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Indicator for ExpandableListView ?

Explain how to used group indicator for custom ExpandableListView in android. you should be add line of code in group view in custom Adapter class.


int imageResourceId = isExpanded ? android.R.drawable.arrow_up_float : android.R.drawable.arrow_down_float;
image.setImageResource(imageResourceId);
image.setVisibility(View.VISIBLE);







ExpandableListView Example











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Print HTML document and webpage in android application.



Printing an html doc with webview involves loading an
html res or building an html doc as a string.







Creating custom print view step by step







1.       Creat
a webviewclient that starts a print job after the html res is loaded.



2.       Load
the html res into the webview object.







private WebView testWebView;



private void TestWebViewPrint() {

    // Create a WebView object specifically for printing

    WebView webView = new WebView(this);

    webView.setWebViewClient(new WebViewClient() {



        public boolean shouldOverrideUrlLoading(WebView view, String url) {

            return false;

        }



        @Override

        public void onPageFinished(WebView
view, String url) {

            Log.i("TAG", "page finished loading " + url);

            createTestWebPrintJob(view);

            testWebView = null;

        }

    });



    // Generate an HTML document on the fly:

    String htmlDocument = "

Test
Content

Androidbeginner tutorial point, " +

            "Hello, Hello...



";

    webView.loadDataWithBaseURL(null, htmlDocument, "text/HTML", "UTF-8", null);



    // Keep a reference to WebView object until you pass the
PrintDocumentAdapter

    // to the PrintManager

    testWebView = webView;

}





private void createTestWebPrintJob(WebView webView) {

    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)

    {



        PrintManager printManager = (PrintManager)
this.getSystemService(Context.PRINT_SERVICE);



        PrintDocumentAdapter printAdapter
= webView.createPrintDocumentAdapter();



        String jobName =
getString(R.string.app_name) + " Print Test";



        printManager.print(jobName, printAdapter,new PrintAttributes.Builder().build());

    }

}







you can load a webpage for printing by replacing the
method loadUrl().



 webView.loadUrl("https://developer.android.com/distribute/index.html");














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Example - How to check Bluetooth Off Or On




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




private boolean getBlueToothOn(Context context) {
    BluetoothAdapter btAdapter = ((Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN_MR1)
            ? ((BluetoothManager) context.getSystemService(Context.BLUETOOTH_SERVICE)).getAdapter()
            : (BluetoothAdapter.getDefaultAdapter()));

    if (btAdapter == null) {
        return false;
    }
    if (btAdapter.getState() == BluetoothAdapter.STATE_ON) {
        return true;
    }
}








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Example :-How to set Button background Tint 







1.In AppCompact library,
we can set button background tint .







<Button

    android:id="@+id/btn_done"

    android:layout_width="match_parent"

    android:layout_height="70dp"

    android:layout_below="@+id/seq_layout_attr"

    android:layout_margin="30dp"

    android:backgroundTint="@color/colorPrimary"

    android:text="@string/summit"

    android:textSize="@dimen/textSize"

    android:textColor="@color/white"

    android:textStyle="bold" />











2. Drawable background for a view based on a color (int)
value. I succeeded by using the code:







ColorStateList
csl = new ColorStateList(new int[][]{{}}, new
int[]{colors});

btn_done.setBackgroundTintList(csl);







3. create a Color State List Resource.







xml version="1.0" encoding="utf-8"?>

<selector xmlns:android="http://schemas.android.com/apk/res/android"
>

    <item

        android:color="#your_color_here" />

</selector>











  btn_done .setBackgroundTintList(this.getResources()



                                                            
.getColorStateList(R.color.your_xml_name));


























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