ViewPager和片段onClickListener無法正常工作

Question

我很絕望。 我試圖在Fragment類中添加onClickListener 。 這個想法是我有一個帶有圖像的ViewPager 。 我想要的只是單擊圖像本身，並顯示一條祝酒消息。 我知道您無法向ViewPager本身注冊OnClickListener ，因此我嘗試將其添加到處理ImageView的Fragment類中。 現在發生的是， onClick方法有效，如果我單擊其中一張圖像，它會顯示一條消息，但會一直顯示我使用的DEFAULT開關情況。 我只是不能為我的生活而明白為什么……！ :(這是代碼，也許您可​​以看到解決方案？

謝謝。

主要活動：

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;
    }
}
}

這是帶有OnClickListener實現的Fragment類：

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;
    }
}

}

Answer 1

我認為在您的onclick方法中， v.getId() （被單擊視圖的ID）始終返回R.id.imageView1，這就是為什么您總是在onClick中獲得默認開關大小寫的原因。

您將onClickListener設置為imageView，但是您忘記更改imageview的ID，因此該ID仍為R.id.imageView1，並且偵聽器無法正確處理它。

嘗試像這樣編輯onCreateView方法的switch語句：

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;
}