Phone internal file Storage--assets Directory

One. Create

1./src/main/assets

2. Switch to Project view mode and create a new folder under Main assets

Two. Features

1. Same level as Res

2. Mainly to store large files in the project

3. File is not managed by R class

Three. API

1.AssetManager Asset Manager

1-getassets () Get asset manager

2-open (file name) returns the InputStream of the file

2.imageview:setimagebitmap (Bitmap instance) to set a bitmap for a picture view

3.Bitmap bitmap: bitmapfactory.decodefile (picture file path) Use factory method to get Bitmap of picture file.

The image internal storage code shows:

1 <?XML version= "1.0" encoding= "Utf-8"?>2 <LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"3 Xmlns:tools= "Http://schemas.android.com/tools"4 Android:layout_width= "Match_parent"5 Android:layout_height= "Match_parent"6 Android:paddingbottom= "@dimen/activity_vertical_margin"7 Android:paddingleft= "@dimen/activity_horizontal_margin"8 Android:paddingright= "@dimen/activity_horizontal_margin"9 Android:paddingtop= "@dimen/activity_vertical_margin"Ten Tools:context= "Com.hanqi.testapp3.MainActivity" One android:orientation= "vertical"> A  -  -  the     <Button -         Android:layout_width= "Match_parent" - Android:layout_height= "Wrap_content" - Android:text= "Save asset file to internal storage" + Android:onclick= "Bt4_onclick"/> -  +     <ImageView A         Android:layout_width= "Wrap_content" at Android:layout_height= "30DP" - Android:id= "@+id/iv_1" - android:src= "@drawable/f9"/> -  -     <Button -         Android:layout_width= "Match_parent" in Android:layout_height= "Wrap_content" - Android:text= "Set picture pointing to internal storage" to Android:onclick= "Bt5_onclick"/> +  -  the  *  $ Panax Notoginseng </LinearLayout>

picture Phone internal storage

1  Packagecom.hanqi.testapp3;2 3 Importandroid.content.SharedPreferences;4 ImportAndroid.content.res.AssetManager;5 ImportAndroid.graphics.Bitmap;6 Importandroid.graphics.BitmapFactory;7 Importandroid.os.Environment;8 Importandroid.support.v7.app.AppCompatActivity;9 ImportAndroid.os.Bundle;Ten ImportAndroid.text.BidiFormatter; One ImportAndroid.view.View; A ImportAndroid.widget.EditText; - ImportAndroid.widget.ImageView; - ImportAndroid.widget.TextView; the ImportAndroid.widget.Toast; -  - ImportJava.io.File; - ImportJava.io.FileInputStream; + ImportJava.io.FileOutputStream; - ImportJava.io.InputStream; + ImportJava.io.PrintStream; A  at  -  Public classMainactivityextendsappcompatactivity { -  -    - ImageView iv_1; -  in @Override -     protected voidonCreate (Bundle savedinstancestate) { to         Super. OnCreate (savedinstancestate); + Setcontentview (r.layout.activity_main); -  the  *iv_1=(ImageView) Findviewbyid (r.id.iv_1); $ Panax Notoginseng     } -  the  +  A     //Saving asset files to internal storage the      Public  voidBt4_onclick (View v) +     { -         Try { $  $             //manipulating assets Directory files -  -             //1. Get Assetsmanager the  -Assetmanager am=getassets ();Wuyi  the             //2. Manipulate the asset catalog, read-write side-by- side -             //1) Read file to memory InputStream WuInputStream Is=am.open ("Car.png"); -  About  $             //2) Write file to directory OutputStream -FileOutputStream fos=openfileoutput ("Test.png", mode_private); -  -             //Read and write first A             byte[] b=New byte[1024]; +             intI=0; the  -              while((I=is.read (b)) >0) $             { theFos.write (b,0, i); the             } the  the fos.close (); - is.close (); in  theToast.maketext (mainactivity. This, "Save file succeeded", Toast.length_short). Show (); the  About  the  the         } the         Catch(Exception e) +         { -Toast.maketext (mainactivity. This, "Error saving file", Toast.length_short). Show (); the         }Bayi     } the  the     //set a picture to point to internal storage -      Public voidBt5_onclick (View v) -     { the  the         //1. Get the file path theString Path=getfilesdir (). GetAbsolutePath () + "/test.png"; the  -Toast.maketext (mainactivity. This, "path=" +path, Toast.length_long). Show (); the  the         //2. Get Bitmap,bitmapfactory.decodefile ("File path") from the image stored internally; theBitmap bm=bitmapfactory.decodefile (path);94  the         //3. Set picture source for picture View the Iv_1.setimagebitmap (BM); the     }98  About    -}

picture Phone internal storage. Java

Phone internal file Storage--assets Directory