Question

我希望用户能够从列表中选择多个应用。我使用Drawables和CheckedTextViews将自定义布局用于已安装应用的列表及其图标。我创建了一个从ArrayAdapter扩展的类来获取图标。

主要的问题是，当我点击列表中的某个应用程序时，CheckedTextView不会改变它的drawable，但它确实将CheckedTextView设置为已选中，因此功能仍然有效，但如果你看不到哪个功能它不是很有用检查。我还是Android新手，但我认为问题出在我的数组适配器上。

ListActivity：

public class FilterListActivity extends ListActivity {
private AppArrayAdapter adapt;
private ArrayList<String> oldChecked =new ArrayList<String>();
private ArrayMap<String, ApplicationInfo> availableApps;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.filter_list);

    getListView().setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    availableApps=getAvailableApps();

    ArrayList<String> appArray=new ArrayList<String>(availableApps.keySet());
    Collections.sort(appArray);
    adapt = new AppArrayAdapter( this, android.R.layout.simple_list_item_checked, appArray);
    setListAdapter(adapt);
    try{
        //check for previous settings
        BufferedInputStream buf = new BufferedInputStream(openFileInput("priorityList.txt"));
        Scanner scan = new Scanner(buf).useDelimiter(",|\\n");
        while (scan.hasNext()){
            String appLabel = scan.next();
            String packageName = scan.next();
            int pos = Integer.parseInt(scan.next());
            oldChecked.add(appLabel);
            //set item as checked
            int i = adapt.getPosition(appLabel);
            if (i>=0){
                CheckedTextView textView = (CheckedTextView)adapt.getView(i, getCurrentFocus(), getListView()).findViewById(R.id.app_names);
                if (textView.getText().toString().equals(appLabel)){
                    this.getListView().setItemChecked(i, true);
                    textView.setChecked(true);


                }
            }
        }
    }catch(FileNotFoundException e){
        //do nothing, list must be created
    }
    adapt.notifyDataSetChanged();

}

@Override
protected void onListItemClick( ListView l, View v, int position, long id)
{
    CheckedTextView textView = (CheckedTextView)v.findViewById(R.id.app_names);

    textView.toggle();
    adapt.notifyDataSetChanged();

}

XML：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".AppView" >

<ImageView
    android:id="@+id/icon"
    android:contentDescription="icon"
    android:layout_width="50dp"
    android:layout_height="50dp"
    android:layout_marginLeft="5dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="5dp"
    android:src="@drawable/ic_launcher" />

<CheckedTextView
    android:id="@+id/app_names"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBottom="@+id/icon"
    android:layout_alignParentRight="true"
    android:layout_marginRight="11dp"
    android:layout_toRightOf="@+id/icon"
    android:checkMark="?android:attr/textCheckMark"
    android:text="@string/app_name" />

</RelativeLayout>

阵列适配器：

package edit.rit.ce.whud;

import java.util.List;

import android.widget.ArrayAdapter;
import android.content.Context;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.support.v4.util.ArrayMap;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CheckedTextView;
import android.widget.ImageView;

public class AppArrayAdapter extends ArrayAdapter<String> {
private final Context context;
private final List<String> objects;
private ArrayMap<String, ApplicationInfo> availableApps;

public AppArrayAdapter(Context context, int resource, List<String> objects)
{
    super(context, resource, objects);
    this.context = context;
    //this.values = values;
    this.objects=objects;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    final PackageManager pm = this.getContext().getPackageManager();
    LayoutInflater inflater = (LayoutInflater) context
        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

    View rowView = inflater.inflate(R.layout.appview, parent, false);
    CheckedTextView textView = (CheckedTextView) rowView.findViewById(R.id.app_names);
    ImageView imageView = (ImageView) rowView.findViewById(R.id.icon);
    textView.setText(objects.get(position));

    // Change icon based on name
    String applabel = objects.get(position);
    availableApps=getAvailableApps();

    Drawable draw= pm.getApplicationIcon(availableApps.get(applabel));
    imageView.setImageDrawable(draw);

    return rowView;

}



private ArrayMap<String, ApplicationInfo> getAvailableApps(){
    ArrayMap<String, ApplicationInfo> availableApps= new ArrayMap<String, ApplicationInfo>();
    final PackageManager pm = this.getContext().getPackageManager();
    List<ApplicationInfo> apps = pm.getInstalledApplications(PackageManager.GET_META_DATA);
    for(ApplicationInfo app:  apps){
        if (app.enabled && (app.flags & ApplicationInfo.FLAG_TEST_ONLY)==0){
            availableApps.put((String)pm.getApplicationLabel(app), app);
        }
    }
    return availableApps;

}

}

CheckedTextView不会改变drawable

0 个答案: