PowenKo > Android > Tablet > Fragment

January 18, 2012   ·   0 Comments

device-2012-01-18-124333

reference: http://developer.android.com/guide/topics/fundamentals/fragments.html

sample code: Tutorial_Tablet_FragmentActivity


Tutorial_Tablet_FragmentActivity.java

package com.powenko;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class Tutorial_Tablet_FragmentActivity extends Activity implements OnItemClickListener {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ListView l = (ListView) findViewById(R.id.number_list);
        ArrayAdapter numbers = new ArrayAdapter<String>(getApplicationContext(),
                        android.R.layout.simple_list_item_1,
                        new String [] {
                "one", "two", "three", "four", "five", "six"
        });
        l.setAdapter(numbers);
        l.setOnItemClickListener(this);
    }

    /**
     * Add a Fragment to our stack with n Androids in it
     */
    private void stackAFragment(int nAndroids) {
        Fragment f = new TestFragment(nAndroids);

        FragmentTransaction ft = getFragmentManager().beginTransaction();
        ft.replace(R.id.the_frag, f);
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
        ft.addToBackStack(null);
        ft.commit();
    }

        /**
         * Called when a number gets clicked
         */
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                stackAFragment(position + 1);
        }
}

TestFragment.java

package com.powenko;

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.widget.ImageView;
import android.widget.LinearLayout;

public class TestFragment extends Fragment {
    private int nAndroids;

    public TestFragment() {

    }

   /**
    * Constructor for being created explicitly
    */
   public TestFragment(int nAndroids) {
                this.nAndroids = nAndroids;
    }

    /**
     * If we are being created with saved state, restore our state
     */
    @Override
    public void onCreate(Bundle saved) {
        super.onCreate(saved);
        if (null != saved) {
                nAndroids = saved.getInt("nAndroids");
        }
    }

    /**
     * Save the number of Androids to be displayed
     */
    @Override
    public void onSaveInstanceState(Bundle toSave) {
        toSave.putInt("nAndroids", nAndroids);
    }

    /**
     * Make a grid and fill it with n Androids
     */
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle saved) {
        int n;
        Context c = getActivity().getApplicationContext();
        LinearLayout l = new LinearLayout(c);
        for (n = 0; n < nAndroids; n++) {
                ImageView i = new ImageView(c);
                i.setImageResource(R.drawable.icon);
                l.addView(i);
        }
        return l;
    }
}

layout\main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/frags">

    <ListView
            android:id="@+id/number_list"
            android:layout_width="250dip"
            android:layout_height="match_parent" />

    <fragment class="com.powenko.TestFragment"
            android:id="@+id/the_frag"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />

</LinearLayout>
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