How to Create simple Alert Dialog
public class Home extends Activity {
Button btnAlert, btnDate, btnTime, btnCustom;
final int D_ALERT = 1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
initialize();
btnAlert.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showDialog(D_ALERT);
}
});
btnDate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
DatePickerDialog date = new DatePickerDialog(Home.this,
new DateListener(), 2012, 7, 1);
date.show();
}
});
btnTime.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
TimePickerDialog time = new TimePickerDialog(Home.this,
new TimeListener(), 17, 45, false);
time.show();
}
});
btnCustom.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
final Dialog dialog = new Dialog(Home.this);
dialog.setContentView(R.layout.cus_lay);
dialog.setTitle("BitCode");
final EditText edtUsername = (EditText) dialog
.findViewById(R.id.edtUsername);
Button btnLogin = (Button) dialog.findViewById(R.id.btnLogin);
btnLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (edtUsername.getText().toString().equals("bitcode")) {
mt("login success");
dialog.dismiss();
} else {
mt("something wrong");
}
}
});
dialog.show();
}
});
}
class TimeListener implements OnTimeSetListener {
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
btnTime.setText("hh: " + hourOfDay + " mi: " + minute);
}
}
class DateListener implements OnDateSetListener {
@Override
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
btnDate.setText(dayOfMonth + " - " + (monthOfYear + 1) + " - "
+ year);
}
}
@Override
protected Dialog onCreateDialog(int id) {
mt("onCreateDialog called...");
if (id == D_ALERT) {
AlertDialog aDialog;
AlertDialog.Builder builder = new AlertDialog.Builder(Home.this);
builder.setTitle("BitCode");
builder.setMessage("Are you sure?");
builder.setIcon(R.drawable.ic_launcher);
builder.setPositiveButton("Yes", new YesListener());
builder.setNegativeButton("No", new YesListener());
builder.setCancelable(false);
aDialog = builder.create();
return aDialog;
}
return super.onCreateDialog(id);
}
@Override
protected void onPrepareDialog(int id, Dialog dialog) {
mt("onPrepareDialog dialog called for id " + id);
if (id == D_ALERT) {
((AlertDialog) dialog).setMessage("this is a change message");
}
}
class YesListener implements DialogInterface.OnClickListener {
@Override
public void onClick(DialogInterface dialog, int which) {
if (which == DialogInterface.BUTTON_POSITIVE)
mt("you said yes");
if (which == DialogInterface.BUTTON_NEGATIVE)
mt("you said no");
dialog.dismiss();
}
}
private void mt(String text) {
Toast.makeText(this, text, Toast.LENGTH_SHORT).show();
}
private void initialize() {
btnAlert = (Button) findViewById(R.id.btnAlert);
btnDate = (Button) findViewById(R.id.btnDate);
btnTime = (Button) findViewById(R.id.btnTime);
btnCustom = (Button) findViewById(R.id.btnCustom);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_home, menu);
return true;
}
}
activity_home xml file:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="@+id/btnAlert"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Alert Dialog" />
<Button
android:id="@+id/btnDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Pick Date" />
<Button
android:id="@+id/btnTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Pick Time" />
<Button
android:id="@+id/btnCustom"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Custom Dialog" />
</LinearLayout>
cus_lay xml file:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ImageView android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:src="@drawable/ic_launcher"/>
<EditText android:layout_width="100px"
android:layout_height="wrap_content"
android:id="@+id/edtUsername"
android:hint="username"/>
<EditText android:layout_width="100px"
android:layout_height="wrap_content"
android:id="@+id/edtPassword"
android:hint="password" android:password="true"/>
<Button android:layout_width="fill_parent" android:layout_height="wrap_content"
android:id="@+id/btnLogin" android:text="Login"/>
</LinearLayout>
