Android Tutorial: June 2016

XML File

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

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

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical">

    <WebView

        android:id="@+id/webView"

        android:layout_width="match_parent"

        android:layout_height="match_parent" />

</LinearLayout>


Activity Class

public class HtmlWebViewActivity extends AppCompatActivity{

    private WebView webView;

    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.webview);

        webView = (WebView) findViewById(R.id.webView);

        showHtmlWebView();
    }

    private void showHtmlWebView() {
        final String mimeType = "text/html";
        final String encoding = "UTF-8";
        String htmlString = "<html>\n" +
                "<body>\n" +
                "<center>\n" +
                "<img src='http://www.homeworknow.com/hwnow/upload/images/tn_star300.gif' />\n" +
                "<p>Hello World </p>\n" +
                "<font color='#60c000' size='4'><strong>Android Developer</strong></font>\n" +
                "<p>Android powers hundreds of millions of mobile devices in more than 190 countries around the world. It's the largest installed base of any mobile platform and growing fast—every day another million users power up their Android devices for the first time and start looking for apps, games, and other digital content.</p>\n"+
                "<p>Android gives you everything you need to build best-in-class app experiences. It gives you a single application model that lets you deploy your apps broadly to hundreds of millions of users across a wide range of devices—from phones to tablets and beyond.</p>\n"+
                "</center>\n" +
                "</body>\n" +
                "</html>\t\t ";

        webView.loadData(htmlString, mimeType, encoding);
    }
}

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XML File

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

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

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    android:weightSum="1">

    <RelativeLayout

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:layout_weight=".5"

        android:orientation="vertical">

        <TextView

          android:layout_width="match_parent"

          android:layout_height="wrap_content"

          android:gravity="center"

          android:text="@string/Encode"

          android:textColor="@android:color/holo_blue_dark"

          android:textSize="@dimen/twenty" />

        <EditText

          android:id="@+id/editEncode"

          android:layout_width="match_parent"

          android:layout_height="wrap_content"

          android:layout_above="@+id/txtEncoded"

          android:layout_alignParentLeft="true"

          android:layout_alignParentStart="true"

          android:gravity="center"

          android:hint="@string/EnterText" />

        <TextView

          android:id="@+id/txtEncoded"

          android:layout_width="wrap_content"

          android:layout_height="wrap_content"

          android:layout_centerHorizontal="true"

          android:layout_centerVertical="true"

          android:layout_marginTop="@dimen/twenty"

          android:textIsSelectable="true"

          android:text="Encode Text" />

        <Button

          android:id="@+id/btEncode"

          android:layout_width="wrap_content"

          android:layout_height="wrap_content"

          android:layout_alignParentBottom="true"

          android:layout_centerHorizontal="true"

          android:text="@string/Encode" />

    </RelativeLayout>

    <RelativeLayout

       android:layout_width="match_parent"

       android:layout_height="match_parent"

       android:layout_weight=".5">

        <LinearLayout

           android:layout_width="match_parent"

           android:layout_height="5dp"

           android:background="@android:color/black"></LinearLayout>

        <TextView

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:gravity="center"

            android:text="@string/Decode"

            android:textColor="@android:color/holo_blue_dark"

            android:textSize="@dimen/twenty" />

        <EditText

            android:id="@+id/editDecode"

            android:layout_width="match_parent"

            android:layout_height="wrap_content"

            android:layout_above="@+id/txtDecoded"

            android:layout_alignParentLeft="true"

            android:layout_alignParentStart="true"

            android:gravity="center"

            android:hint="@string/EnterText" />

        <TextView

            android:id="@+id/txtDecoded"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_centerHorizontal="true"

            android:layout_centerVertical="true"

            android:layout_marginTop="@dimen/twenty"

            android:text="Decode Text"

            android:textIsSelectable="true" />

        <Button

            android:id="@+id/btDecode"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_alignParentBottom="true"

            android:layout_centerHorizontal="true"

            android:text="@string/Decode" />
    </RelativeLayout>

</LinearLayout>

Activity Class

public class EncodeDecodeActivity extends AppCompatActivity implements View.OnClickListener {

    private final String TAG = EncodeDecodeActivity.class.getSimpleName();
    @Override    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.encode);

        initializeValues();
    }

    private void initializeValues() {

        Button btEncode = (Button) findViewById(R.id.btEncode);
        Button btDecode = (Button) findViewById(R.id.btDecode);

        btEncode.setOnClickListener(this);
        btDecode.setOnClickListener(this);
    }

    @Override    public void onClick(View v) {
        switch (v.getId()){
            case R.id.btEncode:
                encodeData();
                break;

            case R.id.btDecode:
                decodeData();
                break;
        }
    }

    private void encodeData() {
        EditText editEncode = (EditText) findViewById(R.id.editEncode);
        TextView txtEncode = (TextView) findViewById(R.id.txtEncoded);
        String encode = editEncode.getText().toString().trim();
        if (!encode.isEmpty()){
            try {
                byte[] encodeByte = encode.getBytes("UTF-8");
                String strEncode = Base64.encodeToString(encodeByte, Base64.DEFAULT);
                txtEncode.setText(strEncode);
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }

        }else {
            Toast.makeText(this, "Enter your text to encode", Toast.LENGTH_SHORT).show();
        }
    }

    private void decodeData() {
        EditText editDecode = (EditText) findViewById(R.id.editDecode);
        TextView txtDecode = (TextView) findViewById(R.id.txtDecoded);

        String decode = editDecode.getText().toString().trim();
        if (!decode.isEmpty()){
            try {

                byte[] decodeByte = Base64.decode(decode, Base64.DEFAULT);
                String strDecode = new String(decodeByte, "UTF-8");
                txtDecode.setText(strDecode);
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }

        }else {
            Toast.makeText(this, "Enter your text to decode", Toast.LENGTH_SHORT).show();
        }
    }
}





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