javaandroidmotionevent
Get button coordinates and detect if finger is over them - Android
I have 4 buttons in my android app activity. This is what it looks like:
As you can see, the textViews at the bottom of the screen display the x and y coordinates. The coordinates are in reference to a relative layout. (See below given code)
Now, what I want to do is get the x and y coordinates of the 4 buttons at runtime and then figure out if my finger is touching the buttons while moving or not. In simple words, I want to press the buttons by swiping my finger over them instead of lifting and touching. How can I achieve it? I want to implement it in my piano application.
I was able to get the coordinates on screen and they change as I move my finger.
So, my question is How can I get the coordinates of the buttons and detect if my finger is swiping above them?:
XML
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff"
android:id="@+id/relativelayout">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Y Cord : "
android:layout_marginLeft="10dp"
android:layout_marginBottom="10dp"
android:id="@+id/textView"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="X Cord : "
android:layout_marginLeft="10dp"
android:layout_marginBottom="10dp"
android:id="@+id/textView2"
android:layout_above="@+id/textView"
android:layout_alignParentLeft="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="@+id/textView3"
android:textColor="#000000"
android:layout_below="@+id/textView2"
android:layout_toRightOf="@+id/textView" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="@+id/textView4"
android:textColor="#000000"
android:layout_marginBottom="10dp"
android:layout_above="@+id/textView"
android:layout_toRightOf="@+id/textView" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="@+id/button"
android:textColor="#000000"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:textColor="#000000"
android:id="@+id/button2"
android:layout_below="@+id/button"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:textColor="#000000"
android:id="@+id/button3"
android:layout_below="@+id/button2"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="@+id/button4"
android:textColor="#000000"
android:layout_below="@+id/button3"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true" />
</RelativeLayout>
Java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TextView xcordview = (TextView) findViewById(R.id.textView4);
final TextView ycordview = (TextView) findViewById(R.id.textView3);
RelativeLayout touchview = (RelativeLayout) findViewById(R.id.relativelayout);
touchview.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
xcordview.setText(String.valueOf(event.getX()));
ycordview.setText(String.valueOf(event.getY()));
return true;
}
});
}
}
Thank you all very very much!
Update:
public class MainActivity extends Activity {
RelativeLayout touchview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TextView xcordview = (TextView) findViewById(R.id.textView4);
final TextView ycordview = (TextView) findViewById(R.id.textView3);
touchview = (RelativeLayout) findViewById(R.id.relativelayout);
touchview.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
xcordview.setText(String.valueOf(event.getX()));
ycordview.setText(String.valueOf(event.getY()));
for(int i = 0; i < touchview.getChildCount(); i++){
if(checkInterSection(touchview.getChildAt(i), event.getRawX(), event.getRawY())){
Button button = (Button) findViewById(R.id.button);
button.setBackgroundColor(Color.BLUE);
break;
}
}
return true;
}
});
}
private boolean checkInterSection(View view, float rawX, float rawY) {
int[] location = new int[2];
view.getLocationOnScreen(location);
int x = location[0];
int y = location[1];
int width = view.getWidth();
int height = view.getHeight();
//Check the intersection of point with rectangle achieved
return (!(rawX < x || rawY > x + width || rawY < y || rawY > y + height));
}
}
Solution
package com.example.touch;
import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;
public class MainActivity extends Activity {
Button b1, b2, b3, b4;
int b1x1, b1x2, b1y1, b1y2;
private TextView xcordview;
private TextView ycordview;
private TextView buttonIndicator;
private RelativeLayout touchview;
private static int defaultStates[];
private Button mLastButton;
private final static int[] STATE_PRESSED = {
android.R.attr.state_pressed,
android.R.attr.state_focused
| android.R.attr.state_enabled };
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
xcordview = (TextView) findViewById(R.id.textView4);
ycordview = (TextView) findViewById(R.id.textView3);
buttonIndicator = (TextView) findViewById(R.id.button_indicator);
touchview = (RelativeLayout) findViewById(R.id.relativelayout);
b1 = (Button) findViewById(R.id.button1);
b2 = (Button) findViewById(R.id.button2);
b3 = (Button) findViewById(R.id.button3);
b4 = (Button) findViewById(R.id.button4);
defaultStates = b1.getBackground().getState();
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
touchview.setOnTouchListener(new View.OnTouchListener() {
private boolean isInside = false;
@Override
public boolean onTouch(View v, MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
xcordview.setText(String.valueOf(x));
ycordview.setText(String.valueOf(y));
for (int i = 0; i < touchview.getChildCount(); i++) {
View current = touchview.getChildAt(i);
if (current instanceof Button) {
Button b = (Button) current;
if (!isPointWithin(x, y, b.getLeft(), b.getRight(), b.getTop(),
b.getBottom())) {
b.getBackground().setState(defaultStates);
}
if (isPointWithin(x, y, b.getLeft(), b.getRight(), b.getTop(),
b.getBottom())) {
b.getBackground().setState(STATE_PRESSED);
if (b != mLastButton) {
mLastButton = b;
buttonIndicator.setText(mLastButton.getText());
}
}
}
}
return true;
}
});
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
// TODO Auto-generated method stub
super.onWindowFocusChanged(hasFocus);
}
static boolean isPointWithin(int x, int y, int x1, int x2, int y1, int y2) {
return (x <= x2 && x >= x1 && y <= y2 && y >= y1);
}
}
layout file
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relativelayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#ffffff" >
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_marginBottom="10dp"
android:layout_marginLeft="10dp"
android:text="Y Cord : "
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/textView"
android:layout_alignParentLeft="true"
android:layout_marginBottom="10dp"
android:layout_marginLeft="10dp"
android:text="X Cord : "
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView2"
android:layout_toRightOf="@+id/textView"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#000000" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/textView"
android:layout_marginBottom="10dp"
android:layout_toRightOf="@+id/textView"
android:textAppearance="?android:attr/textAppearanceMedium"
android:textColor="#000000" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:text="B1"
android:textColor="#000000" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/button1"
android:text="B2"
android:textColor="#000000" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/button2"
android:text="B3"
android:textColor="#000000" />
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/button3"
android:text="B4"
android:textColor="#000000" />
<TextView
android:id="@+id/button_indicator"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="@+id/textView4"
android:layout_marginRight="33dp"
android:text="No one"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button_indicator"
android:layout_alignBottom="@+id/button_indicator"
android:layout_marginRight="29dp"
android:layout_toLeftOf="@+id/button_indicator"
android:text="Entered: "
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
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