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当我打开某个扩展ArrayAdapter的类时,出现了一些奇怪的情况,当我转到另一个屏幕时,点击后退按钮。我为某些值设置了膨胀的xml文件的背景应该设置为灰色(200,200,200)。但是当我现在点击后退按钮时,所有东西都是灰色的,尽管当我通过主屏幕(并且没有按下后退按钮...)时它显示效果很好。类看起来像这样:按下按钮后不会正常
代码覆盖getView方法:
@Override
public View getView(int position, View v, ViewGroup parent) {
View mView = v;
if (mView == null) {
LayoutInflater vi = (LayoutInflater) getContext().getSystemService(
Context.LAYOUT_INFLATER_SERVICE);
mView = vi.inflate(R.layout.levelselector_item, null);
}
TextView level = (TextView) mView.findViewById(R.id.tvLevel);
TextView levelScore = (TextView) mView.findViewById(R.id.tvLevelScore);
if (mView != null) {
level.setText(Integer.toString(getItem(position).getLevel()));
loadDataBase();
int correctAnswers = myDbHelper.getCorrectAnswers(getItem(position).getLevel());
int correctAnswersPrev = 0;
int correctAnswersPrev = myDbHelper.getCorrectAnswersPrev(getItem(position).getLevel());
String correct = Integer.toString(correctAnswers);
levelScore.setText(correct + "/60");
level.setTypeface(font);
levelScore.setTypeface(font);
if (correctAnswersPrev < 2 && !correct.equals("")){
mView.setBackgroundColor(Color.argb(200, 200, 200, 200));
}
}
return mView;
}
private void loadDataBase() {
// TODO Auto-generated method stub
myDbHelper = new DataBaseHelper(C);
try {
myDbHelper.createDataBase();
} catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
myDbHelper.openDataBase();
} catch (SQLException sqle) {
throw sqle;
}
}
Grtz!
谢谢!它有诀窍。这不奇怪吗?为什么我必须添加一个else语句?如果它的陈述是真实的,那么假设它只能通过... –
在你知道幕后发生了什么之前,这很奇怪。观看Android的Romain Guy讨论[本主题](http://www.google.com/events/io/2009/sessions/TurboChargeUiAndroidFast.html),您会发现一些加速代码的快速提示。很高兴我能帮上忙! – Sam