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Capter 13. Thread Demo 1 Progress Bar

List program

ThreadDemo1ProgressBarActivity.java

package app.seamolec;

import java.util.Random;

import android.app.Activity;

import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.View;

import android.widget.ProgressBar;import android.widget.TextView;public class ThreadDemo1ProgressBarActivity extends Activity {

ProgressBar bar1;ProgressBar bar2;

TextView msgWorking;TextView msgReturned;

boolean isRunning= false;final int MAX_SEC= 60; // (seconds) lifetime for background thread

String strTest= "global value seen by all threads ";int intTest= 0;

Handler handler= new Handler() {

public void handleMessage(Message msg) {

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String returnedValue= (String)msg.obj;//do something with the value sent by the background thread here ...

msgReturned.setText("returned by background thread: \n\n"+ returnedValue);bar1.incrementProgressBy(2);//testing threads termination

if(bar1.getProgress() == MAX_SEC){msgReturned.setText("Done \n back thread has been stopped");isRunning= false;

}if(bar1.getProgress() == bar1.getMax()){msgWorking.setText("Done");bar1.setVisibility(View.INVISIBLE);

bar2.setVisibility(View.INVISIBLE);

}else{msgWorking.setText("Working..."+bar1.getProgress() );

}

}}; //handler

@Overridepublic void onCreate(Bundle icicle) {super.onCreate(icicle);

setContentView(R.layout.main);bar1= (ProgressBar) findViewById(R.id.progress);

bar2= (ProgressBar) findViewById(R.id.progress2);

bar1.setMax(MAX_SEC);bar1.setProgress(0);msgWorking= (TextView)findViewById(R.id.TextView01);msgReturned= (TextView)findViewById(R.id.TextView02);

strTest+= "-01"; // slightly change the global stringintTest= 1;}//onCreate

public void onStop() {super.onStop();isRunning= false;}

public void onStart() {super.onStart();// bar1.setProgress(0);

Thread background = new Thread(new Runnable() {public void run() {

try{

for(int i = 0; i < MAX_SEC && isRunning; i++) {//try a Toast method here (will not work!)

//fake busy busywork hereThread.sleep(1000); //one second at a time

Random rnd= new Random();// this is a locally generated value

String data = "Thread Value: "+ (int) rnd.nextInt(101);//we can see and change (global) class variables

data += "\n"+ strTest+ " "+ intTest;

intTest++;

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//request a message token and put some data in itMessage msg= handler.obtainMessage(1, (String)data);

// if thread is still alive send the messageif(isRunning) {handler.sendMessage(msg);}

}} catch(Throwable t) {// just end the background thread

}}//run});//backgroundisRunning= true;

background.start();

}//onStart} //class

Main.xlm

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CAPTER 13. Threads Posting

ThreadsPostingActivity.java

package app.seamolec;

import android.app.Activity;import android.os.Bundle;

import android.os.Handler;import android.text.Editable;

import android.text.style.BackgroundColorSpan;import android.view.View;

import android.widget.Button;import android.widget.EditText;import android.widget.ProgressBar;

import android.widget.TextView;import android.widget.Toast;

public class ThreadsPostingActivity extends Activity {private static final Runnable BackgroundTask = null;ProgressBar myBar;TextView lblTopCaption;

EditText txtBox1;Button btnDoSomething;int accum=0;long startingMills = System.currentTimeMillis();

String PATIENCE= "Some important data is been collected now. "+

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"\nPleasebe patient. ";Handler myHandler= new Handler();

/** Called when the activity is first created. */@Overridepublic void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);lblTopCaption = (TextView)findViewById(R.id.lblTopCaption);

myBar = (ProgressBar) findViewById(R.id.txtBox1);txtBox1.setMaxEms(100);txtBox1= (EditText) findViewById(R.id.txtBox1);txtBox1.setHint("Foreground distraction. Enter some data here");

btnDoSomething= (Button)findViewById(R.id.btnDoSomething);

btnDoSomething.setOnClickListener(new OnClickListener() {

public void onClick(View v) {Editable txt = txtBox1.getText();

Toast.makeText(getBaseContext(), "You said >> "+ txt, 1).show();

}//onClick});//setOnClickListener

}//onCreate

protected void onStart() {super.onStart();

// create background thread were the busy work will be doneThread myThread1 = new Thread(BackgroundTask, "backAlias1");

myThread1.start();

myBar.incrementProgressBy(0);}// this is the foreground "Runnable" object responsible for GUI updatesprivate Runnable foregroundTask= new Runnable() {

public void run() {try{

int progressStep= 5;lblTopCaption.setText(PATIENCE+ "\nTotalsec. so far: "+(System.currentTimeMillis() -startingMills) / 1000 );myBar.incrementProgressBy(progressStep);

accum+= progressStep;if(accum>= myBar.getMax()){lblTopCaption.setText("Background work is OVER!");

myBar.setVisibility(View.INVISIBLE);}

} catch(Exception e) {

e.printStackTrace();}

}//run

};

//this is the "Runnable" object that executes the background threadprivate Runnable backgroundTask= new Runnable() {

public void run() {

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//busy work goes here...try{

for(int n=0; n

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android:layout_height="wrap_content"android:padding="4px"

android:layout_marginLeft="20px"android:text="Do Something"/>

CAPTER 14. Preference1Activity

Preference1Activity.java

package app.seamolec;

import java.util.Date;

import android.app.Activity;

import android.content.SharedPreferences;

import android.content.SharedPreferences.Editor;

import android.os.Bundle;

import android.widget.EditText;

import android.widget.TextView;

publicclass Preference1Activity extends Activity {

publicstaticfinal StringMYPREFS = "MySharedPreferences001";//this data values describe a typical customer record

String custName = "n.a.";intcustAge = 0;

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floatcustCredit = 0;

longcustNumber = 0;

String custDateLastCall;TextView captionBox;EditText txtPref;finalintmode = Activity.MODE_PRIVATE;

publicvoid onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);

setContentView(R.layout.main);txtPref = (EditText)findViewById(R.id.txtPref);captionBox = (TextView) findViewById(R.id.captionBox);captionBox.setText("SharedPreference Container: \n\n"+

"we are working on customer Macarena \n" +

"fake an interruption, press 'Back Button' \n" +"re-execute the application.");//create a reference to the shared preferences objectint mode = Activity.MODE_PRIVATE;

SharedPreferences mySharedPreferences = getSharedPreferences(MYPREFS,

mode); // is there an existing Preferences from previous executions of this

app?if (mySharedPreferences != null &&mySharedPreferences.contains("custName")) {//object and key found, show all saved values

showSavedPreferences();}

else

{txtPref.setText("nada");}}//onCreate

protectedvoid onPause() {//warning: activity is on last state of visibility! We are on the//edge of been killed! Better save current state in Preference object

savePreferences();super.onPause();}protectedvoid savePreferences(){

//create the shared preferences objectSharedPreferences mySharedPreferences = getSharedPreferences(MYPREFS,

mode);

//obtain an editor to add data to (my)SharedPreferences objectSharedPreferences.Editor myEditor = mySharedPreferences.edit();

//put some data in the preferences objectmyEditor.putString("custName", "Maria Macarena");

myEditor.putInt("custAge", 21);myEditor.putFloat("custCredit", 1500000.00F);

myEditor.putLong("custNumber", 9876543210L);myEditor.putString("custDateLastCall", new Date().toLocaleString());

myEditor.commit();}

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publicvoid showSavedPreferences() {//retrieve the SharedPreferences object

SharedPreferences mySharedPreferences =getSharedPreferences(MYPREFS, mode);//extract the pairs, use default param for missing

data

custName = mySharedPreferences.getString("custName","defNameValue");custAge = mySharedPreferences.getInt("custAge", 18);

custCredit = mySharedPreferences.getFloat("custCredit",1000.00F);

custNumber = mySharedPreferences.getLong("custNumber", 1L);custDateLastCall =

mySharedPreferences.getString("custDateLastCall",

new Date().toLocaleString());

//show saved data on screenString msg = "name: " + custName + "\nAge: " + custAge +

"\nCredit: " + custCredit +

"\nLastCall: " + custDateLastCall;txtPref.setText(msg);

}//loadPreferences}//Preferences1

main.xml

CAPTER 14. Preference Demo

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PreverenceDemoOActivity.java

package app.seamolec;

import java.sql.Date;

import android.app.Activity;import android.content.SharedPreferences;

import android.graphics.Color;

import android.graphics.Typeface;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;

import android.widget.Button;import android.widget.TextView;

import android.widget.Toast;

import app.seamolec.nila.R;

public class PreferenceDemo0Activity extends Activity implements OnClickListener {/** Called when the activity is first created. */

Button btnSimplePref;

Button btnFancyPref;

TextView txtCaption1;Boolean fancyPrefChosen = false;View myLayout1Vertical;final int mode = Activity.MODE_PRIVATE;

final String MYPREFS = "MyPreferences_001";// create a reference to the shared preferences objectSharedPreferences mySharedPreferences;

// obtain an editor to add data to my SharedPreferences objectSharedPreferences.Editor myEditor;

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@Override

public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);myLayout1Vertical = (View)findViewById(R.id.linLayout1Vertical);

txtCaption1 = (TextView) findViewById(R.id.txtCaption1);txtCaption1.setText("This is a sample line \n"+ "suggesting the way the UI looks \n"

+ "after you choose your preference");// create a reference & editor for the shared preferences objectmySharedPreferences = getSharedPreferences(MYPREFS, 0);myEditor = mySharedPreferences.edit();

// has a Preferences file been already created?

if (mySharedPreferences != null&& mySharedPreferences.contains("backColor")) {// object and key found show all saved values

applySavedPreferences();

} else {Toast.makeText(getApplicationContext(),

"No Preferences found", 1).show();}btnSimplePref = (Button) findViewById(R.id.btnPrefSimple);btnSimplePref.setOnClickListener(this);

btnFancyPref = (Button) findViewById(R.id.btnPrefFancy);btnFancyPref.setOnClickListener(this);

}

@Overridepublic void onClick(View v) {

// clear all previous selectionsmyEditor.clear();// what button has been clicked?

if (v.getId() == btnSimplePref.getId()) {myEditor.putInt("backColor", Color.BLACK);// black backgroundmyEditor.putInt("textSize", 12); // humble small font} else { // case btnFancyPref

myEditor.putInt("backColor", Color.BLUE); // fancy bluemyEditor.putInt("textSize", 20); // fancy bigmyEditor.putString("textStyle", "bold"); // fancy bold

myEditor.putInt("layoutColor", Color.GREEN);//fancy green}

myEditor.commit();applySavedPreferences();

}protected void onPause() {

// warning: activity is on its last state of visibility!.// It's on the edge of been killed! Better save all current

// state data into Preference object (be quick!)myEditor.putString("DateLastExecution", new Date(0).toLocaleString());

myEditor.commit();

super.onPause();

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}

public void applySavedPreferences() {// extract the pairs, use default param for missing dataint backColor = mySharedPreferences.getInt("backColor",Color.BLACK);int textSize = mySharedPreferences.getInt("textSize", 12);

String textStyle = mySharedPreferences.getString("textStyle", "normal");int layoutColor = mySharedPreferences.getInt("layoutColor",Color.DKGRAY);

String msg = "color " + backColor + "\n"+ "size " + textSize + "\n"+ "style " + textStyle;Toast.makeText(getApplicationContext(), msg, 1).show();

txtCaption1.setBackgroundColor(backColor);

txtCaption1.setTextSize(textSize);if (textStyle.compareTo("normal")==0){

txtCaption1.setTypeface(Typeface.SERIF,Typeface.NORMAL);

}

else {txtCaption1.setTypeface(Typeface.SERIF,Typeface.BOLD);

}myLayout1Vertical.setBackgroundColor(layoutColor);}// applySavedPreferences}

// TODO Auto-generated method stub

main.xml

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android:id="@+id/txtCaption1"android:layout_width="fill_parent"

android:layout_height="wrap_content"android:background="#ff006666"android:text="This is some sample text "/>

CAPTER 15. Demo

DemoActivity extends.java

package app.seamolec;

import java.io.BufferedReader;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import android.app.Activity;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.Toast;

import app.seamolec.nila.R;

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public class DemoActivity extends Activity {

private final static String NOTES="notes.txt";

private EditText editor;

public void onCreate(Bundle icicle) {

super.onCreate(icicle);setContentView(R.layout.main);

editor=(EditText)findViewById(R.id.editor);

Button btn=(Button)findViewById(R.id.close);

btn.setOnClickListener(new Button.OnClickListener() {

public void onClick (View v) {

finish();

}

});

}//onCreatepublic void onResume() {

super.onResume();

try{

InputStream in=openFileInput(NOTES);

if(in!=null) {

InputStreamReader tmp=new InputStreamReader(in);

BufferedReader reader=new BufferedReader(tmp);

String str;

StringBuffer buf=new StringBuffer();

while((str= reader.readLine()) != null) {

buf.append(str+"\n");}

in.close();

editor.setText(buf.toString());

}//if

}

catch(java.io.FileNotFoundException e) {

// that's OK, we probably haven't created it yet

}

catch(Throwable t) {

Toast.makeText(this, "Exception: "+ t.toString(), 2000).show();

}

}

public void onPause() {

super.onPause();

try{

OutputStreamWriter out=

new OutputStreamWriter(openFileOutput(NOTES, 0));

out.write(editor.getText().toString());

out.close();

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}

catch(Throwable t) {

Toast.makeText(this, "Exception: "+ t.toString(), 2000).show();

}

}

}//class

main.xml

CAPTER 15. Demo

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FileDemo3SDActivity.java

package app.seamolec;

import java.io.File;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.FileWriter;

import java.io.IOException;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.sql.Date;

import java.util.Scanner;

import android.app.Activity;

import android.os.Bundle;

import android.os.Environment;

import android.view.View;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

import android.widget.Toast;

import app.seamolec.nila.R;

public class FileDemo3SDActivity extends Activity {

// GUI controls

EditText txtData;

Button btnWriteSDFile;

Button btnReadSDFile;

Button btnClearScreen;

Button btnClose;

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public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

// bind GUI elements with local controls

txtData= (EditText) findViewById(R.id.txtData);txtData.setHint("Enter some lines of data here...");

btnWriteSDFile= (Button) findViewById(R.id.btnWriteSDFile);

btnWriteSDFile.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

try{

File myFile= new File("/sdcard/mysdfile.txt");

myFile.createNewFile();

FileOutputStream fOut= new FileOutputStream(myFile);

OutputStreamWriter myOutWriter= new OutputStreamWriter(fOut);

myOutWriter.append(txtData.getText());myOutWriter.close();

fOut.close();

Toast.makeText(getBaseContext(),

"Done writing SD 'mysdfile.txt'", Toast.LENGTH_SHORT).show();

} catch(Exception e) {

} Throwable e = null;

Toast.makeText(getBaseContext(),

e.getMessage(), Toast.LENGTH_SHORT).show();

}// onClick

});

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

public void onClick(View v) {

// clear text box

txtData.setText("");

}

}); // btnClearScreen

btnClose= (Button) findViewById(R.id.btnClose);

btnClose.setOnClickListener(new OnClickListener() {

public void onClick(View v) {

// clear text box

finish();

}

}); // btnClose

}// onCreate

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private void testScannerFiles(){

// Add to manifest the following permission request

//

TextView tvMessage = null;

try{String SDcardPath= Environment.getExternalStorageDirectory().getPath();

String mySDFileName= SDcardPath+ "/"+ "mysdfiletest.txt";

tvMessage.setText("Writing to: "+ mySDFileName);

PrintWriter outfile= new PrintWriter( new FileWriter(mySDFileName) );

outfile.println("HolaAndroid");

outfile.println("Adios Android");

outfile.println(new Date(0).toString());

outfile.close();

// read SD-file,showrecords.

Scanner infile= new Scanner(new FileReader(mySDFileName));

String inString= "\n\nReadingfrom: "+ mySDFileName+ "\n";

while(infile.hasNextLine()) {inString+= infile.nextLine() + "\n";

}

tvMessage.append(inString);

infile.close();

} catch(FileNotFoundException e) {

tvMessage.setText( "Error: "+ e.getMessage());

} catch(IOException e) {

tvMessage.setText( "Error: "+ e.getMessage());

}

}

}

main.xml

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android:layout_width="143px"android:layout_height="44px"

android:text="1. Write SD File"/>