自定义RadioButton和ViewPager实现TabHost带滑动的页卡效果
作者：
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所以这个时候就要自定义控件来达到效果:使用自定义RadioButton和ViewPager实现TabHost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。
这篇文章技术含量一般，大家别见笑。源码我以测试，在底部可下载。
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 ：
复制代码 代码如下:
<?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:
复制代码 代码如下:
<?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：
复制代码 代码如下:
<?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：
复制代码 代码如下:
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：
复制代码 代码如下:
<?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：
复制代码 代码如下:
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：
