如何以编程方式将 android:layout_columnWeight="1" 设置为 android 支持 v7 Gridlayout 中的元素

Question

我正在尝试以编程方式构建一个包含 2 列的 GirdLayout，并且我希望这些列的宽度相等，设置为屏幕宽度的一半。

我发现您可以从 API 21 或支持 v7 GirdLayout 视图开始执行此操作。我看到使用 android:layout_columnWeight="1" 来执行此操作的示例。但我找不到如何以编程方式执行此操作。

谁能帮我解决这个问题？

package com.tunify.v3.component;

import java.util.ArrayList;

import android.support.v7.widget.GridLayout;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.ViewGroup;

import com.tunify.asme.data.ChangeableSelectionParameterValue;

public class ChangeableSelectionParameters extends GridLayout{

//private ArrayList<ChangeableSelectionParameterView> selectionParameterViews;
private ArrayList<ChangeableSelectionParameterValue> selectionParameterValues;

private static final int ITEM_PADDING_LEFT_DP = 0;
private static final int ITEM_PADDING_RIGHT_DP = 0;
private static final int ITEM_PADDING_TOP_DP = 0;
private static final int ITEM_PADDING_BOTTOM_DP = 0;

//private static final int MUSICCOLLECTION_DISPLAY_TEXT_SIZE_SP = 15;


public ChangeableSelectionParameters(android.content.Context context, ArrayList<ChangeableSelectionParameterValue> selectionParameterValues) {
    super(context);

    this.selectionParameterValues = selectionParameterValues;

    initializeLayoutBasics(context);
    initializeComponents();
}

private void initializeLayoutBasics(android.content.Context context) {
    setOrientation(VERTICAL);
    setColumnCount(2);
    setRowCount((int)Math.ceil(selectionParameterValues.size()/2.0));

    int width = ViewGroup.LayoutParams.MATCH_PARENT;
    int height = ViewGroup.LayoutParams.WRAP_CONTENT;
    android.view.ViewGroup.LayoutParams layoutParams = new android.view.ViewGroup.LayoutParams(width, height);
    this.setLayoutParams(layoutParams);

    DisplayMetrics metrics = getResources().getDisplayMetrics();

    int paddingLeftPx = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, ITEM_PADDING_LEFT_DP, metrics);
    int paddingRightPx = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, ITEM_PADDING_RIGHT_DP, metrics);
    int paddingTopPx = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, ITEM_PADDING_TOP_DP, metrics);
    int paddingBottomPx = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, ITEM_PADDING_BOTTOM_DP, metrics);
    setPadding(paddingLeftPx, paddingTopPx, paddingRightPx, paddingBottomPx);

}

private void initializeComponents() {

    for(ChangeableSelectionParameterValue param : this.selectionParameterValues){
        ChangeableSelectionParameterView v = new ChangeableSelectionParameterView(getContext(), param);
        //TODO set views layout column weight to 1
        this.addView(v);
    }
 }
}

解决方案：

 GridLayout.LayoutParams parem = new LayoutParams(GridLayout.spec(GridLayout.UNDEFINED, 1f),      GridLayout.spec(GridLayout.UNDEFINED, 1f));
 v.setLayoutParams(parem);

Answer 1

我从 GridLayout 中找到了这个方法：http://grepcode.com/file/repository.grepcode.com/java/ext/com.google.android/android/5.0.0_r1/android/widget/GridLayout.java#GridLayout.spec%28int%2Cfloat%29

所以也许你可以尝试这样的事情：

((GridLayout.LayoutParams) this.getLayoutParams()).columnSpec =
    GridLayout.spec(GridLayout.UNDEFINED, 1f);

Answer 2

-给你！ :>

Button button = new Button(this);
GridLayout.LayoutParams param= new GridLayout.LayoutParams(GridLayout.spec(
            GridLayout.UNDEFINED,GridLayout.FILL,1f),
            GridLayout.spec(GridLayout.UNDEFINED,GridLayout.FILL,1f));
param.height = 0;                                                                                                           
param.width = 0;
button.setLayoutParams(param);

Answer 3

对于使用 xamarin.android 的任何人，这些答案对我有所帮助，但我不得不稍微更改语法。因此，如果其他人使用 xamarin.android，语法如下：

GridLayout.LayoutParams param = new GridLayout.LayoutParams();
param.RowSpec = GridLayout.InvokeSpec(GridLayout.Undefined, 1f);
param.ColumnSpec = GridLayout.InvokeSpec(GridLayout.Undefined, 1f);
view.LayoutParameters = param;

view 是 GridLayout 中包含的视图。

Answer 4

GridLayout.Spec 的这个功能可以让你正确设置权重：

public static Spec spec(int start, int size, Alignment alignment, float weight)
public static Spec spec(int start, Alignment alignment, float weight)
public static Spec spec(int start, int size, float weight) 
public static Spec spec(int start, float weight)

用法示例：

((LayoutParams) gm.getViewFromGridCoords(i, j).getLayoutParams()).columnSpec = GridLayout.spec(j, span, CENTER, 1);

Answer 5

我遇到了同样的问题并尝试了很多东西。 我需要的设计如下。

最后，我通过以下方法解决了这个问题。

我将网格布局添加到我的 xml 文件中，如下所示

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
            <GridLayout
                android:id="@+id/gridLayoutBillingInfo"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:columnCount="2">
            </GridLayout>
</RelativeLayout>

然后我为网格布局中的每个项目创建了一个自定义布局。仅添加 textview 不起作用，但是当将 textview 放入布局中时，它可以工作。 见下文-

 public class ItemLayout : LinearLayout {

  constructor(context: Context, text:String) :super(context){

    this.orientation = HORIZONTAL
    this.gravity = Gravity.CENTER_VERTICAL


    val param = GridLayout.LayoutParams(
        GridLayout.spec(
            GridLayout.UNDEFINED, GridLayout.FILL, 1f
        ),
        GridLayout.spec(GridLayout.UNDEFINED, GridLayout.FILL, 1f)
    )
    param.height = ViewGroup.LayoutParams.WRAP_CONTENT
    param.width = 0

    this.layoutParams = param

    var textView = TextView(context)
    textView.setText(text)

    this.addView(textView)

  }
}

最后将此项目添加到带有数据的网格布局中。 见下文-

   fun addDataToGridLayout{

    val gridLayoutBillingInfo = findViewById<GridLayout>(R.id.gridLayoutBillingInfo)

    val billDetailList : ArrayList<String> = ArrayList()

    billDetailList.add("test data 1")
    billDetailList.add("test data 2")
    billDetailList.add("test data 3")
    billDetailList.add("test data 4")
    billDetailList.add("test data 5")
    billDetailList.add("test data 6")

    billDetailList.forEach {
      gridLayoutBillingInfo.addView(BillItemLayout(context,it))
        
   }

}

我希望它会有所帮助。