CSE 660 Lab 3 Khoi Pham Thanh Ho April 19 th, 2015
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1 CSE 660 Lab 3 Khoi Pham Thanh Ho April 19 th, 2015 Comment and Evaluation: This lab introduces us about Android SDK and how to write a program for Android platform. The calculator is pretty easy, everything mostly come from the instructions. The fragment program explanation is already on Youtube, anyway we think it s a good lab to begin with Android SDK. Evaluation: We have done everything in the lab successfully, therefore, I would rate our works 30/30. I. A Simple Calculator 4. Compile and run the program: First we copied pasted all the code from instructions, and here is the Running Program: Minus Add
2 Multiple Divide. 5. Modify the above code so that the buttons of the operators are replaced by images of them. First we add 4 image of +, -, x, / button into workspace/calculator/res/ drawable-hdpi directory. Then we change Button to ImageButton to display button as an image. Code: //MainActivity.java import android.widget.imagebutton; public class MainActivity extends Activity implements View.OnClickListener{ EditText t1; EditText t2; ImageButton plus; ImageButton minus; ImageButton multiply; ImageButton divide; TextView displayresult;
3 String oper = ""; /** Called when the activity is first created. public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); // find the EditText elements (defined in res/layout/activity_main.xml t1 = (EditText) findviewbyid(r.id.t1); t2 = (EditText) findviewbyid(r.id.t2); plus = (ImageButton) findviewbyid(r.id.plus); minus = (ImageButton) findviewbyid(r.id.minus); multiply = (ImageButton) findviewbyid(r.id.multiply); divide = (ImageButton) findviewbyid(r.id.divide); displayresult = (TextView) findviewbyid(r.id.displayresult); // set listeners plus.setonclicklistener( this ); minus.setonclicklistener( this); multiply.setonclicklistener( this); divide.setonclicklistener( this); //activity_main.xml <LinearLayout android:id="@+id/linearlayout2" android:layout_margintop="4pt" android:layout_marginleft="6pt" android:layout_marginright="6pt"> <ImageButton android:id="@+id/minus" android:layout_width="90dp" android:layout_height="90dp" android:layout_alignparentright="true" android:layout_alignparenttop="true" android:layout_marginright="40dp" android:adjustviewbounds="true" android:background="@drawable/minus" android:scaletype="centercrop"
4 />// here we load the minus image from src. <ImageButton android:layout_width="90dp" android:layout_height="90dp" android:layout_alignparentleft="true" android:layout_alignparenttop="true" android:layout_marginleft="37dp" android:adjustviewbounds="true" android:scaletype="centercrop" /> //here we load the add image from src. <LinearLayout android:layout_margintop="4pt" android:layout_marginleft="6pt" android:layout_marginright="6pt"> <ImageButton android:layout_width="90dp" android:layout_height="90dp" android:layout_alignparentright="true" android:layout_alignparenttop="true" android:layout_marginright="40dp" android:adjustviewbounds="true" android:scaletype="centercrop" /> //here we load the devide image from src. <ImageButton android:layout_width="90dp" android:layout_height="90dp" android:layout_alignparentleft="true" android:layout_alignparenttop="true" android:layout_marginleft="37dp" android:adjustviewbounds="true" android:scaletype="centercrop" /> //here we load the multiply image from src.
5 Running Program: Add Devide
6 Minus Multiply II. Android Fragments We added 2 java class: FragmentA and FragmentB, then we added 2 xml linear layout: fragment_a and fragment_b. Code: //MainActivity.java public class MainActivity extends FragmentActivity protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); FragmentManager myfragmentmanager = getsupportfragmentmanager();
7 FragmentTransaction fragmenttransaction = myfragmentmanager.begintransaction(); FragmentA fragmenta = new FragmentA();//Set default as fragment A fragmenttransaction.add(r.id.fragment_placeholder, fragmenta); fragmenttransaction.commit(); //This procedure do the swap between fragment A and B. public void selectfragment(view v) { Fragment newfragment; if (v == findviewbyid(r.id.buttona)) { newfragment = new FragmentA(); //else if (v == findviewbyid(r.id.buttonb)) { else { newfragment = new FragmentB(); FragmentManager myfragmentmanager = getsupportfragmentmanager(); FragmentTransaction fragmenttransaction = myfragmentmanager.begintransaction(); fragmenttransaction.replace(r.id.fragment_placeholder, newfragment); fragmenttransaction.addtobackstack(null); fragmenttransaction.commit(); //FragmentA.java package example.fragment; import android.os.bundle; import android.support.v4.app.fragment; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; public class FragmentA extends Fragment public View oncreateview(layoutinflater inflater, ViewGroup container, Bundle savedinstancestate) { // Inflate the layout for this fragment return inflater.inflate(r.layout.fragment_a, container, false);
8 //FragmentB.java package example.fragment; import android.os.bundle; import android.support.v4.app.fragment; import android.view.layoutinflater; import android.view.view; import android.view.viewgroup; public class FragmentB extends Fragment public View oncreateview(layoutinflater inflater, ViewGroup container, Bundle savedinstancestate) { // Inflate the layout for this fragment return inflater.inflate(r.layout.fragment_b, container, false); //fragment_b.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android=" android:layout_height="match_parent" android:background="#00ffff"//here to set color for fragment B android:orientation="vertical" > <TextView android:id="@+id/textview1" android:layout_width="wrap_content" android:text="i am Fragment B" android:textappearance="?android:attr/textappearancelarge" /> //fragment_a.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android=" android:layout_height="match_parent" android:background="#ff9999"//here to set color for fragment A android:orientation="vertical" >
9 <TextView android:layout_width="wrap_content" android:text="i am Fragment A" android:textappearance="?android:attr/textappearancelarge" > </TextView> //activity_main.xml <LinearLayout xmlns:android=" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <LinearLayout android:orientation="vertical" > <Button // Fragment B swap button android:id="@+id/buttona" android:onclick="selectfragment" android:text="fragment A" /> <Button // Fragment A swap button android:id="@+id/buttonb" android:onclick="selectfragment" android:text="fragment B" /> <LinearLayout // Display the fragment. android:id="@+id/fragment_placeholder" android:layout_height="match_parent" android:orientation="vertical" >
10 Running Program: Fragment A Fragment B
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