android改变项目的文本颜色在旋转 [英] android change text color of items in spinner
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问题描述
我有一个微调器，在某些条件下，一些选项不应该选择。我有代码，使项目不可选择，但它不灰色文本颜色，以指定该项目是不可选择的。如何更改应禁用的微调项中的项目的文本颜色？下面是代码：
public class main extends Activity {
@Override
public void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.main）;
PatchedSpinner pSpinner =（PatchedSpinner）findViewById（R.id.spinner2）;
ArrayList< String> testarray = new ArrayList< String>（）;
testarray.add（item0）;
testarray.add（item1）;
testarray.add（item2）;
testarray.add（item3）;
ArrayAdapter< String> spinnerAdapter = new ArrayAdapter< String>（this，
android.R.layout.simple_spinner_dropdown_item，testarray）{
@Override
public boolean isEnabled（int position）{
返回位置！= 1;
}
public boolean areAllItemsEnabled（）{
return false;
}
};
pSpinner.setAdapter（spinnerAdapter）;
}
下面是用于创建微调器的自定义微调框微调器中的某些项目。
public class PatchedSpinner extends Spinner {
public PatchedSpinner（Context context，AttributeSet attrs，int defStyle） {
super（context，attrs，defStyle）;
}
public PatchedSpinner（Context context）{
super（context）;
}
public PatchedSpinner（Context context，AttributeSet attrs）{
super（context，attrs）;
}
@Override
public boolean performClick（）{
//此行已删除，我们不想将点击委托给微调器。
// boolean handled = super.performClick（）;
上下文上下文= getContext（）;
final DropDownAdapter adapter = new DropDownAdapter（getAdapter（））;
CharSequence mPrompt = getPrompt（）;
AlertDialog.Builder builder = new AlertDialog.Builder（context）;
if（mPrompt！= null）{
builder.setTitle（mPrompt）;
}
builder.setSingleChoiceItems（adapter，getSelectedItemPosition（），this）.show（）;
return true;
}
private static class DropDownAdapter实现ListAdapter，SpinnerAdapter {
private SpinnerAdapter mAdapter;
public DropDownAdapter（SpinnerAdapter adapter）{
mAdapter = adapter;
}
public int getCount（）{
return mAdapter == null？ 0：mAdapter.getCount（）;
}
public Object getItem（int position）{
return mAdapter == null？ null：mAdapter.getItem（position）;
}
public long getItemId（int position）{
return mAdapter == null？ -1：mAdapter.getItemId（position）;
}
public View getView（int position，View convertView，ViewGroup parent）{
return getDropDownView（position，convertView，parent）;
}
public View getDropDownView（int position，View convertView，ViewGroup parent）{
if（mAdapter == null）{
return null;
}
mAdapter.getDropDownView（position，convertView，parent）;
}
public boolean hasStableIds（）{
return mAdapter！= null&& mAdapter.hasStableIds（）;
}
public void registerDataSetObserver（DataSetObserver observer）{
if（mAdapter！= null）{
mAdapter.registerDataSetObserver（observer）;
}
}
public void unregisterDataSetObserver（DataSetObserver observer）{
if（mAdapter！= null）{
mAdapter.unregisterDataSetObserver（observer）;
}
}
// PATCHED
public boolean areAllItemsEnabled（）{
if（BaseAdapter的mAdapter instance）{
return ）mAdapter）.areAllItemsEnabled（）;
} else {
return true;
}
}
// PATCHED
public boolean isEnabled（int position）{
if（BaseAdapter的mAdapter instance）{
return （BaseAdapter）mAdapter）.isEnabled（position）;
} else {
return true;
}
}
public int getItemViewType（int position）{
return 0;
}
public int getViewTypeCount（）{
return 1;
}
public boolean isEmpty（）{
返回getCount（）== 0;
}
}
}
解决方案>
我想出，为了使这项工作，你必须覆盖getDropDownView当在主活动中设置ArrayAdapter。
public class main extends Activity {
@Override
public void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.main）;
PatchedSpinner pSpinner =（PatchedSpinner）findViewById（R.id.spinner2）;
ArrayList< String> testarray = new ArrayList< String>（）;
testarray.add（item0）;
testarray.add（item1）;
testarray.add（item2）;
testarray.add（item3）;
ArrayAdapter< String> spinnerAdapter = new ArrayAdapter< String>（this，android.R.layout.simple_spinner_dropdown_item，testarray）{
@Override
public boolean isEnabled（int position）{
return position！ = 1;
}
@Override
public boolean areAllItemsEnabled（）{
return false;
}
@Override
public View getDropDownView（int position，View convertView，ViewGroup parent）{
View v = convertView;
if（v == null）{
Context mContext = this.getContext（）;
LayoutInflater vi =（LayoutInflater）mContext.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;
v = vi.inflate（R.layout.row，null）;
}
TextView tv =（TextView）v.findViewById（R.id.spinnerTarget）;
tv.setText（testarray.get（position））;
switch（position）{
case 0：
tv.setTextColor（Color.RED）;
break;
case 1：
tv.setTextColor（Color.BLUE）;
break;
默认值：
tv.setTextColor（Color.BLACK）;
break;
}
return v;
}
};
pSpinner.setAdapter（spinnerAdapter）;
}
正在扩充的布局是一个名为row.xml的自定义布局。它用于设置下拉视图的显示。
<？xml version =1.0encoding =utf- 8→>
< TextView xmlns：android =http://schemas.android.com/apk/res/android
android：id =@ + id / spinnerTarget
android：layout_width =fill_parent
android：layout_height =wrap_content
android：textSize =14pt/>
I have a spinner where in certain conditions some options should not be selectable. I have the code to make items not selectable but it does not grey out text color to specify that the item is not selectable. How would I change the text color of the items in the spinner that should be disabled? Here is the code:
public class main extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
PatchedSpinner pSpinner = (PatchedSpinner) findViewById(R.id.spinner2);
ArrayList<String> testarray = new ArrayList<String>();
testarray.add("item0");
testarray.add("item1");
testarray.add("item2");
testarray.add("item3");
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_dropdown_item, testarray) {
@Override
public boolean isEnabled(int position) {
return position != 1;
}
public boolean areAllItemsEnabled() {
return false;
}
};
pSpinner.setAdapter(spinnerAdapter);
}
Below is the Custom Spinner Class used to create a spinner that is able to disable certain items in the spinner.
public class PatchedSpinner extends Spinner {
public PatchedSpinner(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public PatchedSpinner(Context context) {
super(context);
}
public PatchedSpinner(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public boolean performClick() {
// this line removed, we do not want to delegate the click to the spinner.
// boolean handled = super.performClick();
Context context = getContext();
final DropDownAdapter adapter = new DropDownAdapter(getAdapter());
CharSequence mPrompt = getPrompt();
AlertDialog.Builder builder = new AlertDialog.Builder(context);
if (mPrompt != null) {
builder.setTitle(mPrompt);
}
builder.setSingleChoiceItems(adapter, getSelectedItemPosition(), this).show();
return true;
}
private static class DropDownAdapter implements ListAdapter, SpinnerAdapter {
private SpinnerAdapter mAdapter;
public DropDownAdapter(SpinnerAdapter adapter) {
mAdapter = adapter;
}
public int getCount() {
return mAdapter == null ? 0 : mAdapter.getCount();
}
public Object getItem(int position) {
return mAdapter == null ? null : mAdapter.getItem(position);
}
public long getItemId(int position) {
return mAdapter == null ? -1 : mAdapter.getItemId(position);
}
public View getView(int position, View convertView, ViewGroup parent) {
return getDropDownView(position, convertView, parent);
}
public View getDropDownView(int position, View convertView,ViewGroup parent) {
if (mAdapter == null) {
return null;
}
mAdapter.getDropDownView(position, convertView, parent);
}
public boolean hasStableIds() {
return mAdapter != null && mAdapter.hasStableIds();
}
public void registerDataSetObserver(DataSetObserver observer){
if (mAdapter != null) {
mAdapter.registerDataSetObserver(observer);
}
}
public void unregisterDataSetObserver(DataSetObserver observer) {
if (mAdapter != null) {
mAdapter.unregisterDataSetObserver(observer);
}
}
// PATCHED
public boolean areAllItemsEnabled() {
if (mAdapter instanceof BaseAdapter) {
return ((BaseAdapter) mAdapter).areAllItemsEnabled();
} else {
return true;
}
}
// PATCHED
public boolean isEnabled(int position) {
if (mAdapter instanceof BaseAdapter) {
return ((BaseAdapter) mAdapter).isEnabled(position);
} else {
return true;
}
}
public int getItemViewType(int position) {
return 0;
}
public int getViewTypeCount() {
return 1;
}
public boolean isEmpty() {
return getCount() == 0;
}
}
}
解决方案
I figured out that to make this work you have to override the getDropDownView when setting up the ArrayAdapter in the main activity.
public class main extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
PatchedSpinner pSpinner = (PatchedSpinner) findViewById(R.id.spinner2);
ArrayList<String> testarray = new ArrayList<String>();
testarray.add("item0");
testarray.add("item1");
testarray.add("item2");
testarray.add("item3");
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item, testarray) {
@Override
public boolean isEnabled(int position) {
return position != 1;
}
@Override
public boolean areAllItemsEnabled() {
return false;
}
@Override
public View getDropDownView(int position, View convertView, ViewGroup parent){
View v = convertView;
if (v == null) {
Context mContext = this.getContext();
LayoutInflater vi = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.row, null);
}
TextView tv = (TextView) v.findViewById(R.id.spinnerTarget);
tv.setText(testarray.get(position));
switch (position) {
case 0:
tv.setTextColor(Color.RED);
break;
case 1:
tv.setTextColor(Color.BLUE);
break;
default:
tv.setTextColor(Color.BLACK);
break;
}
return v;
}
};
pSpinner.setAdapter(spinnerAdapter);
}
The layout that is being inflated is a custom layout called row.xml. it is used to set the display for the dropdown view.
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/spinnerTarget"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="14pt" />
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