Map Lab - Copy.docx

EXPERIMENT NO: 13 AIM: Install Android SDK (programming environment) and write a program to display "hello world". INTRODUCTION TO ANDROID SDK To develop apps for Android devices, we use a set of tools that are included in the Android SDK. Once the Android SDK is downloaded and installed, we can access these tools right from the Eclipse IDE, through the ADT plugin or from the command line. Developing with Eclipse is the preferred method because it can directly invoke the tools that we need while developing applications. INSTALLATION PROCEDURE OF ANDROID SDK STEP 1: INSTALL THE JDK Android requires the JDK "Java Development Kit" to compile java programs. Install the version of the JDK appropriate for OS. STEP 2: INSTALL IDE Download a current stable build of Eclipse from the Eclipse Web Site. For the recommended package to download and install, click the link Eclipse IDE for java EE Developers on the Eclipse Packages page. There is no installer used to install Eclipse. The process described below involves un-archiving a directory tree of files and placing it in an appropriate location on the hard disk.    

Unzip the software into an appropriate location on hard disk. Once the unzipped files are located on the filesystem, get started using Eclipse. Run Eclipse by running C:\eclipse\eclipse.exe. The first time we run Eclipse, we will be prompted to identify a location for our Eclipse workspace. This is where local copies of our projects will live on our file system.

STEP 3: INSTALL THE ANDROID SDK Download the latest module and pop it into the SDK. We can pick and choose which modules to install. SOURCE CODE FOR HELLO WORLD MAINACTIVITY.JAVA

package com.hello_world; import android.os.Bundle; import android.app.Activity; import android.view.Menu; public class MainActivity extends Activity { protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.main, menu); return true; } } OUTPUT This is how output appears on the android mobile device on successful compilation of the source code.

CONCLUSION We have successfully displayed hello world on android mobile device.

EXPERIMENT NO: 14 AIM: Write a program to implement a distance converter using buttons. HARDWARE/SOFTWARE REQUIREMENTS: Android SDK , JDK , Android Handset, Connecting Cable. PROCEDURE: 1. Open Android SDK . 2. Start File -> New -> Android Application Project. 3. Write Application name, Project name, Package name 4. Continue clicking next by filling necessary details. 5. Click Finish. 6. Write source code. SOURCE CODE: MAINACTIVITY.JAVA package com.example.experiment2; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.LinearLayout; import android.widget.RadioButton; import android.widget.TextView; import android.app.Activity; import android.graphics.Color; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public void add(View v) { LinearLayout ll=(LinearLayout)findViewById(R.id.ll); TextView result=(TextView)findViewById(R.id.result); EditText et1=(EditText)findViewById(R.id.editText1); //get value from edit text box and convert into double double a=Double.parseDouble(String.valueOf(et1.getText())); RadioButton cb=(RadioButton)findViewById(R.id.km); RadioButton fb=(RadioButton)findViewById(R.id.ml); //check which radio button is checked if(cb.isChecked()) {

//change background colour ll.setBackgroundColor(Color.YELLOW); //display conversion result.setText(m2k(a)+" miles"); //cb.setChecked(false); fb.setChecked(true); } else { ll.setBackgroundColor(Color.CYAN); result.setText(k2m(a)+" km"); //fb.setChecked(false); cb.setChecked(true); } } private double k2m(double c) { return (c*1.609344); } private double m2k(double f) { return (f*0.621372); } }

ACTIVITY CODE

<EditText android:id="@+id/editText1" android:layout_width="match_parent" android:layout_height="wrap_content" android:inputType="numberDecimal" >
android:layout_height="wrap_content" android:textSize="30sp" /> <Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="add" android:text="Convert" android:textSize="30sp" tools:ignore="OnClick" />

OUTPUT This is how output appears on the android mobile device on successful compilation of the source code.

CONCLUSION We have successfully implemented distance converter on android mobile device.

EXPERIMENT NO: 15 AIM: Write a program to implement a calculator. Display result in different activity. HARDWARE/SOFTWARE REQUIREMENTS: Android SDK , JDK , Android Handset, Connecting Cable. PROCEDURE: 1. Open Android SDK . 2. Start File -> New -> Android Application Project. 3. Write Application name, Project name, Package name 4. Continue clicking next by filling necessary details. 5. Click Finish. 6. Write source code. SOURCE CODE: MAIN ACTIVITY.JAVA package com.calculator; import android.os.Bundle; import android.app.Activity; import android.text.Editable; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class MainActivity extends Activity implements OnClickListener { Button one, two, three, four, five, six, seven, eight, nine, div, sub, mul, add, zero, cancel, equal; EditText display; int op1, op2; String optr; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.android_main); one= (Button)findViewById(R.id.one); two= (Button)findViewById(R.id.two); three= (Button)findViewById(R.id.three); four= (Button)findViewById(R.id.four); five= (Button)findViewById(R.id.five); six= (Button)findViewById(R.id.six); seven= (Button)findViewById(R.id.seven); eight= (Button)findViewById(R.id.eight); nine= (Button)findViewById(R.id.nine); zero= (Button)findViewById(R.id.zero); add= (Button)findViewById(R.id.add);

sub= (Button)findViewById(R.id.sub); mul= (Button)findViewById(R.id.mul); div= (Button)findViewById(R.id.div); equal= (Button)findViewById(R.id.equal); cancel=(Button)findViewById(R.id.cancel); display= (EditText)findViewById(R.id.display); try{ one.setOnClickListener(this); two.setOnClickListener(this); three.setOnClickListener(this); four.setOnClickListener(this); five.setOnClickListener(this); six.setOnClickListener(this); seven.setOnClickListener(this); eight.setOnClickListener(this); nine.setOnClickListener(this); zero.setOnClickListener(this); add.setOnClickListener(this); sub.setOnClickListener(this); mul.setOnClickListener(this); div.setOnClickListener(this); equal.setOnClickListener(this); cancel.setOnClickListener(this); } catch (Exception e){} } public void operation(){ if (optr.equals("+")){ op2=Integer.parseInt(display.getText().toString()); display.setText(""); op1=op1+op2; display.setText("Result:"+Integer.toString(op1)); } else if (optr.equals("-")){ op2=Integer.parseInt(display.getText().toString()); display.setText(""); op1=op1-op2; display.setText("Result:"+Integer.toString(op1)); } else if (optr.equals("*")){ op2=Integer.parseInt(display.getText().toString()); display.setText(""); op1=op1*op2; display.setText("Result:"+Integer.toString(op1)); } else if (optr.equals("/")){ op2=Integer.parseInt(display.getText().toString());

display.setText(""); op1=op1/op2; display.setText("Result:"+Integer.toString(op1)); } } public void onClick(android.view.View arg0) { Editable str=display.getText(); switch(arg0.getId()){ case R.id.one:if (op2!=0){ op2=0; display.setText(""); } str=str.append(one.getText()); display.setText(str); break; case R.id.two:if (op2!=0){ op2=0; display.setText(""); } str=str.append(two.getText()); display.setText(str); break; case R.id.three:if (op2!=0){ op2=0; display.setText(""); } str=str.append(three.getText()); display.setText(str); break; case R.id.four:if (op2!=0){ op2=0; display.setText(""); } str=str.append(four.getText()); display.setText(str); break; case R.id.five:if (op2!=0){ op2=0; display.setText(""); } str=str.append(five.getText()); display.setText(str); break; case R.id.six:if (op2!=0){

op2=0; display.setText(""); } str=str.append(six.getText()); display.setText(str); break; case R.id.seven:if (op2!=0){ op2=0; display.setText(""); } str=str.append(seven.getText()); display.setText(str); break; case R.id.eight:if (op2!=0){ op2=0; display.setText(""); } str=str.append(eight.getText()); display.setText(str); break; case R.id.nine:if (op2!=0){ op2=0; display.setText(""); } str=str.append(nine.getText()); display.setText(str); break; case R.id.cancel: op1=0; op2=0; display.setText(""); display.setHint("Perform Operation"); break; case R.id.add: optr="+"; if (op1==0){ op1=Integer.parseInt(display.getText().toString()); display.setText(""); }else if (op2!=0){ op2=0; display.setText(""); } else{ op2=Integer.parseInt(display.getText().toString()); display.setText("");

op1=op1+op2; display.setText("Result:" + Integer.toString(op1)); } break; case R.id.sub: optr="-"; if (op1==0){ op1=Integer.parseInt(display.getText().toString()); display.setText(""); } else if (op2!=0){ op2=0; display.setText(""); } else{ op2=Integer.parseInt(display.getText().toString()); display.setText(""); op1=op1-op2; display.setText("Result:"+Integer.toString(op1)); } break; case R.id.mul: optr="*"; if (op1==0){ op1=Integer.parseInt(display.getText().toString()); display.setText(""); } else if (op2!=0){ op2=0; display.setText(""); } else{ op2=Integer.parseInt(display.getText().toString()); display.setText(""); op1=op1*op2; display.setText("Result:"+Integer.toString(op1)); } break; case R.id.div: optr="/"; if (op1==0){ op1=Integer.parseInt(display.getText().toString()); display.setText(""); } else if (op2!=0){ op2=0; display.setText("");

} else{ op2=Integer.parseInt(display.getText().toString()); display.setText(""); op1=op1/op2; display.setText("Result:"+Integer.toString(op1)); } break; case R.id.equal: if(!optr.equals(null)){ if(op2!=0){ if(optr.equals("+")){ display.setText(""); display.setText("Result:"+Integer.toString(op1)); } else if(optr.equals("-")){ display.setText(""); display.setText("Result:"+Integer.toString(op1)); } else if(optr.equals("*")){ display.setText(""); display.setText("Result:"+Integer.toString(op1)); } else if(optr.equals("/")){ display.setText(""); display.setText("Result:"+Integer.toString(op1)); } } else{ operation(); } } break; } } } HOME.JAVA package com.calculator; import android.app.Activity; import android.content.Intent; import android.os.Bundle; public class Home extends Activity { protected void onCreate(Bundle savedInstanceState){

super.onCreate(savedInstanceState); setContentView(R.layout.home); Thread th=new Thread(){ public void run(){ try{ sleep(2000); } catch (Exception e){ e.printStackTrace(); } finally{ onPause(); startActivity Intent("com.calculator.android_main")); } } }; th.start(); } public void onPause(){ super.onPause(); finish(); } }

(new

OUTPUT This is how output appears on the android mobile device on successful compilation of the source code.

CONCLUSION We have successfully implemented calculator on android mobile device

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