Question

我是android studio的初学者。我被困在这一点，无法将数据从活动传递到对话框。我已经尝试了捆绑但是也没有工作因为它显示了NULL点异常。或者我猜我的方法是错误的。如果我能得到它会很棒一些帮助。

对话类

public class Mdlog extends DialogFragment
{
LayoutInflater inflater;
TextView sc1,sc2;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());
    inflater=getActivity().getLayoutInflater();
    View view=inflater.inflate(R.layout.layout_dialog,null);
    Intent i=getActivity().getIntent();
    sc1= (TextView) view.findViewById(R.id.score1);
    sc2= (TextView) view.findViewById(R.id.score2);
    sc1.setText(i.getStringExtra("sc1"));
    sc2.setText(i.getStringExtra("sc2"));
    builder.setView(view);
    AlertDialog dialog=builder.create();

    return dialog;
}}

MainActivity类

 public class MainActivity extends AppCompatActivity {

int sc1=0;
int sc2=0;

TextView t;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    t= (TextView) findViewById(R.id.timeleft);
    new CountDownTimer(3000,1000)
    {

        @Override
        public void onTick(long millisUntilFinished)
        {
            t.setText(""+millisUntilFinished/1000);
            sc1+=1;
            sc2+=2;
        }

        @Override
        public void onFinish()
        {

        }
    }.start();
    Intent i=new Intent(this,Mdlog.class);
    i.putExtra("sc1",sc1);
    i.putExtra("sc2",sc2);
    startActivity(i);
    Mdlog dialog=new Mdlog();
    dialog.show(getFragmentManager(),"sss");

}}

Answer 1

删除整个，

Intent i=new Intent(this,Mdlog.class);
    i.putExtra("sc1",sc1);
    i.putExtra("sc2",sc2);
    startActivity(i);

为bundle设置arguments以传递数据，然后设置为您的片段，

    Bundle args = new Bundle();
    args.putInt("sc1", sc1);
    args.putInt("sc2", sc2);
    Mdlog dialog=new Mdlog();
    dialog.setArguments(args);
    dialog.show(getFragmentManager(),"dialog");

使用

在对话框中获取数据

Bundle args = getArguments();
int sc1 = args.getInt("sc1");
int sc2 = args.getInt("sc2");

Answer 2

您应该使用静态方法创建片段。如果在DialogFragment中键入newIsntance，Android Studio将生成一个newInstance静态方法。您可以将数据传递给该方法。例如：

public static DialogFragment newInstance(int value1, int value2) {
    DownloadDialogFragment dialogFragment = new DownloadDialogFragment();

    Bundle args = new Bundle();
    args.putInt("args_value1", value1);
    args.putInt("args_value2", value2);

    dialogFragment.setArguments(args);
    return dialogFragment;
}

您可以像onCreateDialog(Bundle savedInstanceState)这样获取数据：

public Dialog onCreateDialog(Bundle savedInstanceState) {

    int value1 = getArguments().getInt("args_value1");
    int value2 = getArguments().getInt("args_value2");
}

如何将数据从Activity发送到扩展Dialog Fragment的自定义对话框

2 个答案: