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Get Screen Size Pixels per Inch Android example


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The exact physical pixels per inch of the screen
Get size of pixel
Get DPI
Get count of pixels per inch

        float mXDpi;
        float mYDpi;
           DisplayMetrics metrics = new DisplayMetrics();
            getWindowManager().getDefaultDisplay().getMetrics(metrics);
            mXDpi = metrics.xdpi; // The exact physical pixels per inch of the screen in the X dimension. 
            mYDpi = metrics.ydpi;
          float  mMetersToPixelsX = mXDpi / 0.0254f; // 1 inch == 0.0254 metre
          float  mMetersToPixelsY = mYDpi / 0.0254f;



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228

Eclipse "id cannot be resolved or is not a field” error Android | eclipse-id-cannot-be-resolved-or-is-not-a-field-error-android


"id cannot be resolved or is not a field” error
If you copy project to workspace or some code from other project you can get this error.

Try remove or add import your R file:

import com.example.app.R


Check xml files.
Clean project by menu Project-Clean

Maybe you have to create new project end copy old source files to new project folders.
389

Expected resource of type raw drawable | expected-resource-of-type-raw-drawable


Try insert + before R.drawable.xxxx

// error
InputStream is = context.getResources().openRawResource(R.drawable.app_sample_code);

// ok
InputStream is = context.getResources().openRawResource(+R.drawable.app_sample_code);

187

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


menu-item-project-properties-eclipse
order-and-export-eclipse dialogue
eclipse-add-jar-library-to-project
322

View overrides onTouchEvent but not performClick | view-overrides-ontouchevent-but-not-performclick



public class Panel extends SurfaceView implements SurfaceHolder.Callback {
//............... code
//............... some code
   /**
     * Process the MotionEvent.
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
    	
        synchronized (getHolder()) {
            if (event.getAction() == MotionEvent.ACTION_DOWN) {
            	performClick();
             } else if (event.getAction() == MotionEvent.ACTION_MOVE) {
            	if(_currentGraphic==null)return true;
                
            } else if (event.getAction() == MotionEvent.ACTION_UP) {
            }
            return true;
        }
    }
/////////////////////////////
 @Override
 public boolean performClick() {
  // Calls the super implementation, which generates an AccessibilityEvent
        // and calls the onClick() listener on the view, if any
        super.performClick();

        // Handle the action for the custom click here

        return true;
 }

}

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>


Editace: 2013-12-09 13:06:15
Počet článků v kategorii: 397
Url:get-screen-pixels-android-example

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