#7 #492 提交实验77代码

students/soft1714080902129/app/src/main/AndroidManifest.xml

@@ -20,11 +20,21 @@
                 <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <provider
+            android:authorities="edu.hzuapps.androidlabs.soft1714080902129.electricitypaymentsystem.fileProvider666"
+            android:name="android.support.v4.content.FileProvider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/file_paths" />
+        </provider>
     </application>
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
     <uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
     <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
 </manifest>

students/soft1714080902129/app/src/main/java/edu/hzuapps/androidlabs/soft1714080902129/electricitypaymentsystem/Soft1714080902129Activity.java

@@ -4,24 +4,31 @@
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 import android.graphics.drawable.BitmapDrawable;
+import android.net.Uri;
 import android.os.Build;
 import android.os.Handler;
 import android.os.Message;
+import android.provider.MediaStore;
+import android.support.annotation.Nullable;
 import android.support.annotation.RequiresApi;
+import android.support.v4.content.FileProvider;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.Button;
 import android.widget.CalendarView;
 import android.widget.LinearLayout;
 
+import java.io.File;
+import java.io.IOException;
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
 
 
 public class Soft1714080902129Activity extends AppCompatActivity {
-
+    public static final int TAKE_PHOTO = 1;
+    private Uri imageUri;
     private LinearLayout bg;
     private Button button;
     private String url = "https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1557248715893&di=e64b82e55e4f27b1712bab3afc0825be&imgtype=0&src=http%3A%2F%2Fwww.51pptmoban.com%2Fd%2Ffile%2F2012%2F11%2F01%2Fa1f289fb0f6233b02486d2fba8c6f1da.jpg";
@@ -69,7 +76,54 @@ public void run() {
                 }).start();
             }
         });
+        Button takePhoto = findViewById(R.id.take_photo);
+        takePhoto.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                //创建File对象，用户存储拍照后的图片
+                File output = new File(getExternalCacheDir(),"output_image.jpg");
+                try{
+                    if(output.exists()) {
+                        output.delete();
+                    }
+                    output.createNewFile();
+                }catch(IOException e){
+                    e.printStackTrace();
+                }
+                if(Build.VERSION.SDK_INT >= 24){
+                    imageUri = FileProvider.getUriForFile(Soft1714080902129Activity.this,
+                            "edu.hzuapps.androidlabs.soft1714080902129.electricitypaymentsystem.fileProvider666",output);
+                }
+                else{
+                    imageUri = Uri.fromFile(output);
+                }
+                //启动相机程序
+                Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
+                intent.putExtra(MediaStore.EXTRA_OUTPUT,imageUri);
+                startActivityForResult(intent,TAKE_PHOTO);
+            }
+        });
     }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
+        switch(requestCode){
+            case TAKE_PHOTO:
+                if(resultCode == RESULT_OK){
+                    try{
+                        Bitmap bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(imageUri));
+                        bg.setBackground(new BitmapDrawable(bitmap));
+
+                    }catch (IOException e){
+                        e.printStackTrace();
+                    }
+                }
+                break;
+            default:
+                break;
+        }
+    }
+
     //从网络下载图片
     private Bitmap getImage(String url_image) {
         Bitmap bmp = null;

students/soft1714080902129/app/src/main/res/layout/activity_soft1714080902129.xml

@@ -26,4 +26,9 @@
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="更换背景" />
+    <Button
+        android:id="@+id/take_photo"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="拍照"/>
 </LinearLayout>

students/soft1714080902129/app/src/main/res/xml/file_paths.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<paths xmlns:android="http://schemas.android.com/apk/res/android">
+    <external-path name="my_images" path=""/>
+</paths>