MainAcitivity.java
package com.example.myfirstapp;
import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;
import android.util.Log;
import android.app.ProgressDialog;
import android.content.Intent;
public class MainActivity extends Activity {
String tag = "Lifecycle";
CharSequence[] items = { "Google", "Apple", "Microsoft" };
boolean[] itemsChecked = new boolean [items.length];
ProgressDialog progressDialog;
int request_Code = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
public void onStart()
{
super.onStart();
Log.d(tag, "In the onStart() event");
}
public void onRestart()
{
super.onRestart();
Log.d(tag, "In the onRestart() event");
}
public void onResume()
{
super.onResume();
Log.d(tag, "In the onResume() event");
}
public void onPause()
{
super.onPause();
Log.d(tag, "In the onPause() event");
}
public void onClick(View v) {
showDialog(0);
}
public void onClick2(View v) {
//---show the dialog---
final ProgressDialog dialog = ProgressDialog.show(
this, "Doing something", "Please wait...", true);
new Thread(new Runnable(){
public void run(){
try {
//---simulate doing something lengthy---
Thread.sleep(5000);
//---dismiss the dialog---
dialog.dismiss();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}).start();
}
public void onClick3(View v) {
showDialog(1);
progressDialog.setProgress(0);
new Thread(new Runnable(){
public void run(){
for (int i=1; i<=15; i++) {
try {
//---simulate doing something lengthy---
Thread.sleep(1000);
//---update the dialog---
progressDialog.incrementProgressBy((int)(100/15));
} catch (InterruptedException e) {
e.printStackTrace();
}
}
progressDialog.dismiss();
}
}).start();
}
public void onClick4(View view) {
startActivityForResult(new Intent("com.example.myfirstapp.SecondActivity"),request_Code);
}
public void onActivityResult(int requestCode, int resultCode, Intent data)
{
if (requestCode == request_Code) {
if (resultCode == RESULT_OK) {
Toast.makeText(this, Integer.toString(
data.getIntExtra("age3", 0)),
Toast.LENGTH_SHORT).show();
//---get the result using getData()---
Toast.makeText(this, data.getData().toString(),
Toast.LENGTH_SHORT).show();
}
}
}
public void onClick5(View view) {
Intent i = new
Intent("com.example.myfirstapp.MainActivity");
//---use putExtra() to add new name/value pairs---
i.putExtra("str1", "This is a string");
i.putExtra("age1", 25);
//---use a Bundle object to add new name/values
// pairs---
Bundle extras = new Bundle();
extras.putString("str2", "This is another string");
extras.putInt("age2", 35);
//---attach the Bundle object to the Intent object---
i.putExtras(extras);
//---start the activity to get a result back---
startActivityForResult(i, 1);
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case 0:
return new AlertDialog.Builder(this)
.setIcon(R.drawable.ic_launcher)
.setTitle("This is a dialog with some simple text...")
.setPositiveButton("OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton)
{
Toast.makeText(getBaseContext(),
"OK clicked!", Toast.LENGTH_SHORT).show();
}
}
)
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton)
{
Toast.makeText(getBaseContext(),
"Cancel clicked!", Toast.LENGTH_SHORT).show();
}
}
)
.setMultiChoiceItems(items, itemsChecked,
new DialogInterface.OnMultiChoiceClickListener() {
public void onClick(DialogInterface dialog,
int which, boolean isChecked) {
Toast.makeText(getBaseContext(),
items[which] + (isChecked ? " checked!":" unchecked!"),
Toast.LENGTH_SHORT).show();
}
}
).create();
case 1:
progressDialog = new ProgressDialog(this);
progressDialog.setIcon(R.drawable.ic_launcher);
progressDialog.setTitle("Downloading files...");
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setButton(DialogInterface.BUTTON_POSITIVE, "OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton){
Toast.makeText(getBaseContext(),
"OK clicked!", Toast.LENGTH_SHORT).show();
}
});
progressDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton)
{
Toast.makeText(getBaseContext(),
"Cancel clicked!", Toast.LENGTH_SHORT).show();
}
});
return progressDialog;
}
return null;
}
}
SecondAcitivity.java
package com.example.myfirstapp;
import android.app.Activity;
import android.os.Bundle;
import android.content.Intent;
import android.net.Uri;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class SecondActivity extends Activity{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.secondactivity);
//---get the data passed in using getStringExtra()---
Toast.makeText(this,getIntent().getStringExtra("str1"),
Toast.LENGTH_SHORT).show();
//---get the data passed in using getIntExtra()---
Toast.makeText(this,Integer.toString(
getIntent().getIntExtra("age1", 0)),
Toast.LENGTH_SHORT).show();
//---get the Bundle object passed in---
Bundle bundle = getIntent().getExtras();
//---get the data using the getString()---
Toast.makeText(this, bundle.getString("str2"),
Toast.LENGTH_SHORT).show();
//---get the data using the getInt() method---
Toast.makeText(this,Integer.toString(bundle.getInt("age2")),
Toast.LENGTH_SHORT).show();
}
public void onClick(View view) {
Intent data = new Intent();
//---get the EditText view---
EditText txt_username =
(EditText) findViewById(R.id.txt_username);
//---set the data to pass back---
data.setData(Uri.parse(txt_username.getText().toString()));
setResult(RESULT_OK, data);
//---closes the activity---
finish();
}
public void onClick2(View view) {
//---use an Intent object to return data---
Intent i = new Intent();
//---use the putExtra() method to return some
// value---
i.putExtra("age3", 45);
//---use the setData() method to return some value---
i.setData(Uri.parse(
"Something passed back to main activity"));
//---set the result with OK and the Intent object---
setResult(RESULT_OK, i);
//---destroy the current activity---
finish();
}
}
res/layout/acitivity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Button
android:id="@+id/btn_dialog"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="onClick"
android:text="Click to display a dialog" />
<Button
android:id="@+id/btn_dialog2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="onClick2"
android:text="Click to display a progress dialog" />
<Button
android:id="@+id/btn_dialog3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="onClick3"
android:text="Click to display a detailed progress dialog" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="onClick5"
android:text="Display second activity" />
</LinearLayout>
secondactivity.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:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="This is the Second Activity!" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Please enter your name" />
<EditText
android:id="@+id/txt_username"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/btn_OK"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="OK click to return to main activity"
android:onClick="onClick2"/>
</LinearLayout>
androidmanifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myfirstapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.myfirstapp.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:label="Second Activity" android:name="com.example.myfirstapp.SecondActivity" >
<intent-filter >
<action android:name="com.example.myfirstapp.MainActivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
thanks to this book & my dear friend dharma for providing me book and having confidence in me
Android™ 4 Application Development
Wei-Meng Lee
