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>