Question

我创建了一个自定义对话框，但是我无法将文本设置为java中对话框布局中的textview，程序崩溃了。我的错是什么？

public class Total_CBC extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.total_cbc);
    final TextView RBC_T = (TextView) findViewById(R.id.total_cbc_text_rbc);

    Button RBC_B = (Button) findViewById(R.id.total_cbc_btn_rbc);

    //

    RBC_B.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            showCustomDialog(RBC_T);
        }
    });
}


protected void showCustomDialog(final TextView _RBC_T) {
    final Dialog dialog = new Dialog(Total_CBC.this);
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
    dialog.setContentView(R.layout.dialog_edit);
    final EditText editText = (EditText) dialog.findViewById(R.id.dialog_edit_edittext);
    Button button = (Button) dialog.findViewById(R.id.dialog_edit_btn);
    TextView titel = (TextView) findViewById(R.id.dialog_edit_text_title);
    titel.setText("RBC");
    button.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            _RBC_T.setText(editText.getText().toString());
            dialog.dismiss();
        }
    });
    dialog.show();
}

}当我删除此行程序时，我需要设置文本

titel.setText("RBC");

Answer 1

更改

 TextView titel = (TextView) findViewById(R.id.dialog_edit_text_title);

到

 TextView titel = (TextView) dialog.findViewById(R.id.dialog_edit_text_title);

Answer 2

您正在尝试在显示对话框之前设置TextView的文本，这就是为什么它返回null。正确的方法是在创建对话框后设置文本：

将其放入自定义对话框

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        TextView titel = (TextView)dialog.findViewById(R.id.dialog_edit_text_title);
        titel.setText("RBC");
        return builder.create();
    }

在自定义对话框中设置textview

2 个答案: