java - 将大量值推送到 android 中的 firebase

Question

我想存储手机中已安装的应用程序详细信息(名称、包名称、图标)列表，我已经使用适配器在 ListView 中显示了已安装应用程序的列表。但无法将数据列表推送到 Firebase 中。任何人都可以告诉我如何从 firebase 推送和检索数据列表。

这是显示移动设备中安装的列表应用程序的代码

MainActivity.java

public class MainActivity extends AppCompatActivity {
ListView apkList;
FirebaseDatabase mFirebaseDatabase;
DatabaseReference mFireBaseReference;

ArrayList<AppLIst> arrayList;

private ArrayList<String> _listActivitiesHidden = new ArrayList();
private ArrayList<AppLIst> _listActivitiesAll = new ArrayList();
private ArrayList<AppLIst> _customApp = new ArrayList();
private String appId;

PackageManager packageManager;
AppAdapter myAdapter;

private static  String userId;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
  mFirebaseDatabase=FirebaseDatabase.getInstance();
  mFireBaseReference=mFirebaseDatabase.getReference("apps");
    packageManager = getPackageManager();
    List<PackageInfo> packageList = packageManager
            .getInstalledPackages(PackageManager.GET_PERMISSIONS);

    List<PackageInfo> packageList1 = new ArrayList<PackageInfo>();

    /*To filter out System apps*/
    for(PackageInfo pi : packageList) {
        boolean b = isSystemPackage(pi);
        if(!b) {
            packageList1.add(pi);
        }
    }
    apkList = (ListView) findViewById(R.id.idListView);
     myAdapter = new AppAdapter(this,packageList,packageManager);
    apkList.setAdapter(myAdapter);

  //  apkList.setOnItemClickListener(this);
}

private boolean isSystemPackage(PackageInfo pkgInfo) {
    return ((pkgInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0) ? true
            : false;
}

我不知道将此数据列表存储到 firebase 中。任何帮助表示赞赏。

Answer 1

来自文档:

public Task<Void> setValue (Object value)

Set the data at this location to the given value. Passing null to setValue() will delete the data at the specified location. The native types accepted by this method for the value corresponding to the JSON types:

Boolean
Long
Double
String
Map<String, Object>
List<Object>

因此，要添加，您可以执行以下操作:

mFireBaseReference = mFirebaseDatabase.getReference("apps");
mFireBaseReference.setValue(packageList1);