ViewPager和片段onClickListener无法正常工作 [英] ViewPager and Fragment onClickListener not working right

问题描述

我绝望了.我试图在Fragment类中添加onClickListener. 我的想法是我有一个ViewPager带有图像.我想要的只是单击图像本身，并显示一条祝酒消息.我知道您无法将OnClickListener注册到ViewPager本身，因此我尝试将其添加到处理ImageView的Fragment类中. 现在发生的是，onClick方法有效，如果我单击其中一张图像，它会显示一条消息，但会一直显示我使用的DEFAULT开关情况.我只是不能为我的生活而明白为什么……！ :( 这是代码，也许您可​​以看到解决方案?

Im desperate. Im trying to add an onClickListener in a Fragment class. The idea is that I have a ViewPager with images. All I want is to click on an image itself and have it display a toast message. I know you cant register an OnClickListener to the ViewPager itself, so I tried adding it in the Fragment class that handles the ImageView. What happens now is, the onClick method works, if I click on one of the images, it displays a message, but it keeps displaying the DEFAULT switch case I use. I just cant for the life of me understand why......! :( Here's the code maybe you can see a solution?

谢谢.

MainActivity:

MainActivity:

package com.example.viewpagerexample;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends FragmentActivity{

private static final int NUM_PAGES = 5;

private MyAdapter mAdapter;
private ViewPager mPager;

private Button leftBTN;
private Button rightBTN;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    mAdapter = new MyAdapter(getSupportFragmentManager());
    mPager = (ViewPager) findViewById(R.id.pager);
    mPager.setAdapter(mAdapter);


    leftBTN = (Button)findViewById(R.id.leftBTN);
    leftBTN.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            mPager.setCurrentItem(mPager.getCurrentItem()-1, true);
        }
    });

    rightBTN = (Button)findViewById(R.id.rightBTN);
    rightBTN.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            mPager.setCurrentItem(mPager.getCurrentItem()+1, true);
        }
    });
}

public static class MyAdapter extends FragmentPagerAdapter {

    public MyAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public int getCount() {
        return NUM_PAGES;
    }

    @Override
    public Fragment getItem(int position) {
        ImageFragment myFragment = new ImageFragment();
        Bundle data = new Bundle();
        data.putInt("current_page", position);
        myFragment.setArguments(data);
        return myFragment;
    }
}
}

这是带有OnClickListener实现的Fragment类:

And here is the Fragment class with the OnClickListener implementation:

package com.example.viewpagerexample;

import com.example.viewpagerexample.R;

import android.annotation.SuppressLint;  
import android.media.MediaPlayer;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.webkit.WebView.FindListener;
import android.widget.ImageView;
import android.widget.Toast;


public class ImageFragment extends Fragment implements OnClickListener{

private int position;
private ImageView imageView;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Bundle data = getArguments();
    position = data.getInt("current_page", 0);
}

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.image_details, container, false);
    imageView = (ImageView) view.findViewById(R.id.imageView1);
    imageView.setOnClickListener(this);

    switch (position) {
    case 0:
        imageView.setImageResource(R.drawable.splash);
        return view;
    case 1:
        imageView.setImageResource(R.drawable.girrafe);
        return view;
    case 2:
        imageView.setImageResource(R.drawable.lion);
        return view;
    case 3:
        imageView.setImageResource(R.drawable.monkey);
        return view;
    case 4:
        imageView.setImageResource(R.drawable.chicken);
        return view;
    default:
        return null;
    }
}

@Override
public void onClick(View v) {
    switch (v.getId()){
    case R.drawable.splash:
        Log.d("DEBUG", "image 0 pressed");
    Toast.makeText(getActivity(), "Pic 1", Toast.LENGTH_SHORT).show();
        return;
    case R.drawable.girrafe:
        Log.d("DEBUG", "image 1 pressed");
        Toast.makeText(getActivity(), "Pic 2", Toast.LENGTH_SHORT).show();
        return;
    case R.drawable.lion:
        Log.d("DEBUG", "image 2 pressed");
        Toast.makeText(getActivity(), "Pic 3", Toast.LENGTH_SHORT).show();
        return;
    case R.drawable.monkey:
        Log.d("DEBUG", "image 3 pressed");
        Toast.makeText(getActivity(), "Pic 4", Toast.LENGTH_SHORT).show();
        return;
    case R.drawable.chicken:
        Log.d("DEBUG", "image 4 pressed");
        Toast.makeText(getActivity(), "Pic 5", Toast.LENGTH_SHORT).show();
        return;
    default:
        Log.d("DEBUG", "v.getId(): " + v.getId());
        Log.d("DEBUG", "default pressed");
        Toast.makeText(getActivity(), "DEFAULT pressed!", Toast.LENGTH_SHORT).show();
        return;
    }
}

}

推荐答案

我认为在您的onclick方法中，v.getId()(被单击视图的ID)总是返回R.id.imageView1，这就是为什么您总是得到onClick中的默认开关大小写.

I think that in your onclick method, v.getId()(id of clicked view) returns always R.id.imageView1, that is why you are always getting the default switch case in onClick.

您将onClickListener设置为imageView，但是您忘记更改imageview的ID，因此该ID仍为R.id.imageView1，并且侦听器无法正确处理它.

You set onClickListener to your imageView, but you forgot to change the id of the imageview so the id is still R.id.imageView1 and your listener cannot handle it properly.

尝试像这样编辑onCreateView方法的switch语句:

Try to edit switch statement of your onCreateView method like this:

switch (position) {
case 0:
    imageView.setImageResource(R.drawable.splash);
    imageView.setId(R.drawable.splash);
    return view;
case 1:
    imageView.setImageResource(R.drawable.girrafe);
    imageView.setId(R.drawable.girrafe);
    return view;
case 2:
    imageView.setImageResource(R.drawable.lion);
    imageView.setId(R.drawable.lion);
    return view;
case 3:
    imageView.setImageResource(R.drawable.monkey);
    imageView.setId(R.drawable.monkey);
    return view;
case 4:
    imageView.setImageResource(R.drawable.chicken);
    imageView.setId(R.drawable.chicken);
    return view;
default:
    return null;
}

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