联网查看图片

在AndroidMainfest中注册Activity运行

1.activity.xml

<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"

    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=".MainActivity" >

 

    <ImageView

        android:id="@+id/ivImage"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:layout_weight="1" />

 

    <EditText

        android:id="@+id/etImageUrl"

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:ems="10"

        android:hint="请输入图片的地址"

        android:text="http://epaper.yangtse.com/images/2010-06/24/A39/YZA39624C005_b.jpg" />

 

    <Button

        android:id="@+id/btnView"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_gravity="center"

        android:onClick="viewImage"

        android:text="浏览" />

 

</LinearLayout>

 

 

 

2.MainActivity.java

package com.example.xianshitupian;

 

 

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

 

 

 

 

import android.os.Bundle;

import android.os.Handler;

import android.os.Message;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.text.TextUtils;

import android.view.Menu;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.ImageView;

import android.widget.Toast;

 

 

public class MainActivity extends Activity {

private ImageView xstp;

private EditText xdz;

private Button liulan;

    public static final int SHOWIMAGE=1;

    public static final int SHOWFAIL=0;

private Handler handler=new Handler(){

        public void handleMessage(android.os.Message msg) {

            switch (msg.what) {

            case SHOWIMAGE:

                Bitmap bitmap=(Bitmap) msg.obj;

                xstp.setImageBitmap(bitmap);

                break;

 

 

            case SHOWFAIL:

             xstp.setImageResource(R.drawable.button_bg);

                Toast.makeText(MainActivity.this, "显示图片失败", Toast.LENGTH_LONG).show();

                break;

 

 

            default:

                break;

            }

        };

    };

 

 

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

xstp=(ImageView) findViewById(R.id.ivImage);

xdz=(EditText) findViewById(R.id.etdizhi);

xstp.setImageResource(R.drawable.button_bg);

}

 

 

@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;

}

    public void star(View view){

        final String imageUrl=xdz.getText().toString();

        if(TextUtils.isEmpty(imageUrl)){

            Toast.makeText(this, "图片路径不能为空", Toast.LENGTH_LONG).show();

        }else{

            new Thread(){

                    public void run() {

                        try {

                            URL url=new URL(imageUrl);

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

                            httpURLConnection.setRequestMethod("GET");

                            httpURLConnection.setConnectTimeout(5000);

                            int responseCode=httpURLConnection.getResponseCode();

                            if(responseCode==200){

                                InputStream inputStream=httpURLConnection.getInputStream();

                                Bitmap bitmap=BitmapFactory.decodeStream(inputStream);

                                Message message=new Message();

                                message.what=SHOWIMAGE;

                                message.obj=bitmap;

                                //ivImage.setImageBitmap(bitmap);

                                handler.sendMessage(message);

                            }else{

                                Message message=new Message();

                                message.what=SHOWFAIL;

                                handler.sendMessage(message);

                            }

                        } catch (MalformedURLException e) {

                            e.printStackTrace();

                        } catch (IOException e) {

                            e.printStackTrace();

                        }

                }

            }.start();

        }

    }

}