Rotation Changes in Android

Ever thought about WoWing your friends ….or simply just doing cheap tricks with your Android or more ridiculous like plotting your daily Starbucks allowance? Here’ s a neat way of doing exactly that – Screen Orientations & Rotations.
Some basics: Just to clear your frame of mind (..and mine) that is …mmmh
Portrait ..yep UpRight …and
Landscape yep lazy laying. Ok..now lets get to it!
An Example:
Plotting a list of numeric values which are contained in a list view and upon device rotation switches to a graphical plot view of the data. How neat is that!
Portrait List View of your data:

Landscape Graphical Chart View of your data:

Download:
AndroidOrientationChanges.zip
Steps involved:
Modify AndroidManifest.xml to allow for orientation changes and prevent keyboard from popping up.
Write layout XML files – display list
Write Java Activity – charts with DroidCharts
NOTE:
Screen orientation changes are per Activity :
android:configChanges=”orientation|keyboardHidden”
File: AndroidManifest.xml

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

02

<manifest

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

04	package="com.examples"

05	android:versionCode="1"

06	android:versionName="1.0">

07	<application

08	android:icon="@drawable/icon"

09	android:label="@string/app_name"

10	android:debuggable="true">

11

<activity

12	android:name=".DemoList"

13	android:label="@string/app_name"

14	android:configChanges="orientation|keyboardHidden"

15	android:screenOrientation="portrait">

16	<intent-filter>

17

<action

18	android:name="android.intent.action.MAIN" />

19

<category

20	android:name="android.intent.category.LAUNCHER" />

21	</intent-filter>

22	</activity>

23

24

<activity

25	android:name=".DemoCharts"

26	android:configChanges="orientation|keyboardHidden"></activity>

27	</application>

28	</manifest>

File: data_listview.xml

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

02	<LinearLayout

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

04	android:orientation="vertical"

05	android:layout_width="fill_parent"

06	android:layout_height="fill_parent">

07

08

<ListView

09	android:id="@+id/android:list"

10	android:layout_width="fill_parent"

11	android:layout_height="fill_parent">

12	</ListView>

13	</LinearLayout>

File: DemoList.java

001	import java.util.ArrayList;

002	import android.app.ListActivity;

003	import android.content.Intent;

004	import android.content.res.Configuration;

005	import android.os.Bundle;

006	import android.util.Log;

007	import android.view.View;

008	import android.widget.AdapterView;

009	import android.widget.ArrayAdapter;

010	import android.widget.ListView;

011	import android.widget.Toast;

012	import android.widget.AdapterView.OnItemClickListener;

013

014	public class DemoList extends ListActivity implements OnItemClickListener

015

{

016	private static final String tag = "DemoList";

017	private ListView listview;

018	private ArrayAdapter<String> listAdapter;

019

020	// Want to pass data values as parameters to next Activity/View/Page

021	private String params;

022

023	// Our data for plotting

024	private final double[][] data = { { 1, 1.0 }, { 2.0, 4.0 }, { 3.0, 10.0 }, { 4, 2.0 }, { 5.0, 20 }, { 6.0, 4.0 }, { 7.0, 1.0 }, };

025

026

@Override

027	public void onCreate(Bundle savedInstanceState)

028

{

029	super.onCreate(savedInstanceState);

030

031	// Set the View Layer

032	setContentView(R.layout.data_listview);

033

034	// Get the Default declared ListView @android:list

035	listview = getListView();

036

037	// List for click events to the ListView items

038	listview.setOnItemClickListener(this);

039

040	// Get the data to

041	ArrayList<String> dataList = getDataStringList(data);

042

043	// Create an Adapter to for viewing the ListView

044	listAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, dataList);

045

046	// Bind the adapter to the ListView

047	listview.setAdapter(listAdapter);

048

049	// Set the parameters to pass to the next view/ page

050	setParameters(data);

051

}

052

053	private String doubleArrayToString(double[][] dataVals)

054

{

055	StringBuilder strBuilder = new StringBuilder();

056	for (int i = 0; i < dataVals.length; i++)

057

{

058	String datum = "[" + String.valueOf(dataVals[i][0]) + "," + String.valueOf(dataVals[i][1]) + "]";

059

060	if (i < dataVals.length - 1)

061

{

062	strBuilder.append(datum + " , ");

063

}

064

else

065

{

066	strBuilder.append(datum);

067

}

068

}

069	return strBuilder.toString();

070

}

071

072

/**

073	* Sets parameters for the Bundle

074

*

075	* @param dataList

076

*/

077	private void setParameters(double[][] dataVals)

078

{

079	params = toJSON(dataVals);

080

}

081

082	public String getParameters()

083

{

084	return this.params;

085

}

086

087

/**

088	* Need todo JSONArray

089

*

090	* @param dataVals

091

* @return

092

*/

093	private String toJSON(double[][] dataVals)

094

{

095	StringBuilder strBuilder = new StringBuilder();

096

097	strBuilder.append("[");

098	strBuilder.append(doubleArrayToString(dataVals));

099	strBuilder.append("]");

100	return strBuilder.toString();

101

}

102

103

/**

104

*

105	* @param dataVals

106

* @return

107

*/

108	private ArrayList<String> getDataStringList(double[][] dataVals)

109

{

110	ArrayList<String> list = new ArrayList<String>();

111

112	// TODO: CONVERT INTO JSON FORMAT

113	for (int i = 0; i < dataVals.length; i++)

114

{

115	String datum = "[" + String.valueOf(dataVals[i][0]) + "," + String.valueOf(dataVals[i][1]) + "]";

116	list.add(datum);

117

}

118	return list;

119

}

120

121

@Override

122	public void onConfigurationChanged(Configuration newConfig)

123

{

124	super.onConfigurationChanged(newConfig);

125

126	// Create an Intent to switch view to the next page view

127	Intent intent = new Intent(this, DemoCharts.class);

128

129	// Pass parameters along to the next page

130	intent.putExtra("param", getParameters());

131

132	// Start the activity

133	startActivity(intent);

134

135	Log.d(tag, "Orientation Change...");

136	Log.d(tag, "Params: " + getParameters());

137

}

138

139

@Override

140	public void onItemClick(AdapterView<?> parent, View view, int position, long duration)

141

{

142	// Upon clicking item in list pop a toast

143	String msg = "#Item: " + String.valueOf(position) + " - " + listAdapter.getItem(position);

144	Toast.makeText(getApplicationContext(), msg, Toast.LENGTH_LONG).show();

145

}

146

}

File: DemoCharts.java

001	import java.util.ArrayList;

002

003	import net.droidsolutions.droidcharts.core.data.XYDataset;

004	import net.droidsolutions.droidcharts.core.data.xy.XYSeries;

005	import net.droidsolutions.droidcharts.core.data.xy.XYSeriesCollection;

006	import android.app.Activity;

007	import android.content.Intent;

008	import android.content.res.Configuration;

009	import android.os.Bundle;

010	import android.util.Log;

011	import android.widget.Toast;

012

013	public class DemoCharts extends Activity

014

{

015	private static final String tag = "DemoCharts";

016	private final String chartTitle = "My Daily Starbucks Allowance";

017	private final String xLabel = "Week Day";

018	private final String yLabel = "Allowance";

019

020	/** Called when the activity is first created. */

021

@Override

022	public void onCreate(Bundle savedInstanceState)

023

{

024	super.onCreate(savedInstanceState);

025

026	// Access the Extras from the Bundle

027	Bundle params = getIntent().getExtras();

028

029	// If we get no parameters, we do nothing

030	if (params == null) { return; }

031

032	// Get the passed parameter values

033	String paramVals = params.getString("param");

034

035	Log.d(tag, "Data Param:= " + paramVals);

036	Toast.makeText(getApplicationContext(), "Data Param:= " + paramVals, Toast.LENGTH_LONG).show();

037

038	ArrayList<ArrayList<Double>> dataVals = stringArrayToDouble(paramVals);

039

040	XYDataset dataset = createDataset("My Daily Starbucks Allowance", dataVals);

041	XYLineChartView graphView = new XYLineChartView(this, chartTitle, xLabel, yLabel, dataset);

042	setContentView(graphView);

043

}

044

045	private String arrayToString(String[] data)

046

{

047	StringBuilder strBuilder = new StringBuilder();

048	for (int i = 0; i < data.length; i++)

049

{

050	strBuilder.append(data[i]);

051

}

052	return strBuilder.toString();

053

}

054

055	private String cleanNumericString(String val)

056

{

057	return val.replaceAll("\\[", "").replaceAll("\\]", "").trim();

058

}

059

060	private ArrayList<ArrayList<Double>> stringArrayToDouble(String paramVals)

061

{

062	ArrayList<ArrayList<Double>> plotVals = new ArrayList<ArrayList<Double>>();

063	if (paramVals.startsWith("[") && paramVals.endsWith("]"))

064

{

065	String[] vals = paramVals.substring(1, paramVals.length() - 1).split(" , ");

066	for (String v : vals)

067

{

068	if (v.startsWith("[") && v.endsWith("]"))

069

{

070	String[] dataVals = v.split(",");

071

072	String xvalStr = cleanNumericString(dataVals[0]);

073	String yvalStr = cleanNumericString(dataVals[1]);

074	Log.d(paramVals, xvalStr + " - " + yvalStr);

075

076	// Convert to Numeric Values

077	Double x = Double.parseDouble(xvalStr);

078	Double y = Double.parseDouble(yvalStr);

079

080	// Create (x,y) tuple for data point

081	ArrayList<Double> list1 = new ArrayList<Double>();

082	list1.add(x);

083	list1.add(y);

084

085	// Add to our final list

086	plotVals.add(list1);

087

}

088	Log.d(tag, "Values to plot: " + plotVals.toString());

089

}

090

}

091	return plotVals;

092

}

093

094

/**

095	* Creates a sample dataset.

096

*

097	* @return a sample dataset.

098

*/

099	private XYDataset createDataset(String title, ArrayList<ArrayList<Double>> dataVals)

100

{

101	final XYSeries series1 = new XYSeries(title);

102	for (ArrayList<Double> tuple : dataVals)

103

{

104	double x = tuple.get(0).doubleValue();

105	double y = tuple.get(1).doubleValue();

106

107	series1.add(x, y);

108

}

109

110	// Create a collection to hold various data sets

111	final XYSeriesCollection dataset = new XYSeriesCollection();

112	dataset.addSeries(series1);

113	return dataset;

114

}

115

116

@Override

117	public void onConfigurationChanged(Configuration newConfig)

118

{

119	super.onConfigurationChanged(newConfig);

120	Toast.makeText(this, "Orientation Change", Toast.LENGTH_SHORT);

121

122	// Lets get back to our DemoList view

123	Intent intent = new Intent(this, DemoList.class);

124	startActivity(intent);

125

126	// Finish current Activity

127	this.finish();

128

}

129

}