上传新文件

app/src/main/java/com/example/myfirstapp/FileProcess.java

+package example.com.save;
+
+/**
+ * 内部文件文件读写
+ */
+
+import android.content.Context;
+import android.icu.util.Calendar;
+import android.os.Build;
+import android.support.annotation.RequiresApi;
+
+import java.io.BufferedWriter;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.OutputStreamWriter;
+import java.io.Reader;
+import java.nio.ByteBuffer;
+
+
+public class FileProcess {
+
+    //写入文件
+    public static boolean writeInternalData(Context context, String strPath, int intTxt) {
+        FileOutputStream fos;
+        try{
+            fos=context.openFileOutput(strPath,0);
+            try{
+                String strTxt=Integer.toString(intTxt);
+                fos.write(strTxt.getBytes());
+                return true;
+            }catch (IOException e){
+                e.printStackTrace();
+                return false;
+            }
+        }catch (FileNotFoundException e){
+            e.printStackTrace();
+            return false;
+        }
+    }
+
+    //读取文件
+    public static int readInternalData(Context context, String strPath){
+        FileInputStream fis ;
+        byte[] buffer;
+        try{
+            fis=context.openFileInput(strPath);
+            try{
+                buffer=new byte[fis.available()];
+                fis.read(buffer);
+                String file_str=new String(buffer);
+                int number=Integer.valueOf(file_str);
+                return  number;
+            }catch (IOException e){
+                e.printStackTrace();
+                return 0;
+            }
+        }catch (FileNotFoundException e){
+            e.printStackTrace();
+            return 0;
+        }
+    }
+}
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