build.gradle
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// Volley library implementation 'com.loopj.android:android-async-http:1.4.9' |
And also we need to add the internet permission to get data from the api
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<!--Allow Internet Permission--> <uses-permission android:name="android.permission.INTERNET" /> |
Change the style to NoActionBar in the themes.xml file:
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<style name=”AppTheme” parent=”Theme.AppCompat.NoActionBar”> |
strings.xml
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<resources> <string name="app_name">Am I Rich?</string> <string name="label_default_text">304.74</string> <string name="label_error_text">Error</string> <string name="base">Base Currency</string> <string name="imageview_desc">Bitcoin Logo</string> <string-array name="currency_array"> <item>AUD</item> <item>BRL</item> <item>CAD</item> <item>CNY</item> <item>EUR</item> <item>GBP</item> <item>HKD</item> <item>JPY</item> <item>PLN</item> <item>RUB</item> <item>SEK</item> <item>USD</item> <item>ZAR</item> </string-array> </resources> |
XML Code
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<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/bkgndColour" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingBottom="@dimen/activity_vertical_margin" tools:context="com.example.bitcointracker.MainActivity"> <TextView android:id="@+id/priceLabel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:text="@string/label_default_text" android:textColor="@color/fontColour" android:textSize="45sp" android:textStyle="bold" /> <ImageView android:id="@+id/logoImage" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_centerHorizontal="true" android:contentDescription="@string/imageview_desc" android:src="@drawable/bitcoin_image" /> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_below="@+id/priceLabel" android:gravity="center_vertical|center_horizontal" android:orientation="horizontal"> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:layout_marginLeft="10dp" android:layout_marginRight="10dp" android:text="@string/base" android:textAppearance="?android:attr/textAppearanceLarge" android:textSize="30sp" android:textStyle="bold" /> <Spinner android:id="@+id/currency_spinner" android:layout_width="wrap_content" android:layout_height="wrap_content" android:dropDownSelector="@color/fontColour" android:gravity="center_horizontal" android:spinnerMode="dropdown" /> </LinearLayout> </RelativeLayout> |
app> res > layout > spinner_dropdown_item.xml.
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<?xml version="1.0" encoding="utf-8"?> <CheckedTextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@android:id/text1" style="?android:attr/spinnerDropDownItemStyle" android:layout_width="match_parent" android:layout_height="?android:attr/listPreferredItemHeight" android:background="@drawable/color_selector" android:ellipsize="marquee" android:paddingLeft="10dp" android:paddingRight="10dp" android:singleLine="true" android:text="@string/label_error_text" android:textColor="@color/black" android:textSize="30sp" /> |
spinner_item.xml file:
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<?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="start" android:padding="10dip" android:text="@string/label_error_text" android:textColor="@color/black" android:textSize="30sp" android:textStyle="bold" /> |
Java Code
MainActivity.java
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import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemSelectedListener; import android.widget.ArrayAdapter; import android.widget.Spinner; import android.widget.TextView; import androidx.appcompat.app.AppCompatActivity; import com.loopj.android.http.AsyncHttpClient; import com.loopj.android.http.JsonHttpResponseHandler; import org.json.JSONException; import org.json.JSONObject; import java.io.IOException; import cz.msebera.android.httpclient.Header; public class MainActivity extends AppCompatActivity { // Constants: // TODO: Create the base URL private final String BASE_URL = "http://api.coinlayer.com/live?access_key="; // Member Variables: TextView mPriceTextView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mPriceTextView = (TextView) findViewById(R.id.priceLabel); Spinner spinner = (Spinner) findViewById(R.id.currency_spinner); // Create an ArrayAdapter using the String array and a spinner layout final ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.currency_array, R.layout.spinner_item); // Specify the layout to use when the list of choices appears adapter.setDropDownViewResource(R.layout.spinner_dropdown_item); // Apply the adapter to the spinner spinner.setAdapter(adapter); // TODO: Set an OnItemSelected listener on the spinner spinner.setOnItemSelectedListener(new OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { String publicKey = "cd9ebbd0c5c20340b9d638e409f41fb1"; String finalUrl = BASE_URL + publicKey + "&TARGET=" + adapterView.getItemAtPosition(i) + "&symbols=BTC"; Log.d("Clima", "Request fail! Status code: " + finalUrl); try { letsDoSomeNetworking(finalUrl); } catch (IOException e) { e.printStackTrace(); } catch (JSONException e) { e.printStackTrace(); } } @Override public void onNothingSelected(AdapterView<?> adapterView) { } }); } // TODO: complete the letsDoSomeNetworking() method private void letsDoSomeNetworking(String url) throws IOException, JSONException { AsyncHttpClient client = new AsyncHttpClient(); client.get(url, new JsonHttpResponseHandler() { @Override public void onSuccess(int statusCode, Header[] headers, JSONObject response) { // called when response HTTP status is "200 OK" Log.d("Clima", "JSON: " + response.toString()); try { JSONObject price = response.getJSONObject("rates"); String object = price.getString("BTC"); mPriceTextView.setText(object); } catch (JSONException E) { E.printStackTrace(); } } @Override public void onFailure(int statusCode, Header[] headers, Throwable e, JSONObject response) { // called when response HTTP status is "4XX" (eg. 401, 403, 404) Log.d("Clima", "Request fail! Status code: " + statusCode); Log.d("Clima", "Fail response: " + response); Log.e("ERROR", e.toString()); } }); } } |
