ImageBrowser

1.效果图



2.代码

2.1MainActivity
package com.example.imagebrowser;

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.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;

public class MainActivity extends Activity
{
private EditText et_path;
private ImageView iv;
private Button bt;
private Handler handler=new Handler(){
public void handleMessage(android.os.Message msg){
Bitmap bitmap=(Bitmap) msg.obj;
iv.setImageBitmap(bitmap);
};
};
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_path=(EditText)findViewById(R.id.et_path);
iv=(ImageView)findViewById(R.id.iv);
bt=(Button) findViewById(R.id.button1);
}
public void click(View v){
new Thread(){public void run(){
try
{
String path=et_path.getText().toString().trim();
URL url=new URL(path);
HttpURLConnection conn=(HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
int code=conn.getResponseCode();
if(code==200){
InputStream in=conn.getInputStream();
Bitmap bitmap=BitmapFactory.decodeStream(in);
Message msg=Message.obtain();
msg.obj=bitmap;
handler.sendMessage(msg);

}
} catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
};}.start();

}
@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;
}

}
2.2 activity_main

<RelativeLayout 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"
tools:context=".MainActivity" >

<EditText
android:id="@+id/et_path"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/button1"
android:layout_centerHorizontal="true"
android:layout_marginBottom="48dp"
android:ems="10"
android:text="https://img.alicdn.com/tps/TB1eREfLVXXXXaHXFXXXXXXXXXX-480-260.png"
android:hint="请输入图片的网址">

<requestFocus />
</EditText>

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:onClick="click"
android:layout_marginBottom="46dp"
android:text="浏览" />

<ImageView
android:id="@+id/iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>

</RelativeLayout>

2.3增加权限
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.INTERNET"/>