How to Crop Image from gallery in Android

In my previous post i explained how to capture photos using Android camera today in this post i am going to 

explain how to crop image loading from gallery for this task following are my source codes 



CropActivity.java

package com.example.crop;

import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;


public class CropActivity extends Activity {
protected static final int PICK_FROM_GALLERY = 1;
Button btcrop;
ImageView imgview;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_crop);
btcrop= (Button) findViewById(R.id.btcrop);
imgview=(ImageView)findViewById(R.id.quickContactBadge1);
btcrop.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
Intent intent = new Intent();
// call android default gallery
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
// ******** code for crop image
intent.putExtra("crop", "true");
intent.putExtra("aspectX", 0);
intent.putExtra("aspectY", 0);
intent.putExtra("outputX", 200);
intent.putExtra("outputY", 150);

try {

intent.putExtra("return-data", true);
startActivityForResult(Intent.createChooser(intent,
"Complete action using"), PICK_FROM_GALLERY);

} catch (ActivityNotFoundException e) {
// Do nothing for now
}



}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_FROM_GALLERY) {
Bundle extras2 = data.getExtras();
if (extras2 != null) {
Bitmap photo = extras2.getParcelable("data");
imgview.setImageBitmap(photo);

}
}


}



}


Above code is my source code of crop project when ever i press crop button it will open image from gallery it show preview here i gave fixed size of length of image after that output show on ImageView

activity_crop.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <Button
        android:id="@+id/btcrop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="124dp"
        android:layout_marginTop="128dp"
        android:text="Crop" />

    <QuickContactBadge
        android:id="@+id/quickContactBadge1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/btcrop"
        android:layout_centerVertical="true" />

</RelativeLayout>

Above code is my layout file it have two fields one is button and one-more is  QuickContactBadge it like image view only

when ever i press button it will open image from  gallery after that output show's on image view

Android Compass Code Example

Today i am going explain how to design compass in android application example, why we develop

our own compass means suppose i went one as part my work but i don't know where West and North

. For finding position we are using compass . This post i am going explain compass example

CompasActivity.java

package com.vamsi.compas;

import android.app.Activity;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.animation.Animation;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import android.widget.TextView;

public class CompasActivity extends Activity implements SensorEventListener {
    // define the display assembly compass picture
    private ImageView image;
    // record the compass picture angle turned
    private float currentDegree = 0f;
   // device sensor manager
    private SensorManager mSensorManager;
    TextView tvHeading;
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_compas);
       //
        image = (ImageView) findViewById(R.id.imageViewCompass);
        // TextView that will tell the user what degree is he heading
        tvHeading = (TextView) findViewById(R.id.tvHeading);
        // initialize your android device sensor capabilities
        mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    }
   
    @Override
  protected void onResume() {
        super.onResume();
        // for the system's orientation sensor registered listeners
        mSensorManager.registerListener(this, mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION),
                SensorManager.SENSOR_DELAY_GAME);
    }

    @Override

    protected void onPause() {

        super.onPause();
        // to stop the listener and save battery
        mSensorManager.unregisterListener(this);
    }
    @Override

   public void onSensorChanged(SensorEvent event) {
      // get the angle around the z-axis rotated

        float degree = Math.round(event.values[0]);
        tvHeading.setText("Heading: " + Float.toString(degree) + " degrees");
        // create a rotation animation (reverse turn degree degrees)

        RotateAnimation ra = new RotateAnimation(
                currentDegree,
                -degree,
                Animation.RELATIVE_TO_SELF, 0.5f,
                Animation.RELATIVE_TO_SELF,
               0.5f);
        // how long the animation will take place
        ra.setDuration(210);
        // set the animation after the end of the reservation status
        ra.setFillAfter(true);
        // Start the animation
        image.startAnimation(ra);
        currentDegree = -degree;
    }
    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // not in use
    }

}



The above source code is my java source code Here i am use TextView for displaying heading, ImageView for displaying the compass  and android will provide SensorManager i am using this finding heading


activity_compas.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#fff" >
    <TextView
        android:id="@+id/tvHeading"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
    android:layout_marginBottom="40dp"
        android:layout_marginTop="20dp"
        android:text="Heading: 0.0" />
    <ImageView
        android:id="@+id/imageViewCompass"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/tvHeading"
        android:layout_centerHorizontal="true"
        android:src="@drawable/compass" />
</RelativeLayout>

Above is my layout file and following is my out video

For this we don't need any permissions in Android Manifest file

Capture photos Using in Android pragmatically

Most Android devices have at least one camera. Some devices have a front and a back facing camera.

 Using the camera on the Android device can be done via the integration of existing camera application. In this case you would start the existing Camera application via an intent and use the return data of the application to access the result .
One more we can do it same work using Camera API this process little bit difficult. Today i am going to explain using Intent before going start i have few questions

what is intent ?

what is return type?

where it will return?

Once are you above questions you can easily understand my post 

Following is my source codes of Androidphoto project it works successfully 

PhotoActivity.java 

package com.vamsi.androidphoto;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class PhotoActivity extends Activity {

private Button photo;

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

@Override
public void onClick(View v) {
Intent captureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// we will handle the returned data in onActivityResult
startActivityForResult(captureIntent,1);

}
});
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
Log.d("PhotoActivity", "onActivityResult");

}
}

The above class when they press button it will open camera activity next after taking photo it will come back onActivityResult . This onActivityResult have three parameters first one requestcode this code will sent when ever we start intent  currently this code is 1 and resultCode is photo capture is successfully or not and data is for parsing photo like we can convert as bitmap or we can store a file in sdcard but currently i printing log message that place what ever you want do operation.

activity_photo.xml

<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"

  >

    <Button

        android:id="@+id/photo"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginTop="144dp"

        android:text="Photo" />

</RelativeLayout>

This my layoutfile of my project this layout  file i used one button when  ever user press it will open capture activity.

For doing above operation we need some permissions in manifest file 

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

Thank you studying my blog-spot you have any doubts please post comment section .