Android Series: Creating custom dialogs

Android Series: Creating custom dialogs

Every android developer will face one day a need to create a custom dialog, where the user has to input some data for processing or any other purposes. This post is a short tutorial on how to create a custom dialog in android, dimming the background activity and asking user to input a string for a search query.
Custom dialog is implemented as another activity and treated as dialog by using special option in AndroidManifest.xml (listed at the end of this post).
The whole application consists of two activities (main + custom dialog), two small layout xml files and a modified AndroidManifest.xml.


AndroDialog (main activity)

package com.softwarepassion;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class AndroDialog extends Activity {

private Button startDialogBtn;
private static final int MY_CUSTOM_DIALOG = 0;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
startDialogBtn = (Button)findViewById(R.id.startdialog);
startDialogBtn.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
startCustomDialog();
}
});
}

/**
* Starts an Activity which in this case is a custom
* dialog, as specified in AndroidManifest.xml
*/

private void startCustomDialog() {
Intent intent = new Intent(this,SearchDialog.class);
startActivityForResult(intent, MY_CUSTOM_DIALOG);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch(requestCode) {
case (MY_CUSTOM_DIALOG) : {
if (resultCode == Activity.RESULT_OK) {
Log.d("ANDRO_DIALOG","Coming back from the search dialog..");
String searchQuery = data.getStringExtra(SearchDialog.SEARCH_QUERY_RESULT_FROM_DIALOG);
Log.d("ANDRO_DIALOG", "Search query result: " + searchQuery);
}
break;
}
}
}
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello"
    />
<Button android:text="Show Custom Dialog"
    android:id="@+id/startdialog"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">
</Button>
</LinearLayout>

SearchDialog.java (custom dialog activity)

package com.softwarepassion;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;

public class SearchDialog extends Activity{

public static final String SEARCH_QUERY_RESULT_FROM_DIALOG = "SEARCH_DIALOG";
private Button searchBtn;
private Button cancelBtn;
private EditText searchEdit;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_dialog);
searchBtn = (Button)findViewById(R.id.search);
searchBtn.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
returnSearchQuery();
}
});
cancelBtn = (Button)findViewById(R.id.cancel);
cancelBtn.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
cancelDialog();
}
});
searchEdit = (EditText)findViewById(R.id.search_query);
searchEdit.setText("query");
getWindow().setFlags(WindowManager.LayoutParams.FLAG_BLUR_BEHIND,
WindowManager.LayoutParams.FLAG_BLUR_BEHIND);

}
private void returnSearchQuery(){
Intent resultIntent = new Intent(this, SearchDialog.class);
resultIntent.putExtra(SEARCH_QUERY_RESULT_FROM_DIALOG, searchEdit.getText().toString());
setResult(Activity.RESULT_OK, resultIntent);
finish();
}
private void cancelDialog(){
finish();
}
}

custom dialog xml layout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:id="@+id/layout_root"
              android:orientation="vertical"
              android:layout_width="fill_parent"
              android:layout_height="fill_parent"
              android:padding="10dp">
    <EditText android:id="@+id/search_query"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"/>
    <LinearLayout android:orientation="horizontal"
    android:background="@android:drawable/bottom_bar" android:paddingLeft="4.0dip"
    android:paddingTop="5.0dip" android:paddingRight="4.0dip"
    android:paddingBottom="1.0dip" android:layout_width="fill_parent"
    android:layout_height="wrap_content">
    <Button android:id="@+id/search" android:layout_width="0.0dip"
        android:layout_height="fill_parent" android:text="Search"
        android:layout_weight="1.0" />
    <Button android:id="@+id/cancel" android:layout_width="0.0dip"
        android:layout_height="fill_parent" android:text="Cancel"
        android:layout_weight="1.0" />
</LinearLayout>
</LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.softwarepassion"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".AndroDialog"
                  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:name="SearchDialog"
          android:label="Search Dialog"
          android:theme="@android:style/Theme.Dialog"/>
    </application>
</manifest>

Hope this helps anyone needing to write a custom dialog for the android platform.

9 responses on “Android Series: Creating custom dialogs

  1. Daneel_87 February 3, 2011 at 3:30 pm

    maybe too small those XML files 😀

  2. admin February 3, 2011 at 3:58 pm

    🙂 Thanks Daneel!

  3. Sandeep March 18, 2011 at 8:23 am

    Very helpful.. Thanks:)

  4. SS123 October 12, 2011 at 2:55 pm

    Hi, The example looks great.
    But is there a way i can remove the white boder of this custom dialog.
    I need to design exactly similar screen, with no border in it.

  5. Ulf February 8, 2012 at 11:25 am

    Thank you,
    just what I was looking for.

  6. Björn February 18, 2012 at 4:10 pm

    Very good! Much better approach to have an entire Activity for the dialog, than to customize a standard dialog. If the customization is big enough.

  7. Manoj July 2, 2012 at 10:30 am

    Can i remove/change the border of the label Search Dialog????????? thnx for the code anyway:) gr8

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