Android Blog: October 2013

Android GridView with full Image?

GridView layout in one of the most useful layouts in android. Gridview is mainly useful when we want show data in grid layout like displaying images or icons. This layout can be used to build applications like image viewer, audio or video players in order to show elements in grid manner.

1). Create a new project by going to File ⇒ New Android Project and fill required details.
2). Prepare your images which you want to show in grid layout and place them in res ⇒ drawable-hdpi folder.
3).Create a new XML layout under layout and name it as

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

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

android:id="@+id/grid_view"

android:layout_width="fill_parent"

android:layout_height="fill_parent"

android:numColumns="auto_fit"

android:columnWidth="90dp"

android:horizontalSpacing="10dp"

android:verticalSpacing="10dp"

android:gravity="center"

android:stretchMode="columnWidth" >

</GridView>

Android Disable and Enable WIFI, GORS and Mobile Data state useing Toggle Button?

Wifi_State.java

public class Wifi_State extends Activity {
private int bv;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.wifi);

bv = Build.VERSION.SDK_INT;

ToggleButton togglegps = (ToggleButton) findViewById(R.id.GpsButton);
togglegps
.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {

if (isChecked) {
turnOnDataConnection(true, Wifi_State.this);
Toast.makeText(getApplicationContext(),
"gprs Enabled!", Toast.LENGTH_LONG).show();
} else {
turnOnDataConnection(false, Wifi_State.this);
Toast.makeText(getApplicationContext(),
"gprs Disabled!", Toast.LENGTH_LONG).show();
}
}
});

ToggleButton toggle = (ToggleButton) findViewById(R.id.toggleButton);
toggle.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
if (isChecked) {
toggleWiFi(true);
Toast.makeText(getApplicationContext(), "Wi-Fi Enabled!",
Toast.LENGTH_LONG).show();
} else {
toggleWiFi(false);
Toast.makeText(getApplicationContext(), "Wi-Fi Disabled!",
Toast.LENGTH_LONG).show();
}

if (isChecked) {
// Button is ON
Log.i("", "true");
Intent intent = new Intent(
"android.location.GPS_ENABLED_CHANGE");
intent.putExtra("enabled", true);
sendBroadcast(intent);

String provider = Settings.Secure.getString(
getContentResolver(),
Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
if (!provider.contains("gps")) { // if gps is disabled
final Intent poke = new Intent();
poke.setClassName("com.android.settings",
"com.android.settings.widget.SettingsAppWidgetProvider");
poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
poke.setData(Uri.parse("3"));
sendBroadcast(poke);
}
} else {
// Button is OFF
Log.i("", "false");
String provider = Settings.Secure.getString(
getContentResolver(),
Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
if (provider.contains("gps")) { // if gps is enabled
final Intent poke = new Intent();
poke.setClassName("com.android.settings",
"com.android.settings.widget.SettingsAppWidgetProvider");
poke.addCategory(Intent.CATEGORY_ALTERNATIVE);
poke.setData(Uri.parse("3"));
sendBroadcast(poke);
}
}
}
});
}

// this is used for mobile data on and off condition

boolean turnOnDataConnection(boolean ON, Context context) {

try {
if (bv == Build.VERSION_CODES.FROYO)

{
Method dataConnSwitchmethod;
Class<?> telephonyManagerClass;
Object ITelephonyStub;
Class<?> ITelephonyClass;

TelephonyManager telephonyManager = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);

telephonyManagerClass = Class.forName(telephonyManager
.getClass().getName());
Method getITelephonyMethod = telephonyManagerClass
.getDeclaredMethod("getITelephony");
getITelephonyMethod.setAccessible(true);
ITelephonyStub = getITelephonyMethod.invoke(telephonyManager);
ITelephonyClass = Class.forName(ITelephonyStub.getClass()
.getName());

if (ON) {
dataConnSwitchmethod = ITelephonyClass
.getDeclaredMethod("enableDataConnectivity");
} else {
dataConnSwitchmethod = ITelephonyClass
.getDeclaredMethod("disableDataConnectivity");
}
dataConnSwitchmethod.setAccessible(true);
dataConnSwitchmethod.invoke(ITelephonyStub);

} else {
final ConnectivityManager conman = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
final Class<?> conmanClass = Class.forName(conman.getClass()
.getName());
final Field iConnectivityManagerField = conmanClass
.getDeclaredField("mService");
iConnectivityManagerField.setAccessible(true);
final Object iConnectivityManager = iConnectivityManagerField
.get(conman);
final Class<?> iConnectivityManagerClass = Class
.forName(iConnectivityManager.getClass().getName());
final Method setMobileDataEnabledMethod = iConnectivityManagerClass
.getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
setMobileDataEnabledMethod.setAccessible(true);
setMobileDataEnabledMethod.invoke(iConnectivityManager, ON);
}
return true;
} catch (Exception e) {
Log.e("TAG", "error turning on/off data");
return false;
}
}

public void toggleWiFi(boolean status) {
WifiManager wifiManager = (WifiManager) this
.getSystemService(Context.WIFI_SERVICE);
if (status == true && !wifiManager.isWifiEnabled()) {
wifiManager.setWifiEnabled(true);
} else if (status == false && wifiManager.isWifiEnabled()) {
wifiManager.setWifiEnabled(false);
}
}
}

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"

tools:context=".MainActivity" >

<ToggleButton

android:id="@+id/toggleButton"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:layout_above="@+id/imageView1"

android:layout_alignLeft="@+id/imageView1"

android:layout_marginBottom="37dp"

android:text="ToggleButton" />

</RelativeLayout>

And give this permissions to You `Androidmanifest.xml`

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.WAKE_LOCK"/>

Android Check GPS State On and Off condition useing Toggle Button?

MainActivity.java

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

final ToggleButton tB = (ToggleButton) findViewById(R.id.toggleButton);

tB.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View arg0) {

if (tB.isChecked()) {

// Button is ON

Log.i("", "true");

Intent intent = new Intent(

"android.location.GPS_ENABLED_CHANGE");

intent.putExtra("enabled", true);

sendBroadcast(intent);

String provider = Settings.Secure.getString(

getContentResolver(),

Settings.Secure.LOCATION_PROVIDERS_ALLOWED);

if (!provider.contains("gps")) { // if gps is disabled

final Intent poke = new Intent();

poke.setClassName("com.android.settings",

"com.android.settings.widget.SettingsAppWidgetProvider");

poke.addCategory(Intent.CATEGORY_ALTERNATIVE);

poke.setData(Uri.parse("3"));

sendBroadcast(poke);

}

} else {

// Button is OFF

Log.i("", "false");

String provider = Settings.Secure.getString(

getContentResolver(),

Settings.Secure.LOCATION_PROVIDERS_ALLOWED);

if (provider.contains("gps")) { // if gps is enabled

final Intent poke = new Intent();

poke.setClassName("com.android.settings",

"com.android.settings.widget.SettingsAppWidgetProvider");

poke.addCategory(Intent.CATEGORY_ALTERNATIVE);

poke.setData(Uri.parse("3"));

sendBroadcast(poke);

}

});

}

activity.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" >

<LinearLayout

android:id="@+id/toggleButton1"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:orientation="horizontal" >

<ToggleButton

android:id="@+id/toggleButton"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:layout_marginLeft="50dp"

android:layout_marginRight="50dp"

android:layout_marginTop="50dp"

android:text="ToggleButton" />

</LinearLayout>

</RelativeLayout>

and give permissions to in `Androidmanifest.xml ` like this

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

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

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

Android Orientation changes With out reload Activity?

In API level 13 or above, the screen size changes when the orientation changes, so this still causes the activity to be destroyed and started when orientation changes.

Simply add the "screenSize" attribute in `Androidmanifest.xml`

<activity
    android:name=".YourActivityName"
    android:configChanges="orientation|screenSize">
</activity>

Now, when your change orientation (and screen size changes), the activity keeps its state and onConfigurationChanged() is called. This will keep whatever is on the screen.

Reference: See this Articals

1). http://developer.android.com/guide/topics/resources/runtime-changes.html

2).http://developer.android.com/guide/topics/manifest/activity-element.html

And here is Another way see picture

Android Select image from gallery and display in imageview?

GallerysampleActivity.java

public class GallerysampleActivity extends Activity {
private static Bitmap Image = null;
private static Bitmap rotateImage = null;
private ImageView imageView;
private static final int GALLERY = 1;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

imageView = (ImageView) findViewById(R.id.imageView1);

Button gallery = (Button) findViewById(R.id.button1);
gallery.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {

imageView.setImageBitmap(null);
if (Image != null)Image.recycle();
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), GALLERY);
}
});
}

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == GALLERY && resultCode != 0) {
Uri mImageUri = data.getData();
try {

Image = Media.getBitmap(this.getContentResolver(), mImageUri);
if (getOrientation(getApplicationContext(), mImageUri) != 0) {
Matrix matrix = new Matrix();
matrix.postRotate(getOrientation(getApplicationContext(), mImageUri));
if (rotateImage != null)
rotateImage.recycle();
rotateImage = Bitmap.createBitmap(Image, 0, 0, Image.getWidth(), Image.getHeight(), matrix,
true);
imageView.setImageBitmap(rotateImage);
} else
imageView.setImageBitmap(Image);
} catch (FileNotFoundException e) {

e.printStackTrace();
} catch (IOException e) {

e.printStackTrace();
}
}
}

public static int getOrientation(Context context, Uri photoUri) {
/* it's on the external media. */
Cursor cursor = context.getContentResolver().query(photoUri,
new String[] { MediaStore.Images.ImageColumns.ORIENTATION }, null, null, null);

if (cursor.getCount() != 1) {
return -1;
}

cursor.moveToFirst();
return cursor.getInt(0);
}
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
android:orientation="vertical" >

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="100dp"
android:layout_marginTop="20dp"
android:text="Go to gallery" />

<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

</LinearLayout>

Android Blog

Android GridView with full Image?

Android Disable and Enable WIFI, GORS and Mobile Data state useing Toggle Button?

Android Check GPS State On and Off condition useing Toggle Button?

Android Orientation changes With out reload Activity?

Android Select image from gallery and display in imageview?

Output Images

Select DateRange UsingRangePicker.

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