android view可视区域,Android使用WindowManager构造悬浮view
一般在android顯示一個(gè)View都是通過Activity的setContentView設(shè)置的,但是還有一種方法,可以直接使用WindowManager在整個(gè)應(yīng)用的最上層繪制我們需要顯示的view,總體的效果類似于AlertDialog的彈出效果。
使用WindowManager構(gòu)造這樣的一個(gè)懸浮View也比較簡單,直接通過windowmanager.addView()方法即可。
package com.gearmotion.app.windowmanagermotion;
import android.content.Context;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.Button;
public class MainActivity extends AppCompatActivity implements View.OnClickListener, View.OnTouchListener {
Button mShowBtn;
Button mHideBtn;
WindowManager mWm;
LayoutInflater mLayoutInflater;
View mWindowView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mShowBtn = (Button) this.findViewById(R.id.showbtn);
mHideBtn = (Button) this.findViewById(R.id.hidebtn);
mShowBtn.setOnClickListener(this);
mHideBtn.setOnClickListener(this);
init();
}
private void init() {
mWm = (WindowManager) this.getApplicationContext().getSystemService(Context.WINDOW_SERVICE);
mLayoutInflater = LayoutInflater.from(this);
}
@Override
public void onClick(View v) {
if (mShowBtn.hashCode() == v.hashCode()) { //顯示W(wǎng)indowManager
show();
}
if (mHideBtn.hashCode() == v.hashCode()) { //隱藏windowmanager
hide();
}
}
private void show() {
mWindowView = mLayoutInflater.inflate(R.layout.item_layout, null);
View popView = mWindowView.findViewById(R.id.root);
//設(shè)置popView的觸摸事件,以便點(diǎn)擊空白區(qū)域的時(shí)候使懸浮view消失
popView.setOnTouchListener(this);
WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
//窗口類型同系統(tǒng)彈出框
lp.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
//響應(yīng)輸入法
//lp.flags = WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM;
//透明層
lp.format = PixelFormat.TRANSPARENT;
lp.width = WindowManager.LayoutParams.MATCH_PARENT;
lp.height = WindowManager.LayoutParams.MATCH_PARENT;
lp.gravity = Gravity.CENTER_VERTICAL;
mWm.addView(mWindowView, lp);
}
private void hide() {
if (mWindowView != null && mWindowView.getParent() != null) {
mWm.removeView(mWindowView);
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
//獲取主view的可視區(qū)域
Rect globalRect = new Rect();
//獲取懸浮view的可視區(qū)域
Rect tmpRect = new Rect();
v.getGlobalVisibleRect(globalRect);
View child = ((ViewGroup) v).getChildAt(0);
child.getHitRect(tmpRect);
if (!tmpRect.contains(x, y) && globalRect.contains(x, y)) {
hide();
}
return true;
}
}
activity_main.xml:
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
android:id="@+id/showbtn"
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center"
android:text="show" />
android:id="@+id/hidebtn"
android:layout_width="match_parent"
android:layout_height="50dp"
android:gravity="center"
android:text="hide" />
item_layout.xml:
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:id="@+id/root"
android:orientation="vertical">
android:layout_width="match_parent"
android:layout_height="50dp"
android:text="I am WindowManager layout view"
android:textSize="20sp"
android:gravity="center"
android:layout_gravity="center"
android:background="#FFF8DC"
android:textColor="#7AC5CD"/>
實(shí)現(xiàn)效果如下:
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