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Android实现网页图片浏览功能

2017-05-23 17:12 597 查看

本文实例为大家分享了AndAndroid实现网页图片浏览的具体代码,供大家参考,具体内容如下

基本功能:输入图片的url然后点击按钮加载出来图片

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="cn.edu.bzu.imageview.MainActivity">
<ImageView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/iv"
android:layout_weight="1000"
/>
<EditText
android:id="@+id/et_path"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请输入图片的路径"
android:text="http://pic.58pic.com/58pic/16/62/63/97m58PICyWM_1024.jpg"
android:singleLine="true" />
<Button
android:text="浏览"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:onClick="click"/>
</LinearLayout>

MainActivity:

package cn.edu.bzu.imageview;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class MainActivity extends Activity {
protected static final int CHANGE_UI = 1;
protected static final int ERROR = 2;
private EditText et_path;
private ImageView iv;
private Handler handler = new Handler() {
public void handleMessage(Message msg) {
if (msg.what == CHANGE_UI) {
Bitmap bitmap = (Bitmap) msg.obj;
iv.setImageBitmap(bitmap);
} else if (msg.what == ERROR) {
Toast.makeText(MainActivity.this, "显示图片错误",Toast.LENGTH_SHORT).show();
}
}
;
};
@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);
}
public void click(View view) {
final String path = et_path.getText().toString().trim();
if (TextUtils.isEmpty(path)) {
Toast.makeText(this, "图片路径不能为空", Toast.LENGTH_SHORT).show();
} else {
//子线程请求网络,android4.0以后访问网络不能放在主线程中
new Thread() {
private HttpURLConnection conn;
private Bitmap bitmap;
public void run() {//连接服务器get请求,获取图片
//创建URL对象
try {
URL url = new URL(path);
conn = (HttpURLConnection) url.openConnection();//根据url发送http的请求
conn.setRequestMethod("GET");//设置请求的方式
conn.setConnectTimeout(5000);//设置超时时间
conn.setRequestProperty("User-Agent", "Mozilla/4.0(compatible;MSIE 6.0;Windows NT 5.1;" + "SV1;.NET4.0C;.NET4.0E;.NET CLR 2.0.50727;" + ".NET CLR 3.0.4506.2152;.NET CLR 3.5.30729;Shuame)");//设置浏览器的版本
int code = conn.getResponseCode();//得到服务器返回的响应码
if (code == 200) {//请求成功后返回码是200
InputStream is = conn.getInputStream();
bitmap = BitmapFactory.decodeStream(is);
Message msg = new Message();
msg.what = CHANGE_UI;
msg.obj = bitmap;
handler.sendMessage(msg);
} else {
Message msg = new Message();
msg.what = ERROR;
handler.sendMessage(msg);
}
} catch (java.io.IOException e) {
e.printStackTrace();
Message msg = new Message();
msg.what = ERROR;
handler.sendMessage(msg);
}
}
}.start();
}
}

 这样基本功能就能实现了。

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。

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标签:  Android 图片浏览
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