安全手机卫士（3）--GridView&背景选择器

最新推荐文章于 2020-05-31 23:10:48 发布

原创最新推荐文章于 2020-05-31 23:10:48 发布 · 594 阅读

0 ·

CC 4.0 BY-SA版权

手机安全卫士知识点整理专栏收录该内容

4 篇文章

订阅专栏

本文详细介绍了Android中GridView布局的使用方法，包括属性解析如listSelector背景选择器、间距设置等，并提供了自定义适配器的具体实现及界面布局代码。

由于主界面采用的是九宫格的布局，所以很容易想到GridView布局，这里了解gridview的属性。

listSelector 背景选择器，当我们点击某一个item时，背景发生变化

也可以在自定义item的界面布局设置backgroud

android:background="@drawable/button_selector"

verticalSpacing="10dip" 两行之间的间距

horizontalSpacing="10dip" 两列之间的间距

numColumns="3" 3列

<span style="font-size:18px;"> <GridView
       <span style="color:#cc0000;"> android:listSelector="@drawable/button_selector"</span>
        android:id="@+id/gv_main"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:horizontalSpacing="10dip"
        android:numColumns="3"
        android:verticalSpacing="10dip" >
    </GridView></span>

adapte 程序：

<span style="font-size:18px;">package cn.itcast.modify.adapter;

import android.content.Context;
import android.content.SharedPreferences;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import cn.itcast.modifysafe.R;

public class MainUiAdapter extends BaseAdapter {

	private static final String TAG = "MainUiAdapter";
	private Context mContext;
	private LayoutInflater inflater;
	private static ImageView iv_icon;
	private static TextView tv_name;
	private SharedPreferences sp;

	public MainUiAdapter(Context mContext) {
		this.mContext = mContext;
		inflater = LayoutInflater.from(mContext);
		sp = mContext.getSharedPreferences("config", Context.MODE_PRIVATE);
	}

	private static String[] names = { "手机防盗", "通讯卫士", "软件管理", "任务管理", "流量管理",
			"手机杀毒", "系统优化", "高级工具", "设置中心" };
	private static int[] icons = { R.drawable.widget05, R.drawable.widget02,
			R.drawable.widget01, R.drawable.widget07, R.drawable.widget05,
			R.drawable.widget04, R.drawable.widget06, R.drawable.widget03,
			R.drawable.widget08 };

	@Override
	public int getCount() {

		return names.length;
	}

	@Override
	public Object getItem(int arg0) {

		return arg0;
	}

	@Override
	public long getItemId(int position) {

		return position;
	}

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

		Log.i(TAG, "getview" + position);
		View view = inflater.inflate(R.layout.mainscreen_item, null);

		// 使用静态优化
		iv_icon = (ImageView) view.findViewById(R.id.iv_main_icon);
		tv_name = (TextView) view.findViewById(R.id.tv_main_function);

		iv_icon.setImageResource(icons[position]);
		tv_name.setText(names[position]);

		if (position == 0) {
			String name = sp.getString("new_name", null);
			if (name != null) {
				tv_name.setText(name);
			}
		}

		return view;
	}

}
</span>

adapte对应的界面布局

<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="100dip"
    android:layout_height="100dip"
    android:gravity="center_horizontal"
   <span style="color:#ff0000;"> android:background="@drawable/button_selector"</span>
    android:orientation="vertical" >

    <ImageView
        android:id="@+id/iv_main_icon"
        android:layout_width="60dip"
        android:layout_height="60dip"
        android:scaleType="fitXY"
        android:src="@drawable/widget01" />

    <TextView
        android:id="@+id/tv_main_function"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="功能名字"
        android:textColor="@color/text_color"
        android:textSize="18sp" />

</LinearLayout></span>