開始我以為懸浮窗口,可以用Android中得PopupWindow 來實現,雖然也實現了,但局限性非常大。比如PopupWindow必須要有載體View,也就是說,必須要指定在那個View的上面來實現。以該View為相對位置,來顯示PopupWindow。這就局限了其智能在用戶交互的窗口上,相對的顯示。而無法自由的拖動位置和在桌面顯示。
于是查閱了一些資料,有兩種實現方法。一種是自定義Toast,Toast是運行于所有界面之上的,也就是說沒有界面可以覆蓋它。另一種是Android中得CompatModeWrapper類,ConmpatModeWrapper是基類,實現大部分功能的是它的內部類WindowManagerImpl。該對象可以通過getApplication().getSystemService(Context.WINDOW_SERVICE)得到。(注:如果是通過activity.getSystemService(Context.WINDOW_SERVICE)得到的只是屬于Activity的LocalWindowManager)。
簡單的介紹之后,我們直接來看代碼實現,注釋已經寫在代碼中。
MainActivity.javapackage com.example.floatviewdemo;import com.example.floatviewdemo.service.FloatViewService;import android.app.Activity;import android.content.Intent;import android.os.Bundle;public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override protected void onStart() { Intent intent = new Intent(MainActivity.this, FloatViewService.class); //啟動FloatViewService startService(intent); super.onStart(); } @Override protected void onStop() { // 銷毀懸浮窗 Intent intent = new Intent(MainActivity.this, FloatViewService.class); //終止FloatViewService stopService(intent); super.onStop(); }}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#fff" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.floatviewdemo.MainActivity" > <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /></RelativeLayout>
實現懸浮窗功能的service類
package com.example.floatviewdemo.service;import com.example.floatviewdemo.R;import android.annotation.SuppressLint;import android.app.Service;import android.content.Intent;import android.graphics.PixelFormat;import android.os.IBinder;import android.util.Log;import android.view.Gravity;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnTouchListener;import android.view.WindowManager;import android.view.WindowManager.LayoutParams;import android.widget.ImageButton;import android.widget.LinearLayout;import android.widget.Toast;public class FloatViewService extends Service { private static final String TAG = "FloatViewService"; //定義浮動窗口布局 private LinearLayout mFloatLayout; private WindowManager.LayoutParams wmParams; //創建浮動窗口設置布局參數的對象 private WindowManager mWindowManager; private ImageButton mFloatView; @Override public void onCreate() { super.onCreate(); Log.i(TAG, "onCreate"); createFloatView(); } @SuppressWarnings("static-access") @SuppressLint("InflateParams") private void createFloatView() { wmParams = new WindowManager.LayoutParams(); //通過getApplication獲取的是WindowManagerImpl.CompatModeWrapper mWindowManager = (WindowManager)getApplication().getSystemService(getApplication().WINDOW_SERVICE); //設置window type wmParams.type = LayoutParams.TYPE_PHONE; //設置圖片格式,效果為背景透明 wmParams.format = PixelFormat.RGBA_8888; //設置浮動窗口不可聚焦(實現操作除浮動窗口外的其他可見窗口的操作) wmParams.flags = LayoutParams.FLAG_NOT_FOCUSABLE; //調整懸浮窗顯示的停靠位置為左側置頂 wmParams.gravity = Gravity.LEFT | Gravity.TOP; // 以屏幕左上角為原點,設置x、y初始值,相對于gravity wmParams.x = 0; wmParams.y = 152; //設置懸浮窗口長寬數據 wmParams.width = WindowManager.LayoutParams.WRAP_CONTENT; wmParams.height = WindowManager.LayoutParams.WRAP_CONTENT; LayoutInflater inflater = LayoutInflater.from(getApplication()); //獲取浮動窗口視圖所在布局 mFloatLayout = (LinearLayout) inflater.inflate(R.layout.alert_window_menu, null); //添加mFloatLayout mWindowManager.addView(mFloatLayout, wmParams); //浮動窗口按鈕 mFloatView = (ImageButton) mFloatLayout.findViewById(R.id.alert_window_imagebtn); mFloatLayout.measure(View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED), View.MeasureSpec .makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)); //設置監聽浮動窗口的觸摸移動 mFloatView.setOnTouchListener(new OnTouchListener() { boolean isClick; @SuppressLint("ClickableViewAccessibility") @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: mFloatView.setBackgroundResource(R.drawable.circle_red); isClick = false; break; case MotionEvent.ACTION_MOVE: isClick = true; // getRawX是觸摸位置相對于屏幕的坐標,getX是相對于按鈕的坐標 wmParams.x = (int) event.getRawX() - mFloatView.getMeasuredWidth() / 2; // 減25為狀態欄的高度 wmParams.y = (int) event.getRawY() - mFloatView.getMeasuredHeight() / 2 - 75; // 刷新 mWindowManager.updateViewLayout(mFloatLayout, wmParams); return true; case MotionEvent.ACTION_UP: mFloatView.setBackgroundResource(R.drawable.circle_cyan); return isClick;// 此處返回false則屬于移動事件,返回true則釋放事件,可以出發點擊否。 default: break; } return false; } }); mFloatView.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Toast.makeText(FloatViewService.this, "一百塊都不給我!", Toast.LENGTH_SHORT).show(); } }); } @Override public void onDestroy() { super.onDestroy(); if(mFloatLayout != null) { //移除懸浮窗口 mWindowManager.removeView(mFloatLayout); } } @Override public IBinder onBind(Intent intent) { return null; } }
懸浮窗的xml文件
alert_window_menu.xml<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" > <ImageButton android:id="@+id/alert_window_imagebtn" android:layout_width="50dp" android:layout_height="50dp" android:background="@drawable/float_window_menu" android:contentDescription="@null" /></LinearLayout>
以上內容是實現Android 全界面懸浮按鈕的全部敘述,希望大家喜歡。
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