Merge pull request #2619 from Im-a-programmer/master

#6 #1439  第六次实验及报告

com1614080901140/app/src/main/AndroidManifest.xml

@@ -1,21 +1,31 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.example.com1614080901140">
+    package="edu.hzuapps.androidlabs.com1614080901140">
 
+
+    <uses-permission android:name="android.permission.INTERNET" />
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name="edu.hzuapps.andriodlabs.com1614080901140.Com1614080901140Activity">
+        <activity android:name=".Com1614080901140Activity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
 
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
-        <activity android:name="edu.hzuapps.andriodlabs.com1614080901140.SecondActivity"></activity>
+        <activity
+            android:name=".SecondActivity"
+            android:label="@string/title_activity_second"
+            android:theme="@style/AppTheme.NoActionBar" />
+        <activity
+            android:name=".ThirdActivity"
+            android:label="@string/title_activity_third"
+            android:theme="@style/AppTheme.NoActionBar"></activity>
     </application>
 
 </manifest>

com1614080901140/app/src/main/java/edu/hzuapps/androidlabs/Com1614080901140/SecondActivity.java

@@ -16,11 +16,12 @@
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStreamWriter;
-
+import android.content.Intent;
 import android.widget.Toast;
 
 public class SecondActivity extends AppCompatActivity {
 
+    private Button nextbtn;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -43,7 +44,14 @@ public void onClick(View v) {
                         readsy5();
                     }
                 });
-
+        nextbtn=(Button)findViewById(R.id.btn_t);
+        nextbtn.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View view) {
+                Intent intent=new Intent(SecondActivity.this,ThirdActivity.class);
+                startActivity(intent);
+            }
+        });
 
     }
 

com1614080901140/app/src/main/java/edu/hzuapps/androidlabs/Com1614080901140/ThirdActivity.java

@@ -0,0 +1,115 @@
+package edu.hzuapps.androidlabs.com1614080901140;
+
+import android.support.v7.app.AppCompatActivity;
+import android.os.Bundle;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.InputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import android.os.AsyncTask;
+import android.os.Environment;
+import android.os.Handler;
+import android.os.Message;
+import android.app.Activity;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.Button;
+import android.widget.ImageView;
+import android.widget.Toast;
+
+
+public class ThirdActivity extends AppCompatActivity  implements OnClickListener{
+
+    Button content;
+    ImageView image;
+    Bitmap bitmap;
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_third);
+        content=(Button)findViewById(R.id.content);
+        image=(ImageView)findViewById(R.id.image);
+
+        content.setOnClickListener(this);;
+        image.setOnClickListener(this);;
+    }
+
+    public Bitmap GetImageInputStream(String imageurl){
+        URL url;
+        HttpURLConnection connection=null;
+        Bitmap bitmap=null;
+        try {
+            url = new URL(imageurl);
+            connection=(HttpURLConnection)url.openConnection();
+            connection.setConnectTimeout(6000);
+            connection.setDoInput(true);
+            connection.setUseCaches(false);
+            InputStream inputStream=connection.getInputStream();
+            bitmap=BitmapFactory.decodeStream(inputStream);
+            inputStream.close();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return bitmap;
+    }
+
+    public void onClick(View v) {
+        switch (v.getId()) {
+            case R.id.content:
+
+                new Task().execute("http://img.szhome.com/images/sznews/2012/07/20120703105442315.JPG");
+                break;
+
+            case R.id.image:
+
+                SavaImage(bitmap, Environment.getExternalStorageDirectory().getPath()+"/Test");
+                Toast.makeText(getBaseContext(), "图片保存", Toast.LENGTH_SHORT).show();
+                break;
+
+            default:
+                break;
+        }
+    }
+
+    Handler handler=new Handler(){
+        public void handleMessage(android.os.Message msg) {
+            if(msg.what==0x123){
+                image.setImageBitmap(bitmap);
+            }
+        };
+    };
+
+
+    class Task extends AsyncTask<String, Integer, Void>{
+
+        protected Void doInBackground(String... params) {
+            bitmap=GetImageInputStream((String)params[0]);
+            return null;
+        }
+
+        protected void onPostExecute(Void result) {
+            super.onPostExecute(result);
+            Message message=new Message();
+            message.what=0x123;
+            handler.sendMessage(message);
+        }
+
+    }
+
+    public void SavaImage(Bitmap bitmap, String path){
+        File file=new File(path);
+        FileOutputStream fileOutputStream=null;
+        if(!file.exists()){
+            file.mkdir();
+        }
+        try {
+            fileOutputStream=new FileOutputStream(path+"/"+System.currentTimeMillis()+".png");
+            bitmap.compress(Bitmap.CompressFormat.JPEG, 100,fileOutputStream);
+            fileOutputStream.close();
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+}

com1614080901140/app/src/main/res/layout/activity_second.xml

@@ -49,4 +49,16 @@
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintTop_toTopOf="parent"
         app:layout_constraintVertical_bias="0.134" />
+
+    <Button
+        android:id="@+id/btn_t"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentBottom="true"
+        android:layout_alignParentEnd="true"
+        android:layout_alignParentRight="true"
+        android:layout_marginBottom="17dp"
+        android:layout_marginEnd="30dp"
+        android:layout_marginRight="30dp"
+        android:text="铁路路线"/>
 </RelativeLayout>

com1614080901140/app/src/main/res/layout/activity_third.xml

@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout 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"
+        tools:context="edu.hzuapps.androidlabs.com1614080901140.ThirdActivity"
+        android:orientation="vertical"
+        >
+
+    <ImageView
+        android:id="@+id/image"
+        android:layout_width="fill_parent"
+        android:layout_height="450dp"
+        android:layout_alignParentLeft="true"
+        android:layout_alignParentStart="true"
+        android:layout_alignParentTop="true"
+        android:layout_marginTop="22dp" />
+
+    <Button
+        android:id="@+id/content"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_alignParentBottom="true"
+        android:layout_alignParentEnd="true"
+        android:layout_alignParentRight="true"
+        android:layout_marginBottom="20dp"
+        android:layout_marginEnd="68dp"
+        android:layout_marginRight="68dp"
+        android:background="#ff8c00"
+        android:text="路线查看" />
+
+</RelativeLayout>
+

com1614080901140/report6.md

@@ -0,0 +1,25 @@
+实验六
+
+一.实验目的  
+掌握Android网络访问方法；  
+
+二.实验内容  
+从网络下载一个文件（图片、MP3、MP4）；  
+保存到手机，在应用中使用文件；  
+将应用运行结果截图;  
+
+三.实验步骤  
+1.修改AndroidManifest.xml文件，获取连接网络的权限；  
+2.重新建立一个activity文件，在相应的xml文件中加入button,点击就会下载相应的图片；  
+3.实现图片的下载  
+
+四.实验截图  
+![screen](https://github.com/Im-a-programmer/android-labs-2018/blob/master/com1614080901140/6.2.png)
+![screen](https://github.com/Im-a-programmer/android-labs-2018/blob/master/com1614080901140/6.1.png)
+![screen](https://github.com/Im-a-programmer/android-labs-2018/blob/master/com1614080901140/6.0.png)
+
+
+五.实验体会  
+    这次实验的难点在于设置app访问网络的权限以及下载图片的功能实现，刚开始时输入几个图片链接发现在apk文件上都下载不下来还以为是代码出错，
+后来再重试几次发现是图片问题，有的图片能下载成功，有一些则不能，虽然现在还搞不懂是什么原因造成的，但在以后的自主学习中我相信这些问题都会被解决的。
+