Android Learning Notes

Tuesday, September 11, 2012

EMMA

C:\Program Files\Android\android-sdk\tools\ant\build.xml


<property name="emma.dump.file"
value="/sdcard/coverage.ec" />




java emma merge -input coverage.em,coverage.ec -out module1.es
java emma merge -input module1.es,module2.es -out all.es
java emma report -r txt,html -in all.es -sp c:\workspace\project\src

Wednesday, August 17, 2011

What can be done in Intent ?

17 Aug 2011
How to pass Object from Activity A to B ?


import java.util.*;

import android.os.*;



public class Data implements Parcelable {

public int value = 0;

	

public Data() {}

	

private Data(Parcel in) {

 value = in.readInt();

}

	

public int describeContents() {

 return 0;

}

	

public void writeToParcel(Parcel out, int flags) {

 out.writeInt(value);

}

	

public static final Parcelable.Creator CREATOR = new Parcelable.Creator() {

 public Data createFromParcel(Parcel in) {

   return new Data(in);

 }



 public Data[] newArray(int size) {

   return new Data[size];

 }

};

}





Intent intent = new Intent(ActivityA.this, Activity.class);

intent.putExtra("data", data);

startActivityForResult(intent, 0);





Intent i = getIntent();

Data data = (Data) i.getParcelableExtra("data");

20 June 2011
How to choose Email writer and fill in ?

Intent i = new Intent(Intent.ACTION_SEND);

i.setType("text/plain");

i.putExtra(Intent.EXTRA_EMAIL, "youremail@domain.com");

i.putExtra(Intent.EXTRA_SUBJECT, "subject");

i.putExtra(Intent.EXTRA_TEXT, "message");

startActivity(Intent.createChooser(i, "Select email application."));

30 Sep 2010
How to open a System Screen ?

startActivityForResult(new Intent(Settings.ACTION_SOUND_SETTINGS), 0);

16 Aug 2010
How to open an URL in a native browser ?

Intent intent = new Intent(Intent.ACTION_VIEW);

intent.setData(Uri.parse("http://www.google.com/"));

startActivity(intent);

How to make a call ?

String url = "tel:1234567";

startActivity(new Intent(Intent.ACTION_CALL, Uri.parse(url)));

How to go to Dial keyword to make a call ?

String url = "tel:1234567";

Intent callIntent = new Intent(Intent.ACTION_DIAL, Uri.parse(url));

startActivity(callIntent);

Thursday, June 30, 2011

What to do with AndroidManifest.xml ?

30 June 2011
How to prevent onCreate() from being called when the orientation is changed ?

<activity name="YourActivity" android:configChanges="orientation|keyboardHidden" />

16 Aug 2010
How to allow to access internet ?

<uses-permission android:name="android.permission.INTERNET" />

How to disable orientation change ?

android:screenOrientation="nosensor"

Do not show softkeyboard on Activiry showing ?

<activity name="YourActivity" android:windowSoftInputMode="stateHidden" />

Tuesday, June 28, 2011

How to do them in View ?

16 June 2011
How to remove the button shape of an ImageButton ?

android:background="@null"

07 Sept 2010
How to create Full Screen activity ?


requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.xxx);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

16 Aug 2010
How to know about screen width and height ?


Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight();

How to show an Alert ?


AlertDialog dialog = new AlertDialog.Builder(this)
  .setMessage(R.string.message)
  .setPositiveButton(R.string.yes,
    new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int which) {
      }
    }
  )
  .setNegativeButton(R.string.no, 
    new DialogInterface.OnClickListener() {
      public void onClick(DialogInterface dialog, int which) {
      }
    }
  ).create();
dialog.show();

Monday, June 20, 2011

What to do in I/O and File ?

18 June 2011

How to unzip a .zip file ?


public static void unzip(String filePath, InputStream is) {
  ZipInputStream in = null;
  try {
    in = new ZipInputStream(is);
    for (ZipEntry entry = in.getNextEntry(); entry != null; entry = in.getNextEntry()) {
      if (entry.isDirectory()) {
        File file1 = new File(filePath + entry.getName());
        file1.mkdir();
      } else {
        FileOutputStream outputfile = new FileOutputStream(filePath + entry.getName());
        int data = 0;
        while ((data = in.read()) != -1) {
          outputfile.write( data );
        }
        outputfile.close();
      }
    }
  } catch (IOException e) {
  } finally {
    try {
      if (in != null) {
        in.close();
      }
    } catch (IOException ignored) {
    }
    in = null;
  }
}

Friday, June 17, 2011

What to do in Storage ?

18 June 2011
How to save and use a pair of key and value in a reference ?


SharedPreferences settings = getSharedPreferences("settings", 0);
SharedPreferences.Editor editor = settings.edit();
editor.putString("name", "yourname");
editor.commit();  

String url = settings.getString("name", "noname");