联网显示图片

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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;            }        };    };@Overrideprotected 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);}@Overridepublic 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();        }    }}

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