接着处理《Android 网络图片查看器》中出现的问题使用添加子线程,修改原程序:package com.wuyudong.imagesviewer;import java.io.InputStream;import java.net.HttpURLConnection;impo ...
接着处理《Android 网络图片查看器》中出现的问题
使用添加子线程,修改原程序:
package com.wuyudong.imagesviewer;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import org.apache.http.HttpConnection;import android.os.Bundle;import android.app.Activity;import android.graphics.Bitmap;import android.graphics.BitmapFactory;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 et_path; private ImageView iv; @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", 0).show(); } else { new Thread() { @Override public void run() { // 连接服务器get请求获取图片 try { URL url = new URL(path); // 根据url发送http的请求 HttpURLConnection conn = (HttpURLConnection) url .openConnection(); // 设置请求的方式 conn.setRequestMethod("GET"); conn.setConnectTimeout(5000); conn.setReadTimeout(5000); conn.setRequestProperty( "User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.101 Safari/537.36"); int code = conn.getResponseCode(); if (code == 200) { InputStream is = conn.getInputStream(); Bitmap bitmap = BitmapFactory.decodeStream(is); iv.setImageBitmap(bitmap); } else { Toast.makeText(MainActivity.this, "显示图片失败", 0) .show(); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); Toast.makeText(MainActivity.this, "访问获取图片失败", 0).show(); } } }.start(); } }}
原标题:Android消息机制入门
关键词:Android
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