Novice advice. . Questions about onPreviewFrame not called

In writing a simple camera to get the current preview image before sending out the program through onPreviewFrame.
But time is running entirely on the discovery does not call this function.
When debugging with debug gradual discovery came
camera.setPreviewCallback (MainActivity.this); sentence just jump set of variables Camera camera; This sentence then no. . . Did not call this function
onPreviewFrame
Some say the Internet using a surfaceholder.setType (SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); would not call onPreviewFrame. But warns that code inside eclipse is deprecated.


I removed this code (it should not be removed, right?) Direct program collapse.
How it was that way, you seek methods. Seeking answers ah.
How it can call this onPreviewFrame<-! Main posts under Banner (D4) -><-! Posts under the main text (D5) ->
Reply:
Code

 
package com.example.testfordraw; 




import java.io.ByteArrayInputStream; 
import java.io.ByteArrayOutputStream; 
import java.io.File; 
import java.io.IOException; 

import javax.security.auth.callback.Callback; 



import android.app.Activity; 
import android.content.Context; 
import android.content.pm.ActivityInfo; 
import android.graphics.Canvas; 
import android.graphics.Color; 
import android.graphics.Paint; 
import android.graphics.PixelFormat; 
import android.graphics.Rect; 
import android.graphics.YuvImage; 
import android.hardware.Camera; 
import android.hardware.Camera.Size; 
import android.media.MediaRecorder; 
import android.os.Bundle; 
import android.os.Environment; 
import android.util.AttributeSet; 
import android.view.Menu; 
import android.view.SurfaceHolder; 
import android.view.SurfaceView; 
import android.view.View; 
import android.view.Window; 
import android.view.WindowManager; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.Toast; 
public class MainActivity extends Activity implements SurfaceHolder.Callback, Camera.PreviewCallback {

private Camera camera; 
public static ByteArrayOutputStream outputstream = null; 
private SurfaceView msurfaceview; 
private Button buttonstart; 
private Button buttonstop; 
private MediaRecorder recorder; 
private SurfaceHolder surfaceholder; 
private File savefile; 
private File SDfile; 
private String savepath; 
private File recfile; 
private int Width = 320; 
private int Height = 240; 
private boolean isRecording = false; 
private boolean istrans = false; 
private int videoformat = 0; 
private int VideoQuality = 85; 
private float VideoWidthRatio = 1; 
private float VideoHeightRatio = 1; 
private String username = "wh"; 

@ Override 
protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState); 
requestWindowFeature (Window.FEATURE_NO_TITLE); 
getWindow () setFlags (WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);. 
getWindow () setFormat (PixelFormat.TRANSLUCENT);. 
setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE); 
setContentView (R.layout.activity_main); 
msurfaceview = (SurfaceView) findViewById (R.id.mysurfaceview); 
buttonstart = (Button) findViewById (R.id.start); 
SDfile = Environment.getExternalStorageDirectory (); 
savepath = SDfile.getAbsolutePath () + File.separator + "mvideo" + File.separator; 
savefile = new File (savepath); 
buttonstart.setText ("start"); 
buttonstart.setOnClickListener (new buttonstartlistener ()); 



if (! savefile.exists ()) 
{
savefile.mkdirs (); 
} 

} 
class buttonstartlistener implements OnClickListener {

@ Override 
public void onClick (View v) {
/ / TODO Auto-generated method stub 
if (istrans == false) 
{
/ / Record (); 
istrans = true; 
camera.setPreviewCallback (MainActivity.this); 
} Else {
/ / Stoprecording (); 
istrans = false; 
} 
if (istrans == false) 
{
buttonstart.setText ("start"); 
} Else {
buttonstart.setText ("stop"); 
} 
} 

} 
public void Stoprecording () {




if (recorder! = null) {
recorder.stop (); 
recorder.reset (); 
recorder.release (); 
recorder = null; 
isRecording = false; 
} 
try {
camera.reconnect (); 
} Catch (IOException e) {
Toast.makeText (this, "reconect fail", 0) show ();. 
e.printStackTrace (); 
} 
} 


public void record () 
{
try {

camera.unlock (); 
isRecording = true; 
recorder = new MediaRecorder (); 
recfile = File.createTempFile ("Video", ".3 gp", savefile); 
recorder.setCamera (camera); 
recorder.reset (); 
recorder.setCamera (camera); 
recorder.setVideoSource (MediaRecorder.VideoSource.CAMERA); 
recorder.setAudioSource (MediaRecorder.AudioSource.MIC); 
recorder.setOutputFormat (MediaRecorder.OutputFormat.THREE_GPP); 
recorder.setVideoEncoder (MediaRecorder.VideoEncoder.H264); 
recorder.setOutputFile (recfile.getAbsolutePath ()); 
recorder.setVideoSize (320,480); 
recorder.setVideoFrameRate (20); 
recorder.setAudioEncoder (MediaRecorder.AudioEncoder.AMR_NB); 
recorder.setPreviewDisplay (surfaceholder.getSurface ()); 
recorder.prepare (); 
recorder.start (); 
} Catch (IOException e) {
e.printStackTrace (); 
} 
} 

@ 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; 
} 


@ Override 
public void onPreviewFrame (byte [] data, Camera camera) {
/ / TODO Auto-generated method stub 
if (istrans == false) {
return; 
} 
if (data! = null) 
{
try {
YuvImage image = new YuvImage (data, videoformat, Width, Height, null); 
if (image! = null) {
ByteArrayOutputStream outstream = new ByteArrayOutputStream (); 
Rect rect = new Rect (0,0, (int) (VideoWidthRatio * Width), (int) (VideoHeightRatio * Height)); 
image.compressToJpeg (rect, VideoQuality, outstream); 
outputstream = outstream; 
outstream.flush (); 

} 
} Catch (Exception e) {} 
} 
} 




@ Override 
public void surfaceChanged (SurfaceHolder holder, int format, 
int width, int height) {
if (camera! = null) {
return; 
} 
camera.stopPreview (); 
camera.setPreviewCallback (MainActivity.this); 

Camera.Parameters parameters = camera.getParameters (); 
Size size = parameters.getPreviewSize (); 
Width = size.width; 
Height = size.height; 
videoformat = parameters.getPreviewFormat (); 
camera.startPreview (); 
/ / TODO Auto-generated method stub 

} 


@ Override 
protected void onStart () {
/ / TODO Auto-generated method stub 
surfaceholder = msurfaceview.getHolder (); 
surfaceholder.addCallback (this); 
surfaceholder.setType (SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); 
VideoWidthRatio = VideoWidthRatio/100f; 
VideoHeightRatio = VideoHeightRatio/100f; 
super.onStart (); 
} 


@ Override 
public void surfaceCreated (SurfaceHolder holder) {
camera = Camera.open (); 
try {
camera.setPreviewDisplay (surfaceholder); 
} Catch (IOException e) {
e.printStackTrace (); 
} 
camera.startPreview (); 
Camera.Parameters parameters = camera.getParameters (); 
Size size = parameters.getPreviewSize (); 
Width = size.width; 
Height = size.height; 
videoformat = parameters.getPreviewFormat (); 


} 

@ Override 
public void surfaceDestroyed (SurfaceHolder holder) {
if (camera! = null) {
camera.setPreviewCallback (null); 
camera.stopPreview (); 
camera.release (); 
camera = null; 
} 
} 



} 

Why are people you can call on me to do so. . camera.setPreviewCallback write ah
Reply:
Help ah. . . Tangled it for several days ah
Reply:
Nobody ah. . . Tangled for several days. . Well help you greatly
Reply:
Did not solve the problem? I have encountered it!
Reply:
I also encountered. . Jiong
Reply:
I do not know whether to go inside in SurfaceChanged deal. . Behind me try. .
Reply:
Need camera.unlock () when using the MediaRecorder; led onPreviewFrame () is not called to, so when recording video can not form a picture frame, I am now the question you want to form a frame while recording videos and pictures, if the landlord solved, can contact about me? Seek prompt help