Android

Android Spinner Dropdown Example

package com.androidhive.spinner;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
import android.widget.AdapterView.OnItemSelectedListener;

public class AndroidSpinnerExampleActivity extends Activity implements OnItemSelectedListener{
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);

// Spinner element
 Spinner spinner = (Spinner) findViewById(R.id.spinner);

// Spinner click listener
 spinner.setOnItemSelectedListener(this);

// Spinner Drop down elements
 List<String> categories = new ArrayList<String>();
 categories.add("Automobile");
 categories.add("Business Services");
 categories.add("Computers");
 categories.add("Education");
 categories.add("Personal");
 categories.add("Travel");

// Creating adapter for spinner
 ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);

// Drop down layout style - list view with radio button
 dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

// attaching data adapter to spinner
 spinner.setAdapter(dataAdapter);
 }

 @Override
 public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
// On selecting a spinner item
 String item = parent.getItemAtPosition(position).toString();

// Showing selected spinner item
 Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();

 }

 public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub

 }

}

package com.androidhive.spinner;

import java.util.ArrayList;

import java.util.List;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.Spinner;

import android.widget.Toast;

import android.widget.AdapterView.OnItemSelectedListener;

public class AndroidSpinnerExampleActivity extends Activity implements OnItemSelectedListener{

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

// Spinner element

Spinner spinner = (Spinner) findViewById(R.id.spinner);

// Spinner click listener

spinner.setOnItemSelectedListener(this);

// Spinner Drop down elements

List<String> categories = new ArrayList<String>();

categories.add("Automobile");

categories.add("Business Services");

categories.add("Computers");

categories.add("Education");

categories.add("Personal");

categories.add("Travel");

// Creating adapter for spinner

ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);

// Drop down layout style - list view with radio button

dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

// attaching data adapter to spinner

spinner.setAdapter(dataAdapter);

}

@Override

public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {

// On selecting a spinner item

String item = parent.getItemAtPosition(position).toString();

// Showing selected spinner item

Toast.makeText(parent.getContext(), "Selected: " + item, Toast.LENGTH_LONG).show();

}

public void onNothingSelected(AdapterView<?> arg0) {

// TODO Auto-generated method stub

}

shubham sharma January 11, 2017 Read More

Android Studio Gradle project sync failed

<span class="typ">Error</span><span class="pun">:</span><span class="typ">Unable</span><span class="pln"> to start the daemon process</span><span class="pun">.</span> 
<span class="typ">This</span><span class="pln"> problem might be caused by incorrect configuration of the daemon</span><span class="pun">.</span> 
<span class="typ">For</span><span class="pln"> example</span><span class="pun">,</span><span class="pln"> an unrecognized jvm option is used</span><span class="pun">.</span> 
<span class="typ">Please</span><span class="pln"> refer to the user guide chapter on the daemon at http</span><span class="pun">:</span><span class="com">//gradle.org/docs/1.10/userguide/gradle_daemon.html </span>
<span class="typ">Please</span><span class="pln"> read below process output to find out more</span><span class="pun">:</span>
    <span class="pun">-----------------------</span> 
<span class="typ">Error</span><span class="pln"> occurred during initialization of VM </span><span class="typ">Could</span><span class="pln"> not reserve enough space </span><span class="kwd">for</span><span class="pln"> object heap </span><span class="typ">Error</span><span class="pun">:</span> <span class="typ">Could</span><span class="pln"> not create the </span><span class="typ">Java</span> <span class="typ">Virtual</span> <span class="typ">Machine</span><span class="pun">.</span> 
<span class="typ">Error</span><span class="pun">:</span><span class="pln"> A fatal exception has occurred</span><span class="pun">.</span> <span class="typ">Program</span><span class="pln"> will exit</span><span class="pun">.</span>

Error:Unable to start the daemon process.

This problem might be caused by incorrect configuration of the daemon.

For example, an unrecognized jvm option is used.

Please refer to the user guide chapter on the daemon at http://gradle.org/docs/1.10/userguide/gradle_daemon.html

Please read below process output to find out more:

-----------------------

Error occurred during initialization of VM Could not reserve enough space for object heap Error: Could not create the Java Virtual Machine.

Error: A fatal exception has occurred. Program will exit.

Just a blind guess: try to add something like this to your gradle.properties file in the project:

org.gradle.jvmargs=-Xmx512m -XX:MaxPermSize=512m

1	org.gradle.jvmargs=-Xmx512m -XX:MaxPermSize=512m

shubham sharma January 2, 2017 Read More

getChildFragmentManager

getChildFragmentManager() on programmatically (dynamically) added Fragments? accepted In conclusion, I want to reference OuterFrag in MainActivity always. And I want OuterFrag act as a placeholder to load different InnerFrags. In short, I want to call getChildFragmentManager() in OuterFrag, when it is added programmatically (dynamically). If you want this then make your OuterFrag have a container […]

shubham sharma December 31, 2016 Read More

How to make android app’s background image repeat

Ok, here’s what I’ve got in my app. It includes a hack to prevent ListViews from going black while scrolling. drawable/app_background.xml:

<?xml version="1.0" encoding="utf-8"?>
    <bitmap xmlns:android="http://schemas.android.com/apk/res/android"
        android:src="@drawable/actual_pattern_image"
        android:tileMode="repeat" />

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

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

android:src="@drawable/actual_pattern_image"

android:tileMode="repeat" />

values/styles.xml:

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

  <style name="app_theme" parent="android:Theme">
    <item name="android:windowBackground">@drawable/app_background</item>
    <item name="android:listViewStyle">@style/TransparentListView</item>
    <item name="android:expandableListViewStyle">@style/TransparentExpandableListView</item>
  </style>

  <style name="TransparentListView" parent="@android:style/Widget.ListView">
    <item name="android:cacheColorHint">@android:color/transparent</item>
  </style>

  <style name="TransparentExpandableListView" parent="@android:style/Widget.ExpandableListView">
    <item name="android:cacheColorHint">@android:color/transparent</item>
  </style>

</resources>

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

<item name="android:windowBackground">@drawable/app_background</item>

<item name="android:listViewStyle">@style/TransparentListView</item>

<item name="android:expandableListViewStyle">@style/TransparentExpandableListView</item>

</style>

<item name="android:cacheColorHint">@android:color/transparent</item>

</style>

<item name="android:cacheColorHint">@android:color/transparent</item>

</style>

</resources>

AndroidManifest.xml:

<application android:theme="@style/app_theme">

1	<application android:theme="@style/app_theme">

shubham sharma December 29, 2016 Read More

how to use runOnUiThread

private void runThread() {

    new Thread() {
        public void run() {
            while (i++ < 1000) {
                try {
                    runOnUiThread(new Runnable() {

                        @Override
                        public void run() {
                            btn.setText("#" + i);
                        }
                    });
                    Thread.sleep(300);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }
    }.start();
}

private void runThread() {

new Thread() {

public void run() {

while (i++ < 1000) {

try {

runOnUiThread(new Runnable() {

@Override

public void run() {

btn.setText("#" + i);

}

});

Thread.sleep(300);

} catch (InterruptedException e) {

e.printStackTrace();

}

}.start();

}

shubham sharma December 22, 2016 Read More

Create Custom TextView with custom fonts

public class MyTextView extends TextView {

    public MyTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    public MyTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public MyTextView(Context context) {
        super(context);
        init();
    }

    private void init() {
        if (!isInEditMode()) {
            Typeface tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/Lato-Regular.ttf");
            setTypeface(tf);
        }
    }

}

public class MyTextView extends TextView {

public MyTextView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

init();

}

public MyTextView(Context context, AttributeSet attrs) {

super(context, attrs);

init();

}

public MyTextView(Context context) {

super(context);

init();

}

private void init() {

if (!isInEditMode()) {

Typeface tf = Typeface.createFromAsset(getContext().getAssets(), "fonts/Lato-Regular.ttf");

setTypeface(tf);

}

in xml file

 <customfonts.MyTextView
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginTop="16dp"
                    android:gravity="center"
                    android:text="Stories to read"
                    android:textColor="#757575"
                    android:textSize="16dp" />

<customfonts.MyTextView

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_marginTop="16dp"

android:gravity="center"

android:text="Stories to read"

android:textColor="#757575"

android:textSize="16dp" />

where “customfonts.MyTextView” is package and class name

shubham sharma December 16, 2016 Read More

Using Android intents to share a link

 Intent intent = new Intent(Intent.ACTION_SEND);
                      intent.setType("text/plain");
                      intent.putExtra(Intent.EXTRA_TEXT, "http://www.techrepublic.com");
                      intent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Check out this site!");
startActivity(Intent.createChooser(intent, "Share"));

Intent intent = new Intent(Intent.ACTION_SEND);

intent.setType("text/plain");

intent.putExtra(Intent.EXTRA_TEXT, "http://www.techrepublic.com");

intent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Check out this site!");

startActivity(Intent.createChooser(intent, "Share"));

shubham sharma December 10, 2016 Read More

Copy Assets to Extrenal file

////////////////////////////
private void copyAssets() {
    AssetManager assetManager = getActivity().getAssets();
    String[] files = null;
    try {
        files = assetManager.list("");
    } catch (IOException e) {
        Log.e("tag", "Failed to get asset file list.", e);
    }
    if (files != null) for (String filename : files) {
        InputStream in = null;
        OutputStream out = null;
        try {
            in = assetManager.open(filename);
            File outFile = new File(getActivity().getExternalFilesDir(null), filename);
            out = new FileOutputStream(outFile);
            copyFile(in, out);
        } catch(IOException e) {
            Log.e("tag", "Failed to copy asset file: " + filename, e);
        }
        finally {
            if (in != null) {
                try {
                    in.close();
                } catch (IOException e) {
                    // NOOP
                }
            }
            if (out != null) {
                try {
                    out.close();
                } catch (IOException e) {
                    // NOOP
                }
            }
        }
    }
}
private void copyFile(InputStream in, OutputStream out) throws IOException {
    byte[] buffer = new byte[1024];
    int read;
    while((read = in.read(buffer)) != -1){
        out.write(buffer, 0, read);
    }
}

////////////////////////////

private void copyAssets() {

AssetManager assetManager = getActivity().getAssets();

String[] files = null;

try {

files = assetManager.list("");

} catch (IOException e) {

Log.e("tag", "Failed to get asset file list.", e);

}

if (files != null) for (String filename : files) {

InputStream in = null;

OutputStream out = null;

try {

in = assetManager.open(filename);

File outFile = new File(getActivity().getExternalFilesDir(null), filename);

out = new FileOutputStream(outFile);

copyFile(in, out);

} catch(IOException e) {

Log.e("tag", "Failed to copy asset file: " + filename, e);

}

finally {

if (in != null) {

try {

in.close();

} catch (IOException e) {

// NOOP

}

if (out != null) {

try {

out.close();

} catch (IOException e) {

// NOOP

}

private void copyFile(InputStream in, OutputStream out) throws IOException {

byte[] buffer = new byte[1024];

int read;

while((read = in.read(buffer)) != -1){

out.write(buffer, 0, read);

}

shubham sharma December 9, 2016 Read More

Android Storage system to access the path of External and Internal files and folders.

Android Storage system to access the path of External and Internal files and folders. Android uses more than one file system (think of “multiple drives/partitions” when comparing with your computer, while sharing a common base, directory structures might differ between manufacturers. What is a file system? A file system (or filesystem) is an abstraction to […]

shubham sharma December 9, 2016 Read More

Add code to print out the key hash

// Add code to print out the key hash
    try {
        PackageInfo info = getPackageManager().getPackageInfo(
                "com.facebook.samples.hellofacebook", 
                PackageManager.GET_SIGNATURES);
        for (Signature signature : info.signatures) {
            MessageDigest md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
            }
    } catch (NameNotFoundException e) {
        
    } catch (NoSuchAlgorithmException e) {
        
    }

// Add code to print out the key hash

try {

PackageInfo info = getPackageManager().getPackageInfo(

"com.facebook.samples.hellofacebook",

PackageManager.GET_SIGNATURES);

for (Signature signature : info.signatures) {

MessageDigest md = MessageDigest.getInstance("SHA");

md.update(signature.toByteArray());

Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));

}

} catch (NameNotFoundException e) {

} catch (NoSuchAlgorithmException e) {

}

shubham sharma December 9, 2016 Read More

New Dev Point

Some problems explained

Android

Android Studio Gradle project sync failed

getChildFragmentManager

How to make android app’s background image repeat

how to use runOnUiThread

Create Custom TextView with custom fonts

Copy Assets to Extrenal file

Android Storage system to access the path of External and Internal files and folders.

Add code to print out the key hash