自定義控件---系統(tǒng)控件組合式(案例三)
來源：程序員人生 發(fā)布時間：2015-03-18 10:25:12 閱讀次數(shù)：3548次
效果圖以下
--------------------------------------------------
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"
tools:context=".MainActivity" >
<EditText
android:id="@+id/editText1"
android:layout_width="200dip"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:hint="請輸入文本"
android:singleLine="true" />
<ImageView
android:id="@+id/iv_down_arrow"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/editText1"
android:layout_alignRight="@+id/editText1"
android:src="@drawable/down_arrow" />
</RelativeLayout>
popupwindow_item.xml
<?xml version="1.0" encoding="utf⑻"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:padding="5dip"
android:src="@drawable/user" />
<TextView
android:id="@+id/tv_msg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="aaaaaaaa0"
android:textColor="#000000"
android:textSize="18sp" />
<ImageView
android:id="@+id/iv_delete"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:padding="10dip"
android:src="@drawable/delete" />
</RelativeLayout>
MainActivity.java
package com.atguigu.downarrow;
import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;
public class MainActivity extends Activity {
private EditText editText1;
private ImageView iv_down_arrow;
private PopupWindow window;
//自定義listView
private ListView listView;
//數(shù)據(jù)
private ArrayList<String> msgs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
editText1 = (EditText) findViewById(R.id.editText1);
iv_down_arrow = (ImageView) findViewById(R.id.iv_down_arrow);
//設置點擊事件-彈出popuwindow
iv_down_arrow.setOnClickListener(mClickListener);
//準備數(shù)據(jù)
msgs = new ArrayList<String>();
for(int i =0;i<200;i++){
msgs.add("aaaaaaaaaaa"+i);
}
//實例化ListView
listView = new ListView(this);
//9Patch圖片
listView.setBackgroundResource(R.drawable.listview_background);
//創(chuàng)建并且設置適配器
MyAdaper adapter = new MyAdaper();
listView.setAdapter(adapter);
//設置點擊某1條
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//1.得到內(nèi)容
String msg = msgs.get(position);
//2.設置到輸入框里面
editText1.setText(msg);
//如果試圖不為空，并且試圖處于顯示狀態(tài)
if(window!= null&&window.isShowing()){
window.dismiss();
//釋放資源
window = null;
}
}
});
}
private OnClickListener mClickListener = new OnClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.iv_down_arrow://向下箭頭
if(window == null){
window = new PopupWindow(MainActivity.this);
window.setWidth(editText1.getWidth());
window.setHeight(200);
//TODO ListView還沒有創(chuàng)建，1會要來繼續(xù)接著這個地方寫代碼
window.setContentView(listView);
//設置焦點
window.setFocusable(true);
}
window.showAsDropDown(editText1, 0, 0);
break;
default:
break;
}
}
};
/**
* 創(chuàng)建適配器
*/
class MyAdaper extends BaseAdapter{
@Override
public int getCount() {
return msgs.size();
}
@Override
public Object getItem(int position) {
return msgs.get(position);
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
//終究返回1個view
View view;
ViewHolder holder;
if(convertView != null){
view = convertView;
holder = (ViewHolder) view.getTag();
}else{
//把布局文件--->View對象
view = View.inflate(MainActivity.this, R.layout.popupwindow_item, null);
holder = new ViewHolder();
holder.tv_msg = (TextView) view.findViewById(R.id.tv_msg);
holder.iv_delete = (ImageView) view.findViewById(R.id.iv_delete);
//關聯(lián)起來
view.setTag(holder);
}
//根據(jù)位置得到對應的數(shù)據(jù)
final String msg = msgs.get(position);
holder.tv_msg.setText(msg);
holder.iv_delete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
//1.從列表中清除
msgs.remove(msg);
//2.刷新顯示
notifyDataSetChanged();
}
});
return view;
}
}
static class ViewHolder{
TextView tv_msg;
ImageView iv_delete;
}
}
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