今天看了体格Demos,使用Dialog和ListView结合使用。
这个样例让我掌握了自己定义Dialog的使用和自己定义Adapter的使用。
以下是实现的步骤以及代码实现。
DialogListView。
1、自己定义dialog(PickDialog类):设置context,title。
将xml中的布局文件增加到该类中
1.1 PickDialog继承自Dialog。写构造方法初始化context、title、pickDialogListener。
1.2 重写onCreate方法,将布局文件增加到java文件里
1.3 定义public void initListViewData(ArrayList<String> list)方法。设置布局可见。并将适配器增加到布局文件里。
2、定义pickDialogListener接口。创建一下方法:
public void onLeftBtnClick();
public void onRightBtnClick();
public void onListItemClick(int position, String string);
public void onListItemLongClick(int position, String string);
public void onCancel();
2、自己定义ListView适配器(DialogListViewAdapter类):继承自BaseAdapter。覆写当中的方法。
public DialogListViewAdapter(Context context, List<String> list){
this.context=context;
this.list=list;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Holder holder =null;
if(convertView==null){
convertView=LayoutInflater.from(context).inflate(R.layout.blend_dialog_list_item, null);
holder=new Holder();
holder.blend_dialog_list_item_textview=(TextView) convertView.findViewById(R.id.blend_dialog_list_item_textview);
convertView.setTag(holder);
}else{
holder=(Holder) convertView.getTag();
}
holder.blend_dialog_list_item_textview.setText(list.get(position));
return convertView;
}
class Holder{
TextView blend_dialog_list_item_textview;
}
3、在MainActivity中将内容显示出来,new Handler().postDelayed()方法延迟载入listView布局
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" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"> <Button android:id="@+id/start" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="開始"/> </RelativeLayout>
pickdialog.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="match_parent"> <TextView android:id="@+id/dialog_title" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <LinearLayout android:id="@+id/progress_layout" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content"> <ProgressBar android:layout_width="match_parent" android:layout_height="374dp" android:indeterminate="false" /> </LinearLayout> <LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content"> <ListView android:id="@+id/listview_list" android:layout_width="fill_parent" android:layout_height="wrap_content"> </ListView> </LinearLayout> </LinearLayout>
listview_item.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="match_parent"> <TextView android:id="@+id/textview" android:textColor="#000000" android:layout_width="wrap_content" android:layout_height="20dp" /> </LinearLayout>
MainActivity.java
package lzl.edu.com.dialogtest; import android.app.Activity; import android.os.Bundle; import android.os.Handler; import android.view.View; import android.widget.Button; import android.widget.Toast; import java.util.ArrayList; import java.util.List; public class MainActivity extends Activity { Button start; PickDialog pickDialog; List<String> list = new ArrayList<String>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); start = (Button)findViewById(R.id.start); for(int i=0;i<100;i++){ list.add("第"+i+"条数据"); } start.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { pickDialog =new PickDialog(MainActivity.this,"明天的太阳", new PickDialogListener() { @Override public void onLeftBtnClick() { } @Override public void onRightBtnClick() { } @Override public void onListItemClick(int position, String string) { Toast.makeText(MainActivity.this,string,Toast.LENGTH_LONG).show(); } @Override public void onListItemLongClick(int position, String string) { } @Override public void onCancel() { } }); pickDialog.show(); //for test 延迟三秒载入 new Handler().postDelayed(new Runnable() { public void run() { //execute the task pickDialog.initListViewData(list); } }, 3000); } }); } }
PickDialog.java
package lzl.edu.com.dialogtest; import android.app.Dialog; import android.content.Context; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.widget.AdapterView; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.TextView; import java.util.ArrayList; import java.util.List; /** * Created by admin on 2015/8/18. */ public class PickDialog extends Dialog { Context context; String title; TextView dialog_title; LinearLayout progress_layout; ListView listview_list; PickDialogListener pickDialogListener; DialogListView dialogListView; List<String> items = new ArrayList<String>(); public PickDialog(Context context,String title,PickDialogListener pickDialogListener){ super(context); this.context = context; this.title = title; this.pickDialogListener = pickDialogListener; } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //将xml文件里的布局增加到 java文件里 LayoutInflater inflater = LayoutInflater.from(context); LinearLayout layout = (LinearLayout)inflater.inflate(R.layout.pickdialog, null); dialog_title = (TextView)layout.findViewById(R.id.dialog_title); progress_layout = (LinearLayout)layout.findViewById(R.id.progress_layout); listview_list = (ListView)layout.findViewById(R.id.listview_list); //将布局设置到view中。 this.setContentView(layout); } public void initListViewData(List<String> list){ items = list; //将进度条设置不可见 progress_layout.setVisibility(View.GONE); dialog_title.setText(title); listview_list.setVisibility(View.VISIBLE); dialogListView = new DialogListView(context,list); listview_list.setAdapter(dialogListView); //设置每一个元素的 点击事件 listview_list.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<? > parent, View view, int position, long id) { if(pickDialogListener!=null) pickDialogListener.onListItemClick(position,items.get(position)); } }); } }
DialogListView.java
package lzl.edu.com.dialogtest; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.TextView; import java.util.ArrayList; import java.util.List; /** * Created by admin on 2015/8/18. */ public class DialogListView extends BaseAdapter { private Context context; private List<String> list = new ArrayList<String>(); public DialogListView(Context context,List<String> list){ this.context = context; this.list = list; } @Override public int getCount() { return list.size(); } @Override public Object getItem(int position) { return position; } @Override public long getItemId(int position) { return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { //将list_item.xml中的布局载入到listview中 Holder holder = null; if(convertView == null){ holder = new Holder(); convertView = LayoutInflater.from(context).inflate(R.layout.listview_item,null); holder.textview = (TextView)convertView.findViewById(R.id.textview); convertView.setTag(holder); }else{ holder = (Holder)convertView.getTag(); } //设置文本内容 holder.textview.setText(list.get(position)); return convertView; } class Holder{ TextView textview; } }
PickDialogListener.java
package lzl.edu.com.dialogtest; /** * Created by admin on 2015/8/18. */ public interface PickDialogListener { public void onLeftBtnClick(); public void onRightBtnClick(); public void onListItemClick(int position, String string); public void onListItemLongClick(int position, String string); public void onCancel(); }