Android开发-自定义View-AndroidStudio(七)popupwindow

时间：2022-10-27 15:53:25
转载请注明出处： http://blog.csdn.net/iwanghang/article/details/53763364
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老规矩，先上GIF动态图，看个效果，如果符合你的项目或者确定你要了解的内容，再往下看吧：
项目下载： http://download.csdn.net/detail/iwanghang/9716587

Android开发-自定义View-AndroidStudio(七)popupwindow

MainActivity.java： 
package com.iwanghang.popupwindow;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private EditText et_input;

    /**
     * PopupWindow
     * 一个弹出窗口，可以用来显示一个任意的视图。弹出窗口是一个浮动的容器出现在顶部的当前活动。
     */
    private PopupWindow popupWindow;

    private ListView listView;
    private MyAdapter myAdapter;
    private ArrayList<String> msgs;



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        et_input = (EditText) findViewById(R.id.et_input);

        et_input.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (popupWindow == null){
                    popupWindow = new PopupWindow(MainActivity.this);
                    popupWindow.setWidth(et_input.getWidth());
                    int height = DensityUtil.dip2px(MainActivity.this,200); // dp->px
                    popupWindow.setHeight(height);
                    
                    popupWindow.setContentView(listView);
                    popupWindow.setFocusable(true); // 设置焦点
                }
                
                popupWindow.showAsDropDown(et_input,0,0);
            }
        });


        listView = new ListView(this);
        listView.setBackgroundResource(R.color.colorMy);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                // 1、得到数据
                String msg = msgs.get(i);
                // 2、设置输入框
                et_input.setText(msg);

                if (popupWindow != null && popupWindow.isShowing()) {
                    popupWindow.dismiss();
                    popupWindow = null;
                }
            }
        });


        // 准备数据
        msgs = new ArrayList<>();
        for (int i = 0; i <50 ; i++) {
            msgs.add(i+".iwanghang");
        }
        myAdapter = new MyAdapter();
        listView.setAdapter(myAdapter);
    }

    /**
     * listView的适配器
     */
    class MyAdapter extends BaseAdapter{

        @Override
        public int getCount() {
            return msgs.size();
        }

        @Override
        public Object getItem(int i) {
            return null;
        }

        @Override
        public long getItemId(int i) {
            return 0;
        }

        @Override
        public View getView(int i, View view, ViewGroup viewGroup) {
            ViewHolder viewHolder;
            if (view == null) {
                view = View.inflate(MainActivity.this, R.layout.item_main, null);
                viewHolder = new ViewHolder();
                viewHolder.tv_msg = (TextView) view.findViewById(R.id.tv_msg);
                viewHolder.iv_delete = (ImageView) view.findViewById(R.id.iv_delete);
                view.setTag(viewHolder);
            }else {
                viewHolder = (ViewHolder) view.getTag();
            }

            // 根据位置得到数据
            final String msg = msgs.get(i);
            viewHolder.tv_msg.setText(msg);

            // 设置删除
            viewHolder.iv_delete.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    // 1、从集合删除
                    msgs.remove(msg);
                    // 2、刷新ui 适配器刷新
                    myAdapter.notifyDataSetChanged();
                }
            });

            return view;
        }
    }

    static class ViewHolder{
        TextView tv_msg;
        ImageView iv_delete;
    }

}
DensityUtil.java： 
package com.iwanghang.popupwindow;

import android.content.Context;

public class DensityUtil {
    /**
     * 根据手机的分辨率从 dip 的单位 转成为 px(像素)
     */
    public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

    /**
     * 根据手机的分辨率从 px(像素) 的单位 转成为 dp
     */
    public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }
}
activity_main.xml 
<?xml version="1.0" encoding="utf-8"?>
<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: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.iwanghang.popupwindow.MainActivity">

    <EditText
        android:id="@+id/et_input"
        android:hint="请输入内容..."
        android:ellipsize="middle"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <ImageView
        android:id="@+id/iv_down_arrow"
        android:src="@drawable/down_arrow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignRight="@+id/et_input"
        android:layout_alignEnd="@+id/et_input" />
</RelativeLayout>
item_main.xml 
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="50dp">

    <ImageView
        android:src="@drawable/user"
        android:layout_gravity="center"
        android:gravity="center"
        android:layout_width="30dp"
        android:layout_height="30dp" />

    <TextView
        android:id="@+id/tv_msg"
        android:text="123456"
        android:layout_gravity="center"
        android:gravity="center"
        android:layout_weight="1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <ImageView
        android:id="@+id/iv_delete"
        android:src="@drawable/delete"
        android:layout_gravity="center"
        android:gravity="center"
        android:layout_width="25dp"
        android:layout_height="25dp" />
</LinearLayout>




转载请注明出处： http://blog.csdn.net/iwanghang/article/details/53763364



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项目下载： http://download.csdn.net/detail/iwanghang/9716587
觉得博文有用，请点赞，请留言，请关注，谢谢！~

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