动态添加imageview进行查看

Question

我正在制作使用视图类的安卓游戏。我不使用layout.all我的图像是用canvas绘制的。现在我的问题是我不能给位图

你知道的可触摸事件。我正在尝试动态地将imageview添加到我的视图类

使用可触摸事件。为什么我尝试动态添加imageview？因为我没有使用

layout.but我不能。有什么机构可以帮忙吗？

here is my code:


package com.example.poolmaster;

import java.util.ArrayList;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.Gravity;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;
import android.widget.LinearLayout;

public class MainActivity extends Activity {
    private int cuePosx,cuePosy;
    int cueHeight,cueWeight;
    double rotatingAngle;
    int height;
    int wwidth;
    int cueHeight2,cueWeight2;
    Bitmap table,stick,raise;
    ImageView button = new ImageView(this);
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);


        rotatingAngle=0;
        DisplayMetrics displaymetrics = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
         height = displaymetrics.heightPixels;
         wwidth = displaymetrics.widthPixels;
         cueHeight2=height/2;
         cueWeight2=wwidth/2;
        System.out.println("**************************************");
        System.out.println("height " +height);
        System.out.println("weight" +wwidth);
        System.out.println("**************************************");


        // Set generic layout parameters
         // Modify this

        GamePlay custom = new GamePlay(this);


        setContentView(custom);


       // setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
    @Override
    public boolean onTouchEvent(MotionEvent ev) {


        if(ev.getAction() == MotionEvent.ACTION_MOVE){
            //cuePosy+=10;
            //System.out.println("xCORDİNATES!!!! " +ev.getX());
            //System.out.println("yCORDİNATES!!!! " +ev.getY());
            rotatingAngle=getAngle(ev.getX(), ev.getY());
            System.out.println("Angle " +rotatingAngle);

        }
        if(ev.getAction()==MotionEvent.ACTION_DOWN){
            System.out.println("****************** ACTİON DOWN ****************");
            //cueHeight2+=10;
            //cueWeight2+=20;
            //cuePosy=320;
        }
        if(ev.getAction()==MotionEvent.ACTION_UP){
            System.out.println("****************** ACTİON DOWN ****************");
            //cueHeight2-=10;
            //cueWeight2-=20;
            //cuePosy=320;
        }
        return true;
    }
    private double getAngle(double xTouch, double yTouch) {
        double theta;

        theta=  Math.toDegrees( Math.atan2( height/2-yTouch , xTouch-wwidth/2) );

        return theta;

    }



    public class GamePlay extends View{

        public GamePlay(Context context) {
            super(context);
            // TODO Auto-generated constructor stub
            table=BitmapFactory.decodeResource(getResources(), R.drawable.bg);
            table= Bitmap.createScaledBitmap(table, wwidth, height, true);
            stick=BitmapFactory.decodeResource(getResources(), R.drawable.stick);

            raise=BitmapFactory.decodeResource(getResources(), R.drawable.raise);
            cueHeight=stick.getHeight();
            System.out.println("ıstaka " +cueHeight);
            cueWeight=stick.getWidth();
            cuePosx=wwidth/2;
            cuePosy=height-cueHeight-180;
        }
          @SuppressLint({ "DrawAllocation", "DrawAllocation" })
        @Override
            public void onDraw(Canvas canvas) {
                super.onDraw(canvas);

                Matrix matrix = new Matrix();
                matrix.setTranslate(cueWeight2, cueHeight2);
                matrix.postRotate((float)rotatingAngle,cueWeight2, cueHeight2); // anti-clockwise by 90 degrees

                // create a new bitmap from the original using the matrix to transform the result
                Bitmap rotatedBitmap = Bitmap.createBitmap(stick , 0, 0, stick .getWidth(), stick .getHeight(), matrix,false);


                canvas.save(); //Save the position of the canvas.
                canvas.restore();

                    //Rotate the canvas.
              canvas.drawBitmap(table, 0, 0, null); //Draw the ball on the rotated canvas.
              canvas.drawBitmap(stick, matrix,null);
              canvas.drawBitmap(raise, 0, 0,null);
              invalidate();


          }

    }
}

Answer 1

这是为了将imageview添加到Activity类扩展的布局

   LinearLayout lL = findViewById(R.id.xmlfile_layout_id);

   ImageView imgView = new ImageView(context); 

   imgView.setVisibility(View.VISIBLE);
   lL.addView(imgView);

这是用于将imageview添加到View类扩展的画布

最初，您无法使用画布放置任何imageview，编辑文本或按钮。相反，你必须绘制它。因此，创建一个自定义布局并使用画布绘制该布局

试试这个，它可能对你有所帮助。在onDraw(..)

   LinearLayout lL = new LinearLayout(context);

   ImageView imgView = new ImageView(context); 

   imgView.setVisibility(View.VISIBLE);
   lL.addView(imgView);

    lL.measure(canvas.getWidth(), canvas.getHeight());
    lL.layout(0, 0, canvas.getWidth(), canvas.getHeight());

    // placing the edit text at specific co-ordinates:
    //canvas.translate(0, 0);
    layout.draw(canvas);

再看看另一个例子：Click here

它提供了另一种添加视图的方式

Answer 2

使用以下代码。

动态创建ImageView

ImageView mImgView1 = new ImageView(this);

要添加到您的视图中，请在setContentView(custom);之前编写以下代码（如果GamePlay是您的View类）

custom.add(mImgView1);