[英]ListView rows with different layouts
我試圖實現的是每行具有不同的布局。 我的ArrayAdapter
的代碼如下:
@Override
public int getCount() {
return contentList.size();
}
@Override
public MyContents getItem(int position) {
return content.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getViewTypeCount() {
// TODO Auto-generated method stub
return 2;
}
@Override
public int getItemViewType(int position) {
// TODO Auto-generated method stub
return super.getItemViewType(position);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final MyContents entry = content.get(position);
View row = convertView;
LayoutInflater inflater = null;
boolean _haschild_ = entry.testBoolean();
if (row == null) {
if (entry.testBoolean()) {
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater
.inflate(R.layout.contents_layout, null);
} else {
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.test_layout, null);
}
}
if (entry.testBoolean()) {
TextView txtView = (TextView) row
.findViewById(R.id.txtView);
//.....
} else {
((TextView) row.findViewById(R.id.txtView_test)) //**LOE**
.setText("test: " + position); //**LOE**
}
return row;
}
* test_layout.xml *的布局文件:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/layout_test"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="12dp"
android:background="@color/grey_five"
android:orientation="vertical"
android:padding="@dimen/padding_small" >
<TextView
android:id="@+id/txtView_test"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:text="@string/lorem__ipsum"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="@color/grey" />
</RelativeLayout>
但是無論何時執行,它都會引發NullPointerException
(檢查帶有注釋的行// LOE )。
有什么建議怎么辦? 在過去的一天里,我一直在努力。
發生NullPointerException
原因是您沒有實現getItemViewType
。 現在,無論哪種情況,您都將返回第一種行布局,這是一種沒有* txtView_test * TextView
的布局。 您的代碼應如下所示:
// some fields
public static final int FIRST_TYPE = 0;
public static final int SECOND_TYPE = 1;
@Override
public int getItemViewType(int position) {
MyContents item = getItem(position);
if (item.testBoolean()) {
return FIRST_TYPE;
} else {
return SECOND_TYPE;
}
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final MyContents entry = content.get(position);
View row = convertView;
LayoutInflater inflater = null;
int type = getItemViewType(position);
boolean _haschild_ = entry.testBoolean();
if (row == null) {
if (type == FIRST_TYPE) {
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater
.inflate(R.layout.contents_layout, null);
} else {
inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
row = inflater.inflate(R.layout.test_layout, null);
}
}
if (type == FIRST_TYPE) {
TextView txtView = (TextView) row
.findViewById(R.id.txtView);
//.....
} else {
((TextView) row.findViewById(R.id.txtView_test)) //**LOE**
.setText("test: " + position); //**LOE**
}
采用,
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row = inflater.inflate(R.layout.test_layout, parent, false);
願它解決您的問題。
嘗試這個 :::
convertView = getLayoutInflater().inflate(R.layout.my_row_layout, null);
TextView txtName = (TextView)convertView.findViewById(R.id.txtMyTextView);
txtName.setText("Hi,,,,. Hows You...");
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