在followimg类中,我使用hashmap导入了一个拇指图像,该图像保存为字符串。但是,我希望通过意图将此图像传递给 listview单项,即详细视图。如何将s_thumb字符串添加到 imageview中的详细活动? 这是主要活动,目的在底部:
import java.io.ByteArrayOutputStream;
import java.util.ArrayList;
import java.util.HashMap;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
public class CustomizedListView extends Activity {
// All static variables
static final String URL = "http://padihamcars.com/music.xml";
// XML node keys
static final String KEY_SONG = "song"; // parent node
static final String KEY_ID = "id";
static final String KEY_TITLE = "title";
static final String KEY_ARTIST = "artist";
static final String KEY_DURATION = "duration";
static final String KEY_THUMB_URL = "thumb_url";
ListView list;
LazyAdapter adapter;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL); // getting XML from URL
Document doc = parser.getDomElement(xml); // getting DOM element
NodeList nl = doc.getElementsByTagName(KEY_SONG);
// looping through all song nodes <song>
for (int i = 0; i < nl.getLength(); i++) {
// creating new HashMap
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
// adding each child node to HashMap key => value
map.put(KEY_ID, parser.getValue(e, KEY_ID));
map.put(KEY_TITLE, parser.getValue(e, KEY_TITLE));
map.put(KEY_ARTIST, parser.getValue(e, KEY_ARTIST));
map.put(KEY_DURATION, parser.getValue(e, KEY_DURATION));
map.put(KEY_THUMB_URL, parser.getValue(e, KEY_THUMB_URL));
// adding HashList to ArrayList
songsList.add(map);
}
list=(ListView)findViewById(R.id.list);
// Getting adapter by passing xml data ArrayList
adapter=new LazyAdapter(this, songsList);
list.setAdapter(adapter);
// Click event for single list row
list.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
HashMap<String, String> resultp = new HashMap<String, String>();
resultp = songsList.get(position);
String s_thumb=resultp.get(KEY_THUMB_URL);
String s_title=resultp.get(KEY_TITLE);
Intent intent = new Intent(CustomizedListView.this, SingleListItem_Attractions.class);
intent.putExtra("s_id", s_thumb);
intent.putExtra("s_title", s_title);
//other fields you want to send
startActivity(intent);
}
});
}
这是我的详细活动(单项):
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.ImageView;
public class SingleListItem_Attractions extends Activity{
Button button;
Button button2;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.single_list_item_view);
ImageView imageView = (InageView) findViewById(R.id.imageView1);
Intent i2 = getIntent();
String text2 =i2.getStringExtra("s_thumb");
imageView.setImageBitmap(text2);
TextView texts = (TextView) findViewById(R.id.textView1);
Intent i = getIntent();
String text1 =i.getStringExtra("s_title");
texts.setText(text1);
addListenerOnButton();
}
public void addListenerOnButton() {
final Context context = this;
button = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button2);
button.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent intent = new Intent(context, CustomizedListView.class);
startActivity(intent);
}
});
button2.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent intent = new Intent(context, CustomizedListView.class);
startActivity(intent);
}
});
}
}
问题在于ImageView试图通过字符串即text2设置。 从text2中的url字符串设置imageview的正确方法是什么? 提前谢谢!
答案 0 :(得分:0)
您可以使用排球库查看https://developer.android.com/training/volley/index.html
首先在你的gradle中
dependencies {
...
compile 'com.android.volley:volley:1.0.0'
}
然后创建一个RequestQueue
RequestQueue queue = Volley.newRequestQueue(this);
然后创建一个ImageRequest
ImageRequest request = new ImageRequest(yourUrl, new Response.Listener<Bitmap>() {
@Override
public void onResponse(Bitmap response) {
imageView.setImageBitmap(response);
}
}, 0, 0, null, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e(TAG, error.toString();
}
});
将请求添加到队列
queue.add(request);
答案 1 :(得分:0)
使用Universal Image Loader将图像设置为来自url的imageview。检查此Universal Image Loader
答案 2 :(得分:0)
用户毕加索图书馆:
compile 'com.squareup.picasso:picasso:2.5.2'
并使用意图传递图像网址,并使用Picasso库(如belo代码)在imageview中设置图像:
Picasso.with(context)
.load(url)
.resize(50, 50)
.centerCrop()
.into(imageView)
答案 3 :(得分:0)
您可以使用第三方库快速可靠地通过网址显示图片。
我推荐Glide: https://github.com/bumptech/glide
在上面的链接中,您应该对下载和如何使用Glide? strong>这些内容感兴趣,以便将Glide包含在您的项目中并使用它。
总而言之,在详细活动(单项)中加载图片的最终代码应如下所示:
Glide
.with(getContext())
.load(text2)
.into(imageView);
Glide(以及其他图像库)将为您提供许多自定义图像的方法(例如缩放,调整大小)。请参阅文档。