Change textView while moving finger across buttons

问题

In my app, I have an activity in which there are 9 buttons and 1 textView. I am making use of OnTouchListener to change the text in the textView as I move my finger accross the buttons.

This is what my activity looks like:

Here is my java code:

    button1.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            textView.setText("Button 1");
            return false;
        }
    });
    button2.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            textView.setText("Button 2");
            return false;
        }
    });
    button3.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            textView.setText("Button 3");
            return false;
        }
    });
    button4.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            textView.setText("Button 4");
            return false;
        }
    });
    button5.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            textView.setText("Button 5");
            return false;
        }
    });
    button6.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            textView.setText("Button 6");
            return false;
        }
    });
    button7.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            textView.setText("Button 7");
            return false;
        }
    });
    button8.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            textView.setText("Button 8");
            return false;
        }
    });
    button9.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            textView.setText("Button 9");
            return false;
        }
    });

But the problem with this code is that it only gets the OnTouchListener of the first button I touched. In simple words, when i move my finger, the button that I touched first changes the textView while the rest of the buttons don't.
I searched on the net and stackoverflow as well and I came across something like MotionEvent.ACTION_MOVE but I don't know how to use it and I am not sure if it is applicable in this case.
Please help me solve this problem! thank you for your time.

回答1:

This won't work in Android. If underlying View doesn't consume first event (ACTION_DOWN) by returning true, any other events that occur outside of it will be handled by parent View only. If it consume event - all events until ACTION_UP and it itself will be delivered to this View.

If you want to implement such behavior, you need to process all events within a single View, or override dispatchTouchEvent method of parent View to define your own behavior in that case.

回答2:

you can use a switch case :

//
button1.setOnTouchListener(this);
button2.setOnTouchListener(this);
button3.setOnTouchListener(this);
button4.setOnTouchListener(this);
button5.setOnTouchListener(this);
}

 @Override
        public boolean onTouch(View v, MotionEvent event) {
switch(v.getID())
{
case(R.id.btn1):
{
 textView.setText("Button 1");
 break;

}
case(R.id.btn2):
{
 textView.setText("Button 2");
 break;
}
case(R.id.btn3):
{
 textView.setText("Button 3");
break;
}
case(R.id.btn4):
{
 textView.setText("Button4");
break;
}
case(R.id.btn5):
{
 textView.setText("Button 5");
break;

default: // bla
}          

return true;
        }

回答3:

you can use setOnClickListener or switch case for doing whatever you want either you can implements OnTouchListener on your activity and use ACTION_UP

i am doing a first method for you here

button1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub 
             textView.setText("Button 1");          

        }
    });

button2.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub 
             textView.setText("Button 2");          

        }
    });

you can continue with this ...

来源：https://stackoverflow.com/questions/21813946/change-textview-while-moving-finger-across-buttons