Android —— 代码优化及常用代码块

Gridview：

grid设置

 <GridView
            android:id="@+id/gridview_cover"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:numColumns="2"
            android:background="@color/transparence"   //背景透明
            android:columnWidth="@dimen/cover_height"
            android:horizontalSpacing="@dimen/cover_space"  //间隔
            android:verticalSpacing="@dimen/cover_space"   
            android:scrollbars="none"
            android:layout_margin="@dimen/cover_space"
            android:stretchMode="columnWidth"
            android:listSelector="@null"      //设置
    />

item设置：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="@dimen/cover_height"
                android:background="@drawable/list_item_select">
    <ImageView
            android:id="@+id/button_cover"
            android:layout_width="match_parent"
            android:layout_height="@dimen/cover_height"
            android:background="@drawable/cover_one"
            android:scaleType="centerCrop"
    />
    <ImageView
            android:id="@+id/img_select_cover_complete"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:layout_marginRight="@dimen/cover_boundary_space"
            android:layout_marginTop="@dimen/cover_boundary_space"
            android:src="@drawable/icon_vote_selected"/>


</RelativeLayout>

当gridview透明，在item中设置点击态才有用。

通过名称获得图片资源

/** * 根据图片名称获取R.java中对应的id * * @param name * @return */
    public static int getImageIdByName (String name) {
        int value = 0;
        if (null != name) {
            if (name.indexOf(".") != -1) {
                name = name.substring(0, name.indexOf("."));
            }
            Class<com.example.washcarproject.R.mipmap> cls = R.mipmap.class;
            try {
                value = cls.getDeclaredField(name).getInt(null);
            } catch (Exception e) {

            }
        }
        return value;
    }