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技术人员核心竞争力还是技术啊。努力提高各种实现效果。加油哦！
直接看效果。此linearLayout只有两个Button ,当选中Button1,Button1有个下划线选中效果。当选中Buton2，Button2有个下划线选中效果。
如下图。
package com.daoge.ui; import roboguice.activity.RoboActivity; import roboguice.inject.InjectView; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.LinearLayout; import com.daoge.utils.DensityUtils; import com.daoge.utils.ResourceReader; import com.roboguicetest.R; public class MainActivity extends RoboActivity implements OnClickListener { @InjectView(R.id.btnTab001) Button btnTab001; @InjectView(R.id.btnTab002) Button btnTab002; @InjectView(R.id.layout_tab) LinearLayout layout_tab; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.test_layout); initAllViews(); } private void initAllViews() { btnTab001.setOnClickListener(this); btnTab002.setOnClickListener(this); } public void onClick(View v) { switch (v.getId()) { case R.id.btnTab001 : setTabSelected(btnTab001); break; case R.id.btnTab002 : setTabSelected(btnTab002); break; default : break; } } private void setTabSelected(Button btnSelected) { Drawable selectedDrawable = ResourceReader.readDrawable(this, R.drawable.shape_nav_indicator); int screenWidth = DensityUtils.getScreenSize(MainActivity.this)[0]; int right = screenWidth / 2; selectedDrawable.setBounds(0, 0, right, DensityUtils.dipTopx(this, 3)); btnSelected.setSelected(true); btnSelected.setCompoundDrawables(null, null, null, selectedDrawable); int size = layout_tab.getChildCount(); for (int i = 0; i < size; i++) { if (btnSelected.getId() != layout_tab.getChildAt(i).getId()) { layout_tab.getChildAt(i).setSelected(false); ((Button) layout_tab.getChildAt(i)).setCompoundDrawables(null, null, null, null); } } } }
最重要的地方在这里
private void setTabSelected(Button btnSelected) { Drawable selectedDrawable = ResourceReader.readDrawable(this, R.drawable.shape_nav_indicator); int screenWidth = DensityUtils.getScreenSize(MainActivity.this)[0]; int right = screenWidth / 2; selectedDrawable.setBounds(0, 0, right, DensityUtils.dipTopx(this, 3)); btnSelected.setSelected(true); btnSelected.setCompoundDrawables(null, null, null, selectedDrawable); int size = layout_tab.getChildCount(); for (int i = 0; i < size; i++) { if (btnSelected.getId() != layout_tab.getChildAt(i).getId()) { layout_tab.getChildAt(i).setSelected(false); ((Button) layout_tab.getChildAt(i)).setCompoundDrawables(null, null, null, null); } } }
得到这个Drawable，那么这个Drawable从哪里来呢？？
R.drawable.shape_nav_indicator
看这个drawable.shape文件吧
<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" > <solid android:color="@color/global_red" /> <size android:width="1000dp" /> <padding android:bottom="2dp" android:left="5dp" android:right="5dp" android:top="2dp" /> </shape>
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原文地址：http://www.cnblogs.com/lixiaodaoaaa/p/4225556.html
