Mobile Software Engineering Crash Course - C04 Android Cont.

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Mobile Software Engineering Crash Course - C04 Android Cont.

  1. 1. Mobile Software EngineeringL04 – Android Cont. Mohammad Shaker FIT of Damascus - AI dept. MohammadShakerGtr@gmail.com Mobile SE – August 2012
  2. 2. ActivitiesStarting Another Activity
  3. 3. Intentan object that provides runtime binding between separate components (such as two activities)
  4. 4. Intentcarry a collection of various data types as key-value pairs called extras through putExtra()
  5. 5. It’s a good practice..to define keys for intent extras using your apps package name as a prefix. This ensures they are unique, in case your app interacts with other apps.
  6. 6. Starting Another Activityhttp://developer.android.com/training/basics/firstapp/starting-activity.html#BuildIntent Project Attached
  7. 7. Starting Another Activitypublic final static String EXTRA_MESSAGE ="com.example.intetsample.MESSAGE";public void sendMessage(View view) { Intent intent = new Intent(this, DisplayMessageActivity.class); EditText editText = (EditText) findViewById(R.id.editText1); String message = editText.getText().toString(); intent.putExtra(EXTRA_MESSAGE, message); startActivity(intent); }
  8. 8. AndroidManifest.xml
  9. 9. AndroidManifest.xml<application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" > <activity android:name=".MainActivity" android:label="@string/title_activity_main" > <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".DisplayMessageActivity" android:label="@string/title_activity_display_message" > <meta-data android:name="android.support.PARENT_ACTIVITY" android:value="com.example.intetsample.MainActivity" /> </activity> </application>
  10. 10. Managing the Activity Life Cycle
  11. 11. Destroy the activity onDestroy()
  12. 12. Destroy the activity
  13. 13. onPasue() @Override public void onPause() { // Always call the superclass method first super.onPause(); // Release the Camera because // we dont need it when paused // and other activities might need to use it. if (mCamera != null) { mCamera.release() mCamera = null; } }
  14. 14. onResume() @Override public void onResume() { // Always call the superclass method first super.onResume(); // Get the Camera instance as the activity // achieves full user focus if (mCamera == null) { // Local method to handle camera init initializeCamera(); } }
  15. 15. Recreating activity onSaveInstanceState
  16. 16. Storage – Database Sqlite3
  17. 17. Draggable stick project sample attached
  18. 18. OpenGL ES
  19. 19. How can we animate?
  20. 20. Must Override a Superclass Method Errors after importing a project into Eclipse Problemhttp://stackoverflow.com/questions/1678122/must-override-a-superclass- method-errors-after-importing-a-project-into-eclips
  21. 21. @Overridepublic boolean onTouchEvent(MotionEvent e) { float x = e.getX(); float y = e.getY(); switch (e.getAction()) { case MotionEvent.ACTION_MOVE: float dx = x - mPreviousX; float dy = y - mPreviousY; // reverse direction of rotation above the mid-line if (y > getHeight() / 2) { dx = dx * -1 ; } // reverse direction of rotation to left of the mid-line if (x < getWidth() / 2) { dy = dy * -1 ; } mRenderer.mAngle += (dx + dy) * TOUCH_SCALE_FACTOR; // = 180.0f / 320 requestRender(); } mPreviousX = x; mPreviousY = y; return true;}
  22. 22. Let’s get our hands dirty with code!
  23. 23. Advanced Training• Making Your App Location Aware• Performing Network Operations• Transferring Data Without Draining the Battery• Syncing to the Cloud• Designing for Multiple Screens• Improving Layout Performance• Managing Audio Playback• Optimizing Battery Life• Creating Custom Views• Adding Search Functionality• Remembering Users• Sharing Content• Capturing Photos• Maintaining Multiple APKs• Creating Backward-Compatible UIs• Developing for Enterprise• Monetizing Your App• Designing Effective Navigation• Implementing Effective Navigation• Designing for TV• Displaying Bitmaps Efficiently• Implementing Accessibility• Displaying Graphics with OpenGL ES
  24. 24. See you nxt time!

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