纠结了一天,终于发现的问题.先描述一下吧:

用FragmentTabHost + FragmentActivity 实现了微博的底部Tab,layout布局如下:

<?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" >

    <FrameLayout
        android:id="@+id/realtabcontent"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1" />

    <android.support.v4.app.FragmentTabHost
        android:id="@android:id/tabhost"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true" />

        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </android.support.v4.app.FragmentTabHost>

</LinearLayout>

package com.yuzile.yuzile;

import java.util.Map;

import com.yuzile.yuzile.util.YuziLog;

import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTabHost;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.TabHost.TabSpec;

public class MainActivity extends FragmentActivity {

	private FragmentTabHost mTabHost;

	private final static String[] tags = { "intro", "guide", "artworks",
			"discovery" };
	private final static Class[] tagClasses = { IntroFragment.class,
			GuideFragment.class, ArtworksFragment.class,
			DiscoveryFragment.class };
	private final static String[] tagIndicators = { "简介", "导览", "作品", "发现" };
	private final static int[] tagImages = {
			R.drawable.tab_bar_intro_bg_selector,
			R.drawable.tab_bar_guide_bg_selector,
			R.drawable.tab_bar_artworks_bg_selector,
			R.drawable.tab_bar_discovery_bg_selector };

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main_activity);

		mTabHost = (FragmentTabHost) findViewById(android.R.id.tabhost);

		initTabHost();
	}

	private void initTabHost() {
		mTabHost.setup(this, getSupportFragmentManager(), R.id.realtabcontent);
		findViewById(android.R.id.tabs).setBackgroundResource(
				R.drawable.bottombarbg);
		for (int i = 0; i < tags.length; i++) {
			TabSpec tabSpec = mTabHost.newTabSpec(tags[i]);
			Drawable drawable = getResources().getDrawable(
					R.drawable.tab_bar_intro_bg_selector);
			tabSpec.setIndicator(getIndicatorView(i));
			mTabHost.addTab(tabSpec, tagClasses[i], null);
		}
	}

	private View getIndicatorView(int i) {
		LayoutInflater inflater = getLayoutInflater();
		ViewGroup views = (ViewGroup) inflater.inflate(
				R.layout.tab_widget_item, null);
		ImageView imageView = (ImageView) views
				.findViewById(R.id.tab_widget_item_image);
		TextView textView = (TextView) views
				.findViewById(R.id.tab_widget_item_text);
		imageView.setBackgroundResource(tagImages[i]);
		textView.setText(tagIndicators[i]);
		return views;
	}

}

刚开始一直进行得非常顺利,但是就在今天,我导入了一个Google Map的Library,地图都进行的很顺利,但是在编译的时候提示

Found 2 versions of android-support-v4.jar in the dependency list,

网上有答案说要自定义FragmentTabHost http://*.com/questions/13408709/android-tabs-at-the-bottom-with-fragmenttabhost , 但是我并不像这么做,也没尝试,纠结很久之后,知道是android-support-v4.jar某些版本的Bug引起的,但是我不知道是什么版本,什么版本修好了,官方也没有说明,所以一个思路是找到正确的那个版本,在自己的开发环境新建了一个工程,按照原来的工程配置,但还是一样的错误,我也不知道为什么,也许来大姨妈了. 最后在网上找了一些实例代码下载,先正确运行了,然后偷里面的android-support-v4.jar 替换到项目中,果然可以了,罪魁祸首就是Google Map的android-support-v4.jar ,害得我浪费了一天啊.

后来又崩了,不断提示:

 Found 2 versions of android-support-v4.jar in the dependency list,

but not all the versions are identical (check is based on SHA-1 only at this time).

All versions of the libraries must be the same at this time.

就是这个错误导致了启动的时候找不到Activity,所以必须解决两个不同版本的android-support-v4.jar冲突的问题,解决方法当然是覆盖了...

参考网址:http://code.google.com/p/android/issues/detail?id=53230

No tab content FrameLayout found for id xxxxxxx