Android开发-onclicklistener设置错误的图像

在上一个方法（myClicklistener4）上面的代码中，我试图按照前面的说明设置imageResources，但是它将它们设置为.whynotpng，就像第三个类中一样。我不确定为什么会发生这种情况

我无法告诉您错误发生的具体位置，因为我看不到您的代码中有任何特别的错误。这是你的代码。现在能用了吗？您是否已将所有绘图内容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 {

    @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);
        }

    }



}

---

缩短代码的方法之一，已经用“Endzeit”解释过了

下面介绍了缩短代码的另一种方法：

第一:

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;
        }
    }
}

例如：

Add  android:onClick="method name" in all 4 Buttons in your xml file.

---

注意：在这种情况下，您不必查找按钮的ID。

是否执行其他onClick的工作？此外，您的代码可以大幅缩短。是的，前两次单击按预期工作，但最后两次不工作，我如何缩短代码？感谢缩短代码..仅应用1 onClickListner将其作为arg应用，并按照eclipse指令和使用开关案例在onClick（）中进行单独工作。您也应用了底部2中的imageview1/2，您只需要它们。。？

<Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="myClick"
        android:text="button1" />

public class MainActivity extends Activity {

private ImageView imageView1, imageView2;

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

    imageView1 = (ImageView) findViewById(R.id.imageView1);
    imageView2 = (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 myClick(View view) {
    // depending on which button is clicked do some action
    switch(view.getId()) {
        case R.id.button1:
            imageView1.setImageResource(R.drawable.happypng);
            break;
        case R.id.button2:
            imageView2.setImageResource(R.drawable.happypng);
            break;
        case R.id.button3:
            imageView1.setImageResource(R.drawable.whynotpng);
            imageView2.setImageResource(R.drawable.whynotpng);
            break;
        case R.id.button4:
            imageView1.setImageResource(R.drawable.ic_launcher);
            imageView2.setImageResource(R.drawable.apple_gray_logo);
            break;
    }
  }
}