Question

我试图使用Picasso库，但它无法正常工作。我认为我的错误是Picasso.with(Context)我可能使用了错误的参数。我包含了MainActivity和ListClass的代码。图片未加载，并且不会在应用程序中显示为空格。

UPDATE !! ＆＃34;我错过了与错误无关。只是错误的副本。它给了我this

的错误

MainActivity;

import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.FragmentManager;
import android.widget.FrameLayout;
import android.widget.Button;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import android.app.Activity;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import com.squareup.picasso.Picasso;







public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener   {

    ListView list;
    imageHandler imagess = new imageHandler();

    String[] web = {"Trial "};
    Integer[] imageId = { R.drawable.ic_menu_camera };
    //Drawable[] imageId = { imagess.LoadImageFromWebOperations("http://egyptianstreets.com/wp-content/uploads/2016/08/satelliteegypt-400x240.jpg")};

    Handler handler;
    Button button;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();
        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
        listClass adapter = new
                listClass(MainActivity.this, web, imageId);
        list=(ListView)findViewById(R.id.list);
        list.setAdapter(adapter);

        list.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) {
                Toast.makeText(MainActivity.this, "You Clicked at " +web[+ position], Toast.LENGTH_SHORT).show();
            }
        });

    }

我使用Picasso库从URL加载图片的ListClass;

import android.app.Activity;
import android.graphics.drawable.Drawable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.webkit.WebView;
import com.squareup.picasso.Picasso;

public class listClass extends ArrayAdapter<String>{



    //Next three lines introduces Variables to use in the class
    private final Activity context;
    private final String[] web;
    private final Integer[] imageId;

    //Constructor to get Web, Image and context to set adapter
    public listClass(Activity context,  String[] web, Integer [] imageId) {

            super(context, R.layout.list, web);
            this.context = context;
            this.web = web;
            this.imageId = imageId;

    }

    //Public method to ...
    @Override
    public View getView(int position, View view, ViewGroup parent) {
        LayoutInflater inflater = context.getLayoutInflater();
        View rowView= inflater.inflate(R.layout.list, null, true);

        TextView txtTitle = (TextView) rowView.findViewById(R.id.txt);
        ImageView imageView = (ImageView) rowView.findViewById(R.id.img);
        txtTitle.setText(web[position]);
        Picasso.with(this).load("http://egyptianstreets.com/wp-content/uploads/2016/08/egyptischemoefti.jpg").resize(60,60).into(imageView").resize(50,50).centerCrop().
                into(imageView);
        return rowView;
    }
}

Answer 1

看起来你得到了＆＃34;错误。您的图片网址似乎已被错误复制。像＆＃39; resize（60,60）.into（imageView）＆＃39;是/不应该是图像的URL的一部分。他们可能偶然来了。

使用此

Picasso.with(this).load("http://egyptianstreets.com/wp-content/uploads/2016/08/egyptischemoefti.jpg").resize(60,60).centerCrop().into(imageView);

编辑：也许你给毕加索的背景是不对的。您需要为它在构造函数中初始化的活动上下文。

也许这个：

Picasso.with(this.context).load("http://egyptianstreets.com/wp-content/uploads/2016/08/egyptischemoefti.jpg").resize(60,60).centerCrop().into(imageView);

Answer 2

这里的错误是你以错误的方式使用库。

"在这里无效。

您还使用了.into(imageView)和resize(..)两次。

试试这个。

 Picasso.with(context).load("http://egyptianstreets.com/wp-content/uploads/2016/08/egyptischemoefti.jpg").resize(60,60).centerCrop().
            into(imageView);

毕加索错误加载图片？

2 个答案: