morodomi / Android-Lecture-3

Lecture for Activities.

##Author Masahiro Morodomi <morodomi at gmail.com>

##Description

Android Lecture 2 for Developers.

In this Lecture, you will learn how to use and customize Activity

##Requirements

• Eclipse IDE for Java Developers
• Android SDK
• Android 2.1 or higher

##Questions

• Passing a string value from FirstActivity to SecondActivity.

  ###FirstActivity

   Intent intent = new Intent(this, SecondActivity.class);
   intent.putExtras("key", "value");
   startActivity(intent);
   

  ###SecondActivity

   Bundle bundle = getIntent().getExtras();
   if(bundle !=null) {
       String value = bundle.getString("key");
   }
   

• Passing a string value from SecondActivity to FirstActivity

  ###FirstActivity

   int REQUEST_CODE = 123;
   Intent intent = new Intent(this, SecondActivity.class);
   startActivityForResult(intent, REQUEST_CODE);
   

  ###SecondActivity

   Intent intent = new Intent();
   Bundle bundle = new Bundle();
   bundle.putString("key", "value");
   intent.putExtras(bundle);
   setResult(RESULT_OK, intent);
   finish();
   

  ###FirstActivity

   @Override
   protected void onActivityResult(int requestCode,
           int resultCode, Intent data) {
       if(requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
           Bundle bundle = data.getExtras();
           String value = bundle.getString("key");
       }
   }
   

• Add activity transaction animation.

  Animation XML Sample

   <?xml version="1.0" encoding="utf-8"?>
   <scale
       xmlns:android="http://schemas.android.com/apk/res/android"
       android:interpolator="@android:anim/linear_interpolator"
       android:fromXScale="0.0"
       android:toXScale="1.0"
       android:fromYScale="1.0"
       android:toYScale="1.0"
       android:pivotX="50%"
       android:fillAfter="false"
       android:startOffset="200"
       android:duration="200" />
   

  Set Animation method

       startActivity(intent);
       overridePendingTransition(incomingAnimationId, 
               outgoingAnimationId);
   

• Add more activities. (Check AndroidManifest.xml)

• Move between these activities freely. (Including third one)

##Presentation Slides (Japanese only) http://dl.dropbox.com/u/54119179/Android/android-lecture-3.html

##License Copyright (c) on 2012, Masahiro Morodomi

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied.

See the License for the specific language governing permissions and
limitations under the License.