package xidian.dy.com.chujia;

import android.os.Bundle;

import android.support.v7.app.AppCompatActivity;

import android.view.View;

import android.widget.Button;

import com.loopj.android.image.SmartImageView;

public class MainActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        Button btn = (Button) findViewById(R.id.btn);

        if(btn != null)

            btn.setOnClickListener(new MyLister());

    }

    class MyLister implements View.OnClickListener{

        @Override

        public void onClick(View v) {

            String url = "http://192.168.0.109/dog.jpg";

            SmartImageView siv = (SmartImageView) findViewById(R.id.img);

            if(siv != null)

                siv.setImageUrl(url);

        }

    }

}

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout 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:orientation="vertical"

    tools:context="xidian.dy.com.chujia.MainActivity">

        <Button

           android:id="@+id/btn"

           android:layout_width="wrap_content"

           android:layout_height="wrap_content"

           android:text="@string/delete"

           />

        <com.loopj.android.image.SmartImageView

            android:id="@+id/img"

            android:layout_width="100dp"

            android:layout_height="100dp"

            android:src="@drawable/dog1"

            />

</LinearLayout>