android--data storage: SD card storage for external storage of mobile phones

Xml

 <EditTextAndroid:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:id= "@+id/et_5"Android:hint= "What to store"/>    <EditTextAndroid:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:id= "@+id/et_6"Android:hint= "Content read from file"        />    <LinearLayoutAndroid:layout_width= "Match_parent"Android:layout_height= "Wrap_content"android:orientation= "Horizontal">        <ButtonAndroid:layout_width= "0DP"Android:layout_height= "Wrap_content"Android:text= "Save to Directory with package name"Android:layout_weight= "1"Android:onclick= "Onclick7"/>        <ButtonAndroid:layout_width= "0DP"Android:layout_height= "Wrap_content"Android:text= "Get from directory with package name"Android:layout_weight= "1"Android:onclick= "Onclick8"/>    </LinearLayout>    <LinearLayoutAndroid:layout_width= "Match_parent"Android:layout_height= "Wrap_content"android:orientation= "Horizontal">        <ButtonAndroid:layout_width= "0DP"Android:layout_height= "Wrap_content"Android:text= "Save to a custom directory"Android:layout_weight= "1"Android:onclick= "Onclick9"/>        <ButtonAndroid:layout_width= "0DP"Android:layout_height= "Wrap_content"Android:text= "Getting from a custom directory"Android:layout_weight= "1"Android:onclick= "Onclick10"/>    </LinearLayout>

Java

   //save files to the directory with package names to the external space store     Public voidonclick7 (view view) {//        if(Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {//1. Get the content you want to storeString content =Et_5.gettext (). toString (); //2. Get the external storage directory with package name--only to the root directory//String Sdpath = Environment.getexternalstoragedirectory (). GetAbsolutePath (); //Toast.maketext (activitydata.this, "sdpath=" +sdpath, Toast.length_long). Show (); //the parameter represents a subdirectory of a different file type if it is not passed null gets the directory with the package name under the root directoryString Sdpath = Getexternalfilesdir (NULL). GetAbsolutePath (); Toast.maketext (activitydata. This, "sdpath=" +Sdpath, Toast.length_long). Show (); //3. Constructing the output streamSdpath + = "/" +FILENAME; Try{FileOutputStream fos=NewFileOutputStream (Sdpath,true); //traditional Way byte array modeFos.write (Content.getbytes ("Utf-8"));                Fos.close (); Toast.maketext (activitydata. This, "Saved successfully", Toast.length_short). Show (); } Catch(Exception e) {e.printstacktrace (); Toast.maketext (activitydata. This, "Save Failed", Toast.length_short). Show (); }        }        Else{toast.maketext (activitydata). This, "SD card is not mounted", Toast.length_short). Show (); }    }    //Read the package name file from the external storage space//determine if the mount is mounted     Public voidonclick8 (view view) {if(Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {//1. Get the content you want to store//String content = Et_5.gettext (). toString (); //2. Get the external storage directory with package name--only to the root directory//String Sdpath = Environment.getexternalstoragedirectory (). GetAbsolutePath (); //Toast.maketext (activitydata.this, "sdpath=" +sdpath, Toast.length_long). Show (); //the parameter represents a subdirectory of a different file type if it is not passed null gets the directory with the package name under the root directoryString Sdpath = Getexternalfilesdir (NULL). GetAbsolutePath (); //Toast.maketext (activitydata.this, "sdpath=" +sdpath, Toast.length_long). Show (); //3. Constructing the input streamSdpath + = "/" +FILENAME; Try{FileInputStream fis=NewFileInputStream (Sdpath); byte[] B =New byte[1024]; inti = 0; StringBuilder SBR=NewStringBuilder ();  while((i = Fis.read (b)) >0) {sbr.append (NewString (b,0, i));                Et_6.settext (SBR);                } fis.close (); Toast.maketext (activitydata. This, "Get Success", Toast.length_short). Show (); } Catch(Exception e) {e.printstacktrace (); Toast.maketext (activitydata. This, "Get Failed", Toast.length_short). Show (); }        }        Else{toast.maketext (activitydata). This, "SD card is not mounted", Toast.length_short). Show (); }    }    //saving files to a custom directory     Public voidOnclick9 (view view) {if(Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {//1. Get the content you want to storeString content =Et_5.gettext (). toString (); //2. Get the root directory for external storageString Sdpath =environment.getexternalstoragedirectory (). GetAbsolutePath (); //Create subdirectories in the root directory of the SD cardSdpath + = "/hanqi"; //instantiate file, point to a directoryFile File =NewFile (Sdpath); //If it does not exist, create a            if(!file.exists ()) {                //Create a directoryFile.mkdirs (); } toast.maketext (Activitydata. This, "path=" +Sdpath, Toast.length_short). Show (); //3. Create an output streamSdpath + = "/" +FILENAME; Try{FileOutputStream fos=NewFileOutputStream (Sdpath,true); //traditional Way byte array modeFos.write (Content.getbytes ("Utf-8"));                    Fos.close (); Toast.maketext (activitydata. This, "Saved successfully", Toast.length_short). Show (); } Catch(Exception e) {e.printstacktrace (); Toast.maketext (activitydata. This, "Save Failed", Toast.length_short). Show (); }            }        Else{toast.maketext (activitydata). This, "SD card is not mounted", Toast.length_short). Show (); }    }     Public voidonclick10 (view view) {if(Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {//1. Get the content you want to store//String content = Et_5.gettext (). toString (); //2. Get the external storage directory with package name--only to the root directoryString Sdpath =environment.getexternalstoragedirectory (). GetAbsolutePath (); //Toast.maketext (activitydata.this, "sdpath=" +sdpath, Toast.length_long). Show (); //the parameter represents a subdirectory of a different file type if it is not passed null gets the directory with the package name under the root directory//String sdpath = Getexternalfilesdir (null). GetAbsolutePath (); //Toast.maketext (activitydata.this, "sdpath=" +sdpath, Toast.length_long). Show (); //3. Constructing the input streamSdpath + = "/hanqi/" +FILENAME; Toast.maketext (activitydata. This, ""+Sdpath, Toast.length_short). Show (); Try{FileInputStream fis=NewFileInputStream (Sdpath); byte[] B =New byte[1024]; inti = 0; StringBuilder SBR=NewStringBuilder ();  while((i = Fis.read (b)) >0) {sbr.append (NewString (b,0, i));                Et_6.settext (SBR);                } fis.close (); Toast.maketext (activitydata. This, "Get Success", Toast.length_short). Show (); } Catch(Exception e) {e.printstacktrace (); Toast.maketext (activitydata. This, "Get Failed", Toast.length_short). Show (); }        }        Else{toast.maketext (activitydata). This, "SD card is not mounted", Toast.length_short). Show (); }    }

android--data storage: SD card storage for external phone storage