The following article provides some Basic Programs for Android.
- Hello World Program. The following program creates an activity that displays “Hello World” on the screen.
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView textView = findViewById(R.id.text_view);
textView.setText("Hello, World!");
}
}
- Button Click Program. The following program displays a Button. When a user clicks on it, it displays a short message using the makeText() method of the Toast class.
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "Button clicked", Toast.LENGTH_SHORT).show();
}
});
}
}
- ListView Program. The following program displays a ListView. Also, it displays the array elements in that ListView.
public class MainActivity extends AppCompatActivity {
private ListView listView;
private String[] items = {"Apple", "Banana", "Orange", "Grape"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
listView = findViewById(R.id.list_view);
ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, items);
listView.setAdapter(adapter);
}
}
- WebView Program. The following program demonstrates a WebView control. Also, it opens the given URL in the WebView.
public class MainActivity extends AppCompatActivity {
private WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = findViewById(R.id.web_view);
webView.loadUrl("https://www.google.com");
}
}
- Camera Program. The following program allows the Camera to take pictures and displays the pictures in an ImageView control.
public class MainActivity extends AppCompatActivity {
private static final int REQUEST_IMAGE_CAPTURE = 1;
private ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = findViewById(R.id.image_view);
Button button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dispatchTakePictureIntent();
}
});
}
private void dispatchTakePictureIntent() {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
Bundle extras = data.getExtras();
Bitmap imageBitmap = (Bitmap) extras.get("data");
imageView.setImageBitmap(imageBitmap);
}
}
}
Further Reading
Introduction to Android App Development
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