联网查看图片

联网查看图片的小程序。

如图

1.

package com.bzu.gxs;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.EditText;import android.widget.ImageView;import android.widget.Toast;public class MainActivity extends Activity {private EditText etImageUrl;private ImageView ivImage;public static final int SHOWIMAGE = 1;public static final int SHOWFAIL = 0;// Handler 处理事件private Handler handler = new Handler() {public void handleMessage(android.os.Message msg) {switch (msg.what) {case SHOWIMAGE:Bitmap bitmap = (Bitmap) msg.obj;ivImage.setImageBitmap(bitmap);break;case SHOWFAIL:ivImage.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);initViews();ivImage.setImageResource(R.drawable.button_bg);}// 查找的IDprivate void initViews() {etImageUrl = (EditText) findViewById(R.id.etImageUrl);ivImage = (ImageView) findViewById(R.id.ivImage);}// 按钮点击事件public void viewImage(View view) {final String imageUrl = etImageUrl.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();}}}

2.

<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="璇疯緭鍏ュ浘鐗囩殑鍦板潃"        android:text="http://avatar.csdn.net/C/9/A/1_yf210yf.jpg" />    <Button        android:id="@+id/btnView"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_gravity="center"        android:background="@drawable/button_bg"        android:onClick="viewImage"        android:text="娴忚" /></LinearLayout>