TermApp/app/src/main/java/com/xypower/mpapp/ChannelActivity.java

package com.xypower.mpapp;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import androidx.appcompat.app.ActionBar;

import com.xypower.mpapp.databinding.ActivityChannelBinding;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import android.widget.AdapterView;

public class ChannelActivity extends AppCompatActivity {

    private ActivityChannelBinding binding;

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

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

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);


        binding.sensitivity.setOnFocusChangeListener(onFocusChangeListener);
        binding.exposuretime.setOnFocusChangeListener(onFocusChangeListener);

        int channel = binding.channels.getSelectedItemPosition();
        loadChannelParams(channel);

        binding.channels.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                int channel = i + 1;
                loadChannelParams(channel);
            }

            @Override
            public void onNothingSelected(AdapterView<?> adapterView) {

            }
        });

        binding.btnSave.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int channel = binding.channels.getSelectedItemPosition() + 1;
                saveChannelParams(channel);
            }
        });
    }


    private View.OnFocusChangeListener onFocusChangeListener = new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean b) {
            InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
        }
    };

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                // todo: goto back activity from here

                finish();
                return true;

            default:
                return super.onOptionsItemSelected(item);
        }
    }

    protected void loadChannelParams(int channel) {

        binding.btnAutoExplosure.setChecked(true);
        binding.btnAutoFocus.setChecked(true);
        binding.btnHdrMode.setChecked(true);
        binding.exposuretime.setText("0");
        binding.sensitivity.setText("0");

        String appPath = MicroPhotoService.buildAppDir(getApplicationContext());

        InputStreamReader inputStreamReader = null;
        BufferedReader bufferedReader = null;
        try {
            inputStreamReader = new InputStreamReader(new FileInputStream(new File(appPath + "data/channels/" + String.valueOf(channel) + ".json")), "UTF-8");
            bufferedReader = new BufferedReader(inputStreamReader);
            String line;
            StringBuilder stringBuilder = new StringBuilder();
            while ((line = bufferedReader.readLine()) != null) {
                stringBuilder.append(line);
            }

            JSONObject jsonObject = new JSONObject(stringBuilder.toString());
            binding.btnAutoExplosure.setChecked(jsonObject.optInt("autoExposure", 1) == 1);
            binding.btnAutoFocus.setChecked(jsonObject.optInt("autoFocus", 1) == 1);
            binding.btnHdrMode.setChecked(jsonObject.optInt("hdr", 1) == 1);
            binding.exposuretime.setText(Integer.toString(jsonObject.optInt("exposureTime", 0)));
            binding.sensitivity.setText(Integer.toString(jsonObject.optInt("sensibility", 0)));

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (Exception ex) {
                }
            }
            if (inputStreamReader != null) {
                try {
                    inputStreamReader.close();
                } catch (Exception ex) {
                }
            }
        }
    }

    private void saveChannelParams(int channel) {

        JSONObject jsonObject = null;
        String appPath = MicroPhotoService.buildAppDir(this.getApplicationContext());
        InputStreamReader inputStreamReader = null;
        BufferedReader bufferedReader = null;
        File dataPath = new File(appPath + "data/channels/");
        File file = new File(dataPath, String.valueOf(channel) + ".json");

        try {
            StringBuilder stringBuilder = new StringBuilder();

            if (file.exists()) {
                inputStreamReader = new InputStreamReader(new FileInputStream(file), "UTF-8");
                bufferedReader = new BufferedReader(inputStreamReader);
                String line;

                while ((line = bufferedReader.readLine()) != null) {
                    stringBuilder.append(line);
                }

                jsonObject =stringBuilder.length() > 0 ? (new JSONObject(stringBuilder.toString())) : (new JSONObject());
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (JSONException e) {
            e.printStackTrace();
        } finally {
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (Exception ex) {
                }
            }
            if (inputStreamReader != null) {
                try {
                    inputStreamReader.close();
                } catch (Exception ex) {
                }
            }
        }

        if (jsonObject == null) {
            jsonObject = new JSONObject();
        }

        try {
            jsonObject.put("autoExposure", binding.btnAutoExplosure.isChecked() ? 1 : 0);
            jsonObject.put("autoFocus", binding.btnAutoFocus.isChecked() ? 1 : 0);
            jsonObject.put("hdrMode", binding.btnHdrMode.isChecked() ? 1 : 0);
            jsonObject.put("exposureTime", Integer.parseInt(binding.exposuretime.getText().toString()));
            jsonObject.put("sensibility", Integer.parseInt(binding.sensitivity.getText().toString()));
        } catch (JSONException ex) {

        }
        OutputStreamWriter outputStreamWriter = null;
        try {
            if (!dataPath.exists()) {
                dataPath.mkdirs();
            }

            outputStreamWriter = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");
            outputStreamWriter.write(jsonObject.toString());
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (outputStreamWriter != null) {
                try {
                    outputStreamWriter.close();
                } catch (Exception ex) {
                }

            }
        }
    }
}