Question

我已经创建了一个自定义类扩展对话框片段，我现在使用布局扩展到此对话框，当我想在主要活动中设置我的onclicklistener但是当我设置我的点击监听器时它返回空点异常继承我的主要活动和我的对话片段：

    @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final Button cancelDialog = (Button) findViewById(R.id.cancelDialogButton);
    View.OnClickListener listenerDialog = new View.OnClickListener() {
        @Override
        public void onClick(View v) {

        }
    };
//this is where i get the null point exception
    cancelDialog.setOnClickListener( listenerDialog );


    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    final ViewGroup Addition = (ViewGroup) findViewById(R.id.activity_addition);
    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

                FragmentManager fm = getSupportFragmentManager();
                DialogCards editNameDialogFragment = DialogCards.newInstance();
                editNameDialogFragment.show(fm, "fragment_edit_name");

        }
    });

现在我的服装类扩展了对话框片段：

public class DialogCards extends DialogFragment {


public Dialog dialog;

@NonNull
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    Dialog dialog = super.onCreateDialog(savedInstanceState);
    // request a window without the title
    dialog.getWindow().requestFeature(Window.FEATURE_NO_TITLE);
    return dialog;


}

@Override
public void onResume() {
    // Store access variables for window and blank point
    Window window = getDialog().getWindow();
    Point size = new Point();
    // Store dimensions of the screen in `size`
    Display display = window.getWindowManager().getDefaultDisplay();
    display.getSize(size);
    // Set the width of the dialog proportional to 75% of the screen width
    window.setLayout((int) (size.x * 0.75), WindowManager.LayoutParams.WRAP_CONTENT + 20);
    window.setGravity(Gravity.CENTER);
    // Call super onResume after sizing

    super.onResume();
}

public DialogCards() {

}

public static DialogCards newInstance() {
    DialogCards frag = new DialogCards();
    Bundle args = new Bundle();
    frag.setArguments(args);
    return frag;
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    return inflater.inflate(R.layout.carddialog, container);

}

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    getDialog().getWindow().setSoftInputMode(
            WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);

}}

Answer 1

您可以在DialogCards类中替换此方法

 @Override
 public void onViewCreated(View view, @Nullable Bundle  savedInstanceState) {
super.onViewCreated(view, savedInstanceState);

  getDialog().getWindow().setSoftInputMode(
        WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE);
  final Button cancelDialog = (Button)view.findViewById(R.id.cancelDialogButton);
  View.OnClickListener listenerDialog = new View.OnClickListener() {
    @Override
    public void onClick(View v) {

    }
};
cancelDialog.setOnClickListener( listenerDialog );
}}

setonclicklistener用于自定义dialogfragment类中的按钮

1 个答案: