listpopwindow实现EditText下拉框显示列表
2019-01-21 本文已影响79人
koinzhang
1月23日更新:博主已实现提示词动态刷新(根据用户输入的关键词,litpopwindow显示关联提示词),可参考利用Adapter动态刷新数据实现联想词提示
这次是为了实现输入关键词,edittext下方显示联想关联词需求,所以用到了ListPopWindow.线上效果图:
效果图
博主为edittext控件设置文字状态监听方法,当输入框文字改变时,显示listpopwindow。同时为listpopwindow的item设置监听方法,当被某item点击时,将item的值传入edittext,同时隐藏listpopwindow。
代码如下:
package com.example.zyk97.infotest.Activity;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListPopupWindow;
import android.widget.TextView;
import android.widget.Toast;
import com.example.zyk97.infotest.R;
import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
public class CompanySet extends AppCompatActivity {
@BindView(R.id.back_firstin)
Button backFirstin;
@BindView(R.id.confirm_companyset)
Button confirmCompanyset;
@BindView(R.id.my_company)
TextView myCompany;
@BindView(R.id.input_company)
EditText inputCompany;
@BindView(R.id.set_company)
Button setCompany;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.companyset);
ButterKnife.bind(this);
showListPopWindow();
}
//显示提示
public void showListPopWindow() {
final ListPopupWindow listPopupWindow =new ListPopupWindow(this);
final String[] list = {"格里", "海尔", "美的"};
listPopupWindow.setAdapter(new ArrayAdapter<String>(this, R.layout.companyitem, list));//设置适配器
listPopupWindow.setAnchorView(inputCompany);//设置listpopowindow和哪个控件相邻
listPopupWindow.setModal(true);//指定listpopwindow是否阻止在显示的时候将内容输入其他窗口
listPopupWindow.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
inputCompany.setText(list[position]);
listPopupWindow.dismiss();//如果已经选择,隐藏listpopwindow
}
});
inputCompany.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (inputCompany.getText().toString().length() > 0) {
if(inputCompany.hasFocus()){
listPopupWindow.show();
}
}
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
@OnClick(R.id.set_company)
public void setMyCompany(View view){
myCompany.setText(inputCompany.getText());
}
//这里使用了AlertDialog
@OnClick(R.id.business1)
public void showBusiness1(View view){
AlertDialog.Builder builder=new AlertDialog.Builder(CompanySet.this);
builder.setTitle("家电行业公司");
final String[] cities={"青岛海尔","格力电器","美的集团"};
builder.setItems(cities, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
myCompany.setText(cities[which]);
}
});
builder.show();
}
}
companyset.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="40dp"
android:background="@color/dark_blue">
<Button
android:id="@+id/back_firstin"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_marginLeft="15dp"
android:layout_gravity="center"
android:background="@mipmap/back"
android:textColor="@color/black"
android:layout_weight="0.01"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="公司设置"
android:textColor="@color/white"
android:gravity="center"
android:layout_weight="1"/>
<Button
android:id="@+id/confirm_companyset"
android:layout_width="30dp"
android:layout_height="30dp"
android:layout_gravity="center"
android:layout_marginRight="15dp"
android:layout_weight="0.01"
android:background="@color/transparent"
android:textSize="13sp"
android:text="确定"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="80dp"
android:gravity="center">
<TextView
android:id="@+id/my_company"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@color/transparent"
android:gravity="center"
android:textSize="20dp"
android:textStyle="bold"
android:textColor="@color/black"
android:text="我的公司:未设置"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="100dp"
android:gravity="center">
<!--这里使用了自定义的ClearEditText,可以换成EditText!-->
<com.example.zyk97.infotest.Utils.ClearEditText
android:id="@+id/input_company"
android:layout_width="300dp"
android:layout_height="45dp"
android:gravity="center_vertical"
android:paddingLeft="5dp"
android:drawableLeft="@mipmap/searchcompany"
android:background="@drawable/button_setting"
android:hint="请输入公司名称"
android:textSize="15sp"/>
<Button
android:id="@+id/set_company"
android:layout_width="80dp"
android:layout_height="45dp"
android:text="设置"
android:stateListAnimator="@null"
android:textColor="@color/white"
android:background="@color/gray2"/>
</LinearLayout>
<TextView
android:layout_width="380dp"
android:layout_height="50dp"
android:gravity="center_vertical"
android:layout_gravity="center_horizontal"
android:text="按行业查找"/>
<GridLayout
android:layout_width="380dp"
android:layout_height="match_parent"
android:layout_gravity="center_horizontal"
android:orientation="horizontal"
android:columnCount="2"
android:rowCount="2">
<Button
android:id="@+id/business1"
android:layout_width="180dp"
android:layout_height="50dp"
android:layout_marginBottom="20dp"
android:layout_marginRight="20dp"
android:stateListAnimator="@null"
android:text="家电"
android:textColor="@color/white"
android:background="@color/dark_blue"/>
<Button
android:id="@+id/business2"
android:layout_width="180dp"
android:layout_height="50dp"
android:background="@color/light_blue"
android:stateListAnimator="@null"
android:text="食品"
android:textColor="@color/white"/>
<Button
android:id="@+id/business3"
android:layout_width="180dp"
android:layout_height="50dp"
android:background="@color/light_blue"
android:stateListAnimator="@null"
android:text="家具"
android:textColor="@color/white"/>
<Button
android:id="@+id/business4"
android:layout_width="180dp"
android:layout_height="50dp"
android:background="@color/light_blue"
android:stateListAnimator="@null"
android:text="汽车"
android:textColor="@color/white"/>
</GridLayout>
</LinearLayout>
companyitem.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/company_item"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:text="default"
android:paddingLeft="15dp"
android:textColor="@color/black"
android:textSize="18sp" />
本文样例完整代码InfoTest
总结一些自己运用listpopwindow时遇到的坑:
- listpopwindow不能直接在主线程之中加载,报错
Caused by: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
从错误信息我们也可以明白其原因,此问题根本原因就是由于将要弹出的dialog所要依附的View已经不存在导致的。
可能的情形:
当界面销毁后再弹出来;或者界面跳转时我们的view发生改变,listpopwindow依附的context发生变化或者界面未运行。
博主在检查代码后,发现是因为自己没注意在主线程中直接加载了listpopwindow,此时界面未运行,listpopwindow找不到依存的view,所以报错。