自定义TabHost

之前一直认为TabHost不够灵活而使用ActivityGroup。看到了一个利用反射来控制TabHost的例子

先通过

tabHost.newTabSpec(CagConstant.TAB_TAG_CHANGE_INFO);

tabHost.newTabSpec(CagConstant.TAB_TAG_ROUTE_INFO);

tabHost.newTabSpec(CagConstant.TAB_TAG_STATION_INFO);

来获得TabSpec单个按钮的对象，之后setContent(ViewId)来设置选中状态效果。

接下来通过反射

tabWidget.getClass().getDeclaredField("mBottomLeftStrip");

tabWidget.getClass().getDeclaredField(

"mBottomRightStrip");

(2.2之后改为mLeftStrip，mRightStrip)

 

 

得到TabSpec左右两侧按钮的Field对象。然后解除访问限制setAccessible(true);设置未被选中时的背景。

点击事件按钮背景的变化是通过for循环来判断的，个人感觉还有可以改进的地方。

 

public class shiActivity extends Activity implements OnTabChangeListener{TabHost tabHost = null;TabWidget tabWidget = null;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);makeTab();}public TabHost makeTab() {Field mBottomLeftStrip;Field mBottomRightStrip;if (this.tabHost == null) {tabHost = (TabHost) findViewById(android.R.id.tabhost);tabWidget = (TabWidget) findViewById(android.R.id.tabs);tabHost.setup();tabHost.bringToFront(); TabHost.TabSpec tabspec1 = tabHost.newTabSpec(CagConstant.TAB_TAG_CHANGE_INFO); tabspec1.setContent(R.id.baseInfoLay); tabspec1.setIndicator(getString(R.string.app_name),getResources().getDrawable(R.drawable.one)); TabHost.TabSpec tabspec2 = tabHost.newTabSpec(CagConstant.TAB_TAG_ROUTE_INFO); tabspec2.setContent(R.id.routeLay); tabspec2.setIndicator(getString(R.string.app_name),getResources().getDrawable(R.drawable.two)); TabHost.TabSpec tabspec3 = tabHost.newTabSpec(CagConstant.TAB_TAG_STATION_INFO); tabspec3.setContent(R.id.stationLay); tabspec3.setIndicator(getString(R.string.app_name),getResources().getDrawable(R.drawable.three)); tabHost.addTab(tabspec1); tabHost.addTab(tabspec2); tabHost.addTab(tabspec3); tabHost.setOnTabChangedListener(this); if (Integer.valueOf(Build.VERSION.SDK) <= 7) {try {mBottomLeftStrip = tabWidget.getClass().getDeclaredField("mBottomLeftStrip");mBottomRightStrip = tabWidget.getClass().getDeclaredField("mBottomRightStrip");if (!mBottomLeftStrip.isAccessible()) {mBottomLeftStrip.setAccessible(true);}if (!mBottomRightStrip.isAccessible()) {mBottomRightStrip.setAccessible(true);}mBottomLeftStrip.set(tabWidget,getResources().getDrawable(R.drawable.bar));mBottomRightStrip.set(tabWidget, getResources().getDrawable(R.drawable.bar));} catch (Exception e) {e.printStackTrace();}} else {try {mBottomLeftStrip = tabWidget.getClass().getDeclaredField("mLeftStrip");mBottomRightStrip = tabWidget.getClass().getDeclaredField("mRightStrip");if (!mBottomLeftStrip.isAccessible()) {mBottomLeftStrip.setAccessible(true);}if (!mBottomRightStrip.isAccessible()) {mBottomRightStrip.setAccessible(true);}mBottomLeftStrip.set(tabWidget,getResources().getDrawable(R.drawable.linee));mBottomRightStrip.set(tabWidget, getResources().getDrawable(R.drawable.linee));} catch (Exception e) { // TODO Auto-generated catch blocke.printStackTrace();}}for (int i = 0; i < tabWidget.getChildCount(); i++) {final TextView tv = (TextView) tabWidget.getChildAt(i).findViewById(android.R.id.title);tv.setTextColor(Color.WHITE);View vvv = tabWidget.getChildAt(i);if (tabHost.getCurrentTab() == i) {vvv.setBackgroundDrawable(getResources().getDrawable(R.drawable.bar));}else {vvv.setBackgroundDrawable(getResources().getDrawable(R.drawable.bar));}}tabHost.setOnTabChangedListener(new OnTabChangeListener() {@Overridepublic void onTabChanged(String tabId) {Log.v("xxx", tabId);// TODO Auto-generated method stubfor (int i = 0; i < tabWidget.getChildCount(); i++) {View vvv = tabWidget.getChildAt(i);if (tabHost.getCurrentTab() == i) {vvv.setBackgroundDrawable(getResources().getDrawable(R.drawable.bar));} else {vvv.setBackgroundDrawable(getResources().getDrawable(R.drawable.icon));}}}});} else {return tabHost;}return null;}@Overridepublic void onTabChanged(String tabId) {// TODO Auto-generated method stub}}