Android

Android Spinner set Selected Item by Value

The spinner provides a way to set the selected valued based on the position using the setSelection(int position) method. Now to get the position based on a value you have to loop thru the spinner and get the position. Here is an example

mySpinner.setSelection(getIndex(mySpinner, myValue));
 
 private int getIndex(Spinner spinner, String myString){
 
  int index = 0;
 
  for (int i=0;i<spinner.getCount();i++){
   if (spinner.getItemAtPosition(i).equals(myString)){
    index = i;
   }
  }
  return index;
 }

mySpinner.setSelection(getIndex(mySpinner, myValue));

private int getIndex(Spinner spinner, String myString){

int index = 0;

for (int i=0;i<spinner.getCount();i++){

if (spinner.getItemAtPosition(i).equals(myString)){

index = i;

}

return index;

}

If you are using an ArrayList for your Spinner Adapter then […]

shubham sharma February 15, 2017 Read More

Platform Codenames, Versions, API Levels, and NDK Releases

The code names match the following version numbers, along with API levels and NDK releases provided for convenience: Code name Version API level Nougat 7.1 API level 25 Nougat 7.0 API level 24 Marshmallow 6.0 API level 23 Lollipop 5.1 API level 22 Lollipop 5.0 API level 21 KitKat 4.4 – 4.4.4 API level 19 […]

shubham sharma February 2, 2017 Read More

Android Internal and External storage example – Store and Retrieve Data

Android Internal Storage Internal storage are private to your application and other applications cannot access them (nor can the user). When the user uninstalls your application, these files are removed. Android External Storage External storage such as SD card can also store application data, there’s no security enforced upon files you save to the external […]

shubham sharma February 1, 2017 Read More

Android marshmallow request permission?

Open a Dialog using the code below:

 ActivityCompat.requestPermissions(MainActivity.this,
                    new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
                    1);

ActivityCompat.requestPermissions(MainActivity.this,

new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},

1);

Get the Activity result as below:

@Override
public void onRequestPermissionsResult(int requestCode,
                                       String permissions[], int[] grantResults) {
    switch (requestCode) {
        case 1: {

          // If request is cancelled, the result arrays are empty.
          if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                // permission was granted, yay! Do the
                // contacts-related task you need to do.          
            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.
                Toast.makeText(MainActivity.this, "Permission denied to read your External storage", Toast.LENGTH_SHORT).show();
            }
            return;
        }

        // other 'case' lines to check for other
        // permissions this app might request
    }
}

@Override

public void onRequestPermissionsResult(int requestCode,

String permissions[], int[] grantResults) {

switch (requestCode) {

case 1: {

// If request is cancelled, the result arrays are empty.

if (grantResults.length > 0

&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {

// permission was granted, yay! Do the

// contacts-related task you need to do.

} else {

// permission denied, boo! Disable the

// functionality that depends on this permission.

Toast.makeText(MainActivity.this, "Permission denied to read your External storage", Toast.LENGTH_SHORT).show();

}

return;

}

// other 'case' lines to check for other

// permissions this app might request

}

More info: https://developer.android.com/training/permissions/requesting.html

shubham sharma January 31, 2017 Read More

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

Transprent Colors

for (double i = 1; i >= 0; i -= 0.01) {
    i = Math.round(i * 100) / 100.0d;
    int alpha = (int) Math.round(i * 255);
    String hex = Integer.toHexString(alpha).toUpperCase();
    if (hex.length() == 1) hex = "0" + hex;
    int percent = (int) (i * 100);
    System.out.println(String.format("%d%% — %s", percent, hex));
}

for (double i = 1; i >= 0; i -= 0.01) {

i = Math.round(i * 100) / 100.0d;

int alpha = (int) Math.round(i * 255);

String hex = Integer.toHexString(alpha).toUpperCase();

if (hex.length() == 1) hex = "0" + hex;

int percent = (int) (i * 100);

System.out.println(String.format("%d%% — %s", percent, hex));

}

100% — FF 99% — FC 98% — FA 97% — F7 96% — F5 95% — F2 94% — F0 93% — ED 92% — EB 91% — E8 90% — E6 89% — E3 88% — E0 87% — DE 86% — DB 85% — D9 84% — D6 83% — D4 […]

shubham sharma December 21, 2016 Read More

New Dev Point

Some problems explained

Android

Platform Codenames, Versions, API Levels, and NDK Releases

Android Internal and External storage example – Store and Retrieve Data

Android marshmallow request permission?

Android Studio Gradle project sync failed

getChildFragmentManager

How to make android app’s background image repeat

how to use runOnUiThread

Transprent Colors