java - 如何在 RecyclerView 中显示已安装的应用程序？

Question

我在 Google 上进行了搜索，但没有找到任何与此相关的内容。

我正在使用 Android Studio 创建我的第一个 Material 应用程序。现在我想在 RecyclerView 中显示手机上安装的所有应用程序。这可能吗？

Answer 1

保存包裹信息的模型:

class PInfo {
    private String appname = "";
    private String pname = "";
    private String versionName = "";
    private int versionCode = 0;
    private Drawable icon;
    public getAppName(){
       return appname;
       }
    }

CustomAdapter 设置应用程序名称的值，还可以通过添加额外的代码来显示图标等。通过调用 getInstalledApps 将返回 PInfo 类对象，您可以使用该对象获取包信息。它需要一个参数，如果你想获取系统应用程序，则传递 true，否则发送 false(代码引用此 site )

public class CustomAdapter extends RecyclerView.Adapter<CustomAdapter.Viewhold> {
ArrayList<PInfo> appn;
    public CustomAdapter() {
       appn=p.getInstalledApps(true);
    }

    @Override
    public int getItemCount() {

          return appn.size();
    }

    @Override
    public void onBindViewHolder(Viewhold holder, int pos) {
      for(int i=0;i<appn.size();i++{
          holder.appname.setText(appn.get(i).pname);
       }
   }

   @Override
   public ContactViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
        View itemView = LayoutInflater.
                    from(viewGroup.getContext()).
                    inflate(R.layout.yourlayout, viewGroup, false);
        return new ContactViewHolder(itemView);
   }


private ArrayList<PInfo> getPackages() {
        ArrayList<PInfo> apps = getInstalledApps(false); /* false = no system packages */
        final int max = apps.size();
        for (int i=0; i<max; i++) {
            apps.get(i).prettyPrint();
        }
        return apps;
    }

private ArrayList<PInfo> getInstalledApps(boolean getSysPackages) {
    ArrayList<PInfo> res = new ArrayList<PInfo>();        
    List<PackageInfo> packs = getPackageManager().getInstalledPackages(0);
    for(int i=0;i<packs.size();i++) {
        PackageInfo p = packs.get(i);
        if ((!getSysPackages) && (p.versionName == null)) {
            continue ;
        }
        PInfo newInfo = new PInfo();
        newInfo.appname = p.applicationInfo.loadLabel(getPackageManager()).toString();
        newInfo.pname = p.packageName;
        newInfo.versionName = p.versionName;
        newInfo.versionCode = p.versionCode;
        newInfo.icon = p.applicationInfo.loadIcon(getPackageManager());
        res.add(newInfo);
    }
    return res; 
}
  public static class ContactViewHolder extends RecyclerView.ViewHolder{
        TextView appname;
        public ViewHolder(View v) {
        super(v);
        appname = (TextView) v.findViewById(R.id.appname);
    }
   }
}

yourlayout.xml

<TextView
    android:id="@+id/secondLine"
    android:layout_width="fill_parent"
    android:layout_height="26dip"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:layout_toRightOf="@id/icon"
    android:ellipsize="marquee"
    android:singleLine="true"
    android:text="Description"
    android:textSize="12sp" />

只需在您的 mainactivity 中调用适配器，如下所示:

    mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
    mLayoutManager = new LinearLayoutManager(this);
    mRecyclerView.setLayoutManager(mLayoutManager);
    mAdapter = new CustomAdapter();
    mRecyclerView.setAdapter(mAdapter);

访问该网站了解 Recyclerview http://www.vogella.com/tutorials/AndroidRecyclerView/article.html