如果你是android初学者,以前做过javaEE开发,或者说你有java基础。那么你学完了android 四大组件。就可以来看看这篇文章了。
四大组件我就不说了 网上一大把的文章 ,四大组件包括 activity service Content Providers Intent
如果这篇文章你理解了,加上会xml解析 Json解析(json解析比xml更快,推荐大家以后使用json)就可以去面试android开发了
按钮放在底部是使用TabHost实现的。TabHost可以放在顶部 也可以放在底部。我之前已经发过三篇关于TabHost的文章
如果有不懂的 可以留言给我 ,也可以去看看我之前的三篇文章。 和这里相反的一篇文章是http://blog.youkuaiyun.com/sun6223508/article/details/6617545
转帖请注明出处 http://blog.youkuaiyun.com/sun6223508
MainActivity.java
- public class MainActivity extends TabActivity {
- private RadioGroup group;
- private TabHost tabHost;
- public static final String TAB_HOME = "tabHome";
- public static final String TAB_MES = "tabMes";
- public static final String TAB_TOUCH = "tab_touch";
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.maintabs);
- group = (RadioGroup) findViewById(R.id.main_radio);
- tabHost = getTabHost();
- tabHost.addTab(tabHost.newTabSpec(TAB_HOME).setIndicator(TAB_HOME)
- .setContent(new Intent(this, Main.class)));
- tabHost.addTab(tabHost.newTabSpec(TAB_MES).setIndicator(TAB_MES)
- .setContent(new Intent(this, Main2.class)));
- tabHost.addTab(tabHost.newTabSpec(TAB_TOUCH).setIndicator(TAB_TOUCH)
- .setContent(new Intent(this, Main.class)));
- group.setOnCheckedChangeListener(new OnCheckedChangeListener() {
- public void onCheckedChanged(RadioGroup group, int checkedId) {
- switch (checkedId) {
- case R.id.radio_button0:
- tabHost.setCurrentTabByTag(TAB_HOME);
- break;
- case R.id.radio_button1:
- tabHost.setCurrentTabByTag(TAB_MES);
- break;
- case R.id.radio_button2:
- tabHost.setCurrentTabByTag(TAB_TOUCH);
- break;
- default:
- break;
- }
- }
- });
- }
- }
maintabs.xml
- <?xml version="1.0" encoding="UTF-8"?>
- <TabHost android:id="@android:id/tabhost" android:layout_width="fill_parent"
- android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android">
- <LinearLayout android:orientation="vertical"
- android:layout_width="fill_parent" android:layout_height="fill_parent">
- <FrameLayout android:id="@android:id/tabcontent"
- android:layout_width="fill_parent" android:layout_height="0.0dip"
- android:layout_weight="1.0" />
- <TabWidget android:id="@android:id/tabs" android:visibility="gone"
- android:layout_width="fill_parent" android:layout_height="wrap_content"
- android:layout_weight="0.0" />
- <RadioGroup android:gravity="center_vertical"
- android:layout_gravity="bottom" android:orientation="horizontal"
- android:id="@+id/main_radio" android:background="@drawable/home_btn_bg"
- android:layout_width="fill_parent" android:layout_height="wrap_content">
- <RadioButton android:id="@+id/radio_button0" android:tag="radio_button0"
- android:layout_marginTop="2.0dip" android:text="@string/main_home" android:background="@drawable/home_btn_bg"
- android:drawableTop="@drawable/icon_1_n" style="@style/main_tab_bottom" />
- <RadioButton android:id="@+id/radio_button1" android:tag="radio_button1"
- android:layout_marginTop="2.0dip" android:text="@string/main_message" android:background="@drawable/home_btn_bg"
- android:drawableTop="@drawable/icon_2_n" style="@style/main_tab_bottom" />
- <RadioButton android:id="@+id/radio_button2" android:tag="radio_button2"
- android:layout_marginTop="2.0dip" android:text="@string/main_comment" android:background="@drawable/home_btn_bg"
- android:drawableTop="@drawable/icon_3_n" style="@style/main_tab_bottom" />
- </RadioGroup>
- </LinearLayout>
- </TabHost>
最关键就是上面这个XML了。它调用系统的tabhost
main.java
- public class Main extends Activity {
- /** Called when the activity is first created. */
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- }
- }
main.xml
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical" android:layout_width="fill_parent"
- android:layout_height="fill_parent">
- <ImageView android:text="@+id/Button01" android:id="@+id/Button01"
- android:layout_width="wrap_content" android:layout_height="wrap_content"
- android:background="@drawable/sfsd"></ImageView>
- </LinearLayout>
- public class Main2 extends Activity{
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- // TODO Auto-generated method stub
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main2);
- }
- }
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:orientation="vertical"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- >
- <ImageView android:text="@+id/Button01" android:id="@+id/Button01"
- android:layout_width="wrap_content" android:layout_height="wrap_content"
- android:background="@drawable/dsfdsfds"></ImageView>
- </LinearLayout>
最关键的就是MainActivity.java这个文件 和它的layout