Merge pull request #496 from FYJ1995/master

#6 #117 第六次作业

AndroidLabs/app/src/main/java/edu/hzuapps/androidlabs/homeworks/net1414080903203/Net1414080903203Network.java

@@ -0,0 +1,92 @@
+package edu.hzuapps.androidlabs.homeworks.net1414080903203;
+
+
+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.URL;
+
+import edu.hzuapps.androidlabs.R;
+
+/**
+ * Created by Administrator on 2017/6/20 0020.
+ */
+
+public class Net1414080903203Network extends Activity {
+    protected static final int CHANGE_UI=1;
+    protected static final int ERROR=2;
+    private EditText et_path;
+    private ImageView iv;
+    //主线线程创建信息处理器
+    private Handler handler=new Handler(){
+        public void handlerMessage(android.os.Message msg){
+            if(msg.what==CHANGE_UI){
+                Bitmap bitmap=(Bitmap) msg.obj;
+                iv.setImageBitmap(bitmap);
+            }else if(msg.what==ERROR){
+                Toast.makeText(Net1414080903203Network.this,
+                        "显示图片错误",Toast.LENGTH_SHORT).show();
+            }
+        };
+    };
+    protected void onCreate(Bundle saveInstaneState){
+        super.onCreate(saveInstaneState);
+        setContentView(R.layout.activity_net1414080903203network);
+        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，Anroid4.0以后不能放在主线程
+            new Thread(){
+                private HttpURLConnection conn;
+                private Bitmap bitmap;
+                public void run(){
+                    //链接服务器get请求，获取图片
+                    try{
+                        URL url=new URL(path);
+                        conn=(HttpURLConnection) url.openConnection();
+                        conn.setRequestMethod("GET");
+                        conn.setConnectTimeout(5000);
+                        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)");
+                        int code=conn.getResponseCode();
+                        if(code==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 (Exception e){
+                        e.printStackTrace();
+                        Message msg=new Message();
+                        msg.what=ERROR;
+                        handler.sendMessage(msg);
+                    }
+                };
+
+            }.start();
+        }
+    }
+
+}

AndroidLabs/app/src/main/res/layout/activity_net1414080903203network.xml

@@ -0,0 +1,24 @@
+<?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:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    tools:context=".homeworks.net1414080903203.Net1414080903203Network">
+    <ImageView
+        android:layout_weight="1000"
+        android:id="@+id/iv"
+        android:layout_width="fill_parent"
+        android:layout_height="fill_parent"/>
+    <EditText
+        android:singleLine="true"
+        android:id="@+id/et_path"
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:hint="请输入图片路径"/>
+    <Button
+        android:onClick="click"
+        android:layout_width="fill_parent"
+        android:layout_height="wrap_content"
+        android:text="浏览"/>
+</LinearLayout>