我创建了一个带有从数据库填充的列表适配器的报价应用程序。它有一个加载更多按钮，15个阈值阈值。它没有显示报价大小是否低于15，但它显示列表是否为15，当我们按下加载更多按钮时它会崩溃。
final Button btnLoadMore=new Button(this);
btnLoadMore.setBackgroundColor(Color.parseColor("#351802"));
btnLoadMore.setTextColor(Color.parseColor("#e8d8a7"));
btnLoadMore.setTypeface(btnLoadMore.getTypeface(), Typeface.BOLD);
btnLoadMore.setText("Load More Status");
if(c.getCount()<15){
}
else{
list.addFooterView(btnLoadMore);}
list.setAdapter(adapter);
anifadein=AnimationUtils.loadAnimation(getApplicationContext(), R.anim.slidedown);
list.startAnimation(anifadein);
// Click event for single list row
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
map = quotesList.get(position);
Intent intent = new Intent(QuotesActivity.this,
QuoteDialogActivity.class);
int itemPosition = position;
if(startingPoint>=30){
intent.putExtra("Pos", itemPosition+1);
intent.putExtra("LstCount", list.getCount()-1);
}else{
intent.putExtra("Pos", itemPosition+1);
intent.putExtra("LstCount", list.getCount());}
intent.putExtra("QuoteId", map.get(KEY_ID));
intent.putExtra("quotesType", quType);
intent.putExtra("startFrom", getIntent().getStringExtra("startFrom"));
intent.putExtra("Quotes", quotesList);
// Log.i("COUNT",""+(itemPosition+1)+"-"+list.getCount());
intent.putExtra("Fav", map.get(KEY_FAVORITE));
startActivity(intent);
if (mInterstitial.isLoaded()) {
mInterstitial.show();
}
}
});
btnLoadMore.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
if(btnLoadMore.getVisibility()==View.VISIBLE){
Cursor newC = null;
if (quType != 0) {
switch (quType) {
case 1:
newC = db.getQuotes(""+startingPoint);
break;
case 2:
newC = db.getFavoriteQuotes(""+startingPoint);
//page.setVisibility(View.GONE);
break;
case 3:
newC = db.getAuthorQuotes(getIntent().getStringExtra("AuthorId"),""+startingPoint);
// page.setVisibility(View.GONE);
break;
}
}
// Starting a new async task
if(newC.getCount()<15){
btnLoadMore.setVisibility(View.INVISIBLE);
}
startingPoint+=15;
do{
map = new HashMap<String, String>();
// adding each child node to HashMap key => value
map.put(KEY_ID, newC.getString(newC.getColumnIndex(KEY_ID)));
map.put(KEY_TEXT, newC.getString(newC.getColumnIndex(KEY_TEXT)));
map.put(KEY_AUTHOR, newC.getString(newC.getColumnIndex(KEY_AUTHOR)));
map.put(KEY_PICTURE, newC.getString(newC.getColumnIndex(KEY_PICTURE)));
map.put(KEY_PICTURE_SDCARD, String.valueOf(newC.getInt(newC
.getColumnIndex(KEY_PICTURE_SDCARD))));
map.put(KEY_WEB_ID,
String.valueOf(newC.getInt(newC.getColumnIndex(KEY_WEB_ID))));
//Log.i("web_id",String.valueOf(newC.getInt(newC.getColumnIndex(KEY_ID))));
map.put(KEY_FAVORITE, newC.getString(newC.getColumnIndex(KEY_FAVORITE)));
// adding HashList to ArrayList
quotesList.add(map);
if (mInterstitial.isLoaded()) {
mInterstitial.show();
}
} while (newC.moveToNext());
adapter.notifyDataSetChanged(); }}
});
}
}
Log Cat在这里
02-29 16:39:50.553: E/AndroidRuntime(22325): FATAL EXCEPTION: main
02-29 16:39:50.553: E/AndroidRuntime(22325): Process: com.karopass.hindi_suvichar, PID: 22325
02-29 16:39:50.553: E/AndroidRuntime(22325): android.database.CursorIndexOutOfBoundsException: Index 0 requested, with a size of 0
02-29 16:39:50.553: E/AndroidRuntime(22325): at android.database.AbstractCursor.checkPosition(AbstractCursor.java:426)
02-29 16:39:50.553: E/AndroidRuntime(22325): at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:136)
02-29 16:39:50.553: E/AndroidRuntime(22325): at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:50)
02-29 16:39:50.553: E/AndroidRuntime(22325): at com.karopass.hindi_suvichar.QuotesActivity$2.onClick(QuotesActivity.java:242)
02-29 16:39:50.553: E/AndroidRuntime(22325): at android.view.View.performClick(View.java:5076)
02-29 16:39:50.553: E/AndroidRuntime(22325): at android.view.View$PerformClick.run(View.java:20279)
02-29 16:39:50.553: E/AndroidRuntime(22325): at android.os.Handler.handleCallback(Handler.java:739)
02-29 16:39:50.553: E/AndroidRuntime(22325): at android.os.Handler.dispatchMessage(Handler.java:95)
02-29 16:39:50.553: E/AndroidRuntime(22325): at android.os.Looper.loop(Looper.java:135)
02-29 16:39:50.553: E/AndroidRuntime(22325): at android.app.ActivityThread.main(ActivityThread.java:5930)
02-29 16:39:50.553: E/AndroidRuntime(22325): at java.lang.reflect.Method.invoke(Native Method)
02-29 16:39:50.553: E/AndroidRuntime(22325): at java.lang.reflect.Method.invoke(Method.java:372)
02-29 16:39:50.553: E/AndroidRuntime(22325): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
02-29 16:39:50.553: E/AndroidRuntime(22325): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)
由于
答案 0 :(得分：0)
<=表示小于或等于if(c.getCount()<=15){
或者你可以做（没有else子句）。
if(c.getCount() > 15( {
btnLoadMore.setVisibility(View.VISIBLE);
........ your code that is currently in the else clause..
} else {
btnLoadMore.setVisibility(View.INVISIBLE)
}
请注意！ View.GONE是View.INVISIBLE的替代品。不同之处在于，INVISIBLE只能使视图（按钮）无法看到，而GONE在视图（按钮）不存在的情况下使用它。