Question

im试图通过（+）按钮获取动态添加的edittext字段的值，并将其存储在变量中，然后对其进行一些操作。添加edittext字段没有问题。我是Java和android的新手，请原谅我是否太简单了，无法向您询问，但是找不到经验丰富的人提供的更好的地方，可以给我我可以理解的答案。同样，如果只有一个edittext字段，我可以通过元素的@id来实现，但是由于这些是通过按钮动态添加的字段，并且都具有相同的名称，因此有点难以解决。所以这是场景：我的应用程序中有一个按钮，通过按下它会添加一个线性布局，其中包括edittext字段，一个下拉框和一个remove按钮。我想放另一个键来查找那里有多少edittext字段，获取它们中的字符串值，将它们转换为double值，将它们全部求和，然后将它们存储在double变量中。谢谢您的帮助。

activity_main.xml

package com.example.dell.cheapin;

import android.os.Bundle;
import android.support.constraint.ConstraintLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.EditText;
import android.widget.LinearLayout;

public class MainActivity extends AppCompatActivity {

    public LinearLayout parentLinearLayout;
    public ConstraintLayout FieldLayout;
    public static final String Computable_Edit_text_tag="EditTextTag";

    public double totalvalue, textvalue;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        parentLinearLayout = (LinearLayout) findViewById(R.id.parent_linear_layout);
    }
    public void onAddField(View v) {
        LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        final View rowView = inflater.inflate(R.layout.field,parentLinearLayout,false);
        // Add the new row before the add field button.
        parentLinearLayout.addView(rowView, parentLinearLayout.getChildCount() - 1);
    }

    public void onCompute(View v){
        int size = parentLinearLayout.getChildCount();
        for (int i=0; i <= size; i++) {
            View FieldView = parentLinearLayout.getChildAt(i);
            FieldLayout = (ConstraintLayout)findViewById(R.id.field_layout);
            int size2 = FieldLayout.getChildCount();
            for (int j = 0; j <= size2; j++) {
                View FieldView2 = FieldLayout.getChildAt(j);
                if (FieldView2 instanceof EditText && Computable_Edit_text_tag.equals(FieldView2.getTag().toString())) {
                    EditText et = (EditText) FieldView2;
                    totalvalue = Integer.parseInt(et.toString()) + totalvalue;
                }
            }
        }
        Snackbar TotalSnackbar = Snackbar.make(parentLinearLayout,Double.toString(totalvalue),Snackbar.LENGTH_LONG);
        TotalSnackbar.show();

    }


    public void onDelete(View v) {
        parentLinearLayout.removeView((View) v.getParent());
    }

    public void onEnter(View v){
        EditText ET = (EditText)findViewById(R.id.amount_edit_text);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

MainActivity.java

FieldLayout=fieldView;

好吧，我能够在您的帮助下解决此问题，并且还必须在int size2 = FieldLayout.getChildCount();之前添加FieldLayout，因为如果没有Null会返回public void onCompute(View v){ totalvalue=0; int size = parentLinearLayout.getChildCount(); for (int i=0; i < size; i++) { ConstraintLayout fieldView = (ConstraintLayout)parentLinearLayout.getChildAt(i); FieldLayout=fieldView; int size2 = FieldLayout.getChildCount(); for (int j = 0; j < size2; j++) { View FieldView2 = FieldLayout.getChildAt(j); if (FieldView2 instanceof EditText && Computable_Edit_text_tag.equals(FieldView2.getTag().toString())) { EditText et = (EditText) FieldView2; String myNumber = et.getText().toString(); totalvalue = Integer.parseInt(myNumber) + totalvalue; } } } Snackbar TotalSnackbar = Snackbar.make(parentLinearLayout,getString(R.string.TotalMessage)+" "+String.valueOf(totalvalue),Snackbar.LENGTH_LONG); TotalSnackbar.show();，并且应用程序将崩溃。这是完成的代码：

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Answer 1

每次将EditText添加到ViewGroup中时，就对其进行标记。有一种方法View#setTag(Object)就是这样做的。例如使用一些private static final String EDIT_TEXT_TAG="edittexttag";

要计算总和，您可以循环遍历EditText中的所有ViewGroup（假设它由变量myViewGroup引用）

int size = myViewGroup.getChildCount();
for(int i = 0; i < size; i++){
    View view = myViewGroup.getChildAt(i);
    if(view instanceof EditText && EDIT_TEXT_TAG.equals(view.getTag().toString())){
        EditText et = (EditText)view;
        // get the number and add it to the total...
    }
}

请注意，getChildAt()仅会给您直接的孩子。如果EditText是其他子项ViewGroup的一部分，那么您将不得不调整逻辑以在该子项ViewGroup中寻找它们。但是，如果EditText中只有一个带有特定标签的ViewGroup，则不必遍历整个子树即可获得它，但是可以使用View#findViewWithTag()-这将给您是第一个（大）*子View，它恰巧找到了所需标签。

我将添加您的onCompute()版本以显示我的意思

public void onCompute(View v){
    int size = parentLinearLayout.getChildCount();
    // "<" not "<=" !
    // (counting starts at 1, index starts at 0, number of steps must be the same)
    for (int i=0; i < size; i++) {
        // the ConstraintLayouts are all direct 
        // children of the parent LinearLayout
        ConstraintLayout fieldView = (ConstraintLayout)parentLinearLayout.getChildAt(i);

        int size2 = fieldView.getChildCount();
        // Again: "<" not "<=" !
        for (int j = 0; j < size2; j++) {
            View fieldView2 = fieldView.getChildAt(j);
            if (fieldView2 instanceof EditText && Computable_Edit_text_tag.equals(fieldView2.getTag().toString())) {
                EditText et = (EditText) fieldView2;
                // not et.toString() but et.getText().toString()
                //
                String myNumber = et.getText().toString();
                totalvalue = Integer.parseInt(myNumber) + totalvalue;
            }
        }
    }
    Snackbar TotalSnackbar = Snackbar.make(parentLinearLayout,Double.toString(totalvalue),Snackbar.LENGTH_LONG );
    TotalSnackbar.show();

}

请注意，如果用户设法输入除数字以外的任何内容，这将会崩溃-但是如何避免使用NumberFormatException，这是另一个问题

汇总动态添加的编辑文本字段的值

1 个答案: