How to store files in Android memory J

Supports reading and writing data to a file, creating a new file

Main

 Packagecom.chuanxidemo.shaoxin.demo06;ImportAndroid.os.Bundle;Importandroid.support.annotation.Nullable;Importandroid.support.v7.app.AppCompatActivity;ImportAndroid.util.Log;ImportAndroid.view.View;ImportAndroid.widget.Button;ImportJava.io.FileInputStream;Importjava.io.FileNotFoundException;ImportJava.io.FileOutputStream;Importjava.io.IOException;/*** Created by Shaoxin on 2017/2/23.*/ Public classMainextendsappcompatactivity {PrivateButton Read; PrivateButton Write; PrivateFileOutputStream OutputStream; PrivateFileInputStream InputStream; @Overrideprotected voidonCreate (@Nullable Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.main); Read=(Button) Findviewbyid (R.id.read); Write=(Button) Findviewbyid (r.id.write); Read.setonclicklistener (NewMyclick ()); Write.setonclicklistener (NewMyclick ()); }     Public classMyclickImplementsView.onclicklistener {@Override Public voidOnClick (View v) {Switch(V.getid ()) { CaseR.id.write:Try{OutputStream= Openfileoutput ("Test.txt", Mode_append); Outputstream.write ("123". GetBytes ()); } Catch(FileNotFoundException e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); } finally {                        Try {                            if(OutputStream! =NULL) {outputstream.close (); }                        } Catch(IOException e) {e.printstacktrace (); }                    }                     Break;  CaseR.id.read:Try{InputStream= Openfileinput ("Test.txt"); byte[] bytes =New byte[1024]; intnum = 0; intI =0;  while(num = Inputstream.read ())!=-1) {Bytes[i]= (byte) num; I++; } log.i ("MSG", "OnClick:" +NewString (bytes,0, i)); } Catch(FileNotFoundException e) {e.printstacktrace (); } Catch(IOException e) {e.printstacktrace (); }finally {                        if(inputstream!=NULL){                            Try{inputstream.close (); } Catch(IOException e) {e.printstacktrace (); }                        }                    }                     Break; }        }    }}

Main.xml

<?XML version= "1.0" encoding= "Utf-8"?><LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"android:orientation= "vertical">    <ButtonAndroid:id= "@+id/read"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "Read File" />    <ButtonAndroid:id= "@+id/write"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"Android:text= "Write file" /></LinearLayout>

How to store files in Android memory J