hzuapps#7 hzuapps#464 第7次实验

students/com1714080901133/app/src/main/java/edu/hzuapps/androidlabs/com1714080901133/Com1714080901133Activity.java

@@ -1,79 +1,192 @@
 package edu.hzuapps.androidlabs.com1714080901133;
-
+import android.annotation.TargetApi;
+import android.content.ContentUris;
+import android.content.Intent;
+import android.database.Cursor;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
-import android.os.Handler;
-import android.os.Message;
+import android.net.Uri;
+import android.os.Build;
+import android.os.Environment;
+import android.os.StrictMode;
+import android.provider.DocumentsContract;
+import android.provider.MediaStore;
+import android.support.annotation.RequiresApi;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.View;
+import android.widget.Button;
 import android.widget.ImageView;
+import android.widget.Toast;
 
-import java.io.InputStream;
-import java.net.HttpURLConnection;
-import java.net.URL;
-
-public class Com1714080901133Activity extends AppCompatActivity {
-
-    private  String imageUrl = "http://img.mp.itc.cn/upload/20170628/b0dabda375494e078340073efc4156c4_th.jpg";
-    private ImageView img;
-    private Handler handle = new Handler() {
-        public void handleMessage(Message msg) {
-            switch (msg.what) {
-                case 0:
-                    Bitmap bmp=(Bitmap)msg.obj;
-                    img.setImageBitmap(bmp);
-                    break;
-            }
-        };
-    };
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+public class  Com1714080901133Activity extends AppCompatActivity {
+
+    public static final int TAKE_PHOTO = 1;
+    public static final int CROP_PHOTO = 2;
+    public static final int CHOOSE_PHOTO = 3;
+    private Button takephoto;
+    private Button choosephoto;
+    private ImageView picture;
+    private Uri imageUri;
 
+    @RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR2)
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
+        StrictMode.setVmPolicy(builder.build());
+        builder.detectFileUriExposure();
         setContentView(R.layout.com_1714080901133_activity);
+        takephoto = (Button) findViewById(R.id.take_photo);
+        picture = (ImageView) findViewById(R.id.picture);
+        choosephoto = (Button) findViewById(R.id.choose_photo);
+
+        takephoto.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
 
+                File outputImage = new File(Environment.getExternalStorageDirectory(),
+                        "output_image.jpg");
 
-        ImageView jmp = findViewById(R.id.hzu);
-         {
+                try {
+                    if (outputImage.exists()) {
+                        outputImage.delete();
+                    }
+                    outputImage.createNewFile();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+
+                imageUri = Uri.fromFile(outputImage);
+
+                Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
+                intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
+
+                startActivityForResult(intent, TAKE_PHOTO);
+            }
+        });
 
-        img = (ImageView) findViewById(R.id.img);
-        img.setOnClickListener(new View.OnClickListener() {
+        choosephoto.setOnClickListener(new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                new Thread(new Runnable() {
-
-                    @Override
-                    public void run() {
-                        Bitmap bmp = getURLimage(imageUrl);
-                        Message msg = new Message();
-                        msg.what = 0;
-                        msg.obj = bmp;
-                        handle.sendMessage(msg);
-                    }
-                }).start();
+                Intent intent = new Intent("android.intent.action.GET_CONTENT");
+                intent.setType("image/*");
+
+                startActivityForResult(intent, CHOOSE_PHOTO);
             }
         });
-    }}
-
-    private Bitmap getURLimage(String imageUrl) {
-        Bitmap bmp = null;
-        try {
-            URL myurl = new URL(imageUrl);
-            HttpURLConnection conn = (HttpURLConnection) myurl.openConnection();
-            conn.setConnectTimeout(6000);
-            conn.setDoInput(true);
-            conn.setUseCaches(false);
-            conn.connect();
-            InputStream is = conn.getInputStream();
-            bmp = BitmapFactory.decodeStream(is);
-            is.close();
-        } catch (Exception e) {
-            e.printStackTrace();
+    }
+
+    @Override
+    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
+        switch (requestCode) {
+
+            case TAKE_PHOTO:
+                if (resultCode == RESULT_OK) {
+                    Intent intent = new Intent("com.android.camera.action.CROP");
+                    intent.setDataAndType(imageUri, "image/*");
+                    intent.putExtra("scale", true);
+                    intent.putExtra(MediaStore.EXTRA_OUTPUT, imageUri);
+
+                    startActivityForResult(intent, CROP_PHOTO);
+                }
+                break;
+
+            case CROP_PHOTO:
+                if (resultCode == RESULT_OK) {
+                    try {
+                        Bitmap bitmap = BitmapFactory.decodeStream(
+                                getContentResolver().openInputStream(imageUri));
+                        picture.setImageBitmap(bitmap);
+                    } catch (FileNotFoundException e) {
+                        e.printStackTrace();
+                    }
+                }
+                break;
+
+            case CHOOSE_PHOTO:
+                if (resultCode == RESULT_OK) {
+                    if (Build.VERSION.SDK_INT >= 19) {
+
+                        handleImageOnKitKat(data);
+                    } else {
+
+                        handleImageBeforeKitKat(data);
+                    }
+                }
+                break;
+            default:
+                break;
         }
-        return bmp;
+    }
+
+
+    @TargetApi(19)
+    private void handleImageOnKitKat(Intent data) {
+        String imagePath = null;
+
+        Uri uri = data.getData();
+
+        if (DocumentsContract.isDocumentUri(this, uri)) {
+            String docId = DocumentsContract.getDocumentId(uri);
+
+            if ("com.android.providers.media.documents".equals(
+                    uri.getAuthority())) {
+                String id = docId.split(":")[1];
+                String selection = MediaStore.Images.Media._ID + "=" + id;
 
+                imagePath = getImagePath(
+                        MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection);
+            } else if ("com.android.providers.downloads.documents".equals(
+                    uri.getAuthority())) {
+
+                Uri contentUri = ContentUris.withAppendedId(
+                        Uri.parse("content://downloads/public_downloads"),
+                        Long.valueOf(docId));
+                imagePath = getImagePath(contentUri, null);
+            }
+        } else if ("content".equalsIgnoreCase(uri.getScheme())) {
+
+            imagePath = getImagePath(uri, null);
+        }
+
+        displayImage(imagePath);
     }
 
 
-}
+    private void handleImageBeforeKitKat(Intent data) {
+        Uri uri = data.getData();
+        String imagePath = getImagePath(uri, null);
+        displayImage(imagePath);
+    }
+
+
+    private String getImagePath(Uri uri, String selection) {
+        String path = null;
+        Cursor cursor = getContentResolver().query(uri, null, selection, null, null);
+        if (cursor != null) {
+
+            if (cursor.moveToFirst()) {
+                path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));
+            }
+
+            cursor.close();
+        }
+        return path;
+    }
+
+
+    private void displayImage(String imagePath) {
+        if (imagePath != null) {
+
+            Bitmap bitmap = BitmapFactory.decodeFile(imagePath);
+            picture.setImageBitmap(bitmap);
+        } else {
+            Toast.makeText(this, "failed to get image", Toast.LENGTH_SHORT).show();
+        }
+    }
+}

students/com1714080901133/app/src/main/res/layout/com_1714080901133_activity.xml

@@ -1,43 +1,35 @@
 <?xml version="1.0" encoding="utf-8"?>
-<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    tools:context="edu.hzuapps.androidlabs.com1714080901133.Com1714080901133Activity">
-
-    <TextView
-        android:id="@+id/textView"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="运动场地浏览，点击图片跳转下一张"
-        android:textSize="30dp"
-        android:layout_alignParentLeft="true"
-        android:layout_alignParentStart="true"
-        android:layout_above="@+id/hzu" />
-
-    <ImageView
-        android:id="@+id/hzu"
-        android:layout_width="match_parent"
-        android:layout_height="384dp"
-        android:contentDescription="ture"
-        android:drawablePadding="1dp"
-        android:src="@drawable/hzxy"
-        android:layout_marginBottom="48dp"
-        android:layout_alignParentBottom="true"
-        android:layout_alignParentLeft="true"
-        android:layout_alignParentStart="true" />
-
-    <ImageView
-        android:id="@+id/img"
-        android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:layout_alignParentRight="true"
-        android:layout_alignParentEnd="true"
-        android:layout_below="@+id/textView" />
-
-</RelativeLayout>
-
-
-
-
+    tools:context=".Com1714080901133Activity">
+
+    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+        android:layout_width="368dp"
+        android:layout_height="551dp"
+        android:orientation="vertical"
+        tools:layout_editor_absoluteY="8dp"
+        tools:layout_editor_absoluteX="8dp">
+
+        <Button
+            android:id="@+id/take_photo"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="拍照" />
+
+        <Button
+            android:id="@+id/choose_photo"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:text="选择照片" />
+
+        <ImageView
+            android:id="@+id/picture"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="center_horizontal" />
+    </LinearLayout>
+
+</android.support.constraint.ConstraintLayout>