创建 居于屏幕下方的tabhost，动态更换tab的背景图片和字体颜色
话说这个东西耗费了我一上午的时间。经过查阅资料和自己的一些想法。终于搞定了。下面是代码。希望能和大家一起学习。我是没学几天的新手。希望大神勿喷啊。
MainActivity.java
package com.example.pwdmanaget; import android.app.Activity; import android.content.Intent; import android.content.SharedPreferences; import android.content.res.Resources; import android.graphics.Color; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.util.Log; import android.view.Gravity; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.SimpleAdapter; import android.widget.TabHost; import android.widget.TextView; import android.widget.Toast; import android.widget.TabHost.TabSpec; public class MainActivity extends Activity { private String ACTIVITY_NAME = "B"; private LinearLayout ll; private Button btn_exit; private SharedPreferences sp; private int bg_info; private int bc_count; private int[] unSelectedTabIcons = {R.drawable.menu_icon_0_normal,R.drawable.menu_icon_1_normal,R.drawable.menu_icon_2_normal,R.drawable.menu_icon_3_normal}; private int[] selectedTabIcons = {R.drawable.menu_icon_0_pressed,R.drawable.menu_icon_1_pressed,R.drawable.menu_icon_2_pressed,R.drawable.menu_icon_3_pressed}; private String[] menuText = {"menu1","menu2","menu3"}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ll = (LinearLayout)findViewById(R.id.main_ll); btn_exit = (Button)findViewById(R.id.btn_exit); btn_exit.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { finish(); //SysApplication.exit(); } }); sp = getSharedPreferences("PwdManaget", 0); bg_info = sp.getInt("bg_info", R.drawable.bg); Resources resources = getResources(); Drawable drawable = resources.getDrawable(bg_info); ll.setBackgroundDrawable(drawable); // 如果没有继承TabActivity时，通过该种方法加载启动tabHost final TabHost tabHost = (TabHost) findViewById(R.id.tabhost); tabHost.setup(); TabSpec tabSpec = tabHost.newTabSpec("tab1").setIndicator(getTabHost(0)).setContent(R.id.tab1); TabSpec tabSpec2 = tabHost.newTabSpec("tab2").setIndicator(getTabHost(1)).setContent(R.id.tab2); TabSpec tabSpec3 = tabHost.newTabSpec("tab2").setIndicator(getTabHost(2)).setContent(R.id.tab3); tabHost.addTab(tabSpec); tabHost.addTab(tabSpec2); tabHost.addTab(tabSpec3); View view = tabHost.getTabWidget().getChildAt(0); ImageView imageView = (ImageView)view.findViewById(0); imageView.setImageDrawable(getResources().getDrawable(selectedTabIcons[0])); view.setBackgroundDrawable(getResources().getDrawable(R.drawable.home_btn_bg)); tabHost.setOnTabChangedListener(new TabHost.OnTabChangeListener() { @Override public void onTabChanged(String tabId) { updateTab(tabHost); } }); } private View getTabHost(int i) { LinearLayout view = new LinearLayout(this); view.setOrientation(LinearLayout.VERTICAL); view.setBackgroundDrawable(getResources().getDrawable(R.drawable.bottom1)); ImageView iv = new ImageView(this); iv.setId(i); iv.setImageDrawable(getResources().getDrawable(unSelectedTabIcons[i])); TextView tv = new TextView(this); tv.setText(menuText[i]); tv.setGravity(Gravity.CENTER_HORIZONTAL); tv.setTextColor(Color.parseColor("#FFFFFF")); tv.setId(0x0010+i); view.addView(iv); view.addView(tv); return view; } private void updateTab(TabHost tabHost) { int curr = tabHost.getCurrentTab(); View view = tabHost.getTabWidget().getChildAt(curr); view.setBackgroundDrawable(getResources().getDrawable(R.drawable.home_btn_bg)); ImageView imageView = (ImageView)view.findViewById(curr); imageView.setImageDrawable(getResources().getDrawable(selectedTabIcons[curr])); TextView textView = (TextView)view.findViewById(0x0010+curr); textView.setTextColor(Color.parseColor("#FFFFFF")); for (int i = 0; i < tabHost.getTabWidget().getChildCount(); i++) { if(i!=curr){ View curr_view = tabHost.getTabWidget().getChildAt(i); curr_view.setBackgroundDrawable(getResources().getDrawable(R.drawable.bottom1)); ImageView curr_imageView = (ImageView)curr_view.findViewById(i); curr_imageView.setImageDrawable(getResources().getDrawable(unSelectedTabIcons[i])); TextView curr_textView = (TextView)curr_view.findViewById(0x0010+i); curr_textView.setTextColor(Color.parseColor("#E0E0E0")); } } } @Override protected void onStart() { super.onStart(); Log.i(ACTIVITY_NAME, "onstart!"); } @Override protected void onRestart() { super.onRestart(); Log.i(ACTIVITY_NAME, "onRestart!"); } @Override protected void onResume() { super.onResume(); Log.i(ACTIVITY_NAME, "onResume!"); } @Override protected void onPause() { super.onPause(); Log.i(ACTIVITY_NAME, "onPause!"); } @Override protected void onStop() { super.onStop(); Log.i(ACTIVITY_NAME, "onStop!"); } @Override protected void onDestroy() { super.onDestroy(); Log.i(ACTIVITY_NAME, "onDestroy!"); } @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if(keyCode == KeyEvent.KEYCODE_BACK){ Log.i("count", bc_count+""); if(bc_count==0){ Toast.makeText(MainActivity.this, "在按一次退出", Toast.LENGTH_SHORT).show(); new Thread(){ public void run() { try { Thread.sleep(2000); } catch (InterruptedException e) { e.printStackTrace(); }finally{ bc_count = 0; Log.i("count", bc_count+""); } }; }.start(); bc_count++; }else{ finish(); } } return false; } }
activity_main.xml布局文件
<LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:id="@+id/main_ll" xmlns:android="http://schemas.android.com/apk/res/android"> <RelativeLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:background="@drawable/bottom1" > <Button android:id="@+id/btn_exit" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:background="@android:color/transparent" android:onClick="exit()" android:text="退出" android:textColor="#ffffff" android:drawableLeft="@drawable/bt_back" /> <TextView android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerVertical="true" android:layout_centerHorizontal="true" android:text="密码管家" android:textSize="20sp" android:textColor="#ffffff" /> </RelativeLayout> <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1" android:orientation="vertical" > <TabHost android:id="@+id/tabhost" android:layout_width="fill_parent" android:layout_height="wrap_content" > <RelativeLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TabWidget android:id="@android:id/tabs" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true" /> <FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="fill_parent" > <LinearLayout android:id="@+id/tab1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="this is tab1 content" /> </LinearLayout> <LinearLayout android:id="@+id/tab2" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="this is tab2 content" /> </LinearLayout> <LinearLayout android:id="@+id/tab3" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="this is tab3 content" /> </LinearLayout> </FrameLayout> </RelativeLayout> </TabHost> </LinearLayout> </LinearLayout>
下面是完整代码的下载地址
http://pan.baidu.com/s/1dDowK1b
