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Scroll to certain position on application Android example code


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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>

397LW NO topic_id




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HorizontalScrollView ScrollView horizontal vertical Android xml example | horizontalscrollview-scrollview-horizontal-vertical-android-xml-example


HorizontalScrollView ScrollView LinearLayout horizontal vertical Android xml basic example and image.

[caption id="attachment_889" align="alignleft" width="200" caption="horizontal scrollview horizontalscrollview android"]horizontalscrollview-android[/caption]


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:id="@+id/LinearLayout01"
	android:layout_width="fill_parent" android:layout_height="fill_parent"
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			<LinearLayout android:id="@+id/LinearLayout02"
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Other sample


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="//schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:id="@+id/layout"
    android:orientation="vertical" >

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        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <LinearLayout
            android:id="@+id/linearLayout1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="horizontal" >
        <TextView
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="Hello world! First TextView" />

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
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        </LinearLayout>



    </HorizontalScrollView>

</LinearLayout>

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Change table row background color if user click on row Android example code.
MainActivity.java

public class MainActivity extends Activity {
Boolean bColorYellow = true;
TextView hTextView;
TableRow hTableRow;
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    } // end onCreate
  
    
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main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="//schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >


<TableLayout android:layout_height="wrap_content" android:layout_width="fill_parent" android:id="@+id/tableLayout1">
    <TableRow android:id="@+id/idTableRow1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:background="#5655AA"
    android:onClick="@string/myTableRowClick"
    android:focusable="true">
<TextView  
	android:id="@+id/idTextView"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
    
    </TableRow>
</TableLayout>
    
    
</LinearLayout>



strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World!</string>
    <string name="app_name">TableRow</string>
    <string name="myTableRowClick">myTableRowClickHandler</string>
</resources>






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   private void fillBitmapCache() {
        _bitmapCache.put(R.drawable.icon, BitmapFactory.decodeResource(getResources(), R.drawable.icon));
        _bitmapCache.put(R.drawable.abstrakt, BitmapFactory.decodeResource(getResources(), R.drawable.abstrakt));
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        _bitmapCache.put(R.drawable.scissors, BitmapFactory.decodeResource(getResources(), 
    }

Bitmap bm = _bitmapCache.get(R.drawable.icon);

Lint warning:
Use new SparseArray(...) instead for better performance
Issue: Looks for opportunities to replace HashMaps with the more efficient SparseArray
Id: UseSparseArrays

New code with SparseArray

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   private void fillBitmapCache() {
        _bitmapCache.put(R.drawable.icon, BitmapFactory.decodeResource(getResources(), R.drawable.icon));
        _bitmapCache.put(R.drawable.abstrakt, BitmapFactory.decodeResource(getResources(), R.drawable.abstrakt));
        _bitmapCache.put(R.drawable.wallpaper, BitmapFactory.decodeResource(getResources(), R.drawable.wallpaper));
        _bitmapCache.put(R.drawable.scissors, BitmapFactory.decodeResource(getResources(), 
    }

Bitmap bm = _bitmapCache.get(R.drawable.icon);


SparseArray methods:
//developer.android.com/reference/android/util/SparseArray.html


Editace: 2011-09-20 15:29:14
Počet článků v kategorii: 397
Url:scroll-to-certain-position-on-application-android-example-code

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