gpt4 book ai didi

android - 在android中按下按钮时如何删除某些元素

转载 作者:行者123 更新时间:2023-11-29 02:26:57 24 4
gpt4 key购买 nike

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,我有一个“复制”按钮,当您单击该按钮时,会出现一个复选框,您可以添加任意多个。所以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。我用粗体突出显示了我认为是问题所在的代码。

  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;
}
}
}

最佳答案

更新:以下答案的解释:OP 通过以下方式添加了 Checkboxes、Buttons 和 Spinners 的实例(Checkbox 示例):

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;
}

创建这些 View 的实例后,它们被保存在 List<> 中像这样跟踪:

private List<CheckBox> mCheckboxes = new ArrayList<>();

//Add a new checkbox
CheckBox newCheckbox = makeCheckbox();

//TODO add checkbox to your list
mCheckboxes.add(newCheckbox);

最后新 View 被添加到根ViewGroup在我们的例子中是 LinearLayout:

private LinearLayout mLinearLayout;

mLinearLayout = findViewById(R.id.my_linearLayout);
mLinearLayout.addView(newCheckbox);

当使任何元素消失并删除它们的实例时,我通过 List<> 访问它们的实例我保持:

mCheckboxes.get(mCheckboxes.size()-1).setVisibility(View.GONE);
mCheckboxes.remove(mCheckboxes.size()-1);

这是我认为你应该做的:你应该创建一个按钮列表和一个复选框列表,就像你为微调器所做的那样,在那里你可以获得你创建的按钮和复选框的实例:

private LinearLayout mLinearLayout;

private ArrayList<Spinner> 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) {
// 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);
layoutParams.height = 80;//pixels
layoutParams.width = 240;//pixels
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);
}
});

//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);
}

//Last checkbox disappears
If(mCheckboxes.size() > 0) {
mCheckboxes.get(mCheckboxes.size() - 1).setVisibility(View.GONE);
}
//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

}


//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) {
buttontest.setVisibility(View.GONE);
makeCheckbox().setVisibility(View.GONE);
}
});**






// 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
Spinner spinner = new Spinner(this, Spinner.MODE_DROPDOWN);

// 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;
}
}
}

新编辑:

public class create extends AppCompatActivity {


private LinearLayout mLinearLayout;

private ArrayList<Spinner> 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) {
// 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);
layoutParams.height = 80;//pixels
layoutParams.width = 240;//pixels
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) {
//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);
}
//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
Spinner spinner = new Spinner(this, Spinner.MODE_DROPDOWN);

// 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;
}
}
}

关于android - 在android中按下按钮时如何删除某些元素,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/51737773/

24 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com