浮按鈕效果

更新時(shí)間：2021年09月27日 16:55:48 作者：貓吻魚(yú)

這篇文章主要為大家詳細(xì)介紹了Android自定義懸浮按鈕效果，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

本文實(shí)例為大家分享了Android自定義懸浮按鈕效果的具體代碼，供大家參考，具體內(nèi)容如下

以下：內(nèi)容沒(méi)有參考，寫的也是一個(gè)比較簡(jiǎn)單的例子，主要就是應(yīng)用切換前后臺(tái)時(shí)會(huì)顯示/隱藏懸浮窗。內(nèi)容僅用于自我記錄學(xué)習(xí)使用。

項(xiàng)目的開(kāi)發(fā)時(shí)應(yīng)用在登陸后顯示一個(gè)懸浮窗，同時(shí)顯示在線人數(shù)等一些其他信息，點(diǎn)擊懸浮按鈕可以顯示全局彈窗名單。開(kāi)發(fā)完成后，覺(jué)著需要記錄一下這種實(shí)現(xiàn)方式。所以寫一個(gè)簡(jiǎn)單的Demo。
Demo思路是通過(guò)啟動(dòng)Service來(lái)添加/移除懸浮窗，因?yàn)槭且粋€(gè)全局懸浮窗，所以選擇依附于Service。
在MyAppliction中監(jiān)聽(tīng)?wèi)?yīng)用的前后臺(tái)切換來(lái)添加或者隱藏懸浮窗。
其自定義的懸浮窗View在項(xiàng)目中是通過(guò)Canvas手動(dòng)繪制的，這里圖個(gè)省事直接加載一個(gè)布局文件。主要是想理解這種添加全局懸浮窗的方式，所以Demo樣式和功能能簡(jiǎn)則簡(jiǎn)。

MyAppliction

package com.example.qxb_810.floatbuttondemo.application;

import android.app.Activity;
import android.app.ActivityManager;
import android.app.Application;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.WindowManager;

import com.example.qxb_810.floatbuttondemo.service.FloatingActionService;

import java.util.List;

import static android.content.ContentValues.TAG;

/**
 * create 2018/12/1 13:31
 * desc 自定義Application
 */

public class MyApplication extends Application {
    private Intent mIntent;
    private WindowManager.LayoutParams mFloatingLayoutParams = new WindowManager.LayoutParams();

    public WindowManager.LayoutParams getmFloatingLayoutParams() {
        return mFloatingLayoutParams;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        this.monitorActivityLifecycle();
    }


    /**
     * 監(jiān)聽(tīng)程序Activity聲明周期
     */
    private void monitorActivityLifecycle() {
        this.registerActivityLifecycleCallbacks(new ActivityLifecycleCallbacks() {
            @Override
            public void onActivityCreated(Activity activity, Bundle savedInstanceState) {

            }

            @Override
            public void onActivityStarted(Activity activity) {
                if (isRunningForeground()){
                    mIntent = new Intent(MyApplication.this, FloatingActionService.class);
                    startService(mIntent);
                }
            }

            @Override
            public void onActivityResumed(Activity activity) {

            }

            @Override
            public void onActivityPaused(Activity activity) {

            }

            @Override
            public void onActivityStopped(Activity activity) {
                if (!isRunningForeground()){
                    stopService(mIntent);
                }
            }

            @Override
            public void onActivitySaveInstanceState(Activity activity, Bundle outState) {

            }

            @Override
            public void onActivityDestroyed(Activity activity) {

            }
        });
    }

    /**
     * 判斷應(yīng)用運(yùn)行在前后臺(tái)
     */
    public boolean isRunningForeground() {
        ActivityManager activityManager = (ActivityManager) this.getSystemService(Context.ACTIVITY_SERVICE);
        List<ActivityManager.RunningAppProcessInfo> appProcessInfos = activityManager.getRunningAppProcesses();    // 枚舉進(jìn)程
        for (ActivityManager.RunningAppProcessInfo appProcessInfo : appProcessInfos) {
            if (appProcessInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
                if (appProcessInfo.processName.equals(this.getApplicationInfo().processName)) {
                    Log.d(TAG, "EntryActivity isRunningForeGround");
                    return true;
                }
            }
        }
        Log.d(TAG, "EntryActivity isRunningBackGround");
        return false;
    }

}

FloatingActionService.java ---- 懸浮窗所依附的Service

package com.example.qxb_810.floatbuttondemo.service;

import android.app.Service;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.DisplayMetrics;
import android.view.Display;
import android.view.Gravity;
import android.view.WindowManager;
import android.widget.LinearLayout;
import android.widget.Toast;

import com.example.qxb_810.floatbuttondemo.application.MyApplication;
import com.example.qxb_810.floatbuttondemo.button.FloatingActionButton;

/**
 * create 2018/12/1 13:34
 * desc  懸浮按鈕Service
 */

public class FloatingActionService extends Service {
    private WindowManager mWindowManager;
    private FloatingActionButton mButton;
    private int mScreenWidth;
    private int mScreenHeight;

    @Override
    public void onCreate() {
        super.onCreate();
        this.initView();
        this.initEvent();

    }

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        this.mWindowManager.removeViewImmediate(this.mButton);
    }

    /**
     * 添加按鈕
     */
    private void initView() {
     // 通過(guò)WindowManager來(lái)添加懸浮窗
        this.mWindowManager = (WindowManager) this.getApplicationContext().getSystemService(WINDOW_SERVICE);
        Display display = this.mWindowManager.getDefaultDisplay();
        DisplayMetrics metrics = new DisplayMetrics();
        display.getMetrics(metrics);
        this.mScreenWidth = metrics.widthPixels;
        this.mScreenHeight = metrics.heightPixels;

        WindowManager.LayoutParams params = ((MyApplication) this.getApplication()).getmFloatingLayoutParams();
     
       if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mFloatingLayoutParams.type = WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY;
        } else {
            mFloatingLayoutParams.type = WindowManager.LayoutParams.TYPE_TOAST;
        }
        params.format = PixelFormat.RGBA_8888;
        params.flags = WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
        params.gravity = Gravity.LEFT | Gravity.TOP;    // 左上為坐標(biāo)點(diǎn)
        // 設(shè)置View大小
        params.height = 50;
        params.width = 50;
        // 設(shè)置View坐標(biāo)位置
        params.x = 0;
        params.y = mScreenHeight / 2;

        this.mButton = FloatingActionButton.getInstance(this);
        this.mWindowManager.addView(mButton, params);
    }

    /**
     *  初始化事件
     */
    private void initEvent() {
        this.mButton.setOnClickListener(v -> {
         // 項(xiàng)目中是在這里進(jìn)行添加 名單彈窗 和移除名單彈窗的操作，但名單彈窗的初始化不在這里
            Toast.makeText(this, "點(diǎn)擊了Button", Toast.LENGTH_SHORT).show();
        });
    }


}

FloatingActionButton – 彈窗按鈕

package com.example.qxb_810.floatbuttondemo.button;

import android.content.Context;
import android.graphics.Canvas;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.FrameLayout;
import android.widget.LinearLayout;

import com.example.qxb_810.floatbuttondemo.R;
import com.example.qxb_810.floatbuttondemo.application.MyApplication;

import static android.content.Context.WINDOW_SERVICE;

/**
 * create 2018/12/1 13:35
 * desc 自定義懸浮按鈕  --  這里隨便寫的一個(gè)布局文件
 */

public class FloatingActionButton extends FrameLayout {
    private Context mContext;
    private float mStartPointX;
    private float mStartPointY;
    private WindowManager mWindowManager;
    private WindowManager.LayoutParams mFloatingLayoutParams;
    private boolean isIntercept = false;
    private int mStatusHeight;

    public static FloatingActionButton getInstance(Context context) {
        FloatingActionButton button = new FloatingActionButton(context);
        return button;
    }

    public FloatingActionButton(Context context) {
        this(context, null);
    }

    public FloatingActionButton(Context context, @Nullable AttributeSet attrs) {
        this(context, attrs, -1);
    }

    public FloatingActionButton(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mContext = context;
        initView();
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
    }

    /**
     *  初始化View
     */
    private void initView(){
     // 隨便添加一個(gè)簡(jiǎn)單的View布局作為懸浮窗
        View view = LayoutInflater.from(mContext).inflate(R.layout.layout_floating_button, null, false);
        LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);
        this.addView(view, params);
        this.mWindowManager = (WindowManager) getContext().getApplicationContext().getSystemService(WINDOW_SERVICE);
        this.mFloatingLayoutParams = ((MyApplication) getContext().getApplicationContext()).getmFloatingLayoutParams();
        this.mStatusHeight = getStatusHeight(mContext);

    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        //獲取相對(duì)屏幕的坐標(biāo)，即以屏幕左上角為原點(diǎn)
        float rawX = event.getRawX();
        float rawY = event.getRawY() - mStatusHeight;   //statusHeight是系統(tǒng)狀態(tài)欄的高度
        switch (event.getAction()){
            case MotionEvent.ACTION_DOWN:
                this.mStartPointX = event.getX();
                this.mStartPointY = event.getY();
                isIntercept = false;
                break;
            case MotionEvent.ACTION_MOVE:
                mFloatingLayoutParams.x = (int)(rawX - mStartPointX);
                mFloatingLayoutParams.y = (int)(rawY - mStartPointY);
                this.mWindowManager.updateViewLayout(this, mFloatingLayoutParams);
                isIntercept = true;
                break;
            case MotionEvent.ACTION_UP:
                mFloatingLayoutParams.x = 0;        // 這里的策略是默認(rèn)松手吸附到左側(cè) 如果需要吸附到右側(cè)則改為mFloatingLayoutParams.x = mScreenWidth; mScreenWidth 是屏幕寬度，不想吸附則注釋這一句即可
                this.mWindowManager.updateViewLayout(this, mFloatingLayoutParams);
                break;
        }
        return isIntercept ? isIntercept : super.onTouchEvent(event);
    }

    /**
     * 狀態(tài)欄的高度
     */
    public static int getStatusHeight(Context context) {
        int statusHeight = -1;
        try {
            Class clazz = Class.forName("com.android.internal.R$dimen");    //使用反射獲取實(shí)例
            Object object = clazz.newInstance();
            int height = Integer.parseInt(clazz.getField("status_bar_height")
                    .get(object).toString());
            statusHeight = context.getResources().getDimensionPixelSize(height);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return statusHeight;
    }
}

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:background="@color/colorPrimary">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="12312313131313"
        android:textSize="20sp" />
</LinearLayout>

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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