Passing value to another Activity2

The CounterDemo class will pass a key/pair (name/"Your name here") to another class Activity2 via an Intent.
The Activity2 is refer as the TARGET activity.
The Activity2 may not be in the same project. Android will smart enough to look for it in your phone.

package com.ugrowit; import android.app.Activity; import android.content.Intent; import android.net.Uri; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; public class Activity2 extends Activity implements OnClickListener{               private EditText txtUsername;               @Override        public void onCreate(Bundle savedInstanceState) {               super.onCreate(savedInstanceState);               setContentView(R.layout.activity2);               Button btnSubmit = (Button)findViewById(R.id.btnSubmit);               btnSubmit.setOnClickListener(this);                             String defaultName = "";                             Bundle extras = getIntent().getExtras();                             if ( extras != null ) {                      defaultName = extras.getString("Name");               }               txtUsername = (EditText) findViewById(R.id.txtUsername);               txtUsername.setHint(defaultName);                      }        @Override        public void onClick(View arg0) {                             Intent data = new Intent();               // Pass the data(user name) back to the calling Activity               data.setData(                            Uri.parse(txtUsername.getText().toString()));                             setResult(RESULT_OK, data);                             finish();                      }      }

package com.test; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.RadioButton; public class CounterDemo extends Activity implements OnClickListener{            private Button btnCount;     private Button btnGo;     private EditText txtCount;     private RadioButton radioUp;     private RadioButton radioDown;     private int count = 0; // Initial count         @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);                 radioUp = (RadioButton)findViewById(R.id.radioUp);         radioDown = (RadioButton)findViewById(R.id.radioDown);                 txtCount = (EditText)findViewById(R.id.txtCount);         txtCount.setText(String.valueOf(count));                 // Retrieve a reference to the Button view by finding it by its id         btnCount = (Button)findViewById(R.id.btnCount);         btnCount.setOnClickListener(this);                 btnGo = (Button)findViewById(R.id.btnGo);         btnGo.setOnClickListener(new OnClickListener(){               @Override               public void onClick(View arg0) {                      Intent i = new Intent("com.ugrowit.ACTIVITY2");                                           Bundle extras = new Bundle();                      extras.putString("Name", "Your name here");                      i.putExtras(extras);                      startActivityForResult(i,1);               }         }         );     }        @Override        public void onClick(View arg0) {               if(radioUp.isChecked()){                      count++;               }               if(radioDown.isChecked()) {                      count--;               }               txtCount.setText(String.valueOf(count));                                    } }

a basic Activity class in Android

create:
a TextBox (EditText)
two radio button grouped within a RadioGroup
a button.

e.g. main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:orientation="vertical"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     > <EditText     android:id="@+id/txtCount"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:editable="false"/>     <RadioGroup android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal">         <RadioButton     android:id="@+id/radioUp"     android:text="@string/radioUpLabel"     android:layout_width="wrap_content"     android:layout_height="wrap_content"     android:checked="true"/>     <RadioButton     android:id="@+id/radioDown"     android:text="@string/radioDownLabel"     android:layout_width="wrap_content"     android:layout_height="wrap_content"/> </RadioGroup> <Button android:id="@+id/btnCount" android:text="@string/btnCountLabel" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </LinearLayout>

The main Activity class:- CounterDemo

package com.test; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.RadioButton; public class CounterDemo extends Activity implements OnClickListener{            private Button btnCount;     private EditText txtCount;     private RadioButton radioUp;     private RadioButton radioDown;     private int count = 0; // Initial count         @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.main);                 radioUp = (RadioButton)findViewById(R.id.radioUp);         radioDown = (RadioButton)findViewById(R.id.radioDown);                 txtCount = (EditText)findViewById(R.id.txtCount);         txtCount.setText(String.valueOf(count));                 // Get the reference to the Button view         btnCount = (Button)findViewById(R.id.btnCount);         btnCount.setOnClickListener(this);               }        @Override        public void onClick(View arg0) {               if(radioUp.isChecked()){                      count++;               } else {                      count--;               }               txtCount.setText(String.valueOf(count));                      } }

Draw a line in Android

package com.ugrowit; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.view.View; public class DrawView extends View {       Paint paint = new Paint();       public DrawView(Context context) {                         super(context);             paint.setColor(Color.BLUE);                   }       @Override       public void onDraw(Canvas canvas) {                         canvas.drawLine(0, 0, getWidth(), getHeight(), paint);                               } }

package com.ugrowit; import android.app.Activity; import android.graphics.Color; import android.os.Bundle; public class DrawLineDemo extends Activity {       DrawView drawView;           @Override     public void onCreate(Bundle savedInstanceState) {               super.onCreate(savedInstanceState);                 drawView = new DrawView(this);         drawView.setBackgroundColor(Color.WHITE);         setContentView(drawView);             } }