如何在 Picasso 中设置 onClickListener
How to set onClickListener in Picasso
我是一个 Android 初学者,我正在构建一个音板应用程序来获得乐趣,我正在使用 Picasso
并排显示 2 列 ImageButton
。为什么是毕加索?因为使用简单的 ScrollView
和 ImageButton
我的应用程序在向下滚动时滞后很多。
无论如何,我试图在点击图片时播放声音,但我在互联网上找不到与此相关的任何内容。
这是我的代码:
ImageListAdapter.java
package com.kitbass.mastersynthetizer;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import com.squareup.picasso.Picasso;
public class ImageListAdapter extends ArrayAdapter {
private Context context;
private LayoutInflater inflater;
private Integer[] imageResources;
static class ViewHolder {
ImageButton mImageButton;
}
public ImageListAdapter(Context context, Integer[] imageUrls) {
super(context, R.layout.listview_item_image, imageUrls);
this.context = context;
this.imageResources = imageUrls;
inflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// ViewHolder pattern in play
ViewHolder viewHolder;
if (null == convertView) {
viewHolder = new ViewHolder();
convertView = inflater.inflate(R.layout.listview_item_image, parent, false);
viewHolder.mImageButton = (ImageButton) convertView.findViewById(R.id.iv_button);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
Picasso
.with(context)
.load(imageResources[position])
.fit()
.centerInside()
.into(viewHolder.mImageButton);
return convertView;
}
}
PicassoActivity.java
GridView gridView = (GridView) findViewById(R.id.heenok_grid_view);
gridView.setAdapter(new ImageListAdapter(PicassoActivity.this, imgResourcesHeenok));
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
Toast.makeText(PicassoActivity.this, "" + position, Toast.LENGTH_SHORT).show();
}
});
activity_picasso.xml
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/heenok_grid_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:numColumns="2" />
listview_item_image.xml
<?xml version="1.0" encoding="utf-8"?>
<ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/iv_button"
android:layout_width="match_parent"
android:layout_height="121dp"
android:background="@null"
android:foreground="?attr/selectableItemBackgroundBorderless" />
谢谢!
UPDATE :错误是我使用的是 ImageButton
而不是 ImageView
... 这就是为什么我连一个Toast
工作
首先,我会为您的适配器做一些不同的事情class 使用 ViewHolder 模式回收您的视图:
将您的 xml 更改为:
- 添加一个 ID
- 移除 onClick 方法调用
根据:
<?xml version="1.0" encoding="utf-8"?>
<ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/iv_button"
android:layout_width="match_parent"
android:layout_height="121dp"
android:background="@null"
android:foreground="?attr/selectableItemBackgroundBorderless"/>
然后在您的适配器中使用 ViewHolder 模式:
public class ImageListAdapter extends ArrayAdapter {
private Context context;
private LayoutInflater inflater;
private Integer[] imageResources;
static class ViewHolder{
ImageButton mImageButton;
}
public ImageListAdapter(Context context, Integer[] imageUrls) {
super(context, R.layout.listview_item_image, imageUrls);
this.context = context;
this.imageResources = imageUrls;
inflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// ViewHolder pattern in play
ViewHolder viewHolder;
if (null == convertView) {
viewHolder = new ViewHolder();
convertView = inflater.inflate(R.layout.listview_item_image, parent, false);
viewHolder.mImageButton = (ImageButton) convertView.findViewById(R.id.iv_button);
convertView.setTag(viewHolder);
}else{
viewHolder = (ViewHolder) convertView.getTag();
}
Picasso
.with(context)
.load(imageResources[position])
.fit()
.centerInside()
.into(viewHolder.mImageButton);
return convertView;
}
}
或者换成更流行的RecyclerView
那么由于您使用 GridView
来处理点击,因此您需要在 Activity class:
中添加 AdapterView.OnItemClickListener
mGridView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l){
//... handle the sound playing here
// onSoundButtonClick() ? maybe
}
});
对于所有这些你可以找到一个例子here
祝你好运,编码愉快!
更新您的 listview_item_image.xml 如下:
<?xml version="1.0" encoding="utf-8"?>
<ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/image_button"
android:layout_width="match_parent"
android:layout_height="121dp"
android:background="@null"
android:foreground="?attr/selectableItemBackgroundBorderless"/>
更新 ImageListAdapter 方法 getView() 为:
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (null == convertView) {
convertView = inflater.inflate(R.layout.listview_item_image, parent, false);
}
ImageButton imageButton = (ImageButton) convertView.findViewById(R.id.image_button);
Picasso
.with(context)
.load(imageResources[position])
.fit()
.centerInside()
.into(imageButton);
return convertView;
}
希望这会奏效。
我是一个 Android 初学者,我正在构建一个音板应用程序来获得乐趣,我正在使用 Picasso
并排显示 2 列 ImageButton
。为什么是毕加索?因为使用简单的 ScrollView
和 ImageButton
我的应用程序在向下滚动时滞后很多。
无论如何,我试图在点击图片时播放声音,但我在互联网上找不到与此相关的任何内容。
这是我的代码:
ImageListAdapter.java
package com.kitbass.mastersynthetizer;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import com.squareup.picasso.Picasso;
public class ImageListAdapter extends ArrayAdapter {
private Context context;
private LayoutInflater inflater;
private Integer[] imageResources;
static class ViewHolder {
ImageButton mImageButton;
}
public ImageListAdapter(Context context, Integer[] imageUrls) {
super(context, R.layout.listview_item_image, imageUrls);
this.context = context;
this.imageResources = imageUrls;
inflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// ViewHolder pattern in play
ViewHolder viewHolder;
if (null == convertView) {
viewHolder = new ViewHolder();
convertView = inflater.inflate(R.layout.listview_item_image, parent, false);
viewHolder.mImageButton = (ImageButton) convertView.findViewById(R.id.iv_button);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
Picasso
.with(context)
.load(imageResources[position])
.fit()
.centerInside()
.into(viewHolder.mImageButton);
return convertView;
}
}
PicassoActivity.java
GridView gridView = (GridView) findViewById(R.id.heenok_grid_view);
gridView.setAdapter(new ImageListAdapter(PicassoActivity.this, imgResourcesHeenok));
gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
Toast.makeText(PicassoActivity.this, "" + position, Toast.LENGTH_SHORT).show();
}
});
activity_picasso.xml
<GridView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/heenok_grid_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:numColumns="2" />
listview_item_image.xml
<?xml version="1.0" encoding="utf-8"?>
<ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/iv_button"
android:layout_width="match_parent"
android:layout_height="121dp"
android:background="@null"
android:foreground="?attr/selectableItemBackgroundBorderless" />
谢谢!
UPDATE :错误是我使用的是 ImageButton
而不是 ImageView
... 这就是为什么我连一个Toast
工作
首先,我会为您的适配器做一些不同的事情class 使用 ViewHolder 模式回收您的视图:
将您的 xml 更改为:
- 添加一个 ID
- 移除 onClick 方法调用
根据:
<?xml version="1.0" encoding="utf-8"?>
<ImageButton xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/iv_button"
android:layout_width="match_parent"
android:layout_height="121dp"
android:background="@null"
android:foreground="?attr/selectableItemBackgroundBorderless"/>
然后在您的适配器中使用 ViewHolder 模式:
public class ImageListAdapter extends ArrayAdapter {
private Context context;
private LayoutInflater inflater;
private Integer[] imageResources;
static class ViewHolder{
ImageButton mImageButton;
}
public ImageListAdapter(Context context, Integer[] imageUrls) {
super(context, R.layout.listview_item_image, imageUrls);
this.context = context;
this.imageResources = imageUrls;
inflater = LayoutInflater.from(context);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// ViewHolder pattern in play
ViewHolder viewHolder;
if (null == convertView) {
viewHolder = new ViewHolder();
convertView = inflater.inflate(R.layout.listview_item_image, parent, false);
viewHolder.mImageButton = (ImageButton) convertView.findViewById(R.id.iv_button);
convertView.setTag(viewHolder);
}else{
viewHolder = (ViewHolder) convertView.getTag();
}
Picasso
.with(context)
.load(imageResources[position])
.fit()
.centerInside()
.into(viewHolder.mImageButton);
return convertView;
}
}
或者换成更流行的RecyclerView
那么由于您使用 GridView
来处理点击,因此您需要在 Activity class:
AdapterView.OnItemClickListener
mGridView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l){
//... handle the sound playing here
// onSoundButtonClick() ? maybe
}
});
对于所有这些你可以找到一个例子here
祝你好运,编码愉快!
更新您的 listview_item_image.xml 如下:
<?xml version="1.0" encoding="utf-8"?> <ImageButton xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/image_button" android:layout_width="match_parent" android:layout_height="121dp" android:background="@null" android:foreground="?attr/selectableItemBackgroundBorderless"/>
更新 ImageListAdapter 方法 getView() 为:
@Override public View getView(int position, View convertView, ViewGroup parent) { if (null == convertView) { convertView = inflater.inflate(R.layout.listview_item_image, parent, false); } ImageButton imageButton = (ImageButton) convertView.findViewById(R.id.image_button); Picasso .with(context) .load(imageResources[position]) .fit() .centerInside() .into(imageButton); return convertView; }
希望这会奏效。