Importing google-play-service library project to workspace issue

putString(), putBoolean(), putInt() etc.¨
How we can start an activity programmatically.

// MainActivity.java
//  myButton.setOnClickListener
Intent binary = new Intent(getApplicationContext(),Calculate.class);
	Bundle b = new Bundle();
	b.putString("prvni_label", "Decimal");
	b.putString("druhy_label", "Binary");
	b.putString("mode", "binary_to_decimal");
        binary.putExtras(b);
	startActivityForResult(binary, 0);
						
// in Calculate.java onCreate

   TextView mTextView1 = (TextView)findViewById(R.id.textView1);
   TextView mTextView2 = (TextView)findViewById(R.id.textView2);    
     Bundle _bundle = getIntent().getExtras();
		mTextView1.setText(_bundle.getString("prvni_label"));
		mTextView2.setText(_bundle.getString("druhy_label"));

//.................. HOW OPEN START NEW ACTIVITY WITHOUT A PARAMETER .........................

startActivity(new Intent(ThisActivity.this, NewActivity.class));

Difference between "@+id/” and "@id/” in Android
android:id="@+id/xxx" unique identifier of view
@id/ a reference to the unique identifier

 <TextView
        android:id="@+id/first_element_id"
        .........
 />
    <TextView
        android:id="@+id/second_element_id"
        android:layout_below="@id/first_element_id"
        ..........
 />

Very very quick start of Android Emulator from Eclipse.

1. Go to Eclipse s menu Window -> Android SDK and AVD Manager


2. Select Virtual devices


3. Select check box Snapshot: Enabled


4. Press Edit AVD button.

If will closed Android Emulator all data will saved on disk.
If will reopen Android Emulator, configuration and data will read from disk.


[caption id="attachment_768" align="alignleft" width="300" caption="android-emulator-enable-quick-start"][/caption]

Check this in XML file if use singleLine
singleLine change to maxLines (1 if singleLine)
declare inputType

        android:maxLines="1"
        android:inputType="text"

Landscape - portrait orientation change:

boolean mbOrientationLandscape = true;
if(mbOrientationLandscape ){
	setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
	mbOrientationLandscape =false;
}else{
	setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
	mbOrientationLandscape =true;
}