如何从GridView的适配器中获取每个EditText的值？

Question

我正在研究一个矩阵计算器应用程序，我很难弄清楚如何获取GridView中每个EditText的值。我需要得到这些值才能将它们放入另一个矩阵并计算出来。

如果用户想要使用3x2矩阵，则GridView看起来像这样。它包含六个EditTexts因为3 * 2 = 6

一个GridView下面是上述该照片的XML：

<RelativeLayout 
    android:layout_width="368dp" 
    android:layout_height="495dp" 
    tools:layout_editor_absoluteX="8dp" 
    tools:layout_editor_absoluteY="8dp"> 

    <TextView 
     android:id="@+id/textView10" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_alignParentTop="true" 
     android:layout_marginLeft="15dp" 
     android:layout_marginStart="15dp" 
     android:text="Please input the numbers on both matrices." /> 

    <TextView 
     android:id="@+id/textView11" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/textView10" 
     android:layout_alignStart="@+id/textView10" 
     android:layout_below="@+id/textView10" 
     android:layout_marginTop="21dp" 
     android:text="Matrix1: " 
     android:textStyle="bold" /> 

    <GridView 
     android:id="@+id/grid" 
     android:layout_width="match_parent" 
     android:layout_height="300dp" 
     android:layout_alignLeft="@+id/textView11" 
     android:layout_alignParentEnd="true" 
     android:layout_alignParentRight="true" 
     android:layout_alignStart="@+id/textView11" 
     android:layout_below="@+id/textView11" /> 

    <TextView 
     android:id="@+id/textView8" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:text="Please fill in all of the fields" 
     android:textColor="#FF0000" 
     android:visibility="invisible" 
     android:layout_below="@+id/grid" 
     android:layout_alignLeft="@+id/grid" 
     android:layout_alignStart="@+id/grid" 
     android:layout_marginTop="15dp" /> 

    <Button 
     android:id="@+id/button4" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignLeft="@+id/textView8" 
     android:layout_alignStart="@+id/textView8" 
     android:layout_below="@+id/textView8" 
     android:layout_marginTop="11dp" 
     android:onClick="setEmptyToZero" 
     android:text="Set Empy Fields to Zero" /> 

    <Button 
     android:id="@+id/button5" 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:layout_alignTop="@+id/button4" 
     android:layout_marginLeft="28dp" 
     android:layout_marginStart="28dp" 
     android:layout_toEndOf="@+id/button4" 
     android:layout_toRightOf="@+id/button4" 
     android:onClick="nextMatrix" 
     android:text="Next Matrix" /> 

</RelativeLayout> 

这里是为GridView项目的XML。我不知道如何从他们那里得到的值：

<EditText 
    android:id="@+id/editText3" 
    android:layout_width="50dp" 
    android:layout_height="wrap_content" 
    android:gravity="center" 
    android:ems="10" 
    android:inputType="numberDecimal" /> 

这里是MatrixAdapter为GridView：

public class MatrixAdapter extends BaseAdapter { 
    Context context; 
    List<Matrix> matrixList; 

    //Or create an int[rows][columns] CHANGE INTO THAT LATER 
    public MatrixAdapter(Context context, List<Matrix> matrixList) { 
     this.context = context; 
     this.matrixList = matrixList; 
    } 

    @Override 
    public int getCount() { 

     return matrixList.size(); 
    } 

    @Override 
    public Object getItem(int i) { 

     return matrixList.get(i); 
    } 

    @Override 
    public long getItemId(int i) { 

     return i; 
    } 

    @Override 
    public View getView(int i, View view, ViewGroup viewGroup) { 
     View v=View.inflate(context,R.layout.grid_item,null); 
     return v; 
    } 
} 

和矩阵类：

public class Matrix { 
    public int i; 
    public int j; 
    public Matrix(int i, int j) 
    { 
     this.i = i; 
     this.j = j; 
    } 
} 

最后，这里是我要从GridView中的每个EditText获取值的Java代码，但我不知道该怎么做：

private MatrixAdapter adapter; 
private List<Matrix> matrixList; 
private int rows; 
private int columns; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_add_subtract_matrix_input); 

    // GET THE MATRIX DIMENSIONS FOR BOTH MATRICES 
    Bundle extras = getIntent().getExtras(); 
    rows = extras.getInt("rows"); 
    columns = extras.getInt("columns"); 

    //MATRIX 1 INPUT 

    // INITIALISE THE GRID 
    GridView grid=(GridView)findViewById(R.id.grid); 
    grid.setNumColumns(columns); 

    // CREATE A LIST OF MATRIX OBJECTS 
    //Or create an EditText[rows][columns] CHANGE INTO THAT LATER 
    //Matrix[][] matrix1 = new Matrix[rows][columns]; 
    matrixList = new ArrayList<>(); //THIS IS ONLY FOR THE MATRIX OF EDIT_TEXTS 
    //Getting the matrix values will come from the user input 

    // ADD SOME CONTENTS TO EACH ITEM 
    for (int i=0;i<rows;i++) 
    { 
     for (int j=0;j<columns;j++) 
     { 
      matrixList.add(new Matrix(i,j)); 
     } 
    } 

    // CREATE AN ADAPTER (MATRIX ADAPTER) 
    adapter = new MatrixAdapter(getApplicationContext(),matrixList); 

    // ATTACH THE ADAPTER TO GRID 
    grid.setAdapter(adapter); 

} 

public void nextMatrix(View view) //The button goes to the next matrix 
{ 
    //It collects what the user inputted too 
    //Checks if one of the fields are empty 
    //But how to get the values from each EditText? 

} 

public void setEmptyToZero(View view) //Fills the empty text boxes to zero 
{ 
    //how to make the program add zeros to the text fields? 
    //iterate through the textField matrix first. If an empty field is 
    //found, add zero to it 

    EditText textField; 
    boolean fieldIsEmpty; 
    for (int i=0;i<rows;i++) 
    { 
     for (int j=0;j<columns;j++) 
     { 
      //How to get values from the EditText Matrix? 
     } 
    } 
} 

Answer 1

我希望这个代码将会帮助你，

@Override 
public View getView(int position, View convertView, ViewGroup parent) { 
ViewHolder viewHolder; 

if (convertView == null) { 
    convertView = LayoutInflater.from(context).inflate(R.layout.R.layout.grid_item, parent, false); 
    viewHolder = new ViewHolder(convertView); 
    convertView.setTag(viewHolder); 
} else { 
    viewHolder = (ViewHolder) convertView.getTag(); 
} 

Item currentItem = (Item) getItem(position); 
viewHolder.itemName.setText(currentItem.getItemName()); // if already in your list: 

return convertView; 

}

私有类ViewHolder { 的EditText ITEMNAME;

public ViewHolder(View view) { 
    itemName = (EditText)view.findViewById(R.id.editText3); 
    itemname.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
      String text = itemName..getText().toString(); 

    } 
    }); 
} 

}

Answer 2

您可以创建一个ArrayList存储的值，并采取任何你想要的。要获取编辑文本的值并将其存储在每个项目的arraylist中，请在编辑文本中使用“TextChangeListener（）”。

检查此链接：

How to use the TextWatcher class in Android?