How to make a txt file and read txt file from internal storage in android?
This example demonstrates How to brand a txt file and read txt file from internal storage in android.
Step one − Create a new project in Android Studio, become to File ⇒ New Projection and make full all required details to create a new project.
Step ii − Add the following code to res/layout/activity_main.xml.
<?xml version = "1.0" encoding = "utf-8"?> <LinearLayout 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" tools:context = ".MainActivity" android:orientation = "vertical"> <EditText android:id = "@+id/enterText" android:hint = "Please enter text here" android:layout_width = "match_parent" android:layout_height = "wrap_content" /> <Push android:id = "@+id/salvage" android:text = "Save" android:layout_width = "wrap_content" android:layout_height = "wrap_content" /> <TextView android:id = "@+id/output" android:layout_width = "wrap_content" android:textSize = "25sp" android:layout_height = "wrap_content" /> </LinearLayout>
In the above code, we have taken editext and button. When user click on push button, information technology volition accept information from edittext and store in internal storage as /data/data/<your.package.name>/files/text/sample.txt. It going to suspend the data to textview from sample.txt
Stride 3 − Add the following code to src/MainActivity.java
package com.example.andy.myapplication; import android.os.Bundle; import android.os.Environment; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import coffee.io.BufferedReader; import java.io.File; import coffee.io.FileInputStream; import java.io.FileReader; import java.io.FileWriter; import coffee.io.IOException; import coffee.io.InputStreamReader; public form MainActivity extends AppCompatActivity { Push button save; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); last TextView output = findViewById(R.id.output); final EditText enterText = findViewById(R.id.enterText); salve = findViewById(R.id.save); save.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (!enterText.getText().toString().isEmpty()) { File file = new File(MainActivity.this.getFilesDir(), "text"); if (!file.exists()) { file.mkdir(); } try { File gpxfile = new File(file, "sample"); FileWriter writer = new FileWriter(gpxfile); writer.append(enterText.getText().toString()); writer.affluent(); author.close(); output.setText(readFile()); Toast.makeText(MainActivity.this, "Saved your text", Toast.LENGTH_LONG).show(); } catch (Exception e) { } } } }); } private String readFile() { File fileEvents = new File(MainActivity.this.getFilesDir()+"/text/sample"); StringBuilder text = new StringBuilder(); attempt { BufferedReader br = new BufferedReader(new FileReader(fileEvents)); Cord line; while ((line = br.readLine()) ! = nil) { text.append(line); text.suspend('\n'); } br.close(); } catch (IOException eastward) { } String result = text.toString(); return result; } } Footstep four − Add together the following code to manifest.xml
<?xml version = "one.0" encoding = "utf-8"?> <manifest xmlns:android = "http://schemas.android.com/apk/res/android" package = "com.example.andy.myapplication"> <uses-permission android:name = "android.permission.WRITE_EXTERNAL_STORAGE"/> <uses-permission android:name = "android.permission.READ_EXTERNAL_STORAGE"/> <application android:allowBackup = "true" android:icon = "@mipmap/ic_launcher" android:label = "@string/app_name" android:roundIcon = "@mipmap/ic_launcher_round" android:supportsRtl = "truthful" android:theme = "@style/AppTheme"> <action android:proper noun = ".MainActivity"> <intent-filter> <action android:proper noun = "android.intent.activity.Chief" /> <category android:name = "android.intent.category.LAUNCHER" /> </intent-filter> </activity> </awarding> </manifest>
Let's attempt to run your awarding. I presume you accept connected your actual Android Mobile device with your calculator. To run the app from android studio, open i of your project's activity files and click Run 
icon from the toolbar. Select your mobile device every bit an option and so check your mobile device which volition display your default screen −
In the above result, nosotros accept added some text and clicked on salve button equally shown below –
To verify the above result, /data/data/<your.package.name>/files/text/sample.txt equally shown below –
Click here to download the project code
Published on fifteen-Mar-2019 06:40:47
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