package mydemo.mycom.demo2;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.text.TextUtils;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ImageView;

import android.widget.Toast;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

public class ImagePrev extends ActionBarActivity implements View.OnClickListener {

    private ImageView iv;

    private Button btn_prev_image;

    private EditText et_image_path;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_image_prev);

        iv = (ImageView)findViewById(R.id.iv);

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

        et_image_path = (EditText)findViewById(R.id.et_image_path);

        btn_prev_image.setOnClickListener(this);

    }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        getMenuInflater().inflate(R.menu.menu_image_prev, menu);

        return true;

    }

    @Override

    public boolean onOptionsItemSelected(MenuItem item) {

        int id = item.getItemId();

        if (id == R.id.action_settings) {

            return true;

        }

        return super.onOptionsItemSelected(item);

    }

    @Override

    public void onClick(View view) {

        switch (view.getId())

        {

            case R.id.btn_prev_image:

                String path = et_image_path.getText().toString().trim();

                if(TextUtils.isEmpty(path))

                {

                    Toast.makeText(this,"图片路径不能",Toast.LENGTH_SHORT).show();

                    return;

                }

                try

                {

                    //浏览图片

                    URL url  = new URL(path);

                    HttpURLConnection conn = (HttpURLConnection)url.openConnection();

                    conn.setRequestMethod("GET");

                    conn.setConnectTimeout(5000);

                    int code = conn.getResponseCode();

                    if(code==200)

                    {

                        InputStream is = conn.getInputStream();

                        Bitmap bitmap = BitmapFactory.decodeStream(is);

                        iv.setImageBitmap(bitmap);

                    }

                    else

                    {

                        Toast.makeText(this,"图片浏览失败",Toast.LENGTH_SHORT).show();

                    }

                }catch (Exception e)

                {

                    Toast.makeText(this,"图片浏览失败",Toast.LENGTH_SHORT).show();

                    e.printStackTrace();

                }

                break;

        }

    }

}

<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:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:orientation="vertical"

    tools:context="mydemo.mycom.demo2.ImagePrev">

    <ImageView

        android:layout_weight="1000"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        android:id="@+id/iv"/>

    <EditText

        android:text="http://192.168.1.1:91/Resource/TopicInfo/2015-05-23/130768288778069472.png"

        android:hint="图片路径"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:id="@+id/et_image_path"/>

    <Button

        android:text="浏览"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:id="@+id/btn_prev_image"/>

</LinearLayout>