Android three ways to add events to a button

There are three ways to add events to a button in Android, and here's a summary, of course, it's completely Java based.

1. Internal class:

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Code fragment, double-click copy

Btn.setonclicklistener (New Onclicklistener ()

{

public void OnClick (View v)

{

...

}

});

This method is suitable for only a single button to add events, when the button is more, it is necessary to write the OnClick () method, this is not the best in practice.

2, create a separate class:

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Code fragment, double-click copy

Btn.setonclicklistener (New MyListener ());

Class MyListener implements Onclicklistener

{

public void OnClick (View v)

{

...

}

}

This practice is similar to that of an internal class, and the general practice does not require a separate declaration of a class. Instead, the inner class hides the implementation part from the class. Of course, this is better than the internal class is able to reuse.

3. Implement Interface only

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Code fragment, double-click copy

Btn.setonclicklistener (listener);

Onclicklistener listener = new Onclicklistener ()

{

public void OnClick (View v)

{

...

}

};

This saves code, and when there are multiple buttons, you can use a listener to reduce the call to the OnClick () method. And just in the onclick () method to determine which button is OK.

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Code fragment, double-click copy

BTN1 = (Button) Findviewbyid (R.ID.BTN1);

BTN2 = (Button) Findviewbyid (R.ID.BTN2);

Btn1.setonclicklistener (listener);

Btn2.setonclicklistener (listener);

Onclicklistener listener = new Onclicklistener ()

{

public void OnClick (View v)

{

BTN = (Button) v;

Switch (Btn.getid ())

{

Case R.ID.BTN1:

...;

Break

Case R.ID.BTN2:

...;

Break

...

}

}

};

Android photo, video, audio code example

Import Java.io.File;

Import Java.text.SimpleDateFormat;

Import Java.util.Date;

Import android.app.Activity;

Import android.content.Intent;

Import Android.database.Cursor;

Import Android.net.Uri;

Import Android.os.Bundle;

Import android.os.Environment;

Import Android.provider.MediaStore;

Import Android.view.View;

Import Android.view.View.OnClickListener;

Import Android.widget.Button;

Import Android.widget.Toast;

public class Activitymedia extends activity implements Onclicklistener {

private static final int result_capture_image = 1;//Photography Requestcode

private static final int request_code_take_video = 2;//Photography Requestcode

private static final int result_capture_recorder_sound = 3;//recording Requestcode

Private String Strimgpath = "";//Photo file absolute Path

Private String Strvideopath = "";//absolute path of video file

Private String Strrecorderpath = "";//absolute path of recording file

Button Buttonshot;

Button Buttonvideo;

Button Buttonrecorder;

@Override

protected void OnCreate (Bundle savedinstancestate) {

Super.oncreate (savedinstancestate);

This.setcontentview (R.layout.media);

Buttonshot = (Button) Findviewbyid (r.id.buttonshot);

Buttonshot.setonclicklistener (this);

Buttonvideo = (Button) Findviewbyid (R.id.buttonvideo);

Buttonvideo.setonclicklistener (this);

Buttonrecorder = (Button) Findviewbyid (R.id.buttonrecorder);

Buttonrecorder.setonclicklistener (this);

}

@Override

protected void Onactivityresult (int requestcode, int resultcode, Intent data) {

Super.onactivityresult (Requestcode, ResultCode, data);

Switch (requestcode) {

Case result_capture_image://Photo shoot

if (ResultCode = = RESULT_OK) {

Toast.maketext (This, Strimgpath, Toast.length_short). Show ();

}

Break

Case request_code_take_video://Shooting Video

if (ResultCode = = RESULT_OK) {

Uri Urivideo = Data.getdata ();

Cursor cursor=this.getcontentresolver (). query (urivideo, NULL, NULL, NULL, NULL);

if (Cursor.movetonext ()) {

/* _data: The absolute path of the file, _display_name: filename * *

Strvideopath = cursor.getstring (Cursor.getcolumnindex ("_data"));

Toast.maketext (This, Strvideopath, Toast.length_short). Show ();

}

}

Break

Case result_capture_recorder_sound://Recording

if (ResultCode = = RESULT_OK) {

Uri Urirecorder = Data.getdata ();

Cursor cursor=this.getcontentresolver (). query (urirecorder, NULL, NULL, NULL, NULL);

if (Cursor.movetonext ()) {

/* _data: The absolute path of the file, _display_name: filename * *

Strrecorderpath = cursor.getstring (Cursor.getcolumnindex ("_data"));

Toast.maketext (This, Strrecorderpath, Toast.length_short). Show ();

}

}

Break

}

}

/**

* Photographic function

*/

private void Cameramethod () {

Intent imagecaptureintent = new Intent (mediastore.action_image_capture);

Strimgpath = Environment.getexternalstoragedirectory (). toString () + "/consdcgmpic/";//folder where photos are stored

String fileName = new SimpleDateFormat ("YYYYMMDDHHMMSS"). Format (new Date ()) + ". jpg";//Photo naming

File out = new file (Strimgpath);

if (!out.exists ()) {

Out.mkdirs ();

}

out = new File (Strimgpath, fileName);

Strimgpath = strimgpath + filename;//absolute path to this photo

Uri uri = Uri.fromfile (out);

Imagecaptureintent.putextra (Mediastore.extra_output, URI);

Imagecaptureintent.putextra (mediastore.extra_video_quality, 1);

Startactivityforresult (Imagecaptureintent, result_capture_image);

}

/**

* Shooting Video

*/

private void Videomethod () {

Intent Intent = new Intent (mediastore.action_video_capture);

Intent.putextra (mediastore.extra_video_quality, 0);

Startactivityforresult (Intent, request_code_take_video);

}

/**

* Recording function

*/

private void Soundrecordermethod () {

Intent Intent = new Intent (intent.action_get_content);

Intent.settype ("Audio/amr");

Startactivityforresult (Intent, result_capture_recorder_sound);

}

/**

* Prompt Information

* @param text

* @param duration

*/

private void Showtoast (String text, int duration) {

Toast.maketext (Activitymedia.this, text, duration). Show ();

}

public void OnClick (View v) {

int id = V.getid ();

Switch (ID) {

Case R.id.buttonshot:

Cameramethod ();

Break

Case R.id.buttonvideo:

Videomethod ();

Break

Case R.id.buttonrecorder:

Soundrecordermethod ();

Break

}

}

}

Copy Code

Interface layout:

Xmlns:android= "Http://schemas.android.com/apk/res/android"

Android:layout_width= "Fill_parent"

android:layout_height= "Fill_parent" >

android:orientation= "Vertical"

Android:layout_width= "Fill_parent"

android:layout_height= "Fill_parent" >

Android:id= "@+id/buttonshot"

Android:layout_width= "Fill_parent"

android:layout_height= "Wrap_content"

android:text= "Photo"/>

Android:id= "@+id/buttonvideo"

Android:layout_width= "Fill_parent"

android:layout_height= "Wrap_content"

android:text= "Video"/>

Android:id= "@+id/buttonrecorder"

Android:layout_width= "Fill_parent"

android:layout_height= "Wrap_content"

android:text= "Recording"/>