surfaceholder

public class Videoactivity extends Activity implements callback{Private Surfaceview view;Private Surfaceholder holder;Private MediaPlayer MPlayer;Private String path;@Overrideprotected void OnCreate (Bundle savedinstancestate) {Super.oncreate (savedinstancestate);Setcontentview (R.layout.video_main);Initwidgets ();}private void Initwidgets () {view= (Surfaceview) Findviewbyid (R.id.surfaceview);Holder=view.getholder ();Holder.setfixedsize (320, 480);H

MainActivity: [java] package c. c; import java. io. file; import java. io. IOException; import android. app. activity; import android. content. pm. activityInfo; import android. media. mediaRecorder; import android. OS. bundle; import android. OS. environment; import android. view. surfaceHolder; import android. view. surfaceView; import android. view. view; import android. view. view. onClickListener; import android. vie W. window; import android. vi

First, paste the program running result of this article. The above is the playing/stopping audio, and the progress can be adjusted using SeekBar. below is the playing/stopping video, and the progress is also adjusted using SeekBar: Source code of main. xml: The source code of this program is a bit long: Pack

the View for drawing. The main difference between SurfaceView mode and View mode is that SurfaceView defines a special thread to complete the drawing work. The application does not need to wait for the View to be refreshed, thus improving the performance. The View method is suitable for animations with relatively small processing capacity and low frame rate, such as chess games. The SurfaceView method is mainly used in games and high-quality animations. To use SurfaceView, follow these steps: 1

(new Mysurfaceview (this)); } Surfaceview Package Com.view; Import Android.content.Context; Import Android.graphics.Canvas; Import Android.graphics.Color; Import Android.graphics.Paint; Import android.view.KeyEvent; Import android.view.MotionEvent; Import Android.view.SurfaceHolder; Import Android.view.SurfaceHolder.Callback; Import Android.view.SurfaceView; public class Mysurfaceview extends Surfaceview implem

..."); Super.ondestroy (); } @Override protected void OnStop () {LOG.D (TAG, "stopping ..."); Super.onstop (); } } 2. Mainthread.java: Package Net.obviam.droidz; Import Android.util.Log; Import Android.view.SurfaceHolder; public class Mainthread extends Thread { private static final String TAG = MainThread.class.getSimpleName (); Private Surfaceholder Surfaceholder; Private Maingamepanel

Mysurfaceviewanimation.java class below: Java code public class Mysurfaceviewanimation extends Surfaceview implements Callback, Runnable {private Thread th; Private Surfaceholder SFH; Private Canvas Canvas; Private Paint Paint; Private Bitmap bmp; private int bmp_x, bmp_y; Public Mysurfaceviewanimation {Super (context); This.setkeepscreenon (TRUE); BMP = Bitmapfactory.decoderesource (Getresources (), r.draw

to inherit Surfaceview and implement the Surfaceholder.callback interface, which is a surfaceholder internal interface that enables the interface to get information about the changes to the interface, code as follows, and we declare some member variables: Java code public class Movementview extends Surfaceview implements Surfaceholder.callback { private int xpos; private int yPos; private int xvel; private int yvel; p

The difference between Surfaceview and viewView is in the main thread of the UI that responds directly to the user's actions, as well as the distribution of tasks, but the task is more complex and can become blocked.Surfaceview does not have this problem, assuming that it obtains images directly from memory, and more importantly, Surfaceview can change the UI through threads outside the main thread.UseUpdates to the UI are divided into active and passive updates, and for passive updates, they ar

program enters the background! If the canvas is empty, submit the painting. A parameter Exception error occurs! The following is another case: thread startup exception! For example, (simulator error prompt and Logcat Detail) This exception is only reported when you click the Home button during the program running and enter the program again. The exception indicates that our thread has been started! Why is the return button okay? OK. Next we will explain in detail the Back and Home butto

To take a photo with the camera step:Call the camera's open () method to turn on the cameras. This method opens the rear-facing camera by default. If you need to turn on the specified camera, you can pass in the camera ID for that method.Call the camera's GetParameters () method to get the camera parameters. The method returns a Camera.parameters objectCall the Camera.parameters object method to set the camera parametersCall the camera's Startpreview () method to start previewing the framing and

MainActivity is as follows: Package c. c; import java. io. file; import java. io. IOException; import android. app. activity; import android. content. pm. activityInfo; import android. hardware. camera; import android. media. mediaRecorder; import android. media. mediaRecorder. onInfoListener; import android. OS. bundle; import android. OS. environment; import android. view. surfaceHolder; import android. view. surfaceView; import android. view. view;

. screenheight = DM. heightpixels; // obtain the screen height}/*** set to full screen */Public void setfullscreen () {requestwindowfeature (window. feature_no_title); getwindow (). addflags (windowmanager. layoutparams. flag_fullscreen);}/*** method of setting to portrait screen */Public void setportrait () {setrequestedorientation (activityinfo. screen_orientation_portrait);}/*** method for setting it to landscape screen */Public void setlandscape () {setrequestedorientation (activityinfo. scr

Although the previous view is used for plotting, the view plotting mechanism has two defects: 1. Lack of Dual-BUFFER MECHANISM 2. When updating an image, you must update the entire image on the view, which is inefficient. Therefore, surfaceview is recommended for game plotting. It can only update the specified region to improve efficiency. The following is a simple example to demonstrate the use of surfaceview: Activity: Package COM. home. activity; import android. app. activity; import android.

Create a preview class To allow users to effectively obtain images and videos, they must be able to see images in the camera. A camera preview class is a surfaceview class that can display Real-Time Images in the camera, so users can frame and capture images or videos. The Code in the following example demonstrates how to create a basic camera preview class that can be included by a viewlayout. This class implements surfaceholder. callback to obtain t

phones. 1. Activity Class Public class mainactivity extends activity implements surfaceholder. callback {Private Static final string tag = "mainactivity"; private surfaceview msurfaceview; private button mbtnstartstop; private Boolean mstartedflg = false; private mediarecorder mrecorder; private surfaceholder msurfaceholder; @ override public void oncreate (bundle savedinstancestate) {super. oncreate (save

Android uses camera to control the photo taking. It is relatively simple to use camera, and you can proceed with the following steps: The following is an example: Activity: Package COM. home. activity; import Java. io. file; import Java. io. fileoutputstream; import android. app. activity; import android. app. alertdialog; import android. content. context; import android. content. dialoginterface; import android. content. res. configuration; import android. graphics. bitmap; import android. gra

the mysurfaceactivity. Java file to implement button listening and surfaceholder. Callback interfaces. The complete content is as follows: 1 package com. Nan. surface;234 Import Android. App. activity;5 import Android. Graphics. Canvas;6 Import Android. Graphics. color;7 Import Android. Graphics. paint;8 Import Android. Graphics. rect;9 Import Android. OS. Bundle;10 Import Android. View. surfaceholder;11

"); return new Myengine (); } private class Myengine extends engine{private float x = 200; Private float y = 300; Private Paint Mpaint; Private Boolean mvisible = false; Private Runnable Drawthread = new Runnable () {public void run () {drawwallpaper (); } }; Public Myengine () {log.i (TAG, "myengine"); Mpaint = new Paint (); Mpaint.setcolor (color.red); M

Android.widget.imageview;import Android.widget.mediacontroller;import Android.widget.popupwindow;import Android.widget.seekbar;import Android.widget.SeekBar.OnSeekBarChangeListener; Import Android.widget.textview;public class Mainactivity extends Activity {private final static String TAG = "mainactivity ";p rivate Context mcontext = this;private Surfaceview Surfaceview = null;private Surfaceholder Surfaceholder