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最新推荐文章于 2023-11-10 00:14:41 发布

原创最新推荐文章于 2023-11-10 00:14:41 发布 · 212 阅读

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#Android

本文介绍了一个简单的Android应用程序，该程序能够从网络加载并显示图片。通过EditText输入图片URL，点击按钮后，应用会在ImageView中展示对应的图片。文章涵盖了如何使用多线程处理网络请求、解析HTTP响应以及将图片转换为Bitmap格式。

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MainActivity.java


package com.Texample.lltp;

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.Message;
import android.text.TextUtils;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {
	private EditText editText;
	private ImageView imageView;
	private static final int SHOW_IMAGE = 1;
	private Handler handler = new Handler() {
		public void handleMessage(android.os.Message msg) {
			switch (msg.what) {
			case SHOW_IMAGE:
				Bitmap bitmap = (Bitmap) msg.obj;
				imageView.setImageBitmap(bitmap);
				break;
			default:
				break;
			}
		};
	};

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		editText = (EditText) findViewById(R.id.editText);
		imageView = (ImageView) findViewById(R.id.imageView);
	}

	public void showImage(View view) {
		final String path = editText.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 httpURLConnection = (HttpURLConnection) url
								.openConnection();
						httpURLConnection.setRequestMethod("GET");
						httpURLConnection.setConnectTimeout(5000);
						int responsecode = httpURLConnection.getResponseCode();
						if (responsecode == 200) {
							InputStream is = httpURLConnection.getInputStream();
							Bitmap bitmap = BitmapFactory.decodeStream(is);
							Message msg = new Message();
							msg.what = SHOW_IMAGE;
							msg.obj = bitmap;
							handler.sendMessage(msg);
						}
					} catch (MalformedURLException e) {
						e.printStackTrace();
					} catch (IOException e) {
						e.printStackTrace();
					}
				};
			}.start();
		}
	}
}



acticity_main.xml


<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"
    tools:context=".MainActivity" >

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:layout_weight="1" />

    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:text="http://pica.nipic.com/2007-11-09/2007119124513598_2.jpg" />

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:onClick="showImage"
        android:text="@string/liu_lan" />

</LinearLayout>

AndroidManifest.xml



<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.Texample.lltp"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />
<uses-permission android:name="android.permission.INTERNET" />
    
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.Texample.lltp.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>