我有一个带有两个图像视图的xml文件,我已将两者的可见性设置为已消失,因此我可以稍后通过java动态更改其可见性。但是当我将它们设置为可见时它们没有显示出来。这是我根据另一个活动发送的意图值将图像设置为可见的代码,
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View temp = inflater.inflate(R.layout.notes_row, container, false);
if (getActivity().getIntent().getStringExtra("category")!=null && getActivity().getIntent().getStringExtra("category").equalsIgnoreCase("important")){
ImageView imageView = (ImageView) temp.findViewById(R.id.icon2);
imageView.setVisibility(View.VISIBLE);
}
else {
ImageView imageView = (ImageView) temp.findViewById(R.id.icon); //draft
imageView.setVisibility(View.VISIBLE);
}
mSimpleCursorAdapter=new SimpleCursorAdapter(getActivity(),R.layout.notes_row,null, from, to,0);
View rootView = inflater.inflate(R.layout.fragment_todo_list, container, false);
getLoaderManager().initLoader(LOADER_ID, null, this); //once this is done onCreateLoader will be called.
final ListView listView = (ListView) rootView.findViewById(R.id.notes_list); //findViewById must be called using the rootView because we are inside a fragment.
text= (TextView) rootView.findViewById(R.id.empty_list);
if(mSimpleCursorAdapter.getCount()==0) {
text.setVisibility(View.VISIBLE);
}
if (getActivity().findViewById (R.id.fragment_container)!=null){
listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);}//end if.
listView.setAdapter(mSimpleCursorAdapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long l) {
Cursor cursor = mSimpleCursorAdapter.getCursor();
if (cursor != null && cursor.moveToPosition(position)) {
String category= cursor.getString(1);
String summary= cursor.getString(2);
String description=cursor.getString(3);
long id= cursor.getLong(cursor.getColumnIndex(NotesContract.NotesTable._ID));
int locationId= cursor.getInt(cursor.getColumnIndex(NotesContract.NotesTable.COLUMN_LOCATION));
String [] retrievedData= {category, summary, description};
if (getActivity().findViewById (R.id.fragment_container)!=null){
//two pane layout:
listView.setItemChecked(position, true);
listView.setBackgroundColor(Color.BLUE);
Bundle args = new Bundle();
args.putStringArray("data",retrievedData);
/*args.putInt("update", 1);*/
args.putLong("id", id);
args.putInt("locationId", locationId);
mCallback.onlistElementClicked(args );/*this is available in the parent activity*/
}
else {
// one pane layout:
Intent intent = new Intent(getActivity(), NotesDetails.class);
intent.putExtra(Intent.EXTRA_TEXT, retrievedData);
/*intent.putExtra("update", 1); */ //to indicate that the query should be update not insert.
intent.putExtra("id", id);
intent.putExtra("locationId", locationId); //whether it is 0 or 1
startActivity(intent);
}
}//end outer cursor if.
}
});
return rootView;
}
这是我试图更改其中图像的布局的xml文件,
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<ImageView
android:id="@+id/icon"
android:layout_width="30dp"
android:layout_height="24dp"
android:layout_marginLeft="4dp"
android:layout_marginRight="8dp"
android:layout_marginTop="8dp"
android:background="@drawable/drafticon"
android:visibility="gone">
</ImageView>
<ImageView
android:id="@+id/icon2"
android:layout_width="30dp"
android:layout_height="24dp"
android:layout_marginLeft="4dp"
android:layout_marginRight="8dp"
android:layout_marginTop="8dp"
android:background="@drawable/staricon"
android:visibility="gone">
</ImageView>
<TextView
android:id="@+id/label"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="6dp"
android:lines="1"
android:text="@+id/TextView01"
android:textSize="24dp"
>
</TextView>
</LinearLayout>
<TextView
android:id="@+id/date"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/> <!--text will be set dynamically -->
</LinearLayout>
可以看出,包含图像视图的布局称为notes_row,我只将它用作SimpleCursorAdapter的参数。
任何人都可以帮帮我吗?我已经尝试了太多方法而且没有任何效果,我已经检查了if语句中的意图并且它不是null。
感谢任何帮助。
谢谢。
答案 0 :(得分:0)
不要将可见度更改为已消失。对图像视图进行以下更改将其更改为不可见而不是消失。在您的XML替换中
android:visibility="gone"
使用
android:visibility="invisible"
尝试替换
android:background="@drawable/staricon"
使用
android:src="@drawable/staricon"
您在水平线性布局中为textView指定匹配父级的宽度。这可能是您的图像视图无法显示的原因。
将文字视图的宽度更改为wrap_content
,而不是match_parent
希望这对你有所帮助。