how to capture the touch horizontally and vertically?

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how to capture the touch horizontally and vertically?

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#1 by (1 votes)

1

hello programmers friends as they are I hope very well I have a problem when trying to capture the vertical and horizontal movement of the screen of my android I have the following code

@Override
public boolean onTouchEvent(MotionEvent event) {
    // TODO Auto-generated method stub

    cory = (int) event.getY();
    corx = (int) event.getY();
    posInicial = corx;
    if(posInicial<cory){
        tvUsurio.setText(volumen+1);
        return true;
    }else if (posInicial>cory){
        tvUsurio.setText("Bajo volumne");
        return true;
    }
   return true;
}

The problem is that it does not show me anything when I touch the screen it does not show me anything could help me with this also I do not know if it's okay or that

android android-layout android-studio

asked by Jhonny Luis 19.09.2016 в 08:19

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1 answer

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score 1 · Answer 1

Assuming that if you make an upward movement you raise the volume and if you make a downward movement you lower the volume. Based on the above, we would work with the coordinates of the Y axis.

It is important to remember that in Android the coordinates are indicated in this way, in the upper left corner we have X = 0, Y = 0 and it is going to increase Y downwards and X to the right:

To do what you want, you must first obtain the value of Y and compare it with posInicial , after the comparison you store the value of y in the variable posInicial .

With this you can do what you want, remember that the listener to use the onTouch () method is OnTouchListener () .

I add an example, assuming having a LinearLayout as a background in our main layout activity_main.xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:id="@+id/my_layout">   
</LinearLayout>

Within our Activity that loads the layout we obtain the reference and assign the listener:

  LinearLayout my_layout = (LinearLayout)findViewById(R.id.my_layout);
        my_layout.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent event) {
                float x = event.getX();
                float y = event.getY();
                if(posInicial > y){
                    Log.i("Volumen", "Sube volumen!");
                    //tvUsurio.setText(volumen+1);
                }else if (posInicial < y){
                    Log.i("Volumen", "Baja volumen!");
                    //tvUsurio.setText("Bajo volumne");
                }

                //Despues de evaluar si va hacia arriba o hacia abajo almacenamos el valor de la variable.
                posInicial = y;

                return true;
            }
        });