Android Developers Studio: Android development tutorials

Showing posts with label Android development tutorials. Show all posts

Thursday, 3 November 2016

InternalStorage

Android Internal storage is the capacity of the private information on the gadget memory. Naturally, sparing and stacking documents to the inner stockpiling are private to the application and different applications won't have entry to these records. At the point when the client uninstalls the applications the inward put away documents connected with the application are additionally expelled. Nonetheless, take note of that a few clients root their Android telephones, picking up superuser get to. These clients will have the capacity to peruse and compose whatever records they wish.

For example as shown figure is internal storage in android.

InternalStorage Figure

code for internal storage in android

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"

 android:orientation="vertical"

 tools:context="com.kiranapp.MainActivity"

 android:background="#f3f0f0">

<TextView

 android:layout_width="wrap_content"

 android:layout_height="wrap_content"

 android:textAppearance="?android:attr/textAppearanceLarge"

 android:text="Welcome to internal storage in android"

 android:id="@+id/textView"

 android:layout_marginTop="20dp"

 android:layout_gravity="center_horizontal" />

<EditText

 android:layout_width="match_parent"

 android:layout_height="wrap_content"

 android:id="@+id/editText"

 android:layout_marginTop="20dp"

 android:layout_gravity="center_horizontal" />

<Button

 android:layout_width="wrap_content"

 android:layout_height="wrap_content"

 android:text="Text to write"

 android:layout_alignTop="@+id/button2"

 android:id="@+id/button"

 android:onClick="click text"

 android:layout_gravity="center_horizontal" />

<Button

 android:layout_width="wrap_content"

 android:layout_height="wrap_content"

 android:text="Read from file"

 android:onClick="click read"

 android:id="@+id/button2"

 android:layout_gravity="center_horizontal" />
</LinearLayout>

MainActivity.java :-

package com.kiranapp;

import android.os.Bundle;
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 java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class MainActivity extends AppCompatActivity {
    EditText editText;
   // TextView t1;
  //  Button b1,b2;
    static final int READ_BLOCK_SIZE = 100;
@Override

 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
// t1=(TextView)findViewById(R.id.textView);
// b1=(Button)findViewById(R.id.button);
// b2=(Button)findViewById(R.id.button2);
 editText=(EditText)findViewById(R.id.editText);
 }

public void WriteBtn(View v) {
try {
FileOutputStream fileout=openFileOutput("file.txt", MODE_PRIVATE);
OutputStreamWriter outputWriter=new OutputStreamWriter(fileout);
outputWriter.write(editText.getText().toString());
outputWriter.close();
Toast.makeText(getBaseContext(), "saved",Toast.LENGTH_SHORT).show();
}
catch (Exception e) {
e.printStackTrace();
}
}
public void ReadBtn(View v) {
try {
FileInputStream fileIn=openFileInput("file.txt");
InputStreamReader InputRead= new InputStreamReader(fileIn);
char[] inputBuffer= new char[READ_BLOCK_SIZE];
String s="";
int charRead;
while ((charRead=InputRead.read(inputBuffer))>0) {
String readstring=String.copyValueOf(inputBuffer,0,charRead);
s +=readstring;
}
InputRead.close();
editText.setText(s);
}

catch (Exception e) {
e.printStackTrace();
 }
}
}

Output :-

InternalStorage Fig :1

InternalStorage Fig :2

Wednesday, 12 October 2016

CustomDialog

It is a user defined dialog.
It is android widget.
It is similar to activity or user-interface(UI).
Using Dialog class
And create one more XML file and java file (its not mandatory)

activitymain.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"

 android:orientation="vertical"

 tools:context="com.kiranapp.MainActivity">


<Button

 android:layout_width="wrap_content"

 android:layout_height="wrap_content"

 android:text="customdialog"

 android:id="@+id/button"

 android:layout_gravity="center_horizontal" />
</LinearLayout>

customdialog :-

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

 android:orientation="vertical" android:layout_width="match_parent"

 android:layout_height="match_parent">

<EditText

 android:layout_width="match_parent"

 android:layout_height="wrap_content"

 android:id="@+id/editText"

 android:layout_gravity="center_horizontal"

 android:layout_marginTop="30dp"

 android:hint="enter  name" />

<Button

 android:layout_width="wrap_content"

 android:layout_height="wrap_content"

 android:text="enter"

 android:id="@+id/okbtn"

 android:layout_gravity="center_horizontal" />

<Button

 android:layout_width="wrap_content"

 android:layout_height="wrap_content"

 android:text="cancel"

 android:id="@+id/canbtn"

 android:layout_gravity="center_horizontal" />
</LinearLayout>

MainActivity.java :-

package com.kiranapp;

import android.app.Dialog;
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.Toast;

public class MainActivity extends AppCompatActivity {
 Button okbtn,canbtn;
 Dialog dialog;
 EditText e1;

@Override

 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 okbtn=(Button)findViewById(R.id.button);
 okbtn.setOnClickListener(new View.OnClickListener() {
@Override

 public void onClick(View v) {
 dialog=new Dialog(MainActivity.this);
 dialog.setTitle("Custom Dialog");
 dialog.setContentView(R.layout.customdialog);
 dialog.show();
 okbtn=(Button)dialog.findViewById(R.id.okbtn);
 canbtn=(Button)dialog.findViewById(R.id.canbtn);
 e1=(EditText)dialog.findViewById(R.id.editText);
 okbtn.setOnClickListener(new View.OnClickListener() {
@Override

 public void onClick(View v) {
 String s1=e1.getText().toString();
Toast.makeText(MainActivity.this, "Name is : "+s1, Toast.LENGTH_SHORT).show();
 }
});
canbtn.setOnClickListener(new View.OnClickListener() {
@Override

 public void onClick(View v) {
 dialog.cancel();
 }
});
}
});
}
}

Customdialog.java :-

package com.kiranapp;

/** * Created by Dell on 10/12/2016. */public class customdialog {
}

Output :-

Custom dialog fig :1

custom dialog fig :2

Switch

activitymain.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"
android:orientation="vertical"
tools:context="com.kiranapp.MainActivity"
android:background="#ddd6d6">
<Switch
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Bluetooh"
android:layout_marginTop="30dp"
android:id="@+id/switch1"
android:checked="false"
android:layout_gravity="center_horizontal" />
</LinearLayout>

MainActivity.java :-

package com.kiranapp;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.CompoundButton;
import android.widget.Switch;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
Switch aSwitch;

@Override
   protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);
   aSwitch=(Switch) findViewById(R.id.switch1);
aSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
   public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
   if (isChecked){
   Toast.makeText(MainActivity.this,"TurnOn",Toast.LENGTH_SHORT).show();
    }
else {
Toast.makeText(MainActivity.this,"TurnOff",Toast.LENGTH_SHORT).show();
}
}
});
}
}

Output :-

Switch fig:1

Switch fig:2

Pages

Thursday, 3 November 2016

InternalStorage

Wednesday, 12 October 2016

CustomDialog

Switch