On clicking predict button, the app crashes

Question

Recently I have been working on android studio, I built a python image classification model and want to integrate it with an app. But when I click on predict button, the app crashes. Would be helpful if I can get the idea as to where things are going wrong. Attached is the code and the error it throws - Activitymain.java :-

    package com.example.uni;




import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import com.example.uni.ml.ConvertedModel;

import org.tensorflow.lite.DataType;
import org.tensorflow.lite.support.image.TensorImage;
import org.tensorflow.lite.support.tensorbuffer.TensorBuffer;

import java.io.IOException;
import java.nio.ByteBuffer;

public class MainActivity extends AppCompatActivity {
    private ImageView imgView;
    private Button predict;
    private Button select;
    private TextView tv;
    private Bitmap img;



    @Override
    protected  void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imgView = (ImageView) findViewById(R.id.imageView);
        tv = (TextView) findViewById(R.id.textView);
        select = (Button) findViewById(R.id.button);
        predict = (Button) findViewById(R.id.button2);

        select.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
                intent.setType("image/*");
                startActivityForResult(intent,12);

            }
        });

        predict.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                img = Bitmap.createScaledBitmap(img,
                        500,
                        500,
                        true);

                try {
                    ConvertedModel model = ConvertedModel.newInstance(getApplicationContext());

                    // Creates inputs for reference.
                    TensorBuffer inputFeature0 = TensorBuffer.createFixedSize(new int[]{1, 500, 500, 3}, DataType.FLOAT32);

                    TensorImage tensorImage = new TensorImage(DataType.FLOAT32);
                    tensorImage.load(img);
                    ByteBuffer byteBuffer = tensorImage.getBuffer();


                    inputFeature0.loadBuffer(byteBuffer);

                    // Runs model inference and gets result.
                    ConvertedModel.Outputs outputs = model.process(inputFeature0);
                    TensorBuffer outputFeature0 = outputs.getOutputFeature0AsTensorBuffer();

                    // Releases model resources if no longer used.
                    model.close();


                    tv.setText((int) outputFeature0.getFloatArray()[0]);


                } catch (IOException e) {
                    /* TODO Handle the exception */
                }

            }
        });





    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if(requestCode == 100)
        {
            imgView.setImageURI(data.getData());

            Uri uri = data.getData();
            try {
                img = MediaStore.Images.Media.getBitmap(this.getContentResolver(),uri);
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    }
}

In logcat I see this -

    2021-11-05 13:23:38.040 24027-24027/com.example.uni I/tflite: Initialized TensorFlow Lite runtime.
2021-11-05 13:23:38.090 24027-24027/com.example.uni E/libc: Access denied finding property "ro.hardware.chipname"
2021-11-05 13:23:38.081 24027-24027/com.example.uni W/com.example.uni: type=1400 audit(0.0:232245): avc: denied { read } for name="u:object_r:vendor_default_prop:s0" dev="tmpfs" ino=14249 scontext=u:r:untrusted_app:s0:c48,c257,c512,c768 tcontext=u:object_r:vendor_default_prop:s0 tclass=file permissive=0
2021-11-05 13:23:38.841 24027-24027/com.example.uni E/com.example.un: Invalid ID 0x00000000.
2021-11-05 13:23:38.842 24027-24027/com.example.uni D/AndroidRuntime: Shutting down VM
2021-11-05 13:23:38.843 24027-24027/com.example.uni E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.example.uni, PID: 24027
    android.content.res.Resources$NotFoundException: String resource ID #0x0
        at android.content.res.Resources.getText(Resources.java:381)
        at android.content.res.MiuiResources.getText(MiuiResources.java:97)
        at android.widget.TextView.setText(TextView.java:6397)
        at com.example.uni.MainActivity$2.onClick(MainActivity.java:85)
        at android.view.View.performClick(View.java:7189)
        at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1119)
        at android.view.View.performClickInternal(View.java:7166)
        at android.view.View.access$3500(View.java:819)
        at android.view.View$PerformClick.run(View.java:27682)
        at android.os.Handler.handleCallback(Handler.java:883)
        at android.os.Handler.dispatchMessage(Handler.java:100)
        at android.os.Looper.loop(Looper.java:224)
        at android.app.ActivityThread.main(ActivityThread.java:7592)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:539)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:950)
2021-11-05 13:23:38.887 24027-24027/com.example.uni I/Process: Sending signal. PID: 24027 SIG: 9

Need suggestions as to what's going on and how to resolve it. I'm using android studio arctic fox 2020.3.1 patch 3.

Answer 1

The logcat already told you that it crashed at the setText() call. You called

tv.setText((int) outputFeature0.getFloatArray()[0]);

The int in setText(int) refers to a Resource ID defined in the string.xml ( R.string.xxx ).

If you are not getting the string from res, you should use setText(CharSequence) instead.

You probably want

tv.setText(String.format("%f",outputFeature0.getFloatArray()[0]));

(change "%f" to any decimal points or format you want)