自定义视图（重叠）图像视图

时间：2018-06-16 05:31:44

标签： android

我有自定义视图和2张图像视图。 我需要将自定义视图放在imageviews之间，因为它们会重叠，然后自定义视图将作为动画移动。

但是当我把它们放在下面的xml中时，我得到一个“ClassCastException：android.widget.ImageView无法转换为......”

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_margin="5sp"
    tools:context=".FinalActivity" >

       <ImageView
          android:id="@+id/imageView2"
          android:layout_width="776dp"
          android:layout_height="1154dp"
           android:adjustViewBounds="true"
    android:layout_marginLeft="0px"
    android:layout_marginTop="0px"
    android:scaleType="fitXY"
          android:layout_alignParentTop="true"
          android:layout_centerHorizontal="true"
          android:src="@drawable/oven_alt" />     

      <com.aktuna.game.pizzadaisy.myviewx
        android:id="@+id/xview"
        android:layout_width="400dp"
        android:layout_height="400dp"
      />

      <ImageView
          android:id="@+id/imageView1"
          android:layout_width="776dp"
          android:layout_height="1154dp"
           android:adjustViewBounds="true"
    android:layout_marginLeft="0px"
    android:layout_marginTop="0px"
    android:scaleType="fitXY"
          android:layout_alignParentTop="true"
          android:layout_centerHorizontal="true"
          android:src="@drawable/oven_ust" />


</RelativeLayout>

这是我得到的错误：

06-16 08:27:01.761: E/AndroidRuntime(23183): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.test.game/com.test.game.FinalActivity}: java.lang.ClassCastException: android.widget.ImageView cannot be cast to com.test.game.myviewx
06-16 08:27:01.761: E/AndroidRuntime(23183):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2955)
06-16 08:27:01.761: E/AndroidRuntime(23183):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3030)
06-16 08:27:01.761: E/AndroidRuntime(23183):    at android.app.ActivityThread.-wrap11(Unknown Source:0)
06-16 08:27:01.761: E/AndroidRuntime(23183):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
06-16 08:27:01.761: E/AndroidRuntime(23183):    at android.os.Handler.dispatchMessage(Handler.java:105)
06-16 08:27:01.761: E/AndroidRuntime(23183):    at android.os.Looper.loop(Looper.java:164)
06-16 08:27:01.761: E/AndroidRuntime(23183):    at android.app.ActivityThread.main(ActivityThread.java:6938)
06-16 08:27:01.761: E/AndroidRuntime(23183):    at java.lang.reflect.Method.invoke(Native Method)
06-16 08:27:01.761: E/AndroidRuntime(23183):    at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
06-16 08:27:01.761: E/AndroidRuntime(23183):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
06-16 08:27:01.761: E/AndroidRuntime(23183): Caused by: java.lang.ClassCastException: android.widget.ImageView cannot be cast to com.test.game.myviewx
06-16 08:27:01.761: E/AndroidRuntime(23183):    at com.aktuna.game.pizzadaisy.FinalActivity.onCreate(FinalActivity.java:49)
06-16 08:27:01.761: E/AndroidRuntime(23183):    at android.app.Activity.performCreate(Activity.java:7174)
06-16 08:27:01.761: E/AndroidRuntime(23183):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220)
06-16 08:27:01.761: E/AndroidRuntime(23183):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2908)
06-16 08:27:01.761: E/AndroidRuntime(23183):    ... 9 more

这是自定义视图的类：

public class myviewx extends View
    {

        public myviewx(Context context) {
            super(context);
            // TODO Auto-generated constructor stub
        }

        public myviewx(Context context, @Nullable AttributeSet attrs) {
            super(context, attrs);
            // TODO Auto-generated constructor stub
        }
        public myviewx(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
            super(context, attrs, defStyleAttr);
        }

        @Override
        protected void onDraw(Canvas canvas)
        {
            super.onDraw(canvas);

            float density = getResources().getDisplayMetrics().density;

            Resources res = getResources();
            Bitmap bitmap = BitmapFactory.decodeResource(res, R.drawable.base1);
            Bitmap brocoli = BitmapFactory.decodeResource(res, R.drawable.brocoli);
            Bitmap mint = BitmapFactory.decodeResource(res, R.drawable.mint);
            Random rand = new Random();            

            int x=500;
            int y=500;
            int radius=250;
            Paint paint=new Paint();
            // Use Color.parseColor to define HTML colors
            paint.setColor(Color.parseColor("#CD5C5C"));
            canvas.drawCircle(x,x, radius, paint);
            paint.setColor(Color.parseColor("#CD000C"));
            canvas.drawRect (250,250, 750, 750, paint); 
            canvas.drawBitmap(bitmap, 0, 0, paint);

            int xx[]=new int[15];;
            int yy[]=new int[15];;
            boolean dur=false;

            for (int i=0; i<10; i++) {
                dur=false;
                int  x1 = rand.nextInt(500) + 250;
                int  y1 = rand.nextInt(500) + 250;
                x1=750;
                y1=750;
                canvas.drawBitmap(brocoli, x1-(brocoli.getWidth()/density), y1-(brocoli.getHeight()/density), paint);
                x1=250;
                y1=250;
                canvas.drawBitmap(brocoli, x1-(brocoli.getWidth()/density), y1-(brocoli.getHeight()/density), paint);

            }

        }


    }

public class FinalActivity extends Activity {

    myviewx z1;    

    public void adjustFontScale(Configuration configuration) {
        if (configuration.fontScale > 1.20) {
            configuration.fontScale = (float) 1.20;
            DisplayMetrics metrics = getResources().getDisplayMetrics();
            WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
            wm.getDefaultDisplay().getMetrics(metrics);
            metrics.scaledDensity = configuration.fontScale * metrics.density;
            getBaseContext().getResources().updateConfiguration(configuration, metrics);
        }
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

        super.onCreate(savedInstanceState);

        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);

        adjustFontScale(getResources().getConfiguration());
        setContentView(R.layout.activity_final);

        z1 = (myviewx) findViewById(R.id.xview);

    }
    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        if(hasFocus){
            ObjectAnimator animation = ObjectAnimator.ofFloat(z1, "translationX", 100f);
            animation.setDuration(5000);
            animation.start();
            }   
    }


}

这真的不可能吗？ 我该怎么办？

3 个答案:

答案 0 :(得分：2)

请尝试使用此代码，并确保自定义视图路径，特别是在xml中。

package com.androidtestapp;
import android.animation.ObjectAnimator;
import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.content.res.Configuration;
import android.os.Bundle;
import android.os.StrictMode;
import android.util.DisplayMetrics;
import android.view.WindowManager;

public class FinalActivity extends Activity {

myviewx z1;    

public void adjustFontScale(Configuration configuration) {
    if (configuration.fontScale > 1.20) {
        configuration.fontScale = (float) 1.20;
        DisplayMetrics metrics = getResources().getDisplayMetrics();
        WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
        wm.getDefaultDisplay().getMetrics(metrics);
        metrics.scaledDensity = configuration.fontScale * metrics.density;
        getBaseContext().getResources().updateConfiguration(configuration, metrics);
    }
}

@Override
public void onCreate(Bundle savedInstanceState) {
    this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

    super.onCreate(savedInstanceState);

    StrictMode.ThreadPolicy policy = new     StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);

    adjustFontScale(getResources().getConfiguration());
    setContentView(R.layout.activity_main);

    z1 = (myviewx) findViewById(R.id.xview);

}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
    if(hasFocus){
        ObjectAnimator animation = ObjectAnimator.ofFloat(z1, "translationX", 100f);
        animation.setDuration(5000);
        animation.start();
        }   
}

}

=============================================== =========================== 

package com.androidtestapp;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;

import java.util.Random;

public class myviewx extends View
{

    public myviewx(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }

    public myviewx(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        // TODO Auto-generated constructor stub
    }
    public myviewx(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    @Override
    protected void onDraw(Canvas canvas)
    {
        super.onDraw(canvas);

        float density = getResources().getDisplayMetrics().density;

        Resources res = getResources();
        Bitmap bitmap = BitmapFactory.decodeResource(res, R.mipmap.ic_launcher_foreground);
        Bitmap brocoli = BitmapFactory.decodeResource(res, R.mipmap.ic_launcher_foreground);
        Bitmap mint = BitmapFactory.decodeResource(res, R.mipmap.ic_launcher_foreground);
        Random rand = new Random();

        int x=500;
        int y=500;
        int radius=250;
        Paint paint=new Paint();
        // Use Color.parseColor to define HTML colors
        paint.setColor(Color.parseColor("#CD5C5C"));
        canvas.drawCircle(x,x, radius, paint);
        paint.setColor(Color.parseColor("#CD000C"));
        canvas.drawRect (250,250, 750, 750, paint); 
        canvas.drawBitmap(bitmap, 0, 0, paint);

        int xx[]=new int[15];;
        int yy[]=new int[15];;
        boolean dur=false;

        for (int i=0; i<10; i++) {
            dur=false;
            int  x1 = rand.nextInt(500) + 250;
            int  y1 = rand.nextInt(500) + 250;
            x1=750;
            y1=750;
            canvas.drawBitmap(brocoli, x1-(brocoli.getWidth()/density), y1-(brocoli.getHeight()/density), paint);
            x1=250;
            y1=250;
            canvas.drawBitmap(brocoli, x1-(brocoli.getWidth()/density), y1-(brocoli.getHeight()/density), paint);

        }

    }


}

=============================================== ================================ 

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="5sp"
tools:context=".MainActivity" >

<ImageView
    android:id="@+id/imageView2"
    android:layout_width="776dp"
    android:layout_height="1154dp"
    android:adjustViewBounds="true"
    android:layout_marginLeft="0px"
    android:layout_marginTop="0px"
    android:scaleType="fitXY"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:src="@mipmap/ic_launcher" />

<com.androidtestapp.myviewx
    android:id="@+id/xview"
    android:layout_width="400dp"
    android:layout_height="400dp"
    />

<ImageView
    android:id="@+id/imageView1"
    android:layout_width="776dp"
    android:layout_height="1154dp"
    android:adjustViewBounds="true"
    android:layout_marginLeft="0px"
    android:layout_marginTop="0px"
    android:scaleType="fitXY"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:src="@mipmap/ic_launcher_round" />


</RelativeLayout>

答案 1 :(得分：0)

我尝试你的代码和自定义视图类给了我空指针错误我解决了它。 所以你提到的没有任何ClassCastException 您希望在顶部和两个图像视图之间自定义图像视图 因此，请尝试按如下所示更改xml布局

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:ads="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:adjustViewBounds="true"
        android:layout_marginLeft="0px"
        android:layout_marginTop="0px"
        android:scaleType="fitXY"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:src="@drawable/pax_icon" />

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:adjustViewBounds="true"
        android:layout_marginLeft="0px"
        android:layout_marginTop="0px"
        android:layout_gravity="bottom"
        android:scaleType="fitXY"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:src="@drawable/preferred_airline_icon" />

    <com.demoapplication.customView.myviewx
        android:id="@+id/xview"
        android:layout_width="400dp"
        android:layout_gravity="center"
        android:layout_height="400dp"
        />

</FrameLayout>

通过使用FrameLayout，我们可以获得彼此之上的视图 因此，请尝试按照上面的布局更改视图的顺序

答案 2 :(得分：0)

删除您的R文件，然后重新编译。 那应该解决它。 R文件是自动生成的，所以不用担心。它位于/project/gen/package_name/R.java

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