使用自定义RadioButton和ViewPager实现TabHost效果和带滑动的页卡效果。
在工作中又很多需求都不是android系统自带的控件可以达到效果的，内置的TabHost就是，只能达到简单的效果 ，所以这个时候就要自定义控件来达到效果：这个效果就是： 使用自定义RadioButton和ViewPager实现TabHost带滑动的页卡效果。
好了先上效果图：
以下是实现步骤：
1、准备自定义RadioButton控件的样式图片等，就是准备配置文件：
（1）、 在项目的values文件夹里面创建 attrs.xml ：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="MyRadioButton">
<attr name="pic" format="reference" />
</declare-styleable>
</resources>
（2）、创建 styles.xml:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="radioButtonStyle">
<item name="android:button">@null</item>
<item name="android:textSize">12dip</item>
<item name="android:gravity">center_horizontal|bottom</item>
<item name="android:paddingBottom">5dip</item>
</style>
</resources>
（3）、把中文定义在string.xml里：
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, MainAct!</string>
<string name="app_name">TabHost</string>
<string name="home">大厅</string>
<string name="account">用户</string>
<string name="beanExchange">玩具</string>
<string name="winAcciche">公告</string>
<string name="more">更多</string>
</resources>
（4）、 创建MyRadioButton类继承RadioButton：
package com.dome.viewer.widget;
import com.dome.viewer.R;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.NinePatchDrawable;
import android.util.AttributeSet;
import android.widget.RadioButton;
public class MyRadioButton extends RadioButton {
private Drawable drawable;
public MyRadioButton(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MyRadioButton);
drawable = a.getDrawable(R.styleable.MyRadioButton_pic);
}
//Drawable转换成Bitmap
private Bitmap drawable2Bitmap(Drawable drawable) {
if (drawable instanceof BitmapDrawable) {
return ((BitmapDrawable) drawable).getBitmap();
} else if (drawable instanceof NinePatchDrawable) {
Bitmap bitmap = Bitmap
.createBitmap(
drawable.getIntrinsicWidth(),
drawable.getIntrinsicHeight(),
drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888
: Bitmap.Config.RGB_565);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());
drawable.draw(canvas);
return bitmap;
} else {
return null;
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Bitmap image = drawable2Bitmap(drawable);
if (image != null) {
Paint pt = new Paint();
pt.setARGB(255, 66, 66, 66);
// 消除锯齿
pt.setAntiAlias(true);
// 居中显示图片
int imageX = (int) (this.getWidth() - image.getWidth()) / 2;
canvas.drawBitmap(image, imageX, 2, pt);
pt.setARGB(255, 255, 255, 255);
}
}
}
（5）、为Activity准备布局文件，命名为：tabhost.xml：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:attrstest="http://schemas.android.com/apk/res/com.dome.viewer"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/bg" >
<RelativeLayout
android:id="@+id/title"
android:layout_width="fill_parent"
android:layout_height="50dip"
android:background="@drawable/bg_navigation" >
<TextView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_centerVertical="true"
android:layout_marginLeft="5dip"
android:gravity="center"
android:text="首页"
android:textSize="25dip" />
</RelativeLayout>
<android.support.v4.view.ViewPager
android:id="@+id/vPager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center"
android:paddingBottom="55dip"
android:persistentDrawingCache="animation" />
<RadioGroup
android:id="@+id/rg_main_btns"
android:layout_width="fill_parent"
android:layout_height="50dip"
android:layout_alignParentBottom="true"
android:layout_gravity="bottom"
android:background="@drawable/bg_navigation"
android:gravity="center_horizontal"
android:orientation="horizontal" >
<com.dome.viewer.widget.MyRadioButton
android:id="@+id/buyHomeTab"
style="@style/radioButtonStyle"
android:layout_width="60dip"
android:layout_height="50dip"
android:background="@drawable/navigation_item"
android:checked="true"
attrstest:pic="@drawable/gcdt"
android:text="@string/home" />
<com.dome.viewer.widget.MyRadioButton
android:id="@+id/winAfficheTab"
style="@style/radioButtonStyle"
android:layout_width="60dip"
android:layout_height="50dip"
android:background="@drawable/navigation_item"
android:button="@null"
attrstest:pic="@drawable/kjgg"
android:text="@string/winAcciche" />
<com.dome.viewer.widget.MyRadioButton
android:id="@+id/integralTab"
style="@style/radioButtonStyle"
android:layout_width="65dip"
android:layout_height="50dip"
android:background="@drawable/navigation_item"
attrstest:pic="@drawable/jfdh"
android:text="@string/beanExchange" />
<com.dome.viewer.widget.MyRadioButton
android:id="@+id/accountTab"
style="@style/radioButtonStyle"
android:layout_width="60dip"
android:layout_height="50dip"
android:background="@drawable/navigation_item"
attrstest:pic="@drawable/yhzx"
android:text="@string/account" />
<com.dome.viewer.widget.MyRadioButton
android:id="@+id/moreTab"
style="@style/radioButtonStyle"
android:layout_width="60dip"
android:layout_height="50dip"
android:background="@drawable/navigation_item"
attrstest:pic="@drawable/more"
android:text="@string/more" />
</RadioGroup>
</RelativeLayout>
（6）、创建TabHostActivity：
package com.dome.viewer; import java.util.ArrayList; import java.util.List; import android.app.Activity; import android.app.LocalActivityManager; import android.content.Intent; import android.os.Bundle; import android.os.Parcelable; import android.support.v4.view.PagerAdapter; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.util.Log; import android.view.View; import android.view.Window; import android.widget.RadioGroup; public class TabHostActivity extends Activity { @Override protected void onStart() { super.onStart(); } private RadioGroup radioGroup; // 页卡内容 private ViewPager mPager; // Tab页面列表 private List<View> listViews; // 当前页卡编号 private LocalActivityManager manager = null; private MyPagerAdapter mpAdapter = null; private int index; // 更新intent传过来的值 @Override protected void onNewIntent(Intent intent) { setIntent(intent); } @Override protected void onSaveInstanceState(Bundle outState) { } @Override public void onBackPressed() { Log.i("","onBackPressed()"); super.onBackPressed(); } @Override protected void onPause() { Log.i("","onPause()"); super.onPause(); } @Override protected void onStop() { Log.i("","onStop()"); super.onStop(); } @Override protected void onDestroy() { Log.i("","onDestroy()"); super.onDestroy(); } @Override protected void onResume() { super.onResume(); if(getIntent() != null){ index = getIntent().getIntExtra("index", 0); mPager.setCurrentItem(index); setIntent(null); }else{ if(index < 4){ index = index+1; mPager.setCurrentItem(index); index = index -1; mPager.setCurrentItem(index); }else if(index == 4){ index= index-1; mPager.setCurrentItem(index); index = index +1; mPager.setCurrentItem(index); } } } @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.tabhost); mPager = (ViewPager) findViewById(R.id.vPager); manager = new LocalActivityManager(this, true); manager.dispatchCreate(savedInstanceState); InitViewPager(); radioGroup = (RadioGroup) this.findViewById(R.id.rg_main_btns); radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { public void onCheckedChanged(RadioGroup group, int checkedId) { switch (checkedId) { case R.id.buyHomeTab: index = 0; listViews.set(0, getView("A", new Intent(TabHostActivity.this, OneDomeActivity.class))); mpAdapter.notifyDataSetChanged(); mPager.setCurrentItem(0); break; case R.id.winAfficheTab: index = 1; listViews.set(1, getView("B", new Intent(TabHostActivity.this, TowDomeActivity.class))); mpAdapter.notifyDataSetChanged(); mPager.setCurrentItem(1); break; case R.id.integralTab: index = 2; listViews.set(2, getView("C", new Intent(TabHostActivity.this, ThreeDomeActivity.class))); mpAdapter.notifyDataSetChanged(); mPager.setCurrentItem(2); break; case R.id.accountTab: index = 3; listViews.set(3, getView("D", new Intent(TabHostActivity.this, FourDomeActivity.class))); mpAdapter.notifyDataSetChanged(); mPager.setCurrentItem(3); break; case R.id.moreTab: index = 4; listViews.set(4, getView("E", new Intent(TabHostActivity.this, FiveDomeActivity.class))); mpAdapter.notifyDataSetChanged(); mPager.setCurrentItem(4); break; default: break; } } }); } /** * 初始化ViewPager */ private void InitViewPager() { Intent intent = null; listViews = new ArrayList<View>(); mpAdapter = new MyPagerAdapter(listViews); intent = new Intent(TabHostActivity.this, OneDomeActivity.class); listViews.add(getView("A", intent)); intent = new Intent(TabHostActivity.this, TowDomeActivity.class); listViews.add(getView("B", intent)); intent = new Intent(TabHostActivity.this, ThreeDomeActivity.class); listViews.add(getView("C", intent)); intent = new Intent(TabHostActivity.this, FourDomeActivity.class); listViews.add(getView("D", intent)); intent = new Intent(TabHostActivity.this, FiveDomeActivity.class); listViews.add(getView("E", intent)); mPager.setOffscreenPageLimit(0); mPager.setAdapter(mpAdapter); mPager.setCurrentItem(0); mPager.setOnPageChangeListener(new MyOnPageChangeListener()); } /** * ViewPager适配器 */ public class MyPagerAdapter extends PagerAdapter { public List<View> mListViews; public MyPagerAdapter(List<View> mListViews) { this.mListViews = mListViews; } @Override public void destroyItem(View arg0, int arg1, Object arg2) { ((ViewPager) arg0).removeView(mListViews.get(arg1)); } @Override public void finishUpdate(View arg0) { } @Override public int getCount() { return mListViews.size(); } @Override public Object instantiateItem(View arg0, int arg1) { ((ViewPager) arg0).addView(mListViews.get(arg1), 0); return mListViews.get(arg1); } @Override public boolean isViewFromObject(View arg0, Object arg1) { return arg0 == (arg1); } @Override public void restoreState(Parcelable arg0, ClassLoader arg1) { } @Override public Parcelable saveState() { return null; } @Override public void startUpdate(View arg0) { } } /** * 页卡切换监听，ViewPager改变同样改变TabHost内容 */ public class MyOnPageChangeListener implements OnPageChangeListener { public void onPageSelected(int arg0) { manager.dispatchResume(); switch (arg0) { case 0: index = 0; radioGroup.check(R.id.buyHomeTab); listViews.set(0, getView("A", new Intent(TabHostActivity.this, OneDomeActivity.class))); mpAdapter.notifyDataSetChanged(); break; case 1: index = 1; radioGroup.check(R.id.winAfficheTab); listViews.set(1, getView("B", new Intent(TabHostActivity.this, TowDomeActivity.class))); mpAdapter.notifyDataSetChanged(); break; case 2: index = 2; radioGroup.check(R.id.integralTab); listViews.set(2, getView("C", new Intent(TabHostActivity.this, ThreeDomeActivity.class))); mpAdapter.notifyDataSetChanged(); break; case 3: index = 3; radioGroup.check(R.id.accountTab); listViews.set(3, getView("D", new Intent(TabHostActivity.this, FourDomeActivity.class))); mpAdapter.notifyDataSetChanged(); break; case 4: index = 4; radioGroup.check(R.id.moreTab); listViews.set(4, getView("E", new Intent(TabHostActivity.this, FiveDomeActivity.class))); mpAdapter.notifyDataSetChanged(); break; } } public void onPageScrolled(int arg0, float arg1, int arg2) { } public void onPageScrollStateChanged(int arg0) { } } private View getView(String id, Intent intent) { return manager.startActivity(id, intent).getDecorView(); } }
（7）、然后依次创建5个Activity作为页卡,和创建5个xml作为Activity的布局文件，如图：
