我想在视图
pager
中显示图片。我创建了一个班级pageradapter
并使用imageloader library
从互联网上获取图片,但屏幕上没有任何内容。我的日志猫一行红色:
02-08 12:34:12.582 3560-3560/? E/libEGL: call to OpenGL ES API with no current context (logged once per thread)
我的pager adapter
课程:
package autogenie.dg10;
import android.content.Context;
import android.support.v4.view.PagerAdapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import java.util.List;
public class pageradapter extends PagerAdapter {
Context mContext;
LayoutInflater mLayoutInflater;
List<String> l = MainActivity.list;
ImageLoader mImageLoader;
public pageradapter(Context context) {
mContext = context;
mLayoutInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return 4;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
View itemView = mLayoutInflater.inflate(R.layout.img, container, false);
ImageLoader mImageLoader = ImageLoader.getInstance();
mImageLoader.init(ImageLoaderConfiguration.createDefault(mContext));
ImageView imageView = (ImageView) itemView.findViewById(R.id.imageView3);
mImageLoader.displayImage("http://www.airtel.in/4g/images/airtel_4g_hotspot_responsive.jpg", imageView);
container.addView(itemView);
return itemView;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((LinearLayout) object);
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view==object;
}
}
myapplication class:
package autogenie.dg10;
import android.app.Application;
import android.content.Context;
import android.os.Build;
import android.os.StrictMode;
import android.provider.SyncStateContract;
import com.nostra13.universalimageloader.cache.disc.naming.Md5FileNameGenerator;
import com.nostra13.universalimageloader.cache.memory.impl.WeakMemoryCache;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.assist.QueueProcessingType;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;
public class MyApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
initImageLoader(getApplicationContext());
}
public static void initImageLoader(Context context) {
// This configuration tuning is custom. You can tune every option, you may tune some of them,
// or you can create default configuration by
// ImageLoaderConfiguration.createDefault(this);
// method.
ImageLoaderConfiguration.Builder config = new ImageLoaderConfiguration.Builder(context);
config.threadPriority(Thread.NORM_PRIORITY - 2);
config.denyCacheImageMultipleSizesInMemory();
config.diskCacheFileNameGenerator(new Md5FileNameGenerator());
config.diskCacheSize(50 * 1024 * 1024); // 50 MiB
config.tasksProcessingOrder(QueueProcessingType.LIFO);
config.writeDebugLogs(); // Remove for release app
// Initialize ImageLoader with configuration.
ImageLoader.getInstance().init(config.build());
}
}
主要活动类:
package autogenie.dg10;
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.GridView;
import android.widget.Toast;
import com.nostra13.universalimageloader.cache.memory.impl.WeakMemoryCache;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import com.nostra13.universalimageloader.core.assist.ImageScaleType;
import com.nostra13.universalimageloader.core.display.FadeInBitmapDisplayer;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import java.util.Scanner;
public class MainActivity extends AppCompatActivity {
InputStream i;
String theString = "";
static List<String> list = new ArrayList<>();
Context mContext = this;
JSONArray k;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
try {
i = getAssets().open("swipperesponse.json");
} catch (IOException e) {
}
Scanner scanner = new Scanner(i, "UTF-8");
while (scanner.hasNext()) {
theString = theString + scanner.next();
}
try {
JSONObject js = new JSONObject(theString);
k = js.getJSONArray("swipe");
for (int i = 0; i < k.length(); i++) {
try {
JSONObject oneObject = k.getJSONObject(i);
// Pulling items from the array
// Toast.makeText(this,oneObject.getString("productImageURL"), Toast.LENGTH_LONG).show();
String d = oneObject.getString("productImageURL");
list.add(i, d);
int l = 0;
int u = 0;
} catch (JSONException e) {
// Oops
}
}
} catch (Exception e) {
e.printStackTrace();
}
pageradapter p = new pageradapter(this);
ViewPager mViewPager = (ViewPager) findViewById(R.id.view);
mViewPager.setAdapter(p);
}
}
我无法弄清楚出了什么问题。运行
app
时未报告任何错误。
img.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="wrap_content">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/imageView3"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:layout_marginTop="225dp" />
</LinearLayout>
的AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="autogenie.dg10">
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<application
android:name=".MyApplication"
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
mainactivity.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="autogenie.dg10.MainActivity">
<LinearLayout
android:weightSum="2"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="270dp"
android:id="@+id/linearLayout4"
android:layout_below="@+id/view"
android:layout_alignParentStart="true">
<LinearLayout
android:layout_weight="1"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="150dp"
android:layout_alignParentBottom="true"
android:weightSum="2"
android:id="@+id/linearLayout3"
android:layout_alignEnd="@+id/linearLayout2"
android:layout_alignParentStart="true"
android:layout_marginBottom="10dp">
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:id="@+id/imageView5"
android:background="@drawable/a"
android:layout_marginRight="10dp" />
<ImageView
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/imageView6"
android:layout_gravity="bottom"
android:background="@drawable/aa"
android:layout_marginLeft="10dp" />
</LinearLayout>
<LinearLayout
android:layout_weight="1"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="150dp"
android:weightSum="2"
android:layout_alignParentEnd="true"
android:id="@+id/linearLayout"
android:layout_alignParentStart="true"
android:layout_marginTop="10dp">
<ImageView
android:layout_weight="1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/imageView"
android:background="@drawable/aaa"
android:baselineAlignBottom="false"
android:layout_marginRight="10dp" />
<ImageView
android:layout_weight="1"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:id="@+id/imageView2"
android:layout_gravity="bottom"
android:background="@drawable/aaaa"
android:visibility="visible"
android:layout_marginLeft="10dp" />
</LinearLayout>
</LinearLayout>
<android.support.v4.view.ViewPager
android:layout_width="wrap_content"
android:layout_height="200dp"
android:id="@+id/view"
android:layout_centerHorizontal="true" />
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="20dp"
android:id="@+id/horizontalScrollView"
android:layout_alignParentBottom="true"
android:layout_alignParentStart="true"
android:layout_alignEnd="@+id/linearLayout4"
android:layout_below="@+id/linearLayout4" />
</RelativeLayout>
MY LOG CAT:
02-08 12:34:12.374 3560-3560 /? W / dalvikvm:VFY:无法找到课程 在签名中引用(Landroid / view / SearchEvent;)02-08 12:34:12.374 3560-3560 /? I / dalvikvm:找不到方法 android.view.Window $ Callback.onSearchRequested,从方法引用 android.support.v7.view.WindowCallbackWrapper.onSearchRequested 02-08 12:34:12.374 3560-3560 /? W / dalvikvm:VFY:无法解析界面 方法16217:Landroid / view / Window $ Callback; .onSearchRequested (Landroid / view / SearchEvent;)Z 02-08 12:34:12.374 3560-3560 /? I / dalvikvm:找不到方法 android.view.Window $ Callback.onWindowStartingActionMode,引用 从方法 android.support.v7.view.WindowCallbackWrapper.onWindowStartingActionMode 02-08 12:34:12.374 3560-3560 /? W / dalvikvm:VFY:无法解决 接口方法16221: Landroid /视图/窗口$回调; .onWindowStartingActionMode (Landroid /视图/ ActionMode $回调; I)Landroid /视图/ ActionMode; 02-08 12:34:12.378 3560-3560 /? I / dalvikvm:找不到方法 android.content.res.TypedArray.getChangingConfigurations,引用 从方法 android.support.v7.widget.TintTypedArray.getChangingConfigurations 02-08 12:34:12.378 3560-3560 /? W / dalvikvm:VFY:无法解决 虚方法414: Landroid / content / res / TypedArray; .getChangingConfigurations()I 02-08 12:34:12.382 3560-3560 /? I / dalvikvm:找不到方法 android.content.res.TypedArray.getType,从方法引用 android.support.v7.widget.TintTypedArray.getType 02-08 12:34:12.382 3560-3560 /? W / dalvikvm:VFY:无法解析虚方法436: Landroid / content / res / TypedArray; .getType(I)I 02-08 12:34:12.394 3560-3560 /? I / dalvikvm-heap:将堆(frag case)增长到3.753MB for 1125052字节分配02-08 12:34:12.414 3560-3560 /? I / dalvikvm-heap:将堆(frag case)增长到8.041MB,用于4500172字节 分配02-08 12:34:12.458 3560-3560 /? I / dalvikvm-heap:增长堆 (frag case)为12:3434MB,用于4500172字节分配02-08 12:34:12.494 3560-3560 /? I / dalvikvm-heap:将堆(frag case)增长到16.627MB 4500172字节分配02-08 12:34:12.538 3560-3560 /? I / dalvikvm-heap:将堆(frag case)增长到20.920MB,用于4500172字节 分配02-08 12:34:12.582 3560-3560 /? E / libEGL:调用OpenGL ES 没有当前上下文的API(每个线程记录一次)02-08 12:34:12.626 3560-3560 /? W / EGL_genymotion:eglSurfaceAttrib没有 实施
答案 0 :(得分:0)
为什么你两次打电话给ImageLoader.init()
。
从instantiateItem
方法
mImageLoader.init(ImageLoaderConfiguration.createDefault(mContext));
你试图加载的图像不存在
http://www.airtel.in/4g/images/airtel_4g_hotspot_responsive.jpg
此路径显示403错误