将字符串列表视图转换为自定义列表视图

Question

我创建了一个列表视图，它显示了 android 设备上当前安装的所有应用程序。该代码还检索了应用程序的图标，但我无法在列表中显示它，因为它只能显示字符串。我如何更改我的代码，以便它在名称旁边也显示应用程序图标？

此外，我还想在每个应用程序标题和图标旁边添加一个复选框

    final ArrayList<String> list = new ArrayList<String>();


    final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
    mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
    final List pkgAppsList = getPackageManager().queryIntentActivities( mainIntent, 0);
    for (Object object : pkgAppsList)
    {
        ResolveInfo info = (ResolveInfo) object;
        Drawable icon    = getBaseContext().getPackageManager().getApplicationIcon(info.activityInfo.applicationInfo);
        String strAppName   = info.activityInfo.applicationInfo.publicSourceDir.toString();
        String strPackageName  = info.activityInfo.applicationInfo.packageName.toString();
        final String title  = (String)((info != null) ? getBaseContext().getPackageManager().getApplicationLabel(info.activityInfo.applicationInfo) : "???");
        list.add(title);
    }

    final ListView listview = (ListView) findViewById(R.id.listView);
    final ArrayAdapter adapter = new ArrayAdapter(this,
            android.R.layout.simple_list_item_1, list);
    listview.setAdapter(adapter);

谢谢

Answer 1

你需要三样东西：

单行布局
a class 存储您的应用程序名称和图标
自定义列表适配器

custom_row_layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="60dp"
android:background="@drawable/nav_item_bg"
android:clickable="true"
android:orientation="horizontal">

<ImageView
    android:id="@+id/icon"
    android:layout_width="30dp"
    android:layout_height="30dp"
    android:layout_gravity="center_vertical"
    android:layout_marginLeft="16dp" />

<TextView
    android:id="@+id/text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerVertical="true"
    android:layout_gravity="center_vertical"
    android:layout_marginLeft="16dp"
    android:textSize="16sp" />

</LinearLayout>

AppDetails.java

public class AppDetails {
    String name;
    Drawable icon;

    public AppDetails(String name, Drawable icon) {
        this.name = name;
        this.icon = icon;
    }
}

AppDetailsAdapter.java

public class AppDetailsAdapter extends BaseAdapter {

private ArrayList<AppDetails> data;
private Context context;

public AppDetailsAdapter(Context context, List<AppDetails> data){
    this.context = context;
    this.data = data;
}

@Override
public int getCount(){
    return data.size();
}

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

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

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

    if(view == null){
        LayoutInflater vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = vi.inflate(R.layout.custom_row_layout, null);
    }

    ImageView icon = (ImageView) view.findViewById(R.id.icon);
    TextView text = (TextView) view.findViewById(R.id.text);

    final AppDetails item = data.get(position);
    text.setText(item.name); 
    icon.setImageDrawable(item.icon);

    return view;
}

要在您的代码中实现这一点，您应该执行如下操作：

List<AppDetails> appList = new ArrayList<>();
for (Object object : pkgAppsList)
{
    //This is your foreach loop over all apps
    //.. Add these 2 line at the end of your loop
    AppDetails tmp = new AppDetails(strAppName, icon);
    appList.add(tmp)
}

而不是使用 exsistig ArrayAdapter 你应该使用我在上面创建的那个：

ListView listview = (ListView) findViewById(R.id.listView);
AppDetailsAdapter adapter = new AppDetailsAdapter(this, appList);
listview.setAdapter(adapter);

将字符串列表视图转换为自定义列表视图

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