畢加索庫不從URL

Question

我使用Picasso Library告訴我的形象，但Picasso.with(this).load(url).into(iv);
我沒有發現任何圖像在我看來......

MainActivity.java

package com.example.gallery; 

import android.support.v7.app.ActionBarActivity; 
import android.support.v7.app.ActionBar; 
import android.support.v4.app.Fragment; 
import android.os.Bundle; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ImageView; 
import android.widget.RelativeLayout; 
import android.os.Build; 

import com.squareup.picasso.Picasso; 


public class MainActivity extends ActionBarActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     ImageView iv = (ImageView) findViewById(R.id.imageView1); 
     String url="http://upload.wikimedia.org/wikipedia/commons/2/2a/Junonia_lemonias_DSF_upper_by_Kadavoor.JPG"; 
     Picasso.with(this).load(url).into(iv); 


     /* 
     * if (savedInstanceState == null) { 

      getSupportFragmentManager().beginTransaction() 
        .add(R.id.container, new PlaceholderFragment()) 
        .commit(); 

     }*/ 
    } 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 

     // Inflate the menu; this adds items to the action bar if it is present. 
     getMenuInflater().inflate(R.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(); 
     if (id == R.id.action_settings) { 
      return true; 
     } 
     return super.onOptionsItemSelected(item); 
    } 

    /** 
    * A placeholder fragment containing a simple view. 
    */ 
    public static class PlaceholderFragment extends Fragment { 

     public PlaceholderFragment() { 
     } 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) { 
      View rootView = inflater.inflate(R.layout.fragment_main, container, false); 


      return rootView; 
     } 
    } 

} 

和activity_main.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="fill_parent" 
android:layout_height="fill_parent" > 

<Button 
    android:id="@+id/button1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_marginTop="400dp" 
    android:layout_weight="0.52" 
    android:text="Button" /> 

<ImageView 
    android:id="@+id/imageView1" 
    android:layout_width="wrap_content" 
    android:layout_height="183dp" 
    android:layout_weight="2.89" 
    android:src="@drawable/abc_ab_solid_light_holo" /> 

我正確查看bUtton，但我沒有查看網址的圖像。

一些提示？感謝

Answer 1

使用此，如果有在獲得圖像的任何錯誤....在LinearLayout中

Picasso.with(context) 
    .load(url) 
    .placeholder(R.drawable.user_placeholder) 
    .error(R.drawable.user_placeholder_error) 
    .into(imageView); 

看跌方向。

Additional documentation on Picasso