Question

我的Android应用活动中有4个按钮。这就是它的样子：

如您所见，屏幕底部的textViews显示x和y坐标。坐标参考相对布局。（见下面给出的代码）

现在，我想要做的是在运行时获取4个按钮的x和y坐标，然后确定我的手指是否在移动时触摸按钮。简单来说，我想用手指按住按钮而不是抬起和触摸按钮。我怎样才能实现它？我想在我的钢琴应用程序中实现它。

我能够在屏幕上获得坐标，当我移动手指时它们会发生变化所以，我的问题是如何获取按钮的坐标并检测我的手指是否在它们上方滑动？：
的 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>

爪哇

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;
        }
    });

  }
}

非常感谢你们！

更新

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));
}

}

Answer 1

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);
    }
}

布局文件

<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>

Answer 2

private boolean checkInterSection(View view, int rawX, int raxY) {
    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)); 
}

for(int i = 0; i < touchview.getChildCount(); i++){
    if(checkInterSection(touchview.getChildAt(i), event.getRawX(), event.getRawY())){
        if(checkInterSection(touchview.getChildAt(i), event.getRawX(), event.getRawY())){
            ((Button)touchview.getChildAt(i)).setBackgroundColor(Color.BLUE);// Type casting may not be required 
        }else{
            ((Button)touchview.getChildAt(i)).setBackgroundColor(Color.WHITE);
        }
        break;
    }
}

Answer 3

对于OnTouchListener，

getX（）getY（）给出相对于相应视图的坐标。

如果您更喜欢屏幕坐标，则可以使用以下其中一种

覆盖onTouchEvent以获取活动并删除按钮的OnTouchListener-s ，在这种情况下，MotionEvent将报告屏幕坐标而不是按钮坐标

   @Override 
   public boolean onTouchEvent (MotionEvent event) {
       xcordview.setText(String.valueOf(event.getX()));
       ycordview.setText(String.valueOf(event.getY()));
       return true;
   }

在OnTouchListener中使用getTop（）getLeft（）获取按钮：

  touchview.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        xcordview.setText(String.valueOf(event.getX()+v.getLeft()));
        ycordview.setText(String.valueOf(event.getY()+v.getTop()));
        return true;
    }
});

您可以考虑使用GestureDetector来检测滑动，但这并不是必需的。

Answer 4

karioki的解决方案效果很好。为了即使在我们从其中一个按钮开始移动时也能使其正常工作，只需添加

android：clickable =“ false”

用于xml中的每个按钮。

获取按钮坐标并检测手指是否在他们身上 - Android

4 个答案: