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ListView add item click item basic Android example code


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Definition of ListView in layout main.xml file Android example



<ListView android:id="@+id/idListView"
        android:background="#7700CC00"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent" /> 



Code in Main.java ListView example source code Java Android

public class Main extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        ListView mlistView = (ListView) findViewById(R.id.idListView);
        mlistView.setAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_1, 
                new String[] {"Game", "Help", "Home site"}));
    
        mlistView.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
              // When clicked, show a toast with the TextView text Game, Help, Home
              Toast.makeText(getApplicationContext(), ((TextView) view).getText(),
                  Toast.LENGTH_SHORT).show();
            }
          });
     }
}



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2

Click Handler | click-handler-android-code


Click Handler Android Java example source code. Open new class as activity and open URL in browser.
In layout.xml file:



In string.xml

myClickHandler



In MainClass.java file

	public void myClickHandler(View view) {
		switch (view.getId()) {
		// open new class as activity
		case R.id.btnOpenClass: {
				Intent pictureActivity = new Intent(getBaseContext(),
						MyClass.class);
				startActivity(pictureActivity);
		}
		break;			
			
		case R.id.btnAbout: {
			//aboutDialogCreate();
		}
			break;
			
		// open url	
		 case R.id.btnHome: {
		 String url = "//android.okhelp.cz/";
		 Intent i = new Intent(Intent.ACTION_VIEW);
		 i.setData(Uri.parse(url));
		 startActivity(i);
		 }break;

		}

	}// end myClickHandler

// listener .. if click on button will scrolling to mTextView bottom
private OnClickListener mButtonListener = new OnClickListener() {
	    public void onClick(View v) {
	      // do something when the button is clicked
	    int nBottom =	mTextView.getBottom();
	    hScrollView.scrollTo(0, nBottom);
	    }
	};

96

onSaveInstanceState() onRestoreInstanceState() basic Android example | onsaveinstancestate-onrestoreinstancestate-basic-android-example



public class MyClass extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
       }
	 String sMyText = "some text";
	 int nMyInt = 10;

 @Override
 protected void onSaveInstanceState(Bundle outState) {
     // Save away the original text, so we still have it if the activity
     // needs to be killed while paused.
     outState.putString("my_text", sMyText);
     outState.putInt("my_int", nMyInt);
     Toast.makeText(this, "onSaveInstanceState()", Toast.LENGTH_LONG).show();
Log.i("onSaveInstanceState", "onSaveInstanceState()");
}
 String sNewMyText = "";
 int nNewMyInt = 0;
 
 @Override
 protected void onRestoreInstanceState(Bundle savedInstanceState) {
     super.onRestoreInstanceState(savedInstanceState);
     // restore saved values
     sNewMyText = savedInstanceState.getString("my_text");
     nNewMyInt = savedInstanceState.getInt("my_int");
     Toast.makeText(this, "onRestoreInstanceState()", Toast.LENGTH_LONG).show();
     Log.i("onRestoreInstanceState", "onRestoreInstanceState()");
     
 }
}
153

Rotate Canvas with Bitmap Android example | rotate-canvas-with-bitmap-android-example


drawPath, canvas.rotate, lineTo basic Android example for your testing.





canvas-rotate-image-android-1


canvas-rotate-image-android




// //www.apache.org/licenses/LICENSE-2.0
// The Android Open Source Project
public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(new SampleView(this));
	}

	private static class SampleView extends View {
		private Paint mPaint = new Paint();
		private Path mPath = new Path();

		// CONSTRUCTOR
		public SampleView(Context context) {
			super(context);
			setFocusable(true);

			// Construct a wedge-shaped path
			mPath.moveTo(0, -60);
			mPath.lineTo(-20, 80);
			mPath.lineTo(0, 60);
			mPath.lineTo(20, 80);
			mPath.close();
		}

		@Override
		protected void onDraw(Canvas canvas) {
			Paint paint = mPaint;

			canvas.drawColor(Color.WHITE);

			paint.setAntiAlias(true);
			paint.setColor(Color.RED);
			paint.setStyle(Paint.Style.FILL);
			Bitmap bitmapOrg = BitmapFactory.decodeResource(getResources(),
					R.drawable.flower_blue);
			canvas.drawBitmap(bitmapOrg, 10, 10, paint);
			int w = canvas.getWidth();
			int h = canvas.getHeight();
			int cx = w / 2;
			int cy = h / 2;

			canvas.translate(cx, cy);
         // uncomment next line 
			//canvas.rotate(90.0f);
			canvas.drawPath(mPath, mPaint);
		}

	}
}
211

The container JRE System Library JavaSE references non existing library | the-container-jre-system-library-javase-references-non-existing-library


Eclipse Error: The container JRE System Library JavaSE references non existing library QTJava.zip

Workaround:
Windows->Preferences->Java->Installed JRE
Press Add and select your JRE folder path for example:
c:\Program Files\Java\jre7\
and check your choice.

eclipse instaled jres path dialog
269

Eclipse - How open deleted project from workspace | eclipse-how-open-deleted-project-from-workspace


If project is in workspace and only not visible in project explorer using this:



Click on some project in project explorer
Menu:
File
Import project
Existing Projects into Workspace




Editace: 2011-09-16 11:48:11
Počet článků v kategorii: 397
Url:listview-add-item-click-item-basic-android-example-code

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