Android Open Source - FlashTransmitter Transmit Activity

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From Project

Back to project page FlashTransmitter.

License

The source code is released under:

GNU General Public License

Java Source Code

package com.catinthedark.activity;
//  w  ww. j  a  v a 2  s  .  com
import android.app.Activity;
import android.graphics.SurfaceTexture;
import android.hardware.Camera;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import com.catinthedark.R;
import com.catinthedark.flash_transmitter.lib.algorithm.*;
import com.catinthedark.flash_transmitter.lib.factories.EncodingSchemeFactory;
import com.catinthedark.flash_transmitter.lib.factories.ErrorCorrectionFactory;
import com.catinthedark.flash_transmitter.lib.factories.LineCoderFactory;
import com.catinthedark.flash_transmitter.lib.factories.LogicalCodeFactory;

import java.io.IOException;
import java.util.Arrays;

import static java.lang.Thread.sleep;

public class TransmitActivity extends Activity{

    public final String TAG = "FlashTransmitter";
    private TextView transmitRawTextView;
    private Boolean shouldTransmissionStop = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Bundle extras = getIntent().getExtras();
        String encodingSchemeName = EncodingSchemeFactory.defaultScheme;
        String lineCoderName = LineCoderFactory.defaultCoder;
        String errorCorrectionName = ErrorCorrectionFactory.defaultErrorCorrection;
        String logicalCodeName = LogicalCodeFactory.defaultLogicalCode;
        if (extras != null) {
            encodingSchemeName = extras.getString("encoding_scheme_name");
            lineCoderName = extras.getString("line_coder_name");
            logicalCodeName = extras.getString("logical_code_name");
            errorCorrectionName = extras.getString("error_correction_name");
        }

        final EncodingScheme scheme = EncodingSchemeFactory.build(encodingSchemeName);
        final LineCoder coder = LineCoderFactory.build(lineCoderName);
        final ErrorCorrectionLayer correction = ErrorCorrectionFactory.build(errorCorrectionName);
        final LogicalCodeLayer logical = LogicalCodeFactory.build(logicalCodeName);
        final Converter converter = new Converter(scheme, coder, correction, logical);

        Button transmitButton = (Button) findViewById(R.id.transmitButton);
        transmitButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                EditText transmitEditText = (EditText) findViewById(R.id.transmitText);
                EditText frequencyEditText = (EditText) findViewById(R.id.frequencyText);
                transmitRawTextView = (TextView) findViewById(R.id.transmitRawTextView);

                String transmitString = transmitEditText.getText().toString();

                final Byte[] transmitBits = converter.makeBits(transmitString);

                final String transmitValue = Arrays.toString(transmitBits).replaceAll("[\\]\\[\\, ]", "");

                Log.e(TAG, transmitValue);
                final int frequency = Integer.valueOf(frequencyEditText.getText().toString());

                transmitRawTextView.setText(transmitValue + " will be transmitted.");

                new Thread() {
                    public void run() {
                        transmitData(transmitBits, frequency);
                    }
                }.start();
            }
        });
    }

    private void transmitData(Byte[] data, int frequency) {
        Camera camera;
        try {
            camera = Camera.open();
        } catch (RuntimeException e) {
            Log.w(TAG, "Skip transmitting: " + e.getMessage());
            return;
        }

        int millisInSecond = 1000;
        int period = millisInSecond / (frequency);
        Camera.Parameters parameters = camera.getParameters();
        SurfaceTexture st = new SurfaceTexture(0);

        try {
            camera.setPreviewTexture(st);
        } catch (IOException e) {
            e.printStackTrace();
        }

        for(byte bit: data) {
            synchronized (shouldTransmissionStop) {
                if (shouldTransmissionStop) {
                    break;
                }
            }

            try {
                if (bit == 1) {
                    parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
                    camera.setParameters(parameters);
                    camera.startPreview();
                    sleep(period);
                } else {
                    parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
                    camera.setParameters(parameters);
                    camera.stopPreview();
                    sleep(period);
                }
            } catch (InterruptedException e) {
                Log.w(TAG, "InterruptedException");
            }
        }
        parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
        camera.setParameters(parameters);
        camera.stopPreview();
        camera.release();
    }

    @Override
    public void onResume() {
        super.onResume();
        synchronized (shouldTransmissionStop) {
            shouldTransmissionStop = false;
        }
    }

    @Override
    public void onPause() {
        super.onPause();
        synchronized (shouldTransmissionStop) {
            shouldTransmissionStop = true;
        }
    }
}

Java Source Code List

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