Camera Application using startActivityForResult Example

Screenshots :

activity_main.xml :

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

<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"

tools:context="com.chantisandroid.exampleapp.MainActivity">

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="CAMERA"

        android:id="@+id/button"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="44dp" />

    <ImageView

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        android:id="@+id/imageView"

        android:layout_below="@+id/button"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="10dp" />

</RelativeLayout>

MainActivity.java :

package com.chantisandroid.exampleapp;

import android.content.Intent;

import android.graphics.Bitmap;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    Button camera;

    ImageView photo;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        photo = (ImageView)findViewById(R.id.imageView);

        camera = (Button)findViewById(R.id.button);

        camera.setOnClickListener(this);

        }

    @Override

    public void onClick(View view) {

        Intent in = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

        startActivityForResult(in, 0);

    }

    @Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == 0) {

            Bitmap image = (Bitmap) data.getExtras().get("data");

            photo.setImageBitmap(image);

        } else if (resultCode == RESULT_CANCELED) {

            Toast.makeText(this, "your device does not supported camera", Toast.LENGTH_SHORT).show();

        }

    }

}

AndroidManifest.xml :

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

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

    package="com.chantisandroid.exampleapp">

    <uses-permission android:name="android.permission.CAMERA" />

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>

Android Activity Life Cycle

• Does not crash if the user receives a phone call or switches to another app while using your app.
• Does not consume valuable system resources when the user is not actively using it.
• Does not lose the user's progress if they leave your app and return to it at a later time.
• Does not crash or lose the user's progress when the screen rotates between landscape and portrait orientation.

Every knows about create the activity and start the activity

Resumed

In this state, the activity is in the foreground and the user can interact with it. (Also sometimes referred to as the "running" state.)

Paused

In this state, the activity is partially obscured by another activity—the other activity that's in the foreground is semi-transparent or doesn't cover the entire screen. The paused activity does not receive user input and cannot execute any code.

Stopped

In this state, the activity is completely hidden and not visible to the user; it is considered to be in the background. While stopped, the activity instance and all its state information such as member variables is retained, but it cannot execute any code.

Passing data between Activities using Bundle in Android Example

Screenshots :

activity_main.xml :

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

<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"

tools:context="com.chantisandroid.exampleapp.MainActivity">

    <EditText

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:id="@+id/editText"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="46dp"

        android:layout_marginLeft="5dp"

        android:layout_marginRight="5dp"

        android:hint="Plz enter name" />

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="send"

        android:id="@+id/button"

        android:layout_alignParentBottom="true"

        android:layout_centerHorizontal="true"

        android:layout_marginBottom="105dp" />

    <EditText

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:inputType="phone"

        android:ems="10"

        android:id="@+id/editText2"

        android:layout_below="@+id/editText"

        android:layout_alignLeft="@+id/editText"

        android:layout_alignStart="@+id/editText"

        android:layout_alignRight="@+id/editText"

        android:layout_alignEnd="@+id/editText"

        android:layout_marginTop="20dp"

        android:hint="Plz enter number" />

    <EditText

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:id="@+id/editText3"

        android:layout_below="@+id/editText2"

        android:layout_alignRight="@+id/editText2"

        android:layout_alignEnd="@+id/editText2"

        android:layout_alignLeft="@+id/editText2"

        android:layout_alignStart="@+id/editText2"

        android:hint="Plz enter website"

        android:layout_marginTop="20dp" />

    <EditText

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:inputType="textEmailAddress"

        android:ems="10"

        android:id="@+id/editText4"

        android:layout_below="@+id/editText3"

        android:layout_alignRight="@+id/editText3"

        android:layout_alignEnd="@+id/editText3"

        android:layout_alignLeft="@+id/editText3"

        android:layout_alignStart="@+id/editText3"

        android:layout_marginTop="20dp"

        android:hint="Plz enter email" />

</RelativeLayout>

activity_second.xml :

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

<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"

    tools:context="com.chantisandroid.exampleapp.SecondActivity">

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

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

        android:id="@+id/textView"

        android:layout_marginLeft="20dp"

        android:layout_marginTop="20dp"

        />

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

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

        android:id="@+id/textView4"

        android:layout_below="@+id/textView"

        android:layout_alignParentLeft="true"

        android:layout_alignParentStart="true"

        android:layout_marginTop="20dp"

        android:layout_marginLeft="20dp" />

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

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

        android:id="@+id/textView5"

        android:layout_below="@+id/textView4"

        android:layout_alignLeft="@+id/textView4"

        android:layout_alignStart="@+id/textView4"

        android:layout_marginTop="20dp" />

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

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

        android:id="@+id/textView6"

        android:layout_below="@+id/textView5"

        android:layout_alignLeft="@+id/textView5"

        android:layout_alignStart="@+id/textView5"

        android:layout_marginTop="20dp" />

</RelativeLayout>

MainActivity.java :

package com.chantisandroid.exampleapp;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.text.TextUtils;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    Button button;

    EditText name,number,website,email;

    String string,string2,string3,string4;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        name = (EditText)findViewById(R.id.editText);

        number = (EditText)findViewById(R.id.editText2);

        website = (EditText)findViewById(R.id.editText3);

        email = (EditText)findViewById(R.id.editText4);

        button = (Button)findViewById(R.id.button);

        button.setOnClickListener(this);

    }

    @Override

    public void onClick(View view) {

        string = name.getText().toString().trim();

        string2 = number.getText().toString().trim();

        string3 = website.getText().toString().trim();

        string4 = email.getText().toString().trim();

        if(TextUtils.isEmpty(string)){

            name.setError("Plz enter your name");

            name.requestFocus();

            return;

        }

        if(TextUtils.isEmpty(string2)){

            number.setError("Plz enter your number");

            number.requestFocus();

            return;

        }

        if(TextUtils.isEmpty(string3)){

            website.setError("Plz enter your website");

            website.requestFocus();

            return;

        }

        if(TextUtils.isEmpty(string4)){

            email.setError("Plz enter your email");

            email.requestFocus();

            return;

        }

            long phno = Long.parseLong(string2);

            Bundle bundle = new Bundle();

            bundle.putString("myname", string);

            bundle.putLong("phnum", phno);

            bundle.putString("website", string3);

            bundle.putString("email", string4);

            Intent intent = new Intent(getApplicationContext(), SecondActivity.class);

            intent.putExtras(bundle);

            startActivity(intent);

        }

     }

SecondActivity.java :

package com.chantisandroid.exampleapp;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.widget.TextView;

public class SecondActivity extends AppCompatActivity {

    TextView nametext,numbertext,websitetext,emailtext;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_second);

        nametext = (TextView)findViewById(R.id.textView);

        numbertext = (TextView)findViewById(R.id.textView4);

        websitetext = (TextView)findViewById(R.id.textView5);

        emailtext = (TextView)findViewById(R.id.textView6);

        Intent in = getIntent();

        Bundle b = in.getExtras();

        String name = b.getString("myname");

        String website = b.getString("website");

        String email = b.getString("email");

        long phnumber = b.getLong("phnum");

        String phno = Long.toString(phnumber);

        nametext.setText(name);

        numbertext.setText(phno);

        websitetext.setText(website);

        emailtext.setText(email);

    }

}

AndroidManifest.xml :

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

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

    package="com.chantisandroid.exampleapp">

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name=".SecondActivity"></activity>

    </application>

</manifest>

Passing Data between Activities using Intent Example

Screenshots :

activity_main.xml :

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

<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"

tools:context="com.chantisandroid.exampleapp.MainActivity">

    <EditText

        android:layout_width="match_parent"

        android:layout_height="wrap_content"

        android:id="@+id/editText"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="46dp"

        android:layout_marginLeft="5dp"

        android:layout_marginRight="5dp" />

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="send"

        android:id="@+id/button"

        android:layout_marginTop="58dp"

        android:layout_below="@+id/editText"

        android:layout_centerHorizontal="true" />

</RelativeLayout>

activity_second.xml :

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

<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"

    tools:context="com.chantisandroid.exampleapp.SecondActivity">

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

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

        android:id="@+id/textView"

        android:layout_centerVertical="true"

        android:layout_centerHorizontal="true" />

</RelativeLayout>

MainActivity.java :

package com.chantisandroid.exampleapp;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    Button button;

    EditText editText;

    String string;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        editText = (EditText)findViewById(R.id.editText);

        button = (Button)findViewById(R.id.button);

        button.setOnClickListener(this);

    }

    @Override

    public void onClick(View view) {

        string = editText.getText().toString().trim();

        Intent in = new Intent(this, SecondActivity.class);

        in.putExtra("name", string);

        startActivity(in);

     }

}

SecondActivity.java :

package com.chantisandroid.exampleapp;

import android.content.Intent;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.widget.TextView;

public class SecondActivity extends AppCompatActivity {

    TextView textView;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_second);

        textView = (TextView)findViewById(R.id.textView);

        Intent in = getIntent();

        String myname = in.getStringExtra("name");

        textView.setText(myname);

    }

}

AndroidManifest.xml :

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

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

    package="com.chantisandroid.exampleapp">

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <activity android:name=".SecondActivity"></activity>

    </application>

</manifest>

Android Intent Example

Screenshots :

activity_main.xml :

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

<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"

tools:context="com.chantisandroid.exampleapp.MainActivity">

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="Implicit intent"

        android:id="@+id/button"

        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="82dp" />

    <Button

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="explicit intent"

        android:id="@+id/button2"

        android:layout_below="@+id/button"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="46dp" />

</RelativeLayout>

activity_second.xml :

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

<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"

    tools:context="com.chantisandroid.exampleapp.SecondActivity">

    <TextView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

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

        android:text="this is second activity"

        android:id="@+id/textView"

        android:layout_centerVertical="true"

        android:layout_centerHorizontal="true" />

</RelativeLayout>

MainActivity.java :

package com.chantisandroid.exampleapp;

import android.content.Intent;

import android.net.Uri;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    Button button,button2;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        button = (Button)findViewById(R.id.button);

        button.setOnClickListener(this);

        button2 = (Button)findViewById(R.id.button2);

        button2.setOnClickListener(this);

    }

    @Override

    public void onClick(View view) {

        switch (view.getId()){

            case R.id.button:

                Intent intent=new Intent(Intent.ACTION_VIEW);

                intent.setData(Uri.parse("https://chantisandroid.blogspot.in/"));

                startActivity(intent);

                break;

            case R.id.button2:

                Intent in = new Intent(this,SecondActivity.class);

                startActivity(in);

                break;

        }

    }

}

SecondActivity.java :

package com.chantisandroid.exampleapp;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

public class SecondActivity extends AppCompatActivity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_second);

    }

}

AndroidManifest.xml :

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

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

    package="com.chantisandroid.exampleapp">

    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label="@string/app_name"

        android:supportsRtl="true"

        android:theme="@style/AppTheme">

        <activity android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

         //add this line

        <activity android:name=".SecondActivity"></activity>

    </application>

</manifest>