Android的列表视图 [英] Android listview
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问题描述
任何一个可以帮助我在列表视图中的第一项应该是默认选中
Any one can help me in listview the first item should be selected by default
package com.globalscholar.announcement;
import java.util.ArrayList;
import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.AdapterView.OnItemClickListener;
import com.globalscholar.R;
public class PublishAnnouncement extends ListActivity implements OnClickListener, OnItemClickListener{
private ListView lViewPub;
private String lv_items[] = {"Teachers" , "Students", "Administration"};
RadioButton radioSSP;
RadioButton radioPubAll1;
Button backPub;
Button donePub;
int role = 0;
//venkat
int selectedPublishOption = -1;
AudienceWrapper audienceDetails = null;
ArrayList<Boolean> checkedStates = new ArrayList<Boolean>();
boolean checkedArray[];
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.publishannouncement);
backPub=(Button)findViewById(R.id.buttPubBack);
backPub.setOnClickListener(this);
donePub=(Button)findViewById(R.id.buttPubDone);
donePub.setOnClickListener(this);
radioSSP=(RadioButton)findViewById(R.id.radioPubSSM);
radioSSP.setOnClickListener(this);
radioPubAll1=(RadioButton)findViewById(R.id.radioPubAll);
radioPubAll1.setOnClickListener(this);
radioPubAll1.setChecked(true);
lViewPub = (ListView) findViewById(android.R.id.list);
lViewPub.setOnItemClickListener(this);
// Set option as Multiple Choice. So that user can be able to select more the one option from list
lViewPub.setAdapter(new ArrayAdapter<String>(this,
R.layout.announcementlistviewstyle, lv_items));
lViewPub.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
lViewPub.setVerticalScrollBarEnabled(false);
getListView().setSelection(0);
//venkat
Bundle b = getIntent().getExtras();
checkedStates.add(0, false);
checkedStates.add(1, false);
checkedStates.add(2, false);
if(b!= null){
audienceDetails = (AudienceWrapper) b.getSerializable("audienceDetails");
selectedPublishOption = b.getInt("selectedPublishOption");
// checked = b.getLongArray("selectedPublishOptionsList");
checkedArray =b.getBooleanArray("selectedPublishOptionsList");
if(checkedArray!=null){
Log.d("PA","Bundle Checked Array Size :"+checkedArray.length);
for(int i=0;i<checkedArray.length;i++){
checkedStates.set(i, checkedArray[i]);
Log.w("PA","CheckedStatus index:"+i+"Status"+checkedStates.get(i));
if(checkedStates.get(i))
lViewPub.setItemChecked(i, true);
}
}
Log.d("selected publishoption in PublishAnnouncement--->", selectedPublishOption+"");
if(selectedPublishOption == 0){
radioPubAll1.setChecked(false);
radioSSP.setChecked(true);
lViewPub.setVisibility(BIND_AUTO_CREATE);
//for checking the options
}
}
//venkatend
PublishAnnouncement.this.getListView().setOnItemClickListener(this);
}
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
Log.d("onItemClick position in PublishAnnouncement----->",position+"");
//role value updated in wrong way when u double click on Item
//solved role problem in done button
/* if(position == 0){
role+= 4;
}
else if(position == 1){
role+=8;
}
else if(position == 2){
role+=2;
}else{
role+=14;
}
Log.d("PA","Role :"+role);*/
//venkat for selected publishes
boolean currentlyChecked = checkedStates.get(position);
checkedStates.set(position, !currentlyChecked);
if(checkedArray!=null)
checkedArray[position] = !currentlyChecked;
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.radioPubSSM:
lViewPub.setVisibility(BIND_AUTO_CREATE);
break;
case R.id.buttPubBack:
onKeyDown(KeyEvent.KEYCODE_BACK,
new KeyEvent(KeyEvent.ACTION_DOWN,
KeyEvent.KEYCODE_BACK));
break;
case R.id.buttPubDone:
//venkat
int allSelect = 0;
int sppCount=0;
//venkatend
Intent newPubDone= new Intent(PublishAnnouncement.this,Audience.class);
Bundle b = new Bundle();
if(radioPubAll1.isChecked()){
role = 14;
//venkat
allSelect = 1;
}else if(radioSSP.isChecked()){
int len = checkedStates.size();
if(checkedArray == null)
checkedArray = new boolean [len];
for(int i=0;i<len;i++){
checkedArray[i] = checkedStates.get(i);
if(checkedStates.get(i)==true){
sppCount++;
}
}
Log.d("PA","Count :"+sppCount);
}
if(sppCount==0 && radioSSP.isChecked()){
AlertDialog.Builder alertBox = new AlertDialog.Builder(this);
alertBox.setMessage("Please select Specific Memebers");
alertBox.setNeutralButton("Ok", null);
alertBox.show();
}else{
b.putInt("SelectedPublishOption", allSelect);
int finalRole = 0;
if(allSelect== 0){
// b.putLongArray("SelectedPublishOptionsList", checked);
b.putBooleanArray("SelectedPublishOptionsList", checkedArray);
if(checkedArray!=null){
if(checkedArray[0]){
finalRole+=4;
}
if(checkedArray[1]){
finalRole+=8;
}
if(checkedArray[2]){
finalRole+=2;
}
}
Log.d("PA","After selecting final Role Value :"+finalRole);
if(audienceDetails!=null)
audienceDetails.setRoleValue(finalRole);
}
b.putInt("role", finalRole);
//venkatend
newPubDone.putExtras(b);
setResult(RESULT_OK, newPubDone);
System.out.println("Role value is" + role);
finish();
}
break;
case R.id.radioPubAll:
lViewPub.setVisibility(-1);
//venkat testing logic
if(checkedArray!=null){
int len= checkedArray.length;
if(len > 0){
for(int i=0;i<len;i++){
lViewPub.setItemChecked(i, false);
System.out.println("all selected Position selected "+checkedArray[i]);
}
}
}
break;
default:
break;
}
}
}
感谢
推荐答案
您是否尝试过使用：
ListView lv = getListView();
lv.setFocusable(true);
lv.setFocusableInTouchMode(true);
lv.setSelection(0);
这篇关于Android的列表视图的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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