Android 仿微信之(二)--主页面实现篇

  这一篇将讲述如何构建主页面,先看一下微信主页面的截图

Android 仿微信之(二)--主页面实现篇_第1张图片

  从截图中可以看出,它的菜单是在程序的底部,当我们选择一个按钮后,它的颜色会发生变化,好像有灯在亮,这个实现起来比较简单,可以有多种方式供我们选择,TabActivity或者tabwidget+radiobutton或者activitygroup+radiobutton或者activitygroup+gridview或者activitygroup+grally等都可以,按钮的变化可以使用selector用两张图片来控制。

关于activitygroup,大家可以看一下这个图片:

Android 仿微信之(二)--主页面实现篇_第2张图片

先以tabwidget为例,代码如下:

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TabHost;
import android.widget.TextView;

public class MainActivity extends TabActivity {
    /** Called when the activity is first created. */
	private TabHost tabHost;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        this.requestWindowFeature(Window.FEATURE_NO_TITLE);
        setContentView(R.layout.main);
             
        tabHost=this.getTabHost();
        TabHost.TabSpec spec;
        Intent intent;

        intent=new Intent().setClass(this, AddExamActivity.class);
        spec=tabHost.newTabSpec("微信").setIndicator("微信").setContent(intent);
        tabHost.addTab(spec);
        
        intent=new Intent().setClass(this,MyExamActivity.class);
        spec=tabHost.newTabSpec("通讯录").setIndicator("通讯录").setContent(intent);
        tabHost.addTab(spec);
        
        intent=new Intent().setClass(this, MyMessageActivity.class);
        spec=tabHost.newTabSpec("朋友们").setIndicator("朋友们").setContent(intent);
        tabHost.addTab(spec);
        
        intent=new Intent().setClass(this, Activity.class);
        spec=tabHost.newTabSpec("设置").setIndicator("设置").setContent(intent);
        tabHost.addTab(spec);

        intent=new Intent().setClass(this, SettingActivity.class);
        spec=tabHost.newTabSpec("设置").setIndicator("设置").setContent(intent);
        tabHost.addTab(spec);

        tabHost.setCurrentTab(1);       
    }  
}
xml布局文件如下:

<?xml version="1.0" encoding="utf-8"?>
<TabHost 
    android:id="@android:id/tabhost" //id必须为:tabhost
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"
    xmlns:android="http://schemas.android.com/apk/res/android">
    
    <LinearLayout 
        android:orientation="vertical" 
        android:layout_width="fill_parent" 
        android:layout_height="fill_parent">
        
        <FrameLayout 
            android:id="@android:id/tabcontent" //id必须为:tabcontent
            android:layout_width="fill_parent" 
            android:layout_height="0.0dip" 
            android:layout_weight="1.0" />
        
        <TabWidget 
            android:id="@android:id/tabs" //id必须为:tabs    
            android:layout_width="fill_parent" 
            android:layout_height="wrap_content" 
            android:layout_weight="0.0" />
            
    </LinearLayout>        这些id都是系统的,只有这样,系统才会找到他们正确辨认。
    
</TabHost>
  再就是点击button的切换效果了,这里需要使用selector来实现,如下:

<?xml version="1.0" encoding="utf-8"?>
<selector
  xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_enabled="true" android:state_checked="true" android:drawable="@drawable/tab_weixin_pressed" />//点击后的绿色效果
    <item android:drawable="@drawable/tab_weixin_normal" />//未点击的正常效果
</selector>
  这样就利用tabwidget实现了最基础的菜单布局,但是相信很多人都知道,使用tabwidget需要消耗比较大的内存,后来就有人使用activitygroup和其他的组件结合使用,如上举例。这里就不再介绍了,感兴趣的朋友可以去查阅资料。下面我们使用另外一个方法,这种方法相对来说更加优雅。为什么这么说,因为viewpager这个类相信大家都不陌生了,其实官方微信是不支持滑动页面的,但是利用viewpager这个类,我们也可以既可以点击又可以滑动的切换页面。而且我们也不使用selector来实现button的改变,而是利用一个动画来实现,这个工程就是绿色图片来覆盖各个button,呈现出一个绿色的效果。底部菜单也不是使用耗费资源的tabwidget而是利用布局来自定义的,xml文件如下,一眼就可以明白:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/mainweixin"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:background="#eee" >  

    <RelativeLayout
        android:id="@+id/main_bottom"
        android:layout_width="match_parent"
        android:layout_height="55dp"
        android:layout_alignParentBottom="true"
        android:orientation="vertical"
        android:background="@drawable/bottom_bar"
        >             
      
        <ImageView
        	android:id="@+id/img_tab_now"
        	android:layout_width="wrap_content"
        	android:layout_height="wrap_content"        	     	
        	android:scaleType="matrix"
        	android:layout_gravity="bottom"            	
            android:layout_alignParentBottom="true"
        	android:src="@drawable/tab_bg" />   //动画所用图片,绿色的       
         
         <LinearLayout    //底部菜单的父布局
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:paddingBottom="2dp"            
        	>
        	
            <LinearLayout
            	android:layout_width="wrap_content"
            	android:layout_height="wrap_content"
              	android:gravity="center_horizontal"
              	android:orientation="vertical"
              	android:layout_weight="1">               	
                <ImageView
            		android:id="@+id/img_weixin"
        			android:layout_width="wrap_content"
        			android:layout_height="wrap_content"        	     	
        			android:scaleType="matrix"
        			android:clickable="true"
        			android:src="@drawable/tab_weixin_pressed" />
                <TextView
            		android:layout_width="wrap_content"
            		android:layout_height="wrap_content"
            		android:text="微信"
            		android:textColor="#fff"
            		android:textSize="12sp" />                
        	 </LinearLayout>
        	 <LinearLayout
            	android:layout_width="wrap_content"
            	android:layout_height="wrap_content"
              	android:gravity="center_horizontal"
              	android:orientation="vertical"
              	android:layout_weight="1">               	
                <ImageView
            		android:id="@+id/img_address"
        			android:layout_width="wrap_content"
        			android:layout_height="wrap_content"        	     	
        			android:scaleType="matrix"
        			android:clickable="true"
        			android:src="@drawable/tab_address_normal" />
                <TextView
            		android:layout_width="wrap_content"
            		android:layout_height="wrap_content"
            		android:text="通讯录"
            		android:textColor="#fff"
            		android:textSize="12sp" />                
        	 </LinearLayout>
        	 <LinearLayout
            	android:layout_width="wrap_content"
            	android:layout_height="wrap_content"
              	android:gravity="center_horizontal"
              	android:orientation="vertical"
              	android:layout_weight="1">               	
                <ImageView
            		android:id="@+id/img_friends"
        			android:layout_width="wrap_content"
        			android:layout_height="wrap_content"        	     	
        			android:scaleType="matrix"
        			android:clickable="true"
        			android:src="@drawable/tab_find_frd_normal" />
                <TextView
            		android:layout_width="wrap_content"
            		android:layout_height="wrap_content"
            		android:text="朋友们"
            		android:textColor="#fff"
            		android:textSize="12sp" />                
        	 </LinearLayout>
        	 
        	 <LinearLayout
            	android:layout_width="wrap_content"
            	android:layout_height="wrap_content"
              	android:gravity="center_horizontal"
              	android:orientation="vertical"
              	android:layout_weight="1">               	
                <ImageView
            		android:id="@+id/img_settings"
        			android:layout_width="wrap_content"
        			android:layout_height="wrap_content"        	     	
        			android:scaleType="matrix"
        			android:clickable="true"
        			android:src="@drawable/tab_settings_normal" />
                <TextView
            		android:layout_width="wrap_content"
            		android:layout_height="wrap_content"
            		android:text="设置"
            		android:textColor="#fff"
            		android:textSize="12sp" />                
        	 </LinearLayout>        
          
        </LinearLayout>     
       
    </RelativeLayout>

    <LinearLayout  //viewpager类,用来切换页面
        android:layout_width="fill_parent"
    	android:layout_height="wrap_content" 
    	android:layout_alignParentTop="true"
    	android:layout_above="@id/main_bottom"       
        android:orientation="vertical" >
        
        <android.support.v4.view.ViewPager
        	android:id="@+id/tabpager"
        	android:layout_width="wrap_content"
        	android:layout_height="wrap_content"
        	android:layout_gravity="center" > 
        </android.support.v4.view.ViewPager>  
    </LinearLayout>

</RelativeLayout>
 如图:


  所以,主页面的代码主要是这样的,一方面要使用viewpager来实现滑动页面,另一方面要实现自定义菜单改变颜色的动画效果。代码如下:

  

import java.util.ArrayList;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.Display;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.view.WindowManager.LayoutParams;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.PopupWindow;

public class MainWeixin extends Activity {

	public static MainWeixin instance = null;

	private ViewPager mTabPager;//声明对象
	private ImageView mTabImg;// 动画图片
	private ImageView mTab1, mTab2, mTab3, mTab4;
	private int zero = 0;// 动画图片偏移量
	private int currIndex = 0;// 当前页卡编号
	private int one;// 单个水平动画位移
	private int two;
	private int three;
	private LinearLayout mClose;
	private LinearLayout mCloseBtn;
	private View layout;
	private boolean menu_display = false;
	private PopupWindow menuWindow;
	private LayoutInflater inflater;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main_weixin);
		getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);// 启动activity时不自动弹出软键盘
		instance = this;

		mTabPager = (ViewPager) findViewById(R.id.tabpager);
		mTabPager.setOnPageChangeListener(new MyOnPageChangeListener());

		mTab1 = (ImageView) findViewById(R.id.img_weixin);
		mTab2 = (ImageView) findViewById(R.id.img_address);
		mTab3 = (ImageView) findViewById(R.id.img_friends);
		mTab4 = (ImageView) findViewById(R.id.img_settings);

		mTabImg = (ImageView) findViewById(R.id.img_tab_now);//动画图片

		mTab1.setOnClickListener(new MyOnClickListener(0));
		mTab2.setOnClickListener(new MyOnClickListener(1));
		mTab3.setOnClickListener(new MyOnClickListener(2));
		mTab4.setOnClickListener(new MyOnClickListener(3));

		Display currDisplay = getWindowManager().getDefaultDisplay();// 获取屏幕当前分辨率
		int displayWidth = currDisplay.getWidth();
		one = displayWidth / 4; // 设置水平动画平移大小
		two = one * 2;
		three = one * 3;

		// 将要分页显示的View装入数组中
		LayoutInflater mLi = LayoutInflater.from(this);
		View view1 = mLi.inflate(R.layout.main_tab_weixin, null);
		View view2 = mLi.inflate(R.layout.main_tab_address, null);
		View view3 = mLi.inflate(R.layout.main_tab_friends, null);
		View view4 = mLi.inflate(R.layout.main_tab_settings, null);

		// 每个页面的view数据
		final ArrayList<View> views = new ArrayList<View>();
		views.add(view1);
		views.add(view2);
		views.add(view3);
		views.add(view4);

		// 填充ViewPager的数据适配器
		PagerAdapter mPagerAdapter = new PagerAdapter() {

			@Override
			public boolean isViewFromObject(View arg0, Object arg1) {
				return arg0 == arg1;
			}

			@Override
			public int getCount() {
				return views.size();
			}

			@Override
			public void destroyItem(View container, int position, Object object) {
				((ViewPager) container).removeView(views.get(position));
			}

			// @Override
			// public CharSequence getPageTitle(int position) {
			// return titles.get(position);
			// }

			@Override
			public Object instantiateItem(View container, int position) {
				((ViewPager) container).addView(views.get(position));
				return views.get(position);
			}
		};

		mTabPager.setAdapter(mPagerAdapter);
	}

	/**
	 * 头标点击监听
	 */
	public class MyOnClickListener implements View.OnClickListener {
		private int index = 0;

		public MyOnClickListener(int i) {
			index = i;
		}

		public void onClick(View v) {
			mTabPager.setCurrentItem(index);
		}
	};

	/*
	 * 页卡切换监听(原作者:D.Winter)
	 */
	public class MyOnPageChangeListener implements OnPageChangeListener {
		public void onPageSelected(int arg0) {
			Animation animation = null;
			switch (arg0) {
			case 0:
				mTab1.setImageDrawable(getResources().getDrawable(
						R.drawable.tab_weixin_pressed));
				if (currIndex == 1) {
					animation = new TranslateAnimation(one, 0, 0, 0);
					mTab2.setImageDrawable(getResources().getDrawable(
							R.drawable.tab_address_normal));
				} else if (currIndex == 2) {
					animation = new TranslateAnimation(two, 0, 0, 0);
					mTab3.setImageDrawable(getResources().getDrawable(
							R.drawable.tab_find_frd_normal));
				} else if (currIndex == 3) {
					animation = new TranslateAnimation(three, 0, 0, 0);
					mTab4.setImageDrawable(getResources().getDrawable(
							R.drawable.tab_settings_normal));
				}
				break;
			case 1:
				mTab2.setImageDrawable(getResources().getDrawable(
						R.drawable.tab_address_pressed));
				if (currIndex == 0) {
					animation = new TranslateAnimation(zero, one, 0, 0);
					mTab1.setImageDrawable(getResources().getDrawable(
							R.drawable.tab_weixin_normal));
				} else if (currIndex == 2) {
					animation = new TranslateAnimation(two, one, 0, 0);
					mTab3.setImageDrawable(getResources().getDrawable(
							R.drawable.tab_find_frd_normal));
				} else if (currIndex == 3) {
					animation = new TranslateAnimation(three, one, 0, 0);
					mTab4.setImageDrawable(getResources().getDrawable(
							R.drawable.tab_settings_normal));
				}
				break;
			case 2:
				mTab3.setImageDrawable(getResources().getDrawable(
						R.drawable.tab_find_frd_pressed));
				if (currIndex == 0) {
					animation = new TranslateAnimation(zero, two, 0, 0);
					mTab1.setImageDrawable(getResources().getDrawable(
							R.drawable.tab_weixin_normal));
				} else if (currIndex == 1) {
					animation = new TranslateAnimation(one, two, 0, 0);
					mTab2.setImageDrawable(getResources().getDrawable(
							R.drawable.tab_address_normal));
				} else if (currIndex == 3) {
					animation = new TranslateAnimation(three, two, 0, 0);
					mTab4.setImageDrawable(getResources().getDrawable(
							R.drawable.tab_settings_normal));
				}
				break;
			case 3:
				mTab4.setImageDrawable(getResources().getDrawable(
						R.drawable.tab_settings_pressed));
				if (currIndex == 0) {
					animation = new TranslateAnimation(zero, three, 0, 0);
					mTab1.setImageDrawable(getResources().getDrawable(
							R.drawable.tab_weixin_normal));
				} else if (currIndex == 1) {
					animation = new TranslateAnimation(one, three, 0, 0);
					mTab2.setImageDrawable(getResources().getDrawable(
							R.drawable.tab_address_normal));
				} else if (currIndex == 2) {
					animation = new TranslateAnimation(two, three, 0, 0);
					mTab3.setImageDrawable(getResources().getDrawable(
							R.drawable.tab_find_frd_normal));
				}
				break;
			}
			currIndex = arg0;
			animation.setFillAfter(true);// True:图片停在动画结束位置
			animation.setDuration(150);// 动画持续时间
			mTabImg.startAnimation(animation);// 开始动画
		}		
	
}
  效果如下:

  Android 仿微信之(二)--主页面实现篇_第3张图片
  这样关于主页面的实现就完成了,之后会详细说一下各个Activity的实现。欢迎大家关注!

  








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