Internal Storage

[ehspor 37]

ذخیره کردن متن و خواندن متن از حافظه داخلی

فایل جاوا

package com.ele.ehspor.internalstorage;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import java.io.FileInputStream;
import java.io.FileOutputStream;

public class MainActivity extends AppCompatActivity
{

    Button b1, b2;
    TextView tv;
    EditText ed1;

    String data;
    private String file = "mydata";

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        b1 = (Button) findViewById(R.id.button);
        b2 = (Button) findViewById(R.id.button2);

        ed1 = (EditText) findViewById(R.id.editText);
        tv = (TextView) findViewById(R.id.textView2);
        b1.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                data = ed1.getText().toString();

                try {
                    FileOutputStream fOut = openFileOutput(file, MODE_ENABLE_WRITE_AHEAD_LOGGING);
                    fOut.write(data.getBytes());
                    fOut.close();
                    Toast.makeText(getBaseContext(), "file saved", Toast.LENGTH_SHORT).show();
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        });

        b2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                try {
                    FileInputStream fin = openFileInput(file);
                    int c;
                    String temp = "";

                    while ((c = fin.read()) != -1) {
                        temp = temp + Character.toString((char) c);
                    }
                    tv.setText(temp);
                    Toast.makeText(getBaseContext(), "file read", Toast.LENGTH_SHORT).show();
                }
                catch (Exception e)
                {
                }
            }
        });
    }
}

لایوت

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">

    <TextView android:text="Internal storage" android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/textview"
        android:textSize="35dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Tutorials point"
        android:id="@+id/textView"
        android:layout_below="@+id/textview"
        android:layout_centerHorizontal="true"
        android:textColor="#ff7aff24"
        android:textSize="35dp" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Save"
        android:id="@+id/button"
        android:layout_alignParentBottom="true"
        android:layout_alignLeft="@+id/textView"
        android:layout_alignStart="@+id/textView" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/editText"
        android:hint="Enter Text"
        android:focusable="true"
        android:textColorHighlight="#ff7eff15"
        android:textColorHint="#ffff25e6"
        android:layout_below="@+id/imageView"
        android:layout_alignRight="@+id/textView"
        android:layout_alignEnd="@+id/textView"
        android:layout_marginTop="42dp"
        android:layout_alignLeft="@+id/imageView"
        android:layout_alignStart="@+id/imageView" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="load"
        android:id="@+id/button2"
        android:layout_alignTop="@+id/button"
        android:layout_alignRight="@+id/editText"
        android:layout_alignEnd="@+id/editText" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Read"
        android:id="@+id/textView2"
        android:layout_below="@+id/editText"
        android:layout_toLeftOf="@+id/button2"
        android:layout_toStartOf="@+id/button2"
        android:textColor="#ff5bff1f"
        android:textSize="25dp" />

</RelativeLayout>