如何管理GridView

Question

我有以下Gridview代码(制作日历).

    <GridView
    android:id="@+id/calendar"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_above="@+id/rl1"
    android:layout_below="@+id/ll2"
    android:columnWidth="250dp"
    android:numColumns="7" >
    </GridView>

Grid_Cell如下.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/calendar_button_selector" >

<Button
    android:id="@+id/calendar_day_gridcell"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/calendar_button_selector"
    android:gravity="center"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:textColor="#000"
    android:textSize="14.47sp" >
</Button>

<TextView
    android:id="@+id/num_events_per_day"
    style="@style/calendar_event_style"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center" >
</TextView>

我想在行和列之间不设置空格.

现有视图如下.

请帮帮我...先谢谢.

Answer 1

我将尝试给您提供一个片段，但说实话，对于您的情况使用 GridView 是没有意义的，因为无论如何您的所有项目都在屏幕上。您可以在一个小循环中创建几个LinearLayouts 来获得结果。

我建议您根据屏幕宽度在运行时设置columnWidth。

并且您的适配器应该提供列的宽度和高度，以便在膨胀子视图时设置它们。在这种情况下，您需要删除 numColumns。请记住，将 numColumns 与 columnWidth 一起使用是没有意义的，尤其是当您想要填充整个空间时。如果要设置 numColumns，请删除 columnWidth。

解决方案：

结果如下： 首先，我们创建布局。就我而言，它是MainActivity的布局，称为activity_main.xml。（请注意，没有 GridView，因为我稍后会在代码中添加它）：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/header"
        android:background="#444"
        android:gravity="center"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:textColor="@android:color/white"
        android:text="Dynamic Static GridView" />

    <TextView
        android:id="@+id/footer"
        android:gravity="center"
        android:background="#444"
        android:textColor="@android:color/white"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Shush" />

</RelativeLayout>

我们的 GridView 元素的布局位于item_grid.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:background="#fff"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

现在技巧就在MainActivity中（我已经注释了一些代码供您理解）：

包 com.example.dynamicstaticgridview;

import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.GridView;
import android.widget.RelativeLayout;
import android.app.Activity;
import android.graphics.Color;

/**
 * @author Sherif elKhatib
 *
 */
public class MainActivity extends Activity {

    private static String items[]; //these are temporary items :p do not use them
    static {
        items = new String[7*7];
        for(int i=0;i<7*7;i++) {
            items[i] = String.valueOf(i);
        }
    }

    int numberOfColumns = 7; //defaulting to 7, you can change it when you know
    int numberOfRows = 7; //defaulting to 7, you can change it when you know
    GridView mGrid;
    ArrayAdapter<String> mAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
        params.addRule(RelativeLayout.BELOW, R.id.header);
        params.addRule(RelativeLayout.ABOVE, R.id.footer);
        mGrid = new GridView(this) {
            @Override
            protected void onLayout(boolean changed, int l, int t, int r, int b) {
                super.onLayout(changed, l, t, r, b);
                if(!calculated)
                    getDimens();
            }
        };
        mGrid.setVerticalSpacing(0);
        mGrid.setHorizontalSpacing(0);
        mGrid.setStretchMode(GridView.NO_STRETCH);
        mGrid.setBackgroundColor(Color.rgb(100, 10, 10));
        ((RelativeLayout)findViewById(R.id.rootview)).addView(mGrid, params);
    }

    private int mCellWidth;
    private int mCellHeight;
    boolean calculated = false;
    protected void getDimens() {
        calculated = true;
        //here you might have some rounding errors
        //thats why you see some padding around the GridView
        mCellWidth = mGrid.getWidth()/numberOfColumns;
        mCellHeight = mGrid.getHeight()/numberOfRows;
        mGrid.setColumnWidth(mCellWidth);
        mGrid.setNumColumns(numberOfColumns);
        mAdapter = new ArrayAdapter<String>(this, R.layout.item_grid, R.id.text, items) {
            @Override
            public View getView(int position, View convertView, ViewGroup parent) {
                GridView.LayoutParams params = null;
                if(convertView == null) {
                    params = new GridView.LayoutParams(mCellWidth, mCellHeight);
                }
                convertView = super.getView(position, convertView, parent);
                if(params != null) {
                    convertView.setLayoutParams(params);
                }
                return convertView;
            }
        };
        mGrid.setAdapter(mAdapter);
    }
}

评论：你最好找到一个像样的算法来选择mCellWidth、mCellHeight、numberOfColumns和numberOfRows。