【发布时间】：2019-01-15 04:37:30
【问题描述】：
当您在应用程序中按下按钮时，您将如何删除某些元素，例如微调器和复选框？
谢谢！
编辑：
在我的情况下，当您单击“复制”按钮时，会出现一个复选框，您可以根据需要添加任意数量的按钮。因此，当我想删除它们时，我不确定，因为我没有为这些重复的复选框设置变量名称来删除..下面是创建新复选框的代码。注意： buttontest 是应该删除其他项目的按钮。我用粗体突出了我认为是问题的代码。
public class create extends AppCompatActivity {
private LinearLayout mLinearLayout;
private ArrayList<SearchableSpinner> mSpinners;
//TODO add the below list of buttons and checkboxes
private List<AppCompatButton> mButtons = new ArrayList<>();
private List<CheckBox> mCheckboxes = new ArrayList<>();
Button buttontest;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mSpinners = new ArrayList<>();
mLinearLayout = findViewById(R.id.my_linearLayout);
//mLinearLayout.addView(makeSpinner()); // First spinner
FloatingActionButton floatingActionButton =
(FloatingActionButton) findViewById(R.id.fab);
floatingActionButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getBaseContext(), "Item added!" , Toast.LENGTH_SHORT ).show();
// Handle the click.
Spinner spinner = makeSpinner();
mLinearLayout.addView(spinner); //Add another spinner
LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams)spinner.getLayoutParams();
layoutParams.setMargins( 5, 70, 10, 0);
Resources resources = getResources();
DisplayMetrics metrics = resources.getDisplayMetrics();
layoutParams.height = (int) (80 * ((float)metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT)); //80
layoutParams.width = (int) (240 * ((float)metrics.densityDpi / DisplayMetrics.DENSITY_DEFAULT)); //240
spinner.setLayoutParams(layoutParams);
//Add a new button
AppCompatButton newButton = makeButton();
mLinearLayout.addView(newButton); // Add another button
//TODO add button to the list
mButtons.add(newButton);
//Add a new checkbox
CheckBox newCheckbox = makeCheckbox();
mLinearLayout.addView(newCheckbox);
//TODO add checkbox to your list
mCheckboxes.add(newCheckbox);
}
});
}
//DUPLICATING ITEMS WHEN + IS PRESSED
private CheckBox makeCheckbox() {
//Create new Checkbox
CheckBox checkbox = new CheckBox(this);
// Setup layout
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
checkbox.setLayoutParams(layoutParams);
return checkbox;
}
private AppCompatButton makeButton() { //creates new buttons i need
//Create new Button
AppCompatButton button = new AppCompatButton(this);
// code for deleting the buttons i need //
buttontest = (Button)findViewById(R.id.buttontest);
buttontest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getBaseContext(), "Item removed." , Toast.LENGTH_SHORT ).show();
//makeCheckbox().setVisibility(View.GONE);
//buttontest.setVisibility(View.GONE);
//TODO when you want to make one of them gone do the following
//Last button disappears
if(mButtons.size() > 0) {
mButtons.get(mButtons.size()-1).setVisibility(View.GONE);
//mButtons.remove(mButtons.size()-1);
}
//Last checkbox disappears
if(mCheckboxes.size() > 0) {
mCheckboxes.get(mCheckboxes.size()-1).setVisibility(View.GONE);
// mCheckboxes.remove(mCheckboxes.size()-1);
}
//Last checkbox disappears
if(mSpinners.size() > 0) {
mSpinners.get(mSpinners.size()-1).setVisibility(View.GONE);
// mSpinners.remove(mSpinners.size()-1);
}
//Please note that the number within get() is the index of the buttons or
//checkboxes you added so there could
//be any number of items depends on how many you added
}
});
// Setup layout
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
button.setBackgroundColor(Color.parseColor("#ffffff"));
return button;
}
private Spinner makeSpinner() {
//opens csv
InputStream inputStream = getResources().openRawResource(R.raw.shopitems);
CSVFile csvFile = new CSVFile(inputStream);
List<String> itemList = csvFile.read();
//Create new spinner
// SearchableSpinner spinner = (SearchableSpinner) new Spinner(this, Spinner.MODE_DROPDOWN);
SearchableSpinner spinner = new SearchableSpinner(this);
// Setup layout
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
spinner.setLayoutParams(layoutParams);
MyListAdapter adapter = new MyListAdapter(this, R.layout.listrow, R.id.txtid, itemList);
spinner.setAdapter(adapter);
//Add it to your list of spinners so you can retrieve their data when you click the getSpinner button
mSpinners.add(spinner);
return spinner;
}
//csv file code
private class CSVFile {
InputStream inputStream;
public CSVFile(InputStream inputStream) {
this.inputStream = inputStream;
}
public List<String> read() {
List<String> resultList = new ArrayList<String>();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
try {
String line;
while ((line = reader.readLine()) != null) {
String[] row = line.split(",");
resultList.add(row[1]);
}
} catch (IOException e) {
Log.e("Main", e.getMessage());
} finally {
try {
inputStream.close();
} catch (IOException e) {
Log.e("Main", e.getMessage());
}
}
return resultList;
}
}
}
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标签： android button checkbox spinner