android在线浏览图片

MainActivity.java

package com.example.internetimageview;

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.URL;

import android.app.Activity;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Bundle;

import android.os.Handler;

import android.os.Looper;

import android.os.Message;

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;

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;

default:

break;

}

};

};

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

initViews();

}

private void initViews() {

etImageUrl=(EditText) findViewById(R.id.etImageUrl);

ivImage=(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 viewImage(View view){

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

if(TextUtils.isEmpty(imageUrl)){

Toast.makeText(getApplicationContext(),"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{

Looper.prepare();

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

Looper.loop();

}

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

}.start();

}

}

}

activity-main.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://www.2cto.com/uploadfile/Collfiles/20141201/2014120109192831.png" />

<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="浏览" />

</LinearLayout>