TermApp/app/src/main/java/com/xinyingpower/microphoto/MainActivity.java

package com.xinyingpower.microphoto;

import android.content.Intent;
import android.os.Build;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import com.dowse.camera.client.DSCameraManager;
import com.xinyingpower.microphoto.databinding.ActivityMainBinding;

import java.io.File;

public class MainActivity extends AppCompatActivity {

    // Used to load the 'microphoto' library on application startup.
    static {
        System.loadLibrary("microphoto");
    }

    private ActivityMainBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        binding = ActivityMainBinding.inflate(getLayoutInflater());
        setContentView(binding.getRoot());

        Intent intent = new Intent(getApplicationContext(), MicroPhotoService.class);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            startForegroundService(intent);
        } else {
            startService(intent);
        }

        // Example of a call to a native method
        TextView tv = binding.sampleText;
        tv.setText(stringFromJNI());

        this.binding.button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                File path = Environment.getExternalStorageDirectory();
                File file = new File(path, "photo.jpg");
                boolean res = false;

                res = DSCameraManager.getInstace().init();

                res = DSCameraManager.getInstace().takePhoto(file.getAbsolutePath(), 1);

                if (!res)
                {
                    int aa = 0;
                }

                res = DSCameraManager.getInstace().unInit();

            }
        });

    }

    /**
     * A native method that is implemented by the 'microphoto' native library,
     * which is packaged with this application.
     */
    public native String stringFromJNI();
}