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Bitmap Canvas Color Gradient linear radial sweep rounded corner Android example


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public class MainActivity extends Activity {
//  //www.apache.org/licenses/LICENSE-2.0
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(new SampleView(this));
	}

	   private static class SampleView extends View {
	        private Rect    mRect;
	        private GradientDrawable mDrawable;

	        public SampleView(Context context) {
	            super(context);
	            setFocusable(true);

	            mRect = new Rect(0, 0, 220, 120);
	      
/*	            GradientDrawable.Orientation  BL_TR  draw the gradient from the bottom-left to the top-right   
	              BOTTOM_TOP  draw the gradient from the bottom to the top   
	              BR_TL  draw the gradient from the bottom-right to the top-left   
	              LEFT_RIGHT  draw the gradient from the left to the right   
	              RIGHT_LEFT  draw the gradient from the right to the left   
	              TL_BR  draw the gradient from the top-left to the bottom-right   
	              TOP_BOTTOM  draw the gradient from the top to the bottom   
	              TR_BL  draw the gradient from the top-right to the bottom-left   
*/
	            
	            mDrawable = new GradientDrawable(GradientDrawable.Orientation.LEFT_RIGHT,
	                                             new int[] { 0xFFFF0000, 0xFF00FF00,
	                                                 0xFF0000FF });
	            mDrawable.setShape(GradientDrawable.RECTANGLE);
	            mDrawable.setGradientRadius((float)(Math.sqrt(2) * 60));
	        }
	        
	        static void setCornerRadius(GradientDrawable drawable, float r0,
	                                   float r1, float r2, float r3) {
/*	        	setCornerRadii
	        	Specify radii for each of the 4 corners. For each corner, 
	        	the array contains 2 values, [X_radius, Y_radius]. 
	        	The corners are ordered top-left, top-right, bottom-right, 
	        	bottom-left 
*/
	            drawable.setCornerRadii(new float[] { r0, r0, r1, r1,
	                                                  r2, r2, r3, r3 });
	        }
	        
	        @Override protected void onDraw(Canvas canvas) {
	            
	            mDrawable.setBounds(mRect);

	            float r = 35;
	            
	            canvas.save();
	            canvas.translate(10, 10);
	            mDrawable.setGradientType(GradientDrawable.LINEAR_GRADIENT);
	            setCornerRadius(mDrawable, r, r, 0, 0);
	            mDrawable.draw(canvas);
	            canvas.restore();
	            
	            canvas.translate(0, mRect.height() + 10);
	            canvas.save();
	            canvas.translate(10, 10);
	            mDrawable.setGradientType(GradientDrawable.RADIAL_GRADIENT);
	            setCornerRadius(mDrawable, 0, 0, r, r);
	            mDrawable.draw(canvas);
	            canvas.restore();
	            
	            canvas.translate(0, mRect.height() + 10);
	            canvas.save();
	            canvas.translate(10, 10);
	            mDrawable.setGradientType(GradientDrawable.SWEEP_GRADIENT);
	            setCornerRadius(mDrawable, 0, r, r, 0);
	            mDrawable.draw(canvas);
	            canvas.restore();
	            
	            
	        }
	    }
	}


android/gradient-bitmap-rounded.png

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392

Unchecked call to add(E) as a member of raw type java.util.List | unchecked-call-to-adde-as-a-member-of-raw-type-java-util-list



// warnning
private List list = new ArrayList();

// ok /put type of added object
private List<String> list = new ArrayList<String>();
42

Scroll to certain position on application Android example code | scroll-to-certain-position-on-application-android-example-code


ScrollTo(), getTop(), getBottom(), getLeft(), getRight(), ScrollView, LinearLayout Android Java xml example.
How get position of a View.
MainClass.java

/*
public void scrollTo (int x, int y) 
Since: API Level 1 
Set the scrolled position of your view. This will cause a call to onScrollChanged(int, int, int, int) and the view will be invalidated. 

This version also clamps the scrolling to the bounds of our child.

Parameters
x  the x position to scroll to 
y  the y position to scroll to  
  */

// sroll to top of hscrollViewMain
ScrollView hscrollViewMain = (ScrollView)findViewById(R.id.scrollViewMain);
hscrollViewMain.scrollTo(0, 0); // scroll to application top

// get position of a View
EditText hEdit = (EditText)findViewById(R.id.username_edit);
int nY_Pos = hEdit.getTop(); // getBottom(); X_pos  getLeft(); getRight();
// scroll to top of hEdit
hscrollViewMain.scrollTo(0,nY_Pos); 


main.xml


<LinearLayout
    xmlns:android="//schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">
    <ScrollView
        android:id="@*id/scrollViewMain"
        android:layout_width="fill_parent"
        android:layout_height="0dip"
        android:layout_weight="1">
        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:orientation="vertical"
            android:paddingTop="5dip"
            android:paddingBottom="13dip"
            android:paddingLeft="20dip"
            android:paddingRight="20dip">
            <TextView
                android:id="@+id/message"
                android:textAppearance="?android:attr/textAppearanceSmall"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginBottom="5dip" />
            <TextView
                android:textAppearance="?android:attr/textAppearanceSmall"
                android:textStyle="bold"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="@string/login_activity_username_label" />
            <EditText
                android:id="@+id/username_edit"
                android:singleLine="true"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:minWidth="250dip"
                android:scrollHorizontally="true"
                android:capitalize="none"
                android:autoText="false"
                android:inputType="textEmailAddress" />
        </LinearLayout>
    </ScrollView>

</LinearLayout>
332

SimpleCursorAdapter deprecated | simplecursoradapter-deprecated


Constructor SimpleCursorAdapter is deprecated.
If using api 11 and above, you can try add last parameter 0.


Cursor cursor = managedQuery(...........,,,,);
// Specify the columns we want to display in the result
            String[] from = new String[] { KEY_WORD,
                                           KEY_DEFINITION };

            // Specify the corresponding layout elements where we want the columns to go
            int[] to = new int[] { R.id.word,
                                   R.id.definition };
// deprecated 
 SimpleCursorAdapter words =
            new SimpleCursorAdapter(this,
                    R.layout.result, cursor, from, to);
// working
 SimpleCursorAdapter words =
            new SimpleCursorAdapter(this,
                    R.layout.result, cursor, from, to, 0); // to, 0!!!!


//working in Fragment
SimpleCursorAdapter  mAdapter = new SimpleCursorAdapter(getActivity(),
                android.R.layout.simple_list_item_2, null,
                new String[] { "name", "age" }, // cursor parameters
                new int[] { android.R.id.text1, android.R.id.text2 }, 0);


186

NoClassDefFoundError: com.google.ads.AdView ADT 17 | noclassdeffounderror-com-google-ads-adview-adt-17


Eclipse update ADT 17 Android Emulator error: E/AndroidRuntime(370): java.lang.NoClassDefFoundError: com.google.ads.AdView

Solution:
-right click on the project in project tree and select Project properties
-select Java Build Path
-select TAB Order and Export
-check GoogleAdMobAdsSdk-4.0.4.jar (or your version SDK)
-press OK
-clean project by menu Project -> Clean
-rebuild project (Project - Build Automatically)

How add GoogleAdMobAdsSdk....jar to project:
-right click on the project in project tree and select Project properties
-select Java Build Path
-select TAB Libraries
-press the button Add External JARs...
-select your version GoogleAdMobAdsSdkXXX.jar what you can using
-OK
-OK
-clean project
-rebuild project


android/menu-project-properties-eclipse.png
android/order-and-export-eclipse.png
android/eclipse-add-jar-library-to-project.png
222

Disable enable internet connection in Android Emulator | disable-enable-internet-connection-in-android-emulator


If you try function for checking internet connection you can disable internet on the emulator:
Settings - Wireless and networks - Mobile networks - Data enabled (checked - unchecked )


 public boolean isNetworkAvailable() {
        ConnectivityManager cm = (ConnectivityManager) 
          getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = cm.getActiveNetworkInfo();
        if (networkInfo != null && networkInfo.isConnected()) {
            return true;
        }
        return false;
    }