本文介绍了卡片视图中放置在“图像"视图上的“图像"按钮未触发Onclick事件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我将图像按钮放在CardView内部的图像视图上方.我想在用户单击图像"按钮时触发一些操作.但是，第一个问题是，当我在MainActivity中使用findViewById获取图像按钮时，它返回null(可能是因为图像视图位于item_row xml中，该视图在卡片视图中显示行数据).
I have placed image button on top of image view which is inside a CardView. I want to trigger some action when user clicks on Image button. However first problem is when I get the image button using findViewById inside MainActivity, it returns null(may be because image view is inside item_row xml which shows row data in the card view).
另一个问题是如何解决Activity_main.xml不同的情况，这种情况包含recycler视图，该视图的item_row.xml在图像视图的顶部具有图像按钮.
The other problem is how to tackle such scenario where activity_main.xml is different which contains recycler view which has item_row.xml having image button on top of image view.
MainActivity.java
MainActivity.java
package com.innovation.myapp.jwelleryonrent.View;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.Toast;
import com.innovation.myapp.jwelleryonrent.R;
import com.innovation.myapp.jwelleryonrent.controller.jwelleryController;
import com.innovation.myapp.jwelleryonrent.model.adapter.CustomItemClickListner;
import com.innovation.myapp.jwelleryonrent.model.adapter.JwelleryAdapter;
import com.innovation.myapp.jwelleryonrent.model.pojo.JwelleryCollection;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity implements jwelleryController.JwelleryCallbackListener {
private Toolbar mToolbar;
private RecyclerView mRecyclerView;
private SwipeRefreshLayout mSwipeRefreshLayout;
private List<JwelleryCollection> mJwelleryList = new ArrayList<>();
private JwelleryAdapter mJwelleryAdapter;
private jwelleryController mController;
private boolean isInFavourites = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
configToolbar();
mController = new jwelleryController(MainActivity.this);
configViews();
ImageButton imgButton = (ImageButton) findViewById(R.id.favIcon);
imgButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Snackbar.make(v, "Item Added", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View rootView = inflater.inflate(R.layout.item_row, container, false);
ImageButton imgBtn = (ImageButton) findViewById(R.id.favIcon);
imgBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
addItemToBag(v);
}
});
return rootView;
}
private void addItemToBag(View v)
{
isInFavourites = true;
ImageButton btnFaviourite = (ImageButton) findViewById(R.id.favIcon);
if(isInFavourites==true) {
btnFaviourite.setImageResource(R.drawable.ic_favorite_white_24dp);
}
else
btnFaviourite.setImageResource(R.drawable.ic_favorite_border);
Snackbar.make(v, "Item added to Favourites", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
private void configToolbar() {
mToolbar = (Toolbar) this.findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
}
private void initializeAdapter()
{
mJwelleryAdapter = new JwelleryAdapter(mJwelleryList);
mJwelleryAdapter.setOnItemClickListner(new CustomItemClickListner() {
@Override
public void onItemClick(View v, int position) {
Toast.makeText(MainActivity.this, "Clicked Item: "+position,Toast.LENGTH_LONG).show();
}
});
// mJwelleryAdapter = new JwelleryAdapter(mJwelleryList, new CustomItemClickListner() {
// @Override
// public void onItemClick(View v, int position) {
// Toast.makeText(MainActivity.this, "Clicked Item: "+position,Toast.LENGTH_LONG).show();
// }
// });
mRecyclerView.setAdapter(mJwelleryAdapter);
mSwipeRefreshLayout.setColorSchemeColors(getResources().getColor(R.color.colorAccent),
getResources().getColor(R.color.colorPrimary),
getResources().getColor(R.color.colorPrimaryDark));
mSwipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
mController.startFetching();
}
});
}
private void configViews() {
mRecyclerView = (RecyclerView) this.findViewById(R.id.list);
mSwipeRefreshLayout = (SwipeRefreshLayout) this.findViewById(R.id.swipe);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.this));
mRecyclerView.setRecycledViewPool(new RecyclerView.RecycledViewPool());
mController.startFetching();
initializeAdapter();
// mJwelleryAdapter= new JwelleryAdapter(mJwelleryList);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onFetchStart() {
}
@Override
public void onFetchProgress(JwelleryCollection jwellery) {
mJwelleryAdapter.addJwellery(jwellery);
}
@Override
public void onFetchProgress(List<JwelleryCollection> jwelleryList) {
}
@Override
public void onFetchComplete() {
mSwipeRefreshLayout.setRefreshing(false);
}
@Override
public void onFetchFailure() {
}
}
activity_main.xml
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="@style/AppTheme.PopupOverlay"
android:elevation="8dp"/>
</android.support.design.widget.AppBarLayout>
<include layout="@layout/content_main" />
<android.support.design.widget.FloatingActionButton
android:id="@+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="@dimen/fab_margin"
android:src="@android:drawable/ic_dialog_email" />
</android.support.design.widget.CoordinatorLayout>
item_row.xml，其中在图像视图"顶部包含图像"按钮(id = favIcon).我想在favIcon上触发操作
item_row.xml which contains Image button (id=favIcon) on top of Image View. I want to trigger action on favIcon
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
card_view:cardCornerRadius="1dp"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="8dp"
android:layout_margin="5dp"
>
<ImageView
android:id="@+id/flowerImage"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:visibility="visible"/>
<ImageButton
android:id="@+id/favIcon"
android:layout_width="32dp"
android:layout_height="32dp"
android:scaleType="fitXY"
android:layout_margin="5dp"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:background="@drawable/ic_favorite_border"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/flowerImage"
android:orientation="vertical"
>
<TextView
android:id="@+id/flowerName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Medium Text"
android:textColor="@color/colorPrimary"
android:textAppearance="?android:attr/textAppearanceMedium"
/>
<TextView
android:id="@+id/flowerCategory"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Small Text"
android:layout_alignBottom="@id/flowerName"
android:textAppearance="?android:attr/textAppearanceSmall"
android:visibility="visible"/>
<TextView
android:id="@+id/flowerPrice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@id/flowerCategory"
android:text="New Text"
android:visibility="visible"/>
<TextView
android:id="@+id/flowerInstruction"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:text="New Text"
/>
</LinearLayout>
</RelativeLayout>
</android.support.v7.widget.CardView>
ViewHolder类的代码，
Code for ViewHolder class,
public class Holder extends RecyclerView.ViewHolder {
public TextView mName, mCategory, mPrice, mInstructions;
public ImageView mImage;
public Holder(View itemView) {
super(itemView);
mImage = (ImageView) itemView.findViewById(R.id.flowerImage);
mName = (TextView) itemView.findViewById(R.id.flowerName);
mCategory = (TextView) itemView.findViewById(R.id.flowerCategory);
mPrice = (TextView) itemView.findViewById(R.id.flowerPrice);
mInstructions = (TextView) itemView.findViewById(R.id.flowerInstruction);
ImageButton imgButton = (ImageButton) itemView.findViewById(R.id.favIcon);
imgButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
addItemToBag(v);
}
});
}
public Holder(View itemView,int ViewType,Context c) {
// Creating ViewHolder Constructor with View and viewType As a parameter
super(itemView);
}
推荐答案
尝试一下(添加了rootView):
try it (rootView added):
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
View rootView = inflater.inflate(R.layout.item_row, container, false);
ImageButton imgBtn = (ImageButton) rootView.findViewById(R.id.favIcon);
imgBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
addItemToBag(v);
}
});
return rootView;
}
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