我希望通过单击文本视图时出现的对话框在文本视图中显示数字

Question

public void goldWeight(){
    Dialog dialog = new Dialog(HomeActivity.this);
    dialog.requestWindowFeature(Window.FEATURE_LEFT_ICON);
    dialog.setContentView(R.layout.gold_w_grm);
    dialog.setTitle("GOLD WEIGHT[Grams]");
    dialog.setCancelable(true);

    NumberPicker np1=(NumberPicker)dialog.findViewById(R.id.grm);
    np1.setMaxValue(9999);
    np1.setMinValue(0000);
    int grams = np1.getValue();

    NumberPicker np2=(NumberPicker)dialog.findViewById(R.id.mgrm);
    np2.setMaxValue(9999);
    np2.setMinValue(0000);
    int mgrams = np2.getValue();

    double gw;
    gw = grams+(mgrams/100f);
    String value = "" + gw;

    //value.toString();
    //String numberAsString = Double.toString(gw);
    TextView TV2 = (TextView)findViewById(R.id.UserGoldWeight);
    TV2.setText(value);
    //TV2.setText("hfhgf");
    dialog.show();
} //Layout for this Dialog      elativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/GoldWeightGrams"
android:layout_width="wrap_content"
android:layout_height="match_parent">
<NumberPicker
    android:id="@+id/grm"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="40dp"
    android:layout_centerHorizontal="false"
    android:layout_weight="1" />
<NumberPicker
    android:id="@+id/mgrm"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="120dp"
    android:layout_centerHorizontal="false"
    android:layout_weight="1" />

Issue is program set 0.0 to text view when click on the view and fail to change it when dialog disappear. I want to get value from number pickers and show them in the text view when dialog disappear.

Answer 1

use following code i think your problem solve

 public void goldWeight() {
    final Dialog dialog = new Dialog(HomeActivity.this);
    dialog.requestWindowFeature(Window.FEATURE_LEFT_ICON);
    dialog.setContentView(R.layout.testting);
    dialog.setTitle("GOLD WEIGHT[Grams]");
    dialog.setCancelable(true);
    final NumberPicker np1 = (NumberPicker) dialog.findViewById(R.id.grm);
    np1.setMaxValue(9999);
    np1.setMinValue(0000);
    final NumberPicker np2 = (NumberPicker) dialog.findViewById(R.id.mgrm);
    np2.setMaxValue(9999);
    np2.setMinValue(0000);
    Button btnOK = (Button) dialog.findViewById(R.id.btnDialog);
    btnOK.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            int grams = np1.getValue();
            int mgrams = np2.getValue();
            double gw = grams + (mgrams / 100f);
            TextView TV2 = (TextView) findViewById(R.id.text);
            TV2.setText("" + gw);
            dialog.dismiss();
        }
    });

    dialog.show();
}

change your gold_w_grm XML file Like:

<NumberPicker
    android:id="@+id/grm"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="40dp"
    android:layout_weight="1" />
<NumberPicker
    android:id="@+id/mgrm"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="120dp"
    android:layout_weight="1" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/btnDialog"
    android:text="OK"/>

Answer 2

its not changed because you put the calculation before the NumberPicker change.

Try to put event on them

int grams, mgrams;
double gw;
TextView TV2;
public void goldWeight(){
    Dialog dialog = new Dialog(HomeActivity.this);
    dialog.requestWindowFeature(Window.FEATURE_LEFT_ICON);
    dialog.setContentView(R.layout.gold_w_grm);
    dialog.setTitle("GOLD WEIGHT[Grams]");
    dialog.setCancelable(true);

    NumberPicker np1=(NumberPicker)dialog.findViewById(R.id.grm);
    np1.setMaxValue(9999);
    np1.setMinValue(0000);
    //set the last value
    np1.setValue(grams);

    NumberPicker np2=(NumberPicker)dialog.findViewById(R.id.mgrm);
    np2.setMaxValue(9999);
    np2.setMinValue(0000);
    //set the last value
    np2.setValue(mgrams);

    TV2 = (TextView)findViewById(R.id.UserGoldWeight);

    np1.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
        @Override
        public void onValueChange(NumberPicker numberPicker, int i, int i1) {
            grams= numberPicker.getValue();
            changeTextView();
        }
    });
    np2.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
        @Override
        public void onValueChange(NumberPicker numberPicker, int i, int i1) {
            mgrams= numberPicker.getValue();
            changeTextView();
        }
    });


    dialog.show();
}

void changeTextView(){
    //             mgrams/100f -> its float and not able to do more than 3 decimal number
    //gw = grams+(mgrams/100f);
    gw = grams+(((double)mgrams)/10000);
    //to be precise, convert it to decimal format (rounding), already tested and works perfectly on my device
    DecimalFormat df = new DecimalFormat("#.####");
    df.setRoundingMode(RoundingMode.CEILING);

    String value = "" + df.format(gw);
    TV2.setText(value);
}