Read the diagram from the SD card and display it (i)

In this section, we do a very simple demo that allows you to read an image from an SD card and display it in the app.

In three steps:
1. Set permissions.
Add three lines of permission information to the manifest file.

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

2. Configure the MXL view.
can refer to:

<?xml version= "1.0" encoding= "Utf-8"?><linearlayout xmlns:android="Http://schemas.android.com/apk/res/android"  Android:layout_width="Fill_parent"android:layout_height="Fill_parent"  Android:orientation="vertical" >                <ImageViewandroid:id= "@+id/myview"android:layout_width="Fill_ Parent "android:layout_height=" fill_parent " />                        </linearlayout>

3.Java Code Authoring section.
Roughly two steps: Get the picture file, show the picture
(See Code, notes for detailed procedures)

 PackageCom.example.showimage;Importandroid.app.Activity;ImportAndroid.graphics.Bitmap;ImportAndroid.graphics.BitmapFactory;ImportAndroid.os.Bundle;ImportAndroid.os.Environment;ImportAndroid.widget.ImageView; Public  class mainactivity extends Activity { PrivateImageView MyView =NULL;@Override     Public void onCreate(Bundle savedinstancestate) {Super. OnCreate (Savedinstancestate);        Setcontentview (R.layout.activity_main);        MyView = (ImageView) Findviewbyid (R.id.myview); String path = environment.getexternalstoragedirectory () +"/";//get the SD card default pathString name = path +"Image.jpg";//get the image File ' s path+namebitmapfactory.options option =NewBitmapfactory.options (); Option.insamplesize =Ten;//set the different pixel. The bigger,the LowerBitmap BM = bitmapfactory.decodefile (name,option);//decode The image file according to the PathName and the pixelMyview.setimagebitmap (BM);//let the ImageView myView equal to the bitmap}}

Note: Myview.setimagebitmap (BM); is to set the id attribute in the XML in the code. (Because the picture resource is not from the app itself (or the R Resource), it comes from the SD card. ）

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Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Read the diagram from the SD card and display it (i)