optimized shortcut pinning and support for android < 7

app/src/main/java/de/joel/zoomhelper/MainActivity.java

@@ -4,25 +4,17 @@ import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
-import android.content.pm.ShortcutInfo;
-import android.content.pm.ShortcutManager;
-import android.graphics.drawable.Icon;
 import android.net.Uri;
-import android.os.Build;
 import android.os.Bundle;
-import android.os.PersistableBundle;
 import android.util.AttributeSet;
 import android.util.Base64;
 import android.view.View;
-import android.widget.ArrayAdapter;
 import android.widget.AutoCompleteTextView;
 import android.widget.EditText;
 import android.widget.ImageView;
 import android.widget.ScrollView;
-import android.widget.TextView;
 import android.widget.Toast;
 
-import androidx.annotation.RequiresApi;
 import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.core.content.pm.ShortcutInfoCompat;
@@ -124,7 +116,6 @@ public class MainActivity extends AppCompatActivity {
         ShortcutIcon.setOnClickListener(v -> createMeetingShortcut(searchMeetingInList(getMeetings(), createCurrMeetingFromUI().meetingName)));
     }
 
-    @RequiresApi(api = Build.VERSION_CODES.N_MR1)
     private void createMeetingShortcut(int meetingIndex) {
 
         Meeting meeting = getMeetings().get(meetingIndex);
@@ -143,7 +134,7 @@ public class MainActivity extends AppCompatActivity {
                     .build();
             ShortcutManagerCompat.requestPinShortcut(this, shortcutInfo, null);
         } else {
-            Toast.makeText(this, "no shortcut", Toast.LENGTH_SHORT).show();
+            Toast.makeText(this, R.string.ShortcutError, Toast.LENGTH_SHORT).show();
         }
     }
 
@@ -276,7 +267,7 @@ public class MainActivity extends AppCompatActivity {
         adapter.setData(Arrays.asList(meetingNames));
         textMeetingName.setAdapter(adapter);
 
-        textMeetingName.setOnTouchListener((View.OnTouchListener) (paramView, paramMotionEvent) -> false);
+        textMeetingName.setOnTouchListener((paramView, paramMotionEvent) -> false);
 
         textMeetingName.setOnItemClickListener((arg0, view, arg2, arg3) -> fillWithSelectedMeeting());
 
@@ -302,7 +293,7 @@ public class MainActivity extends AppCompatActivity {
         adapter.setData(Arrays.asList(attNames));
         textName.setAdapter(adapter);
 
-        textName.setOnTouchListener((View.OnTouchListener) (paramView, paramMotionEvent) -> false);
+        textName.setOnTouchListener((paramView, paramMotionEvent) -> false);
 
         textName.setOnItemClickListener((arg0, view, arg2, arg3) -> fillWithSelectedAtt(meetingIndex));