Android: 以编程方式从 Java 代码中填充 Spinner

如何通过编程方式从 Java 代码中填充微调器？

我在布局中有一个这样的旋转器:

 <Spinner
android:id="@+id/consultation_deseases"
android:layout_width="@dimen/bigSpinnerWidth"
android:layout_height="@dimen/bigSpinnerHeight"
android:prompt="@string/disease_prompt" />

使用 Java 代码，我需要创建适配器并添加条目。

121305 次浏览
小开
最佳答案 
// you need to have a list of data that you want the spinner to display
List<String> spinnerArray =  new ArrayList<String>();
spinnerArray.add("item1");
spinnerArray.add("item2");


ArrayAdapter<String> adapter = new ArrayAdapter<String>(
this, android.R.layout.simple_spinner_item, spinnerArray);


adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
Spinner sItems = (Spinner) findViewById(R.id.spinner1);
sItems.setAdapter(adapter);

also to find out what is selected you could do something like this

String selected = sItems.getSelectedItem().toString();
if (selected.equals("what ever the option was")) {
}
小开

Here is an example to fully programmatically:

  • init a Spinner.
  • fill it with data via a String List.
  • resize the Spinner and add it to my View.
  • format the Spinner font (font size, colour, padding).
  • clear the Spinner.
  • add new values to the Spinner.
  • redraw the Spinner.

I am using the following class vars:

Spinner varSpinner;
List<String> varSpinnerData;


float varScaleX;
float varScaleY;

A - Init and render the Spinner (varRoot is a pointer to my main Activity):

public void renderSpinner() {




List<String> myArraySpinner = new ArrayList<String>();


myArraySpinner.add("red");
myArraySpinner.add("green");
myArraySpinner.add("blue");


varSpinnerData = myArraySpinner;


Spinner mySpinner = new Spinner(varRoot);


varSpinner = mySpinner;


ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(varRoot, android.R.layout.simple_spinner_item, myArraySpinner);
spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); // The drop down vieww
mySpinner.setAdapter(spinnerArrayAdapter);

B - Resize and Add the Spinner to my View:

    FrameLayout.LayoutParams myParamsLayout = new FrameLayout.LayoutParams(
FrameLayout.LayoutParams.MATCH_PARENT,
FrameLayout.LayoutParams.WRAP_CONTENT);
myParamsLayout.gravity = Gravity.NO_GRAVITY;


myParamsLayout.leftMargin = (int) (100 * varScaleX);
myParamsLayout.topMargin = (int) (350 * varScaleY);
myParamsLayout.width = (int) (300 * varScaleX);;
myParamsLayout.height = (int) (60 * varScaleY);;




varLayoutECommerce_Dialogue.addView(mySpinner, myParamsLayout);

C - Make the Click handler and use this to set the font.

    mySpinner.setOnItemSelectedListener(new OnItemSelectedListener() {


@Override
public void onItemSelected(AdapterView<?> parentView, View selectedItemView, int myPosition, long myID) {


Log.i("renderSpinner -> ", "onItemSelected: " + myPosition + "/" + myID);


((TextView) parentView.getChildAt(0)).setTextColor(Color.GREEN);
((TextView) parentView.getChildAt(0)).setTextSize(TypedValue.COMPLEX_UNIT_PX, (int) (varScaleY * 22.0f) );
((TextView) parentView.getChildAt(0)).setPadding(1,1,1,1);




}


@Override
public void onNothingSelected(AdapterView<?> parentView) {
// your code here
}


});


}

D - Update the Spinner with new data:

private void updateInitSpinners(){


String mySelected = varSpinner.getSelectedItem().toString();
Log.i("TPRenderECommerce_Dialogue -> ", "updateInitSpinners -> mySelected: " + mySelected);




varSpinnerData.clear();


varSpinnerData.add("Hello World");
varSpinnerData.add("Hello World 2");


((BaseAdapter) varSpinner.getAdapter()).notifyDataSetChanged();
varSpinner.invalidate();
varSpinner.setSelection(1);


}

}

What I have not been able to solve in the updateInitSpinners, is to do varSpinner.setSelection(0); and have the custom font settings activated automatically.

UPDATE:

This "ugly" solution solves the varSpinner.setSelection(0); issue, but I am not very happy with it:

private void updateInitSpinners(){


String mySelected = varSpinner.getSelectedItem().toString();
Log.i("TPRenderECommerce_Dialogue -> ", "updateInitSpinners -> mySelected: " + mySelected);




varSpinnerData.clear();


ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(varRoot, android.R.layout.simple_spinner_item, varSpinnerData);
spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
varSpinner.setAdapter(spinnerArrayAdapter);




varSpinnerData.add("Hello World");
varSpinnerData.add("Hello World 2");


((BaseAdapter) varSpinner.getAdapter()).notifyDataSetChanged();
varSpinner.invalidate();
varSpinner.setSelection(0);


}

}

Hope this helps......


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