我尝试构建我的第一个自定义gui元素但是当我稍后在代码中尝试更改外观或适配器(使用Gallery)时出现问题。
我的问题:我无法更改自定义图库属性
我的实际代码:
首先,我创建一个XML,它是widget customGallery.xml
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android">
<ImageButton android:id="@+id/toLeft"
android:background="@drawable/arrow_left"
android:layout_width="wrap_content"
android:layout_height="40dip"
android:layout_marginBottom="1dip" />
<Gallery
android:id="@+id/gallery"
android:layout_width="fill_parent"
android:layout_height="40dip"
android:layout_toRightOf="@+id/toLeft"
android:spacing="40dip"
android:scrollbars="horizontal"/>
<ImageButton android:id="@+id/toRight"
android:background="@drawable/arrow_right"
android:layout_width="wrap_content"
android:layout_height="40dip"
android:layout_toRightOf="@+id/gallery" />
</merge>
稍后我创建了一个test.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/lin_layout"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<com.Test.GallerySlider
android:id="@+id/choose"
android:layout_span="2"
android:layout_width="300dip"
android:layout_height="wrap_content" />
</LinearLayout>
我的下一步是将这个自定义Widget包含到我的项目中,并从我的Widget中更改适配器:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
LinearLayout lineLayout = (LinearLayout) findViewById(R.id.lin_layout);
ViewStub st3 = new ViewStub(TestwidgetActivity.this);
LinearLayout.LayoutParams paramst3 = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT);
lineLayout.addView(st3,paramst3);
st3.setLayoutResource(R.layout.test);
View st3InflaView =st3.inflate();
GallerySlider gSlider= (GallerySlider) st3InflaView.findViewById(R.id.choose);
gSlider.setNewAdapter( new ArrayAdapter<String>(this, android.R.layout.customGallery, new String[] {"1 ","2","3","4"}));
}
这是我写的Widgetclass:
public class GallerySlider extends RelativeLayout implements OnClickListener {
private ArrayAdapter<String> adapter;
private Gallery gallery;
private ImageButton toLeftBtn = null;
private ImageButton toRightbtn = null;
public GallerySlider(Context context) {
super(context, null);
init(context);
}
public GallerySlider(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public GallerySlider(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs);
init(context);
}
public void init(Context ctx){
LayoutInflater inflater = (LayoutInflater) ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE) ;
inflater.inflate(R.layout.customGallery, this, true);
toLeftBtn = (ImageButton) findViewById(R.id.toLeft);
toLeftBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(gallery.getSelectedItemPosition() > 0){
gallery.setSelection(gallery.getSelectedItemPosition()-1);
}
}
});
toRightbtn = (ImageButton) findViewById(R.id.toRight);
toRightbtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(gallery.getSelectedItemPosition() < gallery.getAdapter().getCount()-1){
gallery.setSelection(gallery.getSelectedItemPosition()+1);
}
}
});
adapter = new ArrayAdapter<String>(ctx, android.R.layout.simple_gallery_item, new String[] {"1","1",
"1")});
gallery = (Gallery) findViewById(R.id.gallery);
gallery.setBackgroundResource(R.drawable.h_sliderl);
gallery.setAdapter(adapter);
}
@Override
public void onClick(DialogInterface dialog, int which) {
switch(which){
case R.id.toLeft: gallery.setSelection(gallery.getFocusedChild().getId()-1);
break;
case R.id.toRight: gallery.setSelection(gallery.getFocusedChild().getId()+1);
break;
}
}
public void setNewAdapter(ArrayAdapter<String> _adapter){
gallery.setAdapter(_adapter);
((ArrayAdapter) gallery.getAdapter()).notifyDataSetChanged ();
}
}
如果我调用setNewAdapter(ArrayAdapter _adapter)没有任何改变..我也试图改变画廊的大小但它也失败了(不会发生)。我的方法是假的吗? 问候马塞尔
答案 0 :(得分:0)
我可以检测到的第一件事是您正在创建自定义视图两次。
设置布局时,ViewStub
会首次创建。
第二个,当你膨胀contentView
时,它不会被添加到R.layout.test
。
您正在将适配器设置为第二个自定义视图,该视图未添加到视图层次结构中。