彈出PopupWindow背景變暗的實現
阿新 • • 發佈：2019-01-03
彈出PopuoWindow後 程式碼裡設定的是PopupWindow預設獲取焦點 所以PopupWindow顯示的時候其它控制元件點選是沒有反應的
用到的方法是
pwMyPopWindow.setFocusable(true);
程式碼裡還設定了
pwMyPopWindow.setBackgroundDrawable(this.getResources().getDrawable( R.mipmap.ic_launcher));// 設定背景圖片，不能在佈局中設定，要通過程式碼來設定 pwMyPopWindow.setOutsideTouchable(true);// 觸控popupwindow外部，popupwindow消失。這個要求你的popupwindow要有背景圖片才可以成功這樣點選PopupWindow外部就會自行消失 當我們彈出PopupWindow的時候讓背景變半透明 當PopuuWindow消失時讓背景變回原樣 這樣就實現了多數app中PouupWindow的使用效果 用到的方法是
WindowManager.LayoutParams lp = getWindow().getAttributes(); lp.alpha = bgAlpha; //0.0-1.0 getWindow().setAttributes(lp); 下面是程式碼
<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" tools:context=".MainActivity" android:background="#ffffff" > <LinearLayout android:id="@+id/ll_head_bar" android:layout_width="wrap_content" android:layout_height="400dp" android:orientation="vertical"> <!--這個圖片按鈕按下時彈出PopupWindow--> <ImageButton android:id="@+id/ib_operate_more" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@mipmap/ic_launcher" /> <!--這個按鈕是測試當PoupWindow顯示時點選此按鈕沒反應 因為此按鈕沒獲取焦點--> <Button android:layout_marginTop="200dp" android:layout_gravity="bottom" android:id="@+id/ib_operate_more2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="測試按鈕" /> </LinearLayout> </RelativeLayout>
<?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:orientation="vertical" > <TextView android:id="@+id/tv_list_item" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" android:minHeight="40dp" android:minWidth="120dp" android:textSize="20sp" /> </LinearLayout> list_item_popupwindow.xml
<?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="wrap_content" android:orientation="vertical" android:background="#d93c58b3" >" <ListView android:id="@+id/lv_popup_list" android:layout_width="match_parent" android:layout_height="match_parent" android:listSelector="#00000000" android:focusableInTouchMode="true" android:background="#d42a2a" /> </LinearLayout> task_detail_popupwindow.xml
package com.ceshi.popupwindow;
import android.app.Activity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.SimpleAdapter;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class MainActivity extends Activity {
private ImageButton ibOperationMore;
private Button ibOperationMore2;
List<Map<String, String>> moreList;
private PopupWindow pwMyPopWindow;// popupwindow
private ListView lvPopupList;// popupwindow中的ListView
private int NUM_OF_VISIBLE_LIST_ROWS = 3;// 指定popupwindow中Item的數量
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
iniData();
iniPopupWindow();
// 更多操作按鈕
ibOperationMore = (ImageButton) findViewById(R.id.ib_operate_more);
//ibOperationMore2是用來測試焦點問題 這樣popupwindow顯示的時候其他的控制元件是不能點選的
//換句話說其它控制元件點選時沒反應
ibOperationMore2 = (Button) findViewById(R.id.ib_operate_more2);
ibOperationMore2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this,"cao",Toast.LENGTH_SHORT).show();
}
});
ibOperationMore.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (pwMyPopWindow.isShowing()) {
pwMyPopWindow.dismiss();// 關閉
} else {
pwMyPopWindow.showAsDropDown(ibOperationMore);// 顯示
backgroundAlpha(0.7f);
}
}
});
}
private void iniData() {
moreList = new ArrayList<Map<String, String>>();
Map<String, String> map;
map = new HashMap<String, String>();
map.put("share_key", "複製");
moreList.add(map);
map = new HashMap<String, String>();
map.put("share_key", "刪除");
moreList.add(map);
map = new HashMap<String, String>();
map.put("share_key", "修改");
moreList.add(map);
}
private void iniPopupWindow() {
LayoutInflater inflater = (LayoutInflater) this
.getSystemService(LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.task_detail_popupwindow, null);
lvPopupList = (ListView) layout.findViewById(R.id.lv_popup_list);
pwMyPopWindow = new PopupWindow(layout, ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
pwMyPopWindow.setFocusable(true);// 加上這個popupwindow中的ListView才可以接收點選事件
lvPopupList.setAdapter(new SimpleAdapter(MainActivity.this, moreList,
R.layout.list_item_popupwindow, new String[] { "share_key" },
new int[] { R.id.tv_list_item }));
lvPopupList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
pwMyPopWindow.dismiss();
Toast.makeText(MainActivity.this,
moreList.get(position).get("share_key"),
Toast.LENGTH_LONG).show();
}
});
// 控制popupwindow的寬度和高度自適應
/*lvPopupList.measure(View.MeasureSpec.UNSPECIFIED,
View.MeasureSpec.UNSPECIFIED);
pwMyPopWindow.setWidth(lvPopupList.getMeasuredWidth());
pwMyPopWindow.setHeight((lvPopupList.getMeasuredHeight() + 20)
* NUM_OF_VISIBLE_LIST_ROWS);*/
// 控制popupwindow點選螢幕其他地方消失
pwMyPopWindow.setBackgroundDrawable(this.getResources().getDrawable(
R.mipmap.ic_launcher));// 設定背景圖片，不能在佈局中設定，要通過程式碼來設定
pwMyPopWindow.setOutsideTouchable(true);// 觸控popupwindow外部，popupwindow消失。這個要求你的popupwindow要有背景圖片才可以成功，如上
pwMyPopWindow.setOnDismissListener(new PopupWindow.OnDismissListener() {
@Override
public void onDismiss() {
//popupwindow消失的時候恢復成原來的透明度
backgroundAlpha(1f);
}
});
}
/**
* 設定新增螢幕的背景透明度
* @param bgAlpha
*/
public void backgroundAlpha(float bgAlpha)
{
WindowManager.LayoutParams lp = getWindow().getAttributes();
lp.alpha = bgAlpha; //0.0-1.0
getWindow().setAttributes(lp);
}
}
MainActivity
效果圖
