ANDROID SOFTWARE DEVELOPMENT

1. ANDROID APPLICATION DEVELOPMENT ANDROID software development

2. Intro | platform overview Multiple instances of DVM can run in parallel runs .dex files (not .class/.jar)

3. Apps | activity • Base class mostly for visual components • extends Activity • override onCreate

4. Apps | activity /* interface.xml */ • <?xmlversion=“1.0”encoding=“utf-8”?> • <LinearLayout • xmlns:android=“http://schemas.android.com/apk/res/android” • android:orientation=“vertical” • android:layout_width=“fill_parent” • android:layout_height=“fill_parent”> • <TextView • android:id=“@+id/componentName” • android:layout_width=“fill_parent” • android:layout_height=“wrap_content” • android:text=“Text that will be displayed.” • />

5. Apps | intent • @Override • public void onCreate(Bundle savedInstanceState) { • super.onCreate(savedInstanceState); • setContentView(R.layout.main); • // Button listener • Button btnStart = (Button) findViewById(R.id.btn_start); • btnStart.setOnClickListener(newView.OnClickListener() { • public void onClick(View view) { • Intent intent = • new Intent(CurrentActivity.this, OtherActivity.class); • startActivity(intent); • } • }); • }

6. Apps | handler • privateHandler mHandler= new Handler(); • privateColor mColor= Color.BLACK; • private Runnable mRefresh = new Runnable() { • public void run() { • mTextViewOnUI.setBackgroundColor(mColor) • }}; • privateThreadmCompute = newThread(Runnable() { • public void run() { • while(1){ • mColor = cpuIntensiveColorComputation(...); • mHandler.post(mRefresh); • } • }}); • public voidonCreate(Bundle savedInstanceState) { • mCompute.start(); • }

7. Apps | R.java • Autogenerated, best if not manually edited • gen/

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