Question

我试图在点击按钮时切换图像..但我失败并得到了错误这是我的代码....请有人帮助我!! 如果需要，请添加XML代码也请发布相同的

package com.conn;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ViewSwitcher.ViewFactory;

public class image_slider extends Activity
{

        Integer[] imageIDs = { R.drawable.haha,  R.drawable.dte,R.drawable.new_login };
        private ImageSwitcher imageSwitcher;
        private Button nextButton;
        private Button previousButton; 

        @Override
        public void onCreate(Bundle savedInstanceState)
        {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.imgslide);
            imageSwitcher.setImageResource(imageIDs[0]);
            nextButton = (Button) findViewById(R.id.next);
            nextButton.setOnClickListener(new View.OnClickListener()
            {
                public void onClick(View v)
                {
                    final Animation out= AnimationUtils.loadAnimation(this, android.R.anim.slide_out_right);       
                    final Animation in= AnimationUtils.loadAnimation(this, android.R.anim.slide_in_left);     
                    imageSwitcher = (ImageSwitcher) findViewById(R.id.switcher1);      
                    imageSwitcher.setFactory(this);   
                    imageSwitcher.setInAnimation(in);      
                    imageSwitcher.setOutAnimation(out);             
                    imageSwitcher.setImageResource(imageIDs[1]);
//                  imageSwitcher.setImageResource(imageIDs[1]);

                }

            }); 

            previousButton = (Button) findViewById(R.id.previous);
            previousButton.setOnClickListener(new View.OnClickListener()
            {
                public void onClick(View v)
                {
                    final Animation out= AnimationUtils.loadAnimation(this, android.R.anim.slide_out_left);
                    final Animation in= AnimationUtils.loadAnimation(this, android.R.anim.slide_in_right);
                    imageSwitcher.setFactory(this);
                    imageSwitcher.setInAnimation(in);
                    imageSwitcher.setOutAnimation(out);
                    imageSwitcher.setImageResource(imageIDs[0]);

                }

            });
        }
public View makeView()
    {
        ImageView imageView = new ImageView(this);
        imageView.setBackgroundColor(0xFF000000);
                imageView.setScaleType(ImageView.ScaleType.CENTER);
        imageView.setLayoutParams(new ImageSwitcher.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
        return imageView;
    }       

}

Answer 1

您的问题是，当您在this中引用OnClickListener时，您指的是该特定的聆听者，而不是您当前的活动。你应该把它改成

 final Animation out= AnimationUtils.loadAnimation(image_slider.this, android.R.anim.slide_out_right); 
 final Animation in= AnimationUtils.loadAnimation(image_slider.this, android.R.anim.slide_in_left);
 ...
 imageSwitcher.setFactory(image_slider.this);

并使用android.R.anim.slide_in_left和android.R.anim.slide_out_right而不是slide_out_left和“slide_in_right”，因为这些不存在。

顺便说一句，良好的Java实践是用大写字母开始你的类名，例如ImageSlider

图像切换按钮单击

1 个答案: