Android: How to Import the Android samples code

In Eclipse:
File -> New Project -> Android -> Android Sample Project

Android: Writing a Simple 2D Program.

1. Create a new Project.

2. Add a new View (SurfaceView) Class. (File -> New -> Class)


3. Add Constructor in the new Class.
 public Panel(Context context) {
  super(context);
  // TODO Auto-generated constructor stub
 }

4. Change Activity
 setContentView(R.layout.main);
to your new Class
 setContentView(new Panel(this));

5a. Add the onDraw for View

@Override
public void onDraw(Canvas canvas) {
    canvas.drawColor(Color.BLACK);
    canvas.drawBitmap(mBitmap, 10, 10, null);
}

5b. Add the Callback interface and Thread for SurfaceView

public class Panel extends SurfaceView implements SurfaceHolder.Callback {
 private AnimationThread mThread;
 
 public Panel(Context context) {
  super(context);
  // TODO Auto-generated constructor stub
     getHolder().addCallback(this);
     mThread = new AnimationThread(this);
 }
    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        // TODO Auto-generated method stub
    }
 
     @Override
    public void surfaceCreated(SurfaceHolder holder) {
        // TODO Auto-generated method stub
         if (!mThread.isAlive()) {
             mThread = new AnimationThread(this);
             mThread.setRunning(true);
             mThread.start();
         }
    }
 
    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        if (mThread.isAlive()) {
            mThread.setRunning(false);
        }
    }

    public void doDraw(Canvas canvas) {
        canvas.drawColor(Color.WHITE);
    }
}

public class AnimationThread extends Thread {

 public AnimationThread() {
  // TODO Auto-generated constructor stub
 }

    private Panel mPanel;
    private SurfaceHolder mHolder;
    private boolean mRun = false;

    public AnimationThread(Panel panel) {
        mPanel = panel;
        mHolder = mPanel.getHolder();
    }

    public void setRunning(boolean run) {
        mRun = run;
    }

    @Override
    public void run() {
        Canvas canvas = null;
        while (mRun) {
            canvas = mHolder.lockCanvas();
            if (canvas != null) {
                mPanel.doDraw(canvas);
                mHolder.unlockCanvasAndPost(canvas);
            }
        }
    }
}

Android: Adding style to a text (bold italic etc..)

import android.text.Html;

MyTest.setText(Html.fromHtml("<BIG><B>BIG BOLD</B></BIG><SMALL><I>Small italic</I></SMALL>Normal<BR>" );

Some Notes about Android APPs programming

Random number
import java.util.Random;
private static final Random rand = new Random();
rand.nextInt(xxx);
nextInt(int n) - Returns a pseudo-random uniformly distributed int in the half-open range [0, n).

Math Lab
import java.lang.Math;
Math.pow();

Create new class
In Eclipse, choose File → New → Class.
Type Class Name
Superclass
android.appActivity
android.database.sqlite.SQLiteOpenHelper
and check the box for “Constructors from superclass.”

android:textcolor
A color value, in the form of "#rgb", "#argb", "#rrggbb", or "#aarrggbb".
Example:
android:textcolor="#000"  or "#000000" => BLACK
android:textcolor="#FFF" or "#FFFFFF"  => WHITE
android:textcolor="#F00" or "#FF0000"  => RED
android:textcolor="#0F0" or #00FF00"  => GREEN
android:textcolor="#00F" or "#0000FF"  => BLUE

Android SurfaceView
1. Add new SurfaceView Class

2. Add new Thread Class name

3. Add code in the Thread
Override run()
4. Add code in the SurfaceView
Override surfaceCreated & surfaceDestroyed

Android Rotate Text
@Override
 public void onDraw(Canvas c) {
  super.onDraw(c);
// ........,.
  // Draw Rotated text
  paint.setColor(Color.RED); 
  paint.setTextSize(30); 
  String rotate_str = "Rotate TEXT";
  // rotate the canvas on center of the text to draw 
  c.rotate(45, 50, 50);  // rotate 45 at x = 50 and y = 50
  // draw the rotated text 
  paint.setStyle(Paint.Style.FILL); 
  c.drawText(rotate_str, 50, 50, paint); 
  //undo the rotate 
  c.restore();
// ..........

Android Draw using View Class
MyView.java
package com.hong.testing;
import android.app.Activity;
import android.os.Bundle;
public class MyView extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new Panel(this));    }
}
panel.java
package com.hong.testing;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.view.View;
class Panel extends View {

 public Panel(Context context) {
  super(context);
 }

 @Override public void onDraw(Canvas c) {
  super.onDraw(c);
  Paint paint = new Paint(); 
  paint.setStyle(Paint.Style.FILL);
  // make the entire canvas white 
  paint.setColor(Color.WHITE); 
  c.drawPaint(paint);

     // Draw Line     paint.setColor(Color.LTGRAY);
     paint.setStrokeWidth(3);
     paint.setColor(Color.LTGRAY);
     c.drawLine(0, 0, c.getWidth()-1, c.getHeight()-1, paint);
     c.drawLine(c.getWidth()-1, 0,0 , c.getHeight()-1, paint);
  // Put Bitmap  Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon);
     c.drawBitmap(bitmap, 10, 10, null);
   
  // Draw a blue circle  paint.setAntiAlias(true); 
  paint.setColor(Color.BLUE); 
  c.drawCircle(20, 20, 10, paint);  // x = 20, y = 20 radius = 10
  // Draw a green rectangle  paint.setColor(Color.GREEN); 
  c.drawRect(35, 10, 60, 30, paint); // x1 = 35, y1 = 10, x2 = 60, y2 = 30

  // Draw red text   paint.setColor(Color.RED); 
  paint.setStyle(Paint.Style.FILL); 
  paint.setAntiAlias(true); 
  paint.setTextSize(30); 
  c.drawText("Text Drawing", 30, 100, paint);
  }   
}

Some notes about Android APPs

Android Tools
Android Tools are located in the following directory. (e.g. adb)
C:\Program Files\Android\android-sdk\platform-tools
C:\Program Files\Android\android-sdk\tools

Android locatiziation
Examples for locatiziation setting
 res/drawable
 res/drawable-hdpi
 res/drawable-ldpi
 res/drawable-mdpi
 res/drawable-nodpi
 res/drawable-de
 res/drawable-de-rCH
 res/drawable-fr-rFR
 res/drawable-fr-rCA
 res/drawable-en-rCA
 res/drawable-ja-rJP
 res/drawable-en-rUS
 res/layout
 res/layout-land
 res/values
 res/values-de/strings.xml
 res/values-fr/strings.xml
 res/values-ja/strings.xml

Some Notes about Android AndroidManifest.xml

Android Light Theme
Add in AndroidManifest.xml
        <activity android:name=".MathCal"
                  android:label="@string/app_name"
                  android:screenOrientation="portrait"
                  android:theme="@android:style/Theme.Light">
            <intent-filter>

Android Screen Orientation
<activity android:name=".MathCal"
              android:label="@string/app_name"
              android:screenOrientation="landscape"
              >
android:screenOrientation=["unspecified" | "user" | "behind" | "landscape" | "portrait" | "sensor" | "nosensor"]

Enabling the Android Move To SD Card Feature
Edit the AndroidManifest.xml file of the application to add an entry for “android:installLocation” to the <manifest> tag:
<manifest xmlns:android="http://schemas.android.com/apk/res/android" ......... android:installLocation="auto">
Keep the “minSdkVersion” the same as before; it need not be 8 to match Android 2.2

Android APPS without Title / Fullscreen
If you want your Anddroid APPS without tilte, change androidmanifest.xml  Theme
android:theme="@android:style/Theme.NoTitleBar"
If you want your Android APPS without tilte and fullscreen, change androidmanifest.xml Theme
android:theme="@android:style/Theme.NoTitleBar.Fullscreen"

My Samsung Galaxy ACE

My Phone
Version 2.3.4 GINGERBREAD.ZSKPD

Recovery Mode
- Holding the Middle button and then Power On the device.

Screenshots
- Press the right soft key (back button)
- While holding step one, press the centre button (physical key)
- The images will going to your SD card folder called “ScreenCapture”.

Change Input Mode
- Tap and hold the text input field and select Input method

How to force install apps to SD card without ROOT
- "cd C:\android-sdk-windows\platform-tools"
- "adb devices"
- "adb shell"
    A $ sign should pop up
- "pm setInstallLocation 2"
    Another $ should pop up

SVN Software

When we want to download some source code, we need to use SVN.

I have tried Tortoise SVN and it is integrated into the Windows explorer.

To use it, open the explorer and right-click on the folder you like and find "SVN Checkout".

APK Tools

APKTOOL

DEX2JAR

JD-GUI