网页图片查看器

MainActivity.java

package com.example.androidwebpicture;

import Java.io.IOException;
import java.io.InputStream;
import java.NET.HttpURLConnection;
import java.Net.MalformedURLException;
import java.net.URL;

import javax.crypto.spec.IvParameterSpec;

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 etUrl;
private ImageView ivImageShow;
private static final int SHOWIMAGE=1;
private Handler handler=new Handler(){
public void handleMessage(android.os.Message msg) {
switch (msg.what) {
case SHOWIMAGE:
Bitmap bitmap=(Bitmap) msg.obj;
ivImageShow.setImageBitmap(bitmap);

break;

default:
break;
}
};
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initViews();
}

private void initViews() {
etUrl=(EditText) findViewById(R.id.etImageUrl);
ivImageShow=(ImageView) findViewById(R.id.ivImage);
}

@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 showImage(View view){
final String path=etUrl.getText().toString();
if(TextUtils.isEmpty(path)){
Toast.makeText(this, "图片不能为空", Toast.LENGTH_LONG).show();
}else{
new Thread(){
public void run(){
try {
URL url=new URL(path);
HttpURLConnection connection=(HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(5000);
int responseCode=connection.getResponseCode();
if(responseCode==200){
InputStream inputStream=connection.getInputStream();
Bitmap bitmap=BitmapFactory.decodeStream(inputStream);
//ivImageShow.setImageBitmap(bitmap);
Message message=new Message();
message.what=SHOWIMAGE;
message.obj=bitmap;
handler.sendMessage(message);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
};
}.start();
}
}
}

页面布局代码：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
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:text="http://imgsrc.baidu.com/forum/w%3D580/sign=60880cfd0cf41bd5da53e8fc61db81a0/396a7301213fb80e667a8a0134d12f2ebb3894c4.jpg"
/>

<Button
android:id="@+id/btnView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:onClick="showImage"
android:text="浏览" />
</LinearLayout>