add back button

Author: master-hax

app/src/main/java/app/attestation/auditor/InspectAuditeeActivity.java

@@ -6,8 +6,11 @@
 import android.widget.TableRow;
 import android.widget.TextView;
 
+import androidx.appcompat.app.ActionBar;
 import androidx.appcompat.app.AppCompatActivity;
 
+import com.google.android.material.appbar.MaterialToolbar;
+
 import java.util.Date;
 
 public class InspectAuditeeActivity extends AppCompatActivity {
@@ -31,6 +34,18 @@ protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_inspectauditee);
 
+        // set up back button
+        final MaterialToolbar toolbar = findViewById(R.id.inspect_auditee_toolbar);
+        setSupportActionBar(toolbar);
+        final ActionBar supportActionBar = getSupportActionBar();
+        if (supportActionBar != null) {
+            supportActionBar.setDisplayHomeAsUpEnabled(true);
+        }
+        toolbar.setNavigationOnClickListener(v -> {
+            finish();
+        });
+
+        // load auditee information
         final String fingerprint_hex = getIntent().getStringExtra(INTENT_KEY_FINGERPRINT);
         if (fingerprint_hex == null || fingerprint_hex.isBlank()) {
             Log.e(TAG, "auditee fingerprint not provided");

app/src/main/res/layout/activity_inspectauditee.xml

@@ -11,7 +11,7 @@
         android:fitsSystemWindows="true">
 
         <com.google.android.material.appbar.MaterialToolbar
-            android:id="@+id/toolbar"
+            android:id="@+id/inspect_auditee_toolbar"
             android:layout_width="match_parent"
             android:layout_height="?attr/actionBarSize" />