安卓项目回顾(二)

第二天：

任务一：给某个屏幕设置淡入淡出效果

//进行淡入淡出的效果

initAnimation();

private void initAnimation() {

// TODO 自动生成的方法存根

AlphaAnimation alphaAnimation = new AlphaAnimation(0, 1);//透明度

alphaAnimation.setDuration(3000);//设置时长

rl_root.startAnimation(alphaAnimation);

}

private void initUI() {

// TODO 自动生成的方法存根

tv_version_name = (TextView) findViewById(R.id.tv_version_name);

rl_root = (RelativeLayout) findViewById(R.id.rl_root);

}

<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"

android:background="@drawable/launcher_bg"

android:id="@+id/rl_root"

tools:context=".SplashActivity" >

ok，对项目的主题进行配置

<!-- Application theme. -->

<style name="AppTheme" parent="AppBaseTheme">

<!-- All customizations that are NOT specific to a particular API-level can go here. -->

</style>

<!-- <TextView

android:text="功能列表"

android:gravity="center"

android:textSize="20sp"

android:textColor="#000"

android:padding="10dp"

android:background="#0f0"

android:layout_width="match_parent"

android:layout_height="wrap_content"/> -->

<style name="TitleStyle">

<item name="android:gravity">center</item>

<item name="android:textSize">20sp</item>

<item name="android:textColor">#000</item>

<item name="android:padding">10dp</item>

<item name="android:background">#0f0</item>

<item name="android:layout_width">match_parent</item>

<item name="android:layout_height">wrap_content</item>

</style>

<TextView

style="@style/TitleStyle"

android:text="功能列表" />

自定义类进行内容的聚焦，用于滚动

import android.content.Context;

import android.util.AttributeSet;

import android.widget.TextView;

public class FocusTextView extends TextView {

//使用在通过java代码创建控件

public FocusTextView(Context context) {

super(context);

}

//由系统调用(带属性+上下文环境构造方法xml to java对象)

public FocusTextView(Context context, AttributeSet attrs) {

super(context, attrs);

}

//由系统调用(带属性+上下文环境构造方法+布局文件中定义样式文件构造方法xml)

public FocusTextView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

}

//这是第二种方法重写获取焦点的方法,由系统调用,调用的时候默认就能获取焦点，比textview好

@Override

public boolean isFocused() {

return true;

}

}

<com.example.moblesafe73.view.FocusTextView

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:ellipsize="marquee"

android:marqueeRepeatLimit="marquee_forever"

android:padding="5dp"

android:singleLine="true"

android:text="秋天秋天悄悄过去,留下小秘密,啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊啊"

android:textColor="#000" >

</com.example.moblesafe73.view.FocusTextView>

开始着手设置九宫格

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:gravity="center"

>

<ImageView

android:id="@+id/iv_icon"

android:background="@drawable/ic_launcher"

android:layout_width="wrap_content"

android:layout_height="wrap_content"/>

<TextView

android:id="@+id/tv_title"

android:text="模块标题"

android:textSize="18sp"

android:layout_width="wrap_content"

android:layout_height="wrap_content"/>

</LinearLayout>

<GridView

android:id="@+id/gv_home"

android:numColumns="3"

android:verticalSpacing="10dp"

android:layout_width="match_parent"

android:layout_height="match_parent" >

</GridView>

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.BaseAdapter;

import android.widget.GridView;

import android.widget.ImageView;

import android.widget.TextView;

public class HomeActivity extends Activity{

private String[] mTitleStrs;

private int[] mDrawableIds;

private GridView gv_home;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_home);

initUI();

//初始化数据的方法

initData();

}

private void initData() {

//准备数据(文字(9组),图片(9张))

mTitleStrs = new String[]{

"手机防盗","通信卫士","软件管理","进程管理","流量统计","手机杀毒","缓存清理","高级工具","设置中心"

};

mDrawableIds = new int[]{

R.drawable.home_safe,R.drawable.home_callmsgsafe,

R.drawable.home_apps,R.drawable.home_taskmanager,

R.drawable.home_netmanager,R.drawable.home_trojan,

R.drawable.home_sysoptimize,R.drawable.home_tools,R.drawable.home_settings

};

//九宫格控件设置数据适配器(等同ListView数据适配器)

gv_home.setAdapter(new MyAdapter());

}

class MyAdapter extends BaseAdapter{

@Override

public int getCount() {

//条目的总数 文字组数 == 图片张数

return mTitleStrs.length;

}

@Override

public Object getItem(int position) {

return mTitleStrs[position];

}

@Override

public long getItemId(int position) {

return position;

}

@Override

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

View view = View.inflate(getApplicationContext(), R.layout.gridview_item, null);

TextView tv_title = (TextView) view.findViewById(R.id.tv_title);

ImageView iv_icon = (ImageView) view.findViewById(R.id.iv_icon);

tv_title.setText(mTitleStrs[position]);

iv_icon.setBackgroundResource(mDrawableIds[position]);

return view;

}

}

private void initUI() {

gv_home = (GridView) findViewById(R.id.gv_home);

}

}