创建弹出窗口

Question

public class PrizeList extends AppCompatDialogFragment {

    TextView players, prizePoolList, perKill, rank1, rank2, rank3;
    SeekBar seekBar;

    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        LayoutInflater inflater = getActivity().getLayoutInflater();
        View view = inflater.inflate(R.layout.prize_list_layout, null);
        builder.setView(view).setTitle("Prize List")
                .setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });

        players = view.findViewById(R.id.players);
        prizePoolList = view.findViewById(R.id.prizePoolList);
        perKill = view.findViewById(R.id.perKill);
        rank1 = view.findViewById(R.id.rank1);
        rank2 = view.findViewById(R.id.rank2);
        rank3 = view.findViewById(R.id.rank3);
        seekBar = view.findViewById(R.id.seekBar);

        return builder.create();
    }
}

holder.prizeList.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openDialog();
                Toast.makeText(v.getContext(), "prize list clicked", Toast.LENGTH_SHORT).show();
            }
        });


    }

    private void openDialog() {
        PrizeList prizeList = new PrizeList();
        prizeList.show(prizeList.requireActivity().getSupportFragmentManager(), "Prize");
    }

E/AndroidRuntime：致命异常：main process：com.luteraa.luteraaesports,pid：6355 java.lang.nullpointerException：试图在com.luteraa.luteraaesports.bgmicategoryAdapter.OpenDialog（bgmicategoryAdapter.java.access$000(bgmicategoryAdapter.java:25)的com.luteraaa.luteraaesports.bgmicategoryAdapter.bgmicateAdapter.bgmicateAdapter.access eGoryAdapter$1.onclick(bgmicateGoryAdapter.java:76)在Android.view.view.performClick(View.java:7191)在com.google.android.material.button.materialbutton.performClick(view.java:1119)在Android.view.view.performClick(materalbutton.java:1119)在Android.view.view.view.performClick(vieralbutton.java:1119)在er.java:100)在Android.os.looper.loop（循环）r.java:224)在Android.app.activitythread.main（activitythread.java:7551)在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.runtimeinit$methodandargscaller.run（runtimeinit.java:539)在com.android.internal.os.zygoteinit.main(zygoteinit.java:995)

Answer 1

  DataAdapter adapter = new DataAdapter(MainActivity.this,tasks,getSupportFragmentManager());

您可以在适配器调用中传递参数getSupportFragmentManager，并在getSupportFragmentManager中获取构造函数，如下所示

    DataAdapter(Context context, List<Task> tasklist, 
   FragmentManager 
   supportFragmentManager) {
    this.context = context;
    this.taskList = tasklist;
    this.supportFragmentManager=supportFragmentManager;
}

在prizeList show方法中传递对象supportFragmentManager之后

PrizeList prizeList = new PrizeList();
        prizeList.show(supportFragmentManager, "Prize List");

我也在我的项目中工作，所以这有助于解决您在supportFragmentManager中的错误