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這裏是我的main_activity.xml文件：到自定義視圖中添加一個按鈕在安卓
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
tools:context="barnquilt.nkc.com.barnquiltmaker.MainActivity">
<view
android:layout_width="500dp"
android:layout_height="500dp"
class="barnquilt.nkc.com.barnquiltmaker.Qulits.MainDrawingView"
android:id="@+id/single_touch_view"
android:background="#ffffff"
/>
我想在視圖標籤中添加一個按鈕，使的onClick去我MainDrawingView類不是MainActivity類。
我已經試過這樣：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
tools:context="barnquilt.nkc.com.barnquiltmaker.MainActivity">
<view
android:layout_width="500dp"
android:layout_height="500dp"
class="barnquilt.nkc.com.barnquiltmaker.Qulits.MainDrawingView"
android:id="@+id/single_touch_view"
android:background="#ffffff"
<Button
<!--
Add layout width and layout height here
-->
android:text = "test"
android:onClick = "changeColor"
/>
/>
</RelativeLayout>
它說，該方法changeColor沒有在MainActivity定義。我會如何做到這一點，然後它轉到我的MainDraingView類呢？謝謝！ 這裏是MainDrawingView類：
package barnquilt.nkc.com.barnquiltmaker.Qulits;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import java.util.ArrayList;
import java.util.List;
import barnquilt.nkc.com.barnquiltmaker.BitMap.blue;
import barnquilt.nkc.com.barnquiltmaker.BitMap.red;
import barnquilt.nkc.com.barnquiltmaker.R;
/**
* Created by pokem on 6/1/2017.
*/
//The 2 * 2 barn quilt
public class MainDrawingView extends View {
public float eventX;
public float eventY;
public List<Point>redPointList = new ArrayList<Point>();
public List<Point>bluePointList = new ArrayList<Point>();
public Point redPoint = new Point();
public Point bluePoint = new Point();
Context context = getContext();
//Bitmaps
public Bitmap redSquare;
public Bitmap blueSquare;
//Colors
public boolean red = false;
public boolean blue = false;
//Squares
public int width = context.getResources().getDisplayMetrics().widthPixels;
public int height = context.getResources().getDisplayMetrics().heightPixels;
public int center = height/2;
public int widthDiv = width/2;
private Paint redPaint = new Paint();
private Paint bluePaint = new Paint();
private Paint black = new Paint();
private Point pointStart = new Point();
private Point pointEnd = new Point();
public MainDrawingView(Context context, AttributeSet attrs){
super(context, attrs);
redPaint.setAntiAlias(true);
redPaint.setStrokeWidth(5f);
redPaint.setColor(Color.RED);
redPaint.setStyle(Paint.Style.STROKE);
redPaint.setStrokeJoin(Paint.Join.ROUND);
bluePaint.setAntiAlias(true);
bluePaint.setStrokeWidth(5f);
bluePaint.setColor(Color.BLUE);
bluePaint.setStyle(Paint.Style.STROKE);
bluePaint.setStrokeJoin(Paint.Join.ROUND);
black.setAntiAlias(true);
black.setStrokeWidth(5f);
black.setColor(Color.BLACK);
black.setStyle(Paint.Style.STROKE);
black.setStrokeJoin(Paint.Join.ROUND);
//define bitmap
redSquare = BitmapFactory.decodeResource(getResources(), R.drawable.red);
blueSquare = BitmapFactory.decodeResource(getResources(), R.drawable.blue);
}
@Override
public void onDraw(Canvas canvas){
//canvas.drawPath(path, paint);
canvas.drawLine(pointStart.x, pointStart.y, pointEnd.x, pointEnd.y,black);
//Makes a straight line go through the center of the screen.
canvas.drawLine(0,height/2.5f, width,height/2.5f,black);
//Makes a straight line go up and down.
canvas.drawLine(width/2.3f,0, width/2.3f, height,black);
//if(red){
for(Point point : redPointList){
new red(redSquare,canvas,point.x, point.y);
}
//}
//if(blue){
for(Point pointt : bluePointList){
new blue(blueSquare,canvas,pointt.x, pointt.y);
}
//}
}
@Override
public boolean onTouchEvent(final MotionEvent event){
//Gets the coords of the tap
redPoint.x = (int) event.getX();
redPoint.y = (int) event.getY();
bluePoint.x = (int) event.getX();
bluePoint.y = (int)event.getY();
eventX = event.getX();
eventY = event.getY();
int pointX = Math.round(eventX);
int pointY = Math.round(eventY);
//Shows the popup dialog when the user touches the screen
AlertDialog.Builder alertThing = new AlertDialog.Builder(getContext());
alertThing.setTitle("edit square");
alertThing.setMessage("please choose an option");
alertThing.setPositiveButton("red", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
red = true;
blue = false;
invalidate();
}
});
alertThing.setNeutralButton("Chnange color to blue", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
bluePointList.add(bluePoint);
blue = true;
red = false;
invalidate();
}
});
alertThing.create();
alertThing.show();
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
//Sets a new starting point
pointStart.set(pointX,pointY);
return true;
case MotionEvent.ACTION_UP:
//Contects the points
pointEnd.set(pointX,pointY);
break;
default:
return false;
}
invalidate();
return true;
}
}