我想开发一个简单的android页面，其代码如下所示
>>> lableArray=['l1','l2','l3']
>>> dataArray=['d1','d2','d3']
>>> rdd2=sc.parallelize(lableArray)
>>> rdd1=sc.parallelize(dataArray)
>>> rdd1.collect()
['d1', 'd2', 'd3']
>>> rdd2.collect()
['l1', 'l2', 'l3']
>>> rdd=rdd2.zipWithIndex().map(lambda x:(x[1],x[0])).join(rdd1.zipWithIndex().map(lambda y:(y[1],y[0]))).map(lambda x:x[1])
>>> rdd.collect()
[('l1', 'd1'), ('l2', 'd2'), ('l3', 'd3')]
我的java代码如下。
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<RelativeLayout
android:id="@+id/ll1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_weight="3"
android:background="#2196F3">
</RelativeLayout>
<LinearLayout
android:id="@+id/ll3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:orientation="vertical">
<ListView
android:id="@+id/item_list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1"
android:background="#ffffffff">
</ListView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="70dp"
android:orientation="horizontal"
android:gravity="center_horizontal"
android:background="#2196F3">
<Button
style="?android:attr/buttonStyleSmall"
android:id ="@+id/addItem"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:text="Add Item"
android:layout_marginTop="10dp"
android:background="@layout/button_rounded"
android:textColor="#ffffffff"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
当我点击添加项目按钮时，我想要一个单选按钮的警告对话框出现。单选按钮列表将从import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
final Context context = this;
private ListView lv;
private Button b;
ArrayList<String> items_list = new ArrayList<String>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b = (Button)findViewById(R.id.addItem);
b.setOnClickListener(this);
lv = (ListView)findViewById(R.id.item_list);
lv.setAdapter(new VersionAdapter(this));
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String[] items = {"Pen","Book","File","Note"};
if (v.getId() == R.id.addItem) {
//
}
}
class VersionAdapter extends BaseAdapter {
private LayoutInflater layoutInflater;
public VersionAdapter(MainActivity activity) {
layoutInflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return items_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)
{
View listItem = convertView;
int pos = position;
TextView tv = (TextView) listItem.findViewById(R.id.item_element);
if(!items_list.isEmpty()) {
tv.setText(items_list.get(pos));
}
return listItem;
}
}
}
数组中填充。当我选择一个项目并点击items时，它应该会添加到屏幕上显示的列表视图ok（id - lv）。
答案 0 :(得分：4)
显示对话框的代码
private void showAlertWithRadioButtons(){
AlertDialog.Builder builder = new AlertDialog.Builder(ShowDialog.this);//ERROR ShowDialog cannot be resolved to a type
builder.setTitle("Alert Dialog with ListView and Radio button");
builder.setSingleChoiceItems(items, -1,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int item) {
// Toast.makeText(getApplicationContext(), items[item],
Toast.LENGTH_SHORT).show();
}
});
}
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
ListView lw = ((AlertDialog)dialog).getListView();
Object checkedItem = lw.getAdapter().getItem(lw.getCheckedItemPosition());
itemsList.add(String.valueOf(checkedItem));
adapter.notifyDataSetChanged();
}
});}
使用listview将适配器设置为：
List<String> itemsList = Arrays.asList(items);
// create ArrayAdapter with this exact parameters, not unique because of your app
ArrayAdapter<String> adapter = new VersionAdapter(this, itemsList);
lv.setAdapter(adapter);
经过一些修改后，这是你的适配器
class VersionAdapter extends ArrayAdapter<String> {
private List<String> listItems;
private LayoutInflater layoutInflater;
public VersionAdapter(Activity activity, List<String> listItems) {
super(activity, 0, listItems);
layoutInflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.listItems = listItems;
}
@Override
public int getCount() {
return listItems.size();
}
@Override
public int getItemViewType(int position) {
return super.getItemViewType(position);
}
@Override
public View getView(int position, View convertView, ViewGroup parent)
{
String item = listItems.get(position);
final ViewHolder holder;
if (convertView == null)
{
convertView = layoutInflater.inflate(R.layout.list_item, parent, false);
holder = new ViewHolder();
holder.itemElement = (TextView) convertView.findViewById(R.id.item_element);
convertView.setTag(holder);
}
else
{
holder = (ViewHolder) convertView.getTag();
((ViewHolder) convertView.getTag()).itemElement.setTag(item);
}
if(!item.isEmpty()) {
holder.itemElement.setText(item);
}
return convertView;
}
static class ViewHolder {
TextView itemElement;
}
}
答案 1 :(得分：1)
try this,
set adapter with List;
VersionAdapter versionAdapter = new VersionAdapter(this),items_list
lv.setAdapter(versionAdapter);
Add this Adapter:
class VersionAdapter extends BaseAdapter {
private LayoutInflater layoutInflater;
private ArrayList<String> items_list
public VersionAdapter(MainActivity activity,ArrayList<String> items_list) {
layoutInflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
this.items_list=items_list;
}
@Override
public int getCount() {
return items_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)
{
ViewHolder viewHolder = null;
if(convertView==null){
viewHolder = new ViewHolder();
viewHolder.tv = (TextView) listItem.findViewById(R.id.item_element);
convertView.setTag(viewHolder);
}else{
viewHolder = (ViewHolder) convertView.getTag();
}
if(!items_list.get(position).isEmpty()) {
viewHolder.tv.setText(items_list.get(pos));
}
return convertView;
}
public void addItem(String text){
items_list.add(text);
notifyDataSetChanged()
}
}
}
and On Click Call Add Method Of Adapter:
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String[] items = {"Pen","Book","File","Note"};
if (v.getId() == R.id.addItem) {
versionAdapter.addItem(radioBtnText);
}
}