ListView 不是焦点？

Question

我在LinearLayout 中有一个ListView，它不是“焦点”，它有点变灰，但功能齐全，如果我点击一个项目，它是可选择的，但一切都保持相同的浅灰色。我怎样才能改变它，使它成为“焦点”（或者不管这个词是什么？）

布局的xml文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >            

            <Button
                android:id="@+id/saveButton"
                android:layout_width="wrap_content"
                android:layout_height="75dp"
                android:text="Save" />

            <Button
                android:id="@+id/cancelButton"
                android:layout_width="wrap_content"
                android:layout_height="75dp"
                android:text="Cancel" />

            <Spinner
                android:id="@+id/assemblersSpinners"
                android:layout_width="0dip"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

        </LinearLayout>

        <Spinner
                android:id="@+id/assembliesSpinner"
                android:layout_width="wrap_content"
                android:layout_height="0dip"
                android:layout_weight="1" />


    </LinearLayout>

<ListView
        android:id="@+id/assemblyPartsListView"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

关于创建代码

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.view_premade_assembly);

    //lv = (ListView) findViewById(R.id.assemblyPartsListView);
    //lv.setAdapter(new CustomPLNViewAdapter(this, partLotNumberList, partNames));
    lv = (ListView) findViewById(R.id.assemblyPartsListView);
    if(!lv.hasFocus()){
        lv.setFocusable(true);
    }

列表视图的自定义适配器

public class CustomCreateAssemblyViewAdapter extends BaseAdapter{

private static ArrayList<ArrayList<String>> partLotNumbersArrayList;
private static ArrayList<String> partNames;
private static String selected;
private LayoutInflater mInflater;

private Context myContext;

public CustomCreateAssemblyViewAdapter(Context context, ArrayList<ArrayList<String>> results, ArrayList<String> parts){
    partLotNumbersArrayList = results;
    partNames = parts;
    mInflater = LayoutInflater.from(context);
    myContext = context;
}
@Override
public int getCount() {
    return partLotNumbersArrayList.size();
}

@Override
public Object getItem(int position) {
    return partLotNumbersArrayList.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {

    final ViewHolder holder;
    if (convertView == null) {
        convertView = mInflater.inflate(R.layout.view_assembly_parts, null);
        holder = new ViewHolder();
        holder.txtName = (TextView) convertView.findViewById(R.id.partName);
        holder.spinner = (Spinner) convertView.findViewById(R.id.LotNumbers);
        convertView.setTag(holder);         
    } else {
        holder = (ViewHolder) convertView.getTag();
    }

    holder.txtName.setText(partNames.get(position));        

    ArrayAdapter<String> adp1=new ArrayAdapter<String>(myContext, android.R.layout.simple_list_item_1, partLotNumbersArrayList.get(position));          
    adp1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    //set the adapter to the spinnner
    holder.spinner.setAdapter(adp1);        

    //if there is only one other part besides "" then set that as default part
    if(partLotNumbersArrayList.get(position).size() == 2){
        holder.spinner.setSelection(1);
    }   

    holder.spinner.setOnItemSelectedListener(new OnItemSelectedListener(){

        @Override
        public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {


        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {
            // TODO Auto-generated method stub
            ///ViewOrderlineAssemblyActivity.assembly.addPart(new Part((String)holder.txtName.getText(), ""));
            //Log.v("OnNothingSelected", (String)holder.txtName.getText());
        }

    });

    return convertView;
}

static class ViewHolder {
    TextView txtName;
    Spinner spinner;
}

在这个类中设置了适配器

class LoadAssemblyParts extends AsyncTask<String, String, String> {

    /**
     * Before starting background thread Show Progress Dialog
     * */
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(CreateAssemblyActivity.this);
        pDialog.setMessage("Loading assembly parts. Please wait...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(false);
        pDialog.show();
    }

    /**
     * getting All orders from url
     * */
    protected String doInBackground(String... args) {           
        partLotNumberList = dbUtils.getAllAssemblyParts(assemblyName);
        partNames = dbUtils.getAllAssemblyPartNames(assemblyName);
        return null;
    }

    /**
     * After completing background task Dismiss the progress dialog
     * **/
    protected void onPostExecute(String file_url) {
        // dismiss the dialog after getting all orders
        pDialog.dismiss();  

        lv.setAdapter(new CustomCreateAssemblyViewAdapter(getApplicationContext(), partLotNumberList, partNames));
        lv.requestFocus();
    }       
}

Answer 1

你需要listview的id

在创建时

ListView lv = (ListView) findViewById(R.id.your listview id here)

然后你这样做......

if(!lv.hasFocus()){
            lv.setFocusable(true);
            lv.requestFocus();
          }

Answer 2

好吧，事实证明这与焦点无关，而只是 android 喜欢将事物布置得怪异的事实。我不得不更改适配器来设置文本颜色。这是解决方案。

ArrayAdapter<String> adp1=new ArrayAdapter<String>(myContext, android.R.layout.simple_list_item_1, partLotNumbersArrayList.get(position)){
            @Override
            public View getDropDownView(int position, View convertView,android.view.ViewGroup parent){
                View v = convertView;
                View view = super.getView(position, convertView, parent);               
                TextView text = (TextView) view.findViewById(android.R.id.text1);
                text.setTextColor(Color.BLACK);
                text.setBackgroundColor(Color.WHITE);
                return view;
            }
        };