Android开发-onclicklistener设置错误图片

Question

package com.example.sliderapp;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // add functionality for android button
        MyClickListener listener = new MyClickListener();
        Button button = (Button) findViewById(R.id.button1);
        button.setOnClickListener(listener);

        // add functionality for apple button
        MyClickListener2 listener2 = new MyClickListener2();
        Button button2 = (Button) findViewById(R.id.button2);
        button2.setOnClickListener(listener2);

        // Add functionality for don't care button
        MyClickListener3 listener3 = new MyClickListener3();
        Button button3 = (Button) findViewById(R.id.button3);
        button3.setOnClickListener(listener3);

        //Add functionality for reset button
        MyClickListener4 listener4 = new MyClickListener4();
        Button button4 = (Button) findViewById(R.id.button4);
        button4.setOnClickListener(listener4);


    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    /**
     * click listener method referring to android button
     * 
     * @author Ross
     * 
     */
    private class MyClickListener implements View.OnClickListener {

        public void onClick(View view) {

            ImageView imageView = (ImageView) findViewById(R.id.imageView1);

            imageView.setImageResource(R.drawable.happypng);
        }

    }

    /**
     * click listener method referring to apple button
     * 
     * @author Ross
     * 
     */
    private class MyClickListener2 implements View.OnClickListener {

        public void onClick(View view) {

            ImageView imageView = (ImageView) findViewById(R.id.imageView2);

            imageView.setImageResource(R.drawable.happypng);
        }

    }

    /**
     * Click listener referring to don't care button
     * @author Ross
     *
     */
    private class MyClickListener3 implements View.OnClickListener {

        public void onClick(View view) {

            ImageView imageView = (ImageView) findViewById(R.id.imageView1);

            imageView.setImageResource(R.drawable.whynotpng);

            ImageView imageView2 = (ImageView) findViewById(R.id.imageView2);

            imageView2.setImageResource(R.drawable.whynotpng);
        }

    }

    /**
     * Click listener referring to Reset button
     * @author Ross
     *
     */
    private class MyClickListener4 implements View.OnClickListener {

        public void onClick(View view) {

            ImageView imageView = (ImageView) findViewById(R.id.imageView1);

            imageView.setImageResource(R.drawable.ic_launcher);

            ImageView imageView2 = (ImageView) findViewById(R.id.imageView2);

            imageView2.setImageResource(R.drawable.apple_gray_logo);
        }

    }



}

在最后一个方法 (myClicklistener4) 上面的代码中，我试图按照说明设置 imageResources，但是它将它们设置为等于 .whynotpng，就像在第 3 类中一样。我不确定为什么会这样。

Answer 1

我无法告诉您错误发生的确切位置，因为我在您的代码中看不到任何特别的错误。这是您的代码缩短了。现在有用吗？您是否已将所有可绘制对象保存在正确的文件夹中并使用正确的名称？

package com.example.sliderapp;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity implements View.OnClickListener {

    private ImageView ivFirst, ivSecond;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // register your button listeners
        ((Button) findViewById(R.id.button1)).setOnClickListener(this);
        ((Button) findViewById(R.id.button2)).setOnClickListener(this);
        ((Button) findViewById(R.id.button3)).setOnClickListener(this);
        ((Button) findViewById(R.id.button4)).setOnClickListener(this);
        // you can also define the onClick method via xml by calling   android:onClick="onClick"

        // save your ImageViews so that you don't have to find them for every buttonclick
        ivFirst = (ImageView) findViewById(R.id.imageView1);
        ivSecond = (ImageView) findViewById(R.id.imageView2);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public void onClick(View view) {
        // depending on which button is clicked do some action
        switch(view.getId()) {
            case R.id.button1:
                ivFirst.setImageResource(R.drawable.happypng);
                break;
            case R.id.button2:
                ivFirst.setImageResource(R.drawable.happypng);
                break;
            case R.id.button3:
                ivFirst.setImageResource(R.drawable.whynotpng);
                ivSecond.setImageResource(R.drawable.whynotpng);
                break;
            case R.id.button4:
                ivFirst.setImageResource(R.drawable.ic_launcher);
                ivSecond.setImageResource(R.drawable.apple_gray_logo);
                break;
        }
    }
}