Android Open Source - introToDroid4ed Events Activity

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License

The source code is released under:
GNU General Public License
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Java Source Code

package com.introtoandroid.viewsamples;
//w w  w.  j a v  a 2 s .co m

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.GestureDetector;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.Button;
import android.widget.TextView;

public class EventsActivity extends Activity {
    private String mSaveText = null;
    private GestureDetector mGestures = null;

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (mGestures != null) {
            return mGestures.onTouchEvent(event);
        } else {
            return super.onTouchEvent(event);
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
        setContentView(R.layout.events);
        
        /* events to demonstrate: touch mode changes
        events on entire screen long press gesture
        focus changes on views key events -- hmm...
        not working the way I thought, maybe skip
        */
        final TextView events = (TextView)findViewById(R.id.last_event_text);
        View all = findViewById(R.id.events_screen);
        ViewTreeObserver vto = all.getViewTreeObserver();
        
        vto.addOnTouchModeChangeListener(new ViewTreeObserver.OnTouchModeChangeListener() {
          public void onTouchModeChanged(boolean isInTouchMode) {
            events.setText("Touch mode: " + isInTouchMode);
          }
        });
        
      vto.addOnGlobalFocusChangeListener(new ViewTreeObserver.OnGlobalFocusChangeListener() {
        public void onGlobalFocusChanged(View oldFocus, View newFocus) {
              if (oldFocus != null && newFocus != null) {
                  events.setText("Focus \nfrom: " + oldFocus.toString() + " \nto: " + newFocus.toString());    
              }
          }
      });

      Button long_press = (Button)findViewById(R.id.long_press);
      
      long_press.setOnLongClickListener(new View.OnLongClickListener() {
          public boolean onLongClick(View v) {
              // we know what View already, use it anyway
              events.setText("Long click: " + v.toString());
              return true;
          }
      });
      
      mGestures = new GestureDetector(this, new GestureDetector.SimpleOnGestureListener() {
          @Override
          public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
                events.setText("Fling! \nx= " + velocityX + "px/s\ny="+velocityY + "px/s");
                return super.onFling(e1, e2, velocityX, velocityY);
          }
  
          @Override
          public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
              events.setText("Scroll! \nX = " + distanceX + "\nY = " +distanceY);
              return super.onScroll(e1, e2, distanceX, distanceY);
          }
      });
        
      TextView focus = (TextView)findViewById(R.id.text_focus_change);
      
      focus.setOnFocusChangeListener(new View.OnFocusChangeListener() {
          public void onFocusChange(View v, boolean hasFocus) {
              if (hasFocus) {
                  if (mSaveText != null) {
                      ((TextView)v).setText(mSaveText);
                  }
              } else {
                  mSaveText = ((TextView)v).getText().toString();
                  ((TextView)v).setText("");
              }
          }
      });
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
        return super.onKeyDown(keyCode, event);
    }

    @Override
    public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
        Log.d(ViewSampleActivity.debugTag, "Multi code = "+keyCode);
        return super.onKeyMultiple(keyCode, repeatCount, event);
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        // TODO Auto-generated method stub
        return super.onKeyUp(keyCode, event);
    }
}
Java Source Code List
