Fix abnormal exit after create engine failed

mace/examples/android/app/src/main/java/com/xiaomi/mace/demo/AppModel.java

@@ -28,6 +28,7 @@ import org.greenrobot.eventbus.EventBus;
 
 public class AppModel {
 
+    private boolean stopClassify = false;
     private Handler mJniThread;
     public static AppModel instance = new AppModel();
     private AppModel() {
@@ -54,8 +55,18 @@ public class AppModel {
             @Override
             public void run() {
                 int result = JniMaceUtils.maceMobilenetCreateEngine(initData.getModel(), initData.getDevice());
-                if (result == -1 && callback != null) {
-                    callback.onCreateEngineFail();
+                Log.i("APPModel", "maceMobilenetCreateEngine result = " + result);
+
+                if (result == -1) {
+                    stopClassify = true;
+                    MaceApp.app.mMainHandler.post(new Runnable() {
+                        @Override
+                        public void run() {
+                            callback.onCreateEngineFail(InitData.DEVICES[0].equals(initData.getDevice()));
+                        }
+                    });
+                } else {
+                    stopClassify = false;
                 }
             }
         });
@@ -65,6 +76,9 @@ public class AppModel {
         mJniThread.post(new Runnable() {
             @Override
             public void run() {
+                if (stopClassify) {
+                    return;
+                }
                 long start = System.currentTimeMillis();
                 float[] result = JniMaceUtils.maceMobilenetClassify(input);
 
@@ -76,7 +90,7 @@ public class AppModel {
     }
 
     public interface CreateEngineCallback {
-        void onCreateEngineFail();
+        void onCreateEngineFail(final boolean quit);
     }
 
 }

mace/examples/android/app/src/main/java/com/xiaomi/mace/demo/CameraActivity.java

@@ -25,7 +25,6 @@ import android.view.WindowManager;
 import android.widget.Button;
 import android.widget.ImageView;
 import android.widget.TextView;
-import android.widget.Toast;
 
 
 import com.xiaomi.mace.demo.camera.CameraEngage;
@@ -187,17 +186,29 @@ public class CameraActivity extends Activity implements View.OnClickListener, Ap
     }
 
     @Override
-    public void onCreateEngineFail() {
+    public void onCreateEngineFail(final boolean quit) {
         AlertDialog.Builder builder = new AlertDialog.Builder(this);
         builder.setTitle("Error");
-        builder.setMessage("Failed to create inference engine with current setting!");
+        builder.setMessage("Failed to create inference engine with current setting:\n" + initData.getModel() + ", " + initData.getDevice());
         builder.setCancelable(false);
-        builder.setPositiveButton("Quit", new DialogInterface.OnClickListener() {
+        builder.setPositiveButton(quit ? "Quit" : "Reset", new DialogInterface.OnClickListener() {
             @Override
             public void onClick(DialogInterface dialog, int which) {
-                finish();
+                if (quit) {
+                    System.exit(0);
+                } else {
+                    dialog.dismiss();
+                    resetCpu();
+                }
             }
         });
         builder.show();
     }
+
+    private void resetCpu() {
+        String content = InitData.DEVICES[0];
+        mSelectPhoneType.setText(content);
+        initData.setDevice(content);
+        AppModel.instance.maceMobilenetCreateEngine(initData, CameraActivity.this);
+    }
 }