使用onTouchlistener android闪烁手电筒

Question

我想在ontouchlistener的帮助下使手电筒闪烁，任何教程指南都将受到高度赞赏。等待帮助。

我现在尝试的代码如下所示，代码只需按一下按钮即可打开和关闭手电筒。

public class MainActivity extends Activity {

    ImageButton btnSwitch;

    private Camera camera;
    private boolean isFlashOn;
    private boolean hasFlash;
    Parameters params;
    MediaPlayer mp;


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

        Button btn  = (Button)findViewById(R.id.button1);
        btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                Intent myintent = new Intent(getApplicationContext(),
                        MainScreen.class);
                startActivity(myintent);

            }
        });



        // flash switch button
                btnSwitch = (ImageButton) findViewById(R.id.btnSwitch);

                // First check if device is supporting flashlight or not
                hasFlash = getApplicationContext().getPackageManager()
                        .hasSystemFeature(PackageManager.FEATURE_CAMERA_FLASH);

                if (!hasFlash) {
                    // device doesn't support flash
                    // Show alert message and close the application
                    AlertDialog alert = new AlertDialog.Builder(MainActivity.this)
                            .create();
                    alert.setTitle("Error");
                    alert.setMessage("Sorry, your device doesn't support flash light!");
                    alert.setButton("OK", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            // closing the application
                            finish();
                        }
                    });
                    alert.show();
                    return;
                }

                // get the camera
                getCamera();

                // displaying button image
                toggleButtonImage();

                // Switch button click event to toggle flash on/off
                btnSwitch.setOnClickListener(new View.OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        if (isFlashOn) {
                            // turn off flash
                            turnOffFlash();
                        } else {
                            // turn on flash
                            turnOnFlash();
                        }
                    }
                });
    }




    }



    // Get the camera
    private void getCamera() {
        if (camera == null) {
            try {
                camera = Camera.open();
                params = camera.getParameters();
            } catch (RuntimeException e) {
                Log.e("Camera Error. Failed to Open. Error: ", e.getMessage());
            }
        }
    }

    // Turning On flash
    private void turnOnFlash() {
        if (!isFlashOn) {
            if (camera == null || params == null) {
                return;
            }
            // play sound
            playSound();

            params = camera.getParameters();
            params.setFlashMode(Parameters.FLASH_MODE_TORCH);
            camera.setParameters(params);
            camera.startPreview();
            isFlashOn = true;

            // changing button/switch image
            toggleButtonImage();
        }

    }

    // Turning Off flash
    private void turnOffFlash() {
        if (isFlashOn) {
            if (camera == null || params == null) {
                return;
            }
            // play sound
            playSound();

            params = camera.getParameters();
            params.setFlashMode(Parameters.FLASH_MODE_OFF);
            camera.setParameters(params);
            camera.stopPreview();
            isFlashOn = false;

            // changing button/switch image
            toggleButtonImage();
        }
    }

    // Playing sound
    // will play button toggle sound on flash on / off
    private void playSound() {
        if (isFlashOn) {
            mp = MediaPlayer.create(MainActivity.this, R.raw.light_switch_off);
        } else {
            mp = MediaPlayer.create(MainActivity.this, R.raw.light_switch_on);
        }
        mp.setOnCompletionListener(new OnCompletionListener() {

            @Override
            public void onCompletion(MediaPlayer mp) {
                // TODO Auto-generated method stub
                mp.release();
            }
        });
        mp.start();
    }

    /*
     * Toggle switch button images changing image states to on / off
     */
    private void toggleButtonImage() {
        if (isFlashOn) {
            btnSwitch.setImageResource(R.drawable.torch_on);
        } else {
            btnSwitch.setImageResource(R.drawable.torch_btn);
        }
    }



    @Override
    protected void onPause() {
        super.onPause();

        // on pause turn off the flash
        turnOffFlash();
    }



    @Override
    protected void onResume() {
        super.onResume();

        // on resume turn on the flash
        if (hasFlash)
            turnOnFlash();
    }

    @Override
    protected void onStart() {
        super.onStart();


        getCamera();
    }

    @Override

    @Override
    protected void onStop() {
        super.onStop();

        // on stop release the camera
        if (camera != null) {
            camera.release();
            camera = null;
        }
    }

}

现在我想要的是让这个闪光灯闪烁以及另一个按钮。