安全手机卫士（3）--GridView&背景选择器

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>