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如何在Android的EditText中仅限制文本为0-59之间的数字？

androidandroid-edittexttextwatcher
14

我有一个Edit Text，其中的数字只能在0-59之间，不能输入其他数字，我尝试过使用text-watcher，但没有成功。有什么建议吗？

12-26 14:59:39.715: E/AndroidRuntime(19494): FATAL EXCEPTION: main
12-26 14:59:39.715: E/AndroidRuntime(19494): java.lang.StackOverflowError
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.findViewTraversal(ViewGroup.java:2765)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.View.findViewById(View.java:10442)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.findViewTraversal(ViewGroup.java:2765)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.View.findViewById(View.java:10442)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.findViewTraversal(ViewGroup.java:2765)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.View.findViewById(View.java:10442)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.findViewTraversal(ViewGroup.java:2765)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.View.findViewById(View.java:10442)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.findViewTraversal(ViewGroup.java:2765)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.View.findViewById(View.java:10442)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.findViewTraversal(ViewGroup.java:2765)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.View.findViewById(View.java:10442)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.findViewTraversal(ViewGroup.java:2765)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.View.findViewById(View.java:10442)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.findViewTraversal(ViewGroup.java:2765)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.View.findViewById(View.java:10442)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.View.findViewShouldExist(View.java:4281)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.View.findUserSetNextFocus(View.java:4263)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.FocusFinder.findNextFocus(FocusFinder.java:66)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.focusSearch(ViewGroup.java:569)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.focusSearch(ViewGroup.java:571)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.focusSearch(ViewGroup.java:571)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.focusSearch(ViewGroup.java:571)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.focusSearch(ViewGroup.java:571)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.focusSearch(ViewGroup.java:571)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.focusSearch(ViewGroup.java:571)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.focusSearch(ViewGroup.java:571)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.ViewGroup.focusSearch(ViewGroup.java:571)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.View.focusSearch(View.java:4221)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.onCreateInputConnection(TextView.java:5378)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.inputmethod.InputMethodManager.startInputInner(InputMethodManager.java:977)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.view.inputmethod.InputMethodManager.restartInput(InputMethodManager.java:932)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:2958)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:2907)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.EditText.setText(EditText.java:90)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:2882)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at com.fishing.MyLocation$check_lat_degree.onTextChanged(MyLocation.java:236)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.sendOnTextChanged(TextView.java:7226)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:3045)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:2907)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.EditText.setText(EditText.java:90)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:2882)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at com.fishing.MyLocation$check_lat_degree.onTextChanged(MyLocation.java:236)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.sendOnTextChanged(TextView.java:7226)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:3045)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:2907)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.EditText.setText(EditText.java:90)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:2882)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at com.fishing.MyLocation$check_lat_degree.onTextChanged(MyLocation.java:236)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.sendOnTextChanged(TextView.java:7226)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:3045)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:2907)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.EditText.setText(EditText.java:90)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:2882)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at com.fishing.MyLocation$check_lat_degree.onTextChanged(MyLocation.java:236)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.sendOnTextChanged(TextView.java:7226)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:3045)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:2907)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.EditText.setText(EditText.java:90)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:2882)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at com.fishing.MyLocation$check_lat_degree.onTextChanged(MyLocation.java:236)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.sendOnTextChanged(TextView.java:7226)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:3045)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.java:2907)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.EditText.setText(EditText.java:90)
12-26 14:59:39.715: E/AndroidRuntime(19494):    at android.widget.TextView.setText(TextView.j
TextWatcher单独无法处理您的场景，就像“前提条件”、“条件”和“后置条件”一样。您需要做的就是制定自己的条件，然后使用任何3种方法将其附加到TextWatcher上。 - Usman Kurd
4个回答
20

这是我喜欢的做法：

public class InputFilterMinMax implements InputFilter {
    private int min;
    private int max;

    public InputFilterMinMax(int min, int max) {
        this.min = min;
        this.max = max;
    }

    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        //noinspection EmptyCatchBlock
        try {
            int input = Integer.parseInt(dest.subSequence(0, dstart).toString() + source + dest.subSequence(dend, dest.length()));
            if (isInRange(min, max, input))
                return null;
        } catch (NumberFormatException nfe) { }
        return "";
    }

    private boolean isInRange(int a, int b, int c) {
        return b > a ? c >= a && c <= b : c >= b && c <= a;
    }
}

然后在您的EditText上设置过滤器：

myEditText.setFilters(new InputFilter[]{new InputFilterMinMax(0, 59)});
1
很好的回答，我给你点赞了。 - Neha Shukla
1
它不适用于111〜999。如何更改以使用大于11的最小值？ - SDG69
这段代码有很多错误。请参考以下解决方案：https://dev59.com/qWYq5IYBdhLWcg3wxTWq#60824434 - nnyerges
11

在XML中使用此代码，仅允许数字在 编辑文本 中：

<EditText android:id="@+id/edit_text_id"
       android:layout_width="wrap_content"
       android:layout_height="wrap_content"
       android:inputType="numbers" />
为了控制输入到EditText中的文本值：
edittext.addTextChangedListener(new TextWatcher(){
    public void afterTextChanged(Editable s) {}

    public void beforeTextChanged(CharSequence s, int start, int count, int after){}

    public void onTextChanged(CharSequence s, int start, int before, int count){
        String strEnteredVal = edittext.getText().toString();

        if(!strEnteredVal.equals("")){
        int num=Integer.parseInt(strEnteredVal);
        if(num<60){
         edittext.setText(""+num);
        }else{
         edittext.setText("");
        }
    }

});
2
谢谢，但它会允许输入任何不在0-59之间的数字。 - sumit acharya
但它会出现堆栈溢出错误？有什么想法吗？在第 "edittext.setText(""+num);" 行。 - sumit acharya
我已经发布了，请在上面查看。 - sumit acharya
这个错误主要是由于布局复杂性引起的：请遵循旧帖子：https://dev59.com/wmHVa4cB1Zd3GeqPoZ3O。 - Sam-In-TechValens
3
我知道这是一个非常老的问题，但在搜索我的项目问题时，我发现了这个问题。在我的情况下，你的代码无法工作，因为 editText.setText（value） 导致了无限循环。我通过使用一个标志来解决了这个问题（示例在此处 @Yairopro 的答案）。另外，数字是以相反的顺序插入的，因为当你设置文本时，光标移动到行的开头，为了修复这个问题，你需要存储它的位置，设置文本，然后将光标移回它的位置。 - Luigi Cerone
2
void addAddTextChangeListener(final EditText et) {
        et.addTextChangedListener(new TextWatcher() {
            boolean textModified = false;
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

            }

            @Override
            public void afterTextChanged(Editable s) {
                String strEnteredVal = et.getText().toString();
                if(!strEnteredVal.equals("") && !(strEnteredVal.length() < 2)) {
                    int num = Integer.parseInt(strEnteredVal);
                    if (!textModified) {
                        if (num > 60) {
                            et.setText("");
                        } else {
                            textModified = true;
                            et.setText("" + num);
                            et.setEnabled(false);
                        }
                    }
                }
            }

        });
    }

在XML文件中的EditText输入条目中，使用android:inputType="number"。但是一旦输入正确，该代码将停止工作，因此您应该在此之后禁用EditText。
2

首先，将输入类型设置为数字，并限制editText的输入数量。

editText.setInputType( InputType.TYPE_CLASS_NUMBER );
    InputFilter[] FilterArray = new InputFilter[1];
    FilterArray[0] = new InputFilter.LengthFilter(2);
    editText.setFilters(FilterArray);

然后，添加一个 TextWatcher 来检查用户输入的内容，如果值超过59，则显示警报或任何消息，该数字将小于60。

editText.addTextChangedListener(new TextWatcher() {
@Override
public void afterTextChanged(Editable s) {
    // TODO Auto-generated method stub

    String added_number = editText.getText().toString();
    if (added_number.length != 0) {
        int number  = Integer.parseInt(added_number);

        if (number > 59)
            Toast.makeText(getApplicationContext, "Not more than 59", Toast.LENGTH_SHORT).show();
    }

}

@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    // TODO Auto-generated method stub
}

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
    // TODO Auto-generated method stub

});
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