Android巧用ActionBar实现下拉式导航

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本文实例为大家分享了ActionBar下拉式导航的实现代码，供大家参考，具体内容如下

利用Actionbar同样可以很轻松的实现下拉式的导航方式，若想实现这种效果：

1）actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST)

2)setListNavigationCallbacks(SpinnerAdapter adapter,ActionBar.OnNavigationListener callback).

首先是创建一个Fragment类：

package ccom.app.main;

import android.annotation.SuppressLint;
import android.app.Fragment;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.widget.TextView;

@SuppressLint("NewApi")
public class MyFragment extends Fragment {

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
   Bundle savedInstanceState) {

  Context context = this.getActivity();

  TextView tv = new TextView(context);

  Bundle arc = this.getArguments();

  int tabs=arc.getInt("key");
  
  tv.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,
    LayoutParams.WRAP_CONTENT));

  tv.setText("hello actionbar "+tabs);

  return tv;

 }

}

main.xml:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:tools="http://schemas.android.com/tools"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".Main" >

 <LinearLayout
  android:id="@+id/content"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical" />

</RelativeLayout>

自定义的用于显示textview的mytextview.xml:

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/text1"
 android:textColor="#fff"
 android:background="#696969"
 android:layout_width="60sp"
 android:layout_height="match_parent"
 android:textAppearance="?android:attr/textAppearanceListItemSmall"
 android:gravity="center_vertical"
 android:paddingStart="?android:attr/listPreferredItemPaddingStart"
 android:minHeight="?android:attr/listPreferredItemHeightSmall"
/>

Main.java

package ccom.app.main;

import android.annotation.SuppressLint;
import android.app.ActionBar;
import android.app.Activity;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.widget.ArrayAdapter;

@SuppressLint("NewApi")
public class Main extends Activity implements ActionBar.OnNavigationListener {

 ActionBar actionBar = null;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);

  actionBar = this.getActionBar();

  actionBar.setDisplayShowTitleEnabled(true);

  actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);

  actionBar.setListNavigationCallbacks(new ArrayAdapter(Main.this,
    R.layout.mytextview, R.id.text1, new String[] { "tab1", "tab2",
      "tab3" }), this);

 }

 @Override
 public boolean onNavigationItemSelected(int itemPosition, long itemId) {

  MyFragment mf = new MyFragment();
  Bundle bundle = new Bundle();
  bundle.putInt("key", itemPosition + 1);
  mf.setArguments(bundle);

  FragmentTransaction action = this.getFragmentManager()
    .beginTransaction();
  action.replace(R.id.content, mf);
  action.commit();
  return true;
 }

}

实现的效果如图：