Develop Reference

Passing an image from an activity to another one

I want to pass images from one activity to another when button clicked. I have one button "Show Image" in first activity. When I click on it, it should pass two images from my mipmap folder of my project and go to second activity and show one of the passed image on the ImageView of that activity. On second activity, I have two buttons which are supposed to receive images and show those images when clicked on each button. I tried using intent to pass the image, however, it didn't work. Is there other way to send images from mipmap folder from one activity to another?
Here is my code:
MainActivity.java
package com.example.abina.myapplication;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import java.io.ByteArrayOutputStream;
public class MainActivity extends AppCompatActivity {
Button button;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
showmyImage();
}
});
}
public void showmyImage(){
Intent intent = new Intent(this, Main2Activity.class);
Bitmap bitmap; // your bitmap
bitmap = null;
ByteArrayOutputStream _bs = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.PNG, 50, _bs);
intent.putExtra("byteArray", _bs.toByteArray());
startActivity(intent);
}
}
activity_main.xml
<RelativeLayout android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_centerVertical="true"
android:layout_marginStart="137dp"
android:text="Show Image" />
</RelativeLayout>
Main2Activity.java
package com.example.abina.myapplication;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ImageView;
public class Main2Activity extends AppCompatActivity {
Button image1;
Button image2;
ImageView imageView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
image1 =(Button) findViewById(R.id.image1);
image2 = (Button) findViewById(R.id.image2);
imageView =(ImageView) findViewById(R.id.imageView);
if(getIntent().hasExtra("byteArray")) {
Bitmap _bitmap = BitmapFactory.decodeByteArray(
getIntent().getByteArrayExtra("byteArray"),0,getIntent().getByteArrayExtra("byteArray").length);
imageView.setImageBitmap(_bitmap);
}
}
}
activity_main2.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Main2Activity">
<Button
android:id="#+id/image1"
android:layout_width="199dp"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:text="Image1" />
<Button
android:id="#+id/image2"
android:layout_width="183dp"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_alignParentTop="true"
android:layout_marginEnd="0dp"
android:text="Image2" />
<ImageView
android:id="#+id/imageView"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
Images

First the mipmap folders are for placing your app/launcher icons (which are shown on the homescreen) in only. Any other drawable assets you use should be placed in the relevant drawable folders.
Next since they will be in your drawables, I would just pass the #DrawableRes id e.g. the R.id.image_name value.
Intent intent = new Intent(this, Main2Activity.class);
intent.putExtra(IMAGE_RES_ID_KEY, R.id.imageName);
startActivity(intent);
Also I would recommend that you use a public static variable IMAGE_RES_ID_KEY for your extra key to avoid typos.
Then on the other side you can simply
if(getIntent().hasExtra(MainActivity.IMAGE_RES_ID_KEY)) {
imageView.setImageResource(getIntent().getIntExtra(MainActivity.IMAGE_RES_ID_KEY, 0));
}

Click ImageButton, take a picture and save photo in same imagebutton, even if leave application Android

I want to build an application that when I click the ImageButton to take a picture that image becomes the default Imagebutton image forever until I change again.
I can take a picture and it becomes the ImageButton image. The problem right now is that when I leave the application the image disappears from Imagebutton.
Help me find a solution for that code, or showing me another code. Thanks
MainActivity
package com.example.camera;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageButton;
public class MainActivity extends Activity {
ImageButton btnTackPic;
Uri photoPath;
static int TAKE_PICTURE = 1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnTackPic = (ImageButton) findViewById(R.id.imageButton1);
btnTackPic.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, TAKE_PICTURE);
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
if (requestCode == TAKE_PICTURE && resultCode == RESULT_OK) {
Bitmap photo = (Bitmap)intent.getExtras().get("data");
btnTackPic.setImageBitmap(photo);
btnTackPic.setVisibility(View.VISIBLE);
}
}
}
activity_main.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"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.camera.MainActivity" >
<ImageButton
android:id="#+id/imageButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:src="#drawable/ic_launcher" />
</RelativeLayout>

You have several options to store your app data on the device. For images, the best and fastest solution if the to use an image caching technique. If you're looking for a fast solution, check the default caching implementation provided by the devs. Once you have your bitmap ready, store it to your cache. Later on when the app reloads, first thing you do is to check your cache for any stored bitmaps, and load it into your imageButton.

android statement do not execute after setText in TextView

i am developing a small application in android. my activity_main consists of three things Button ,TextView and ImageView
and here is the code of main activity
package com.example.shiv.facedetection;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.media.FaceDetector;
import android.media.FaceDetector.Face;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onthetapbuttonclick(View View){
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(intent, 0);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
try{
Bitmap bp = (Bitmap) data.getExtras().get("data");
ImageView iv = (ImageView)findViewById(R.id.iv1);
Bitmap bitmap565 = bp.copy(Bitmap.Config.RGB_565, true);
if((1==(bitmap565.getWidth()%2))){
bitmap565 = Bitmap.createScaledBitmap(bitmap565,
bitmap565.getWidth()+1, bitmap565.getHeight(), false);
}
FaceDetector fd = new FaceDetector(bitmap565.getWidth(),bitmap565.getHeight(), 4);
Face[] faces =new Face[4];
int i =fd.findFaces(bitmap565, faces);
TextView tv =(TextView)findViewById(R.id.text1);
if(i>0){
iv.setImageBitmap(bp);
System.out.println("face ////////////////detectecd");
tv.setText("faces detected "+i);
}
else{
iv.setImageBitmap(bp);
System.out.println("no face ////////////////detectecd");
tv.setText("No face detected");
System.out.print("hello world");
}
}catch(Exception e ){
System.out.println("exception occured");
}
}
}
and activity_main is
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<Button
android:layout_height="wrap_content"
android:layout_width="fill_parent"
android:text="click to take the photo"
android:id="#+id/button"
android:onClick="onthetapbuttonclick"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/text1"
android:text="status"/>
<ImageView
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:id="#+id/iv1"
android:contentDescription="taken photo"
/>
</LinearLayout>
now problem is when i click the image every thing work pretty fine.
if a face is detected then it will show the face detected + number of faces in the TextView and set the clicked pic in the ImageView and will print no face detected if face is not detected, but after that no statement is getting executed.
e.g in "no face ////////////////detected" is getting printed but "hello world " is not getting printed.
I have tried updating the TextView using a Thread. but problem persists
I have tested it many times and both android studio for linux as well as for windows. Kindly help

how to give an audio file as input to the google speech to text api?

currently i made a 'speechtotext' app using the google speech to text api.
It takes whatever i speak near the mic as an input and displays the text form of it by sending it to google and getting the result from it.
Well,instead of speaking,i want to give an audio file as the input(which i have previously recorded using 'sound recorder' app) to my "speech to text" app.
This audio file is present in the sdcard of the phone.
Google speech to text api should choose this audio file as the input and then give its text form as the output.
I have pasted my "100% working" code of the xml and the java files for your references.
my xml file :
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_above="#+id/textView1"
android:layout_toLeftOf="#+id/textView1"
android:background="#drawable/superim"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/activity_horizontal_margin"
android:text="#string/tap_on_the_button_to_speak_"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#ffffff" />
<ImageButton
android:id="#+id/btnSpeak"
android:layout_width="253dp"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:contentDescription="#string/speak"
android:src="#android:drawable/ic_btn_speak_now" />
<TextView
android:id="#+id/txtText"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="10dp"
android:layout_weight="0.38"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textColor="#ffffff"
/>
</LinearLayout>
my java file:
package com.prann.speechtotextdemo;
import java.util.ArrayList;
import android.app.Activity;
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.os.Bundle;
import android.speech.RecognizerIntent;
//import android.view.Menu;
import android.view.View;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity {
protected static final int RESULT_SPEECH = 1;
private ImageButton btnSpeak;
private TextView txtText;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtText = (TextView) findViewById(R.id.txtText);
btnSpeak = (ImageButton) findViewById(R.id.btnSpeak);
btnSpeak.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(
RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, "en-US");
try {
startActivityForResult(intent, RESULT_SPEECH);
txtText.setText("");
} catch (ActivityNotFoundException a) {
Toast t = Toast.makeText(getApplicationContext(),
"YOUR DEVICE DOESNT SUPPORT SPEECH TO TEXT \n install google vocie search ",
Toast.LENGTH_SHORT);
t.show();
}
}
});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (requestCode) {
case RESULT_SPEECH: {
if (resultCode == RESULT_OK && null != data) {
ArrayList<String> text = data
.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
txtText.setText(text.get(0));
}
break;
}
}
}
}
Is it possible to do what i want to do ?? if so,how can it be done ?????
A detailed explanation would be very appreciated.
Thank you in advance. :-)

How to access an image from the phone's photo gallery?

By any chance, does anyone know how to access the phone's photo gallery?
I am making an application that takes a picture of a plant leaf and
analyzes the image to determine whether or not it is determine. We were hoping that we
could give the user two options of taking the picture of the leaf or using an image of a
leaf that the user has already taken. However, we got the picture taking part, but we do not
know how to access the photo gallery.

You have to launch the Gallery App using the built-in Intents. After that, on your onActivityResult(), get the path of the selected image and load your image into your ImageView
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="#string/hello"
/>
<Button
android:id="#+id/loadimage"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Load Image"
/>
<TextView
android:id="#+id/targeturi"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<ImageView
android:id="#+id/targetimage"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
</LinearLayout>
Your Activity
package com.exercise.AndroidSelectImage;
import java.io.FileNotFoundException;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
public class AndroidSelectImage extends Activity {
TextView textTargetUri;
ImageView targetImage;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button buttonLoadImage = (Button)findViewById(R.id.loadimage);
textTargetUri = (TextView)findViewById(R.id.targeturi);
targetImage = (ImageView)findViewById(R.id.targetimage);
buttonLoadImage.setOnClickListener(new Button.OnClickListener(){
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
Intent intent = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(intent, 0);
}});
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
// TODO Auto-generated method stub
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK){
Uri targetUri = data.getData();
textTargetUri.setText(targetUri.toString());
Bitmap bitmap;
try {
bitmap = BitmapFactory.decodeStream(getContentResolver().openInputStream(targetUri));
targetImage.setImageBitmap(bitmap);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}

Do not forget to add the following permissions to AndroidManifest.xml:
<uses-permission android:name="android.permission.MANAGE_DOCUMENTS" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />