issue26 src and test

app/src/main/java/io/github/subhamtyagi/lastlauncher/GuidanceNewCode.java

@@ -0,0 +1,106 @@
+package io.github.subhamtyagi.lastlauncher;
+
+import android.app.Activity;
+import android.content.SharedPreferences;
+import android.util.Log;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+
+/**
+ * the added code
+ */
+
+public class GuidanceNewCode extends Activity {
+    /**
+     * button of tutorial
+     */
+
+    private Button guidanceBtn; //NOPMD - suppressed BeanMembersShouldSerialize - should be
+
+    /**
+     * textview of tutorial
+     */
+
+    private TextView guidanceView; //NOPMD - suppressed BeanMembersShouldSerialize - should be
+
+    /**
+     * the status of tutorial, decide on which guidance text to show
+     */
+
+    private int guidanceStatus; //NOPMD - suppressed BeanMembersShouldSerialize - should be
+
+    /**
+     * debug tag
+     */
+
+    private static final String GUIDANCETAG = "guidance";
+
+    /**
+     * bind guidanceBtn and guidanceView with .xml file and check the status of app
+     * If the app runs for the first time, show the guidance
+     * If not, hide the guidance
+     */
+
+    public void initialGuidance() {
+
+        // get guidance button and view by id
+        guidanceBtn = findViewById(R.id.btn_next);
+        guidanceView = findViewById(R.id.text_guidance);
+
+        // check whether the user installs the application for the first time
+        final SharedPreferences storage = getSharedPreferences("store", 0);
+        final boolean firstGetIn =
+                storage.getBoolean("firstGetIn", true); //NOPMD - suppressed LawOfDemeter -
+
+        // if true, setup guidance, else hide the guidance
+        if (firstGetIn) {
+            Log.i(GUIDANCETAG, "first time!");
+            final SharedPreferences.Editor editor = storage.edit();
+            editor.putBoolean("firstGetIn", false); //NOPMD - suppressed LawOfDemeter -
+            editor.commit(); //NOPMD - suppressed LawOfDemeter -
+        } else {
+            guidanceBtn.setVisibility(View.GONE);
+            guidanceView.setVisibility(View.GONE);
+        }
+    }
+
+    /**
+     * add a listener to guidanceBtn
+     * when the button is clicked, change the text of guidanceView
+     * (show different steps of guidance)
+     * reveal the button and textview after user finishing the guidance
+     * @param view the origin parameter of the button listener, no use in this method
+     */
+
+    public void onClickNext(final View view) {
+        Log.i(GUIDANCETAG, "get in! status: " + guidanceStatus + " " + guidanceView.getText());
+        switch (guidanceStatus) {
+            case 0:
+                guidanceView.setText(getResources(). //NOPMD - suppressed LawOfDemeter -
+                        getString(R.string.guidance2));
+                guidanceView.requestLayout();
+                guidanceStatus++;
+                Log.i(GUIDANCETAG, "First out!" + guidanceView.getText());
+                guidanceView.postInvalidate();
+                break;
+            case 1:
+                guidanceView.setText(getResources(). //NOPMD - suppressed LawOfDemeter -
+                        getString(R.string.guidance3));
+                guidanceStatus++;
+                Log.i(GUIDANCETAG, "Second out!" + guidanceView.getText());
+                break;
+            case 2:
+                guidanceView.setText(getResources(). //NOPMD - suppressed LawOfDemeter -
+                        getString(R.string.guidance4));
+                guidanceStatus++;
+                guidanceBtn.setText(getResources(). //NOPMD - suppressed LawOfDemeter -
+                        getString(R.string.finish));
+                break;
+            default:
+                guidanceBtn.setVisibility(View.GONE);
+                guidanceView.setVisibility(View.GONE);
+                break;
+        }
+    }
+}