Android编程之ActionBar Tabs用法实例分析

importandroid.app.ActionBar;

importandroid.app.Activity;

importandroid.app.FragmentTransaction;

importandroid.app.ActionBar.Tab;

importandroid.os.Bundle;

importandroid.os.CountDownTimer;

importandroid.view.MotionEvent;

importandroid.view.Window;

publicclassActionBarActivityextendsActivity {

  /** Called when the activity is first created. */

  @Override

  publicvoidonCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    //使ActionBar变得透明

    requestWindowFeature(Window.FEATURE_ACTION_BAR_OVERLAY);

    setContentView(R.layout.main);

    finalActionBar actionBar = getActionBar();

    actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    // remove the activity title to make space for tabs

    actionBar.setDisplayShowTitleEnabled(false);

    AFragment aFragment =newAFragment();

    actionBar.addTab(actionBar.newTab().setText("Tab-A")

        .setTabListener(newListenerA(aFragment)));

    BFragment bFragment =newBFragment();

    actionBar.addTab(actionBar.newTab().setText("Tab-B")

        .setTabListener(newListenerB(bFragment)));

  }

  //点击显示or隐藏ActionBar

  publicbooleanonTouchEvent(MotionEvent event){

    ActionBar bar = getActionBar();

    switch(event.getAction()){

      caseMotionEvent.ACTION_UP:

        if(bar.isShowing()) bar.hide();

        elsebar.show();

        break;

      default:

          break;

    }

    returntrue;

  }

  privateclassListenerAimplementsActionBar.TabListener {

    privateAFragment mFragment;

    // Called to create an instance of the listener when adding a new tab

    publicListenerA(AFragment fragment) {

      mFragment = fragment;

    }

    publicvoidonTabSelected(Tab tab, FragmentTransaction ft) {

      ft.add(R.id.fragment, mFragment,null);

    }

    publicvoidonTabUnselected(Tab tab, FragmentTransaction ft) {

      ft.remove(mFragment);

    }

    publicvoidonTabReselected(Tab tab, FragmentTransaction ft) {

      // do nothing }

    }

  }

  privateclassListenerBimplementsActionBar.TabListener {

    privateBFragment mFragment;

    // Called to create an instance of the listener when adding a new tab

    publicListenerB(BFragment fragment) {

      mFragment = fragment;

    }

    publicvoidonTabSelected(Tab tab, FragmentTransaction ft) {

      ft.add(R.id.fragment, mFragment,null);

    }

    publicvoidonTabUnselected(Tab tab, FragmentTransaction ft) {

      ft.remove(mFragment);

    }

    publicvoidonTabReselected(Tab tab, FragmentTransaction ft) {

      // do nothing }

    }

  }

}

publicclassAFragmentextendsFragment {

  publicView onCreateView(LayoutInflater inflater, ViewGroup container,

      Bundle savedInstanceState) {

    returninflater.inflate(R.layout.alayout, container,false);

    }

}

newAlertDialog.Builder(EX03_12.this)

.setTitle(R.string.app_about)

.setMessage(R.string.app_about_msg)

.setPositiveButton(R.string.str_ok,

  newDialogInterface.OnClickListener()

  {

  publicvoidonClick(DialogInterface dialoginterface,inti)

  {

  }

  }).show();

/*使用系统标准的 makeText()方式来产生Toast讯息*/

Toast.makeText( EX04_03.this,String,Toast.LENGTH_LONG).show();

 <itemandroid:id="@+id/about"

   android:title="关于"/>

 <itemandroid:id="@+id/exit"

   android:title="退出"/>

packagecom.yarin.android.Examples_04_13;

importandroid.app.Activity;

importandroid.content.Intent;

importandroid.os.Bundle;

importandroid.view.Menu;

importandroid.view.MenuInflater;

importandroid.view.MenuItem;

publicclassActivity01extendsActivity

{

 /** Called when the activity is first created. */

 @Override

 publicvoidonCreate(Bundle savedInstanceState)

 {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

 }

 /*创建menu*/

 public boolean onCreateOptionsMenu(Menu menu)

 {

  //MenuInflater class is used to instantiate menu XML files into Menu objects

  MenuInflater inflater = getMenuInflater();

  //设置menu界面为res/menu/menu.xml

  inflater.inflate(R.menu.menu, menu);

  return true;

 }

 /*处理菜单事件*/

 public boolean onOptionsItemSelected(MenuItem item)

 {

  //得到当前选中的MenuItem的ID,

  int item_id = item.getItemId();

  switch (item_id)

  {

   case R.id.about:

    /* 新建一个Intent对象 */

    Intent intent = new Intent();

    /* 指定intent要启动的类 */

    intent.setClass(Activity01.this, Activity02.class);

    /* 启动一个新的Activity */

    startActivity(intent);

    /* 关闭当前的Activity */

    Activity01.this.finish();

    break;

   caseR.id.exit:

    Activity01.this.finish();

    break;

  }

  returntrue;

 }

}

packagecom.yarin.android.Examples_04_13;

importandroid.app.Activity;

importandroid.content.Intent;

importandroid.os.Bundle;

importandroid.view.Menu;

importandroid.view.MenuItem;

publicclassActivity02extendsActivity

{

 publicvoidonCreate(Bundle savedInstanceState)

 {

  super.onCreate(savedInstanceState);

  /* 设置显示main2.xml布局 */

  setContentView(R.layout.main2);

 }

 /*创建menu*/

 public boolean onCreateOptionsMenu(Menu menu)

 {

  //为menu添加内容

  menu.add(0, 0, 0, R.string.ok);

  menu.add(0, 1, 1, R.string.back);

  return true;

 }

 /*处理menu的事件*/

 public boolean onOptionsItemSelected(MenuItem item)

 {

  //得到当前选中的MenuItem的ID,

  int item_id = item.getItemId();

  switch (item_id)

  {

   case 0:

   case 1:

    /* 新建一个Intent对象 */

    Intent intent = new Intent();

    /* 指定intent要启动的类 */

    intent.setClass(Activity02.this, Activity01.class);

    /* 启动一个新的Activity */

    startActivity(intent);

    /* 关闭当前的Activity */

    Activity02.this.finish();

    break;

  }

  returntrue;

 }

}