问
获取Google Glass相机时出现间歇性错误
浅笑二度 发布于 2023-02-13 18:11在Glass GDK应用程序中获取相机时出现间歇性错误.该应用程序是一个简单的应用程序:
响应语音触发("测试相机")
启动活动以拍摄快照
返回调用Activity以显示快照.
问题是该应用程序可以正常工作,但它不时会一次又一次地获取相机.我已经将多个try/catch块中的相机调用完成处理(如果它无法获取相机,应用程序就会退出),但我想知道为什么它首先发生.
除了以下内容,我不会担心这个问题:
我注意到这些错误经常发生在我用"拍照"语音提示拍摄照片后启动应用程序(好像"拍照"应用程序没有释放相机.)
我投入了很多次尝试/捕获以防止每次不良的相机通话,但是......在我这样做之前,(即当我的代码不那么专注于释放相机时),设备会变得非常温暖,以至于我不得不把它关掉再打开以确保我没有损坏它.
我在日志中看到的唯一奇怪的事情是以下消息.我不知道"未知消息类型8192"可能是什么
11-29 19:38:16.344: E/Camera(4551): Received CAMERA_MSG_RELEASE 11-29 19:38:16.493: D/Camera-JNI(4551): android_hardware_Camera_release - context->decStrong(thiz) 11-29 19:38:16.524: E/Camera(4551): Unknown message type 8192
因为我不知道是什么导致了这个,所以我将发布整个项目,看看是否有一些xml文件或其他可能造成这种情况的模糊不清的地方.
这是清单:
这是语音触发器:
以下是字符串:
TestCamera Settings Hello world! test the camera Done Tap for options
以下是主要活动的布局:
以下是相机活动的布局:
以下是主要活动的代码:
package com.example.testcamera;
import java.io.File;
import com.google.android.glass.touchpad.Gesture;
import com.google.android.glass.touchpad.GestureDetector;
import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Point;
import android.speech.tts.TextToSpeech;
import android.util.Log;
import android.view.Display;
import android.view.Menu;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
public class MainActivity extends Activity {
// App responds to voice trigger "test the camera", takes a picture with CameraActivity and then returns.
private static final String TAG = MainActivity.class.getSimpleName();
private static final int TAKE_PHOTO_CODE = 1;
private static final int PROGRESS_TIMEOUT = 30000; // in ms --> 10s
private static final String IMAGE_FILE_NAME = "/sdcard/ImageTest.jpg";
private boolean picTaken = false; // flag to indicate if we just returned from the picture taking intent
private String theImageFile = ""; // this holds the name of the image that was returned by the camera
private TextView text1;
private TextView text2;
private ProgressBar myProgressBar;
protected boolean mbActive;
private String inputQueryString;
private String queryCategory;
final Handler myHandler = new Handler(); // handles looking for the returned image file
private int numberOfImageFileAttempts = 0;
private String responseBody = "";
private TextToSpeech mSpeech;
private boolean readyForMenu = false;
private boolean gotImageMatch = false;
private GestureDetector mGestureDetector;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.v(TAG,"creating activity");
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.activity_main);
text1 = (TextView) findViewById(R.id.text1);
text2 = (TextView) findViewById(R.id.text2);
text1.setText("");
text2.setText("");
myProgressBar = (ProgressBar) findViewById(R.id.my_progressBar);
LinearLayout llResult = (LinearLayout) findViewById(R.id.resultLinearLayout);
TextView tvResult = (TextView) findViewById(R.id.tap_instruction);
llResult.setVisibility(View.INVISIBLE);
tvResult.setVisibility(View.INVISIBLE);
myProgressBar.setVisibility(View.INVISIBLE);
// Even though the text-to-speech engine is only used in response to a menu action, we
// initialize it when the application starts so that we avoid delays that could occur
// if we waited until it was needed to start it up
mSpeech = new TextToSpeech(this, new TextToSpeech.OnInitListener() {
@Override
public void onInit(int status) {
// Do nothing.
}
});
mGestureDetector = createGestureDetector(this);
}
@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
protected void onResume() {
super.onResume();
if (!picTaken) {
Intent intent = new Intent(this, CameraActivity.class);
intent.putExtra("imageFileName",IMAGE_FILE_NAME);
startActivityForResult(intent,1);
}
else {
// do nothing
}
}
/*
* Send generic motion events to the gesture detector
*/
@Override
public boolean onGenericMotionEvent(MotionEvent event) {
if (mGestureDetector != null) {
return mGestureDetector.onMotionEvent(event);
}
return false;
}
private GestureDetector createGestureDetector(Context context) {
GestureDetector gestureDetector = new GestureDetector(context);
//Create a base listener for generic gestures
gestureDetector.setBaseListener( new GestureDetector.BaseListener() {
@Override
public boolean onGesture(Gesture gesture) {
if (gesture == Gesture.TAP) {
// do something on tap
Log.v(TAG,"tap");
//if (readyForMenu) {
openOptionsMenu();
//}
return true;
} else if (gesture == Gesture.TWO_TAP) {
// do something on two finger tap
return true;
} else if (gesture == Gesture.SWIPE_RIGHT) {
// do something on right (forward) swipe
return true;
} else if (gesture == Gesture.SWIPE_LEFT) {
// do something on left (backwards) swipe
return true;
}
return false;
}
});
gestureDetector.setFingerListener(new GestureDetector.FingerListener() {
@Override
public void onFingerCountChanged(int previousCount, int currentCount) {
// do something on finger count changes
}
});
gestureDetector.setScrollListener(new GestureDetector.ScrollListener() {
@Override
public boolean onScroll(float displacement, float delta, float velocity) {
// do something on scrolling
return false;
}
});
return gestureDetector;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.stop:
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
picTaken = true;
switch(requestCode) {
case (1) : {
if (resultCode == Activity.RESULT_OK) {
// TODO Extract the data returned from the child Activity.
Log.v(TAG,"onActivityResult");
File f = new File(IMAGE_FILE_NAME);
if (f.exists()) {
Log.v(TAG,"image file from camera was found");
Bitmap b = BitmapFactory.decodeFile(IMAGE_FILE_NAME);
Log.v(TAG,"bmp height=" + b.getHeight());
ImageView image = (ImageView) findViewById(R.id.bgPhoto);
image.setImageBitmap(b);
text1 = (TextView) findViewById(R.id.text1);
text2 = (TextView) findViewById(R.id.text2);
text1.setText("Got a picture.");
text2.setText("\nSaved successfully to " + IMAGE_FILE_NAME);
LinearLayout llResult = (LinearLayout) findViewById(R.id.resultLinearLayout);
llResult.setVisibility(View.VISIBLE);
TextView line1 = (TextView) findViewById(R.id.titleOfWork);
TextView line2 = (TextView) findViewById(R.id.Singer);
TextView tap = (TextView) findViewById(R.id.tap_instruction);
line1.setText("");
line2.setText("");
tap.setVisibility(View.VISIBLE);
}
}
else {
Log.v(TAG,"onActivityResult returned bad result code");
finish();
}
break;
}
}
}
@Override
protected void onDestroy() {
//Close the Text to Speech Library
if(mSpeech != null) {
mSpeech.stop();
mSpeech.shutdown();
mSpeech = null;
Log.d(TAG, "TTS Destroyed");
}
super.onDestroy();
}
}
以下是相机活动的代码:
package com.example.testcamera;
import java.io.BufferedOutputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Bitmap.CompressFormat;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.os.Bundle;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.ImageView;
public class CameraActivity extends Activity implements SurfaceHolder.Callback
{
private static final String TAG = CameraActivity.class.getSimpleName();
public static final int BUFFER_SIZE = 1024 * 8;
String imageFileName = "";
//a variable to store a reference to the Image View at the main.xml file.
private ImageView iv_image;
//a variable to store a reference to the Surface View at the main.xml file
private SurfaceView sv;
//a bitmap to display the captured image
private Bitmap bmp;
//Camera variables
//a surface holder
private SurfaceHolder sHolder;
//a variable to control the camera
private Camera mCamera;
//the camera parameters
private Parameters parameters;
@Override
public void onCreate(Bundle savedInstanceState)
{
Log.v(TAG,"onCreate");
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_camera);
//get the Image View at the main.xml file
iv_image = (ImageView) findViewById(R.id.imageView);
sv = (SurfaceView) findViewById(R.id.surfaceView);
//Get a surface
sHolder = sv.getHolder();
sHolder.addCallback(this);
Bundle extras = getIntent().getExtras();
// get the image file name from the caller to save the 640x360 image
imageFileName = extras.getString("imageFileName");
}
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3)
{
Log.v(TAG,"surfaceChanged");
//get camera parameters
try {
parameters = mCamera.getParameters();
Log.v(TAG,"got parms");
//set camera parameters
parameters.setPreviewSize(640,360);
parameters.setPictureSize(1280,720);
//Camera.Parameters params = mCamera.getParameters();
parameters.setPreviewFpsRange(30000, 30000);
Log.v(TAG,"parms were set");
mCamera.setParameters(parameters);
mCamera.startPreview();
Log.v(TAG,"preview started");
//sets what code should be executed after the picture is taken
Camera.PictureCallback mCall = new Camera.PictureCallback()
{
public void onPictureTaken(byte[] data, Camera camera)
{
Log.v(TAG,"pictureTaken");
Log.v(TAG,"data bytes=" + data.length);
//decode the data obtained by the camera into a Bitmap
Bitmap bmp = decodeSampledBitmapFromData(data,640,360);
Log.v(TAG,"bmp height=" + bmp.getHeight());
FileOutputStream outStream = null;
try{
FileOutputStream fos = new FileOutputStream(imageFileName);
final BufferedOutputStream bos = new BufferedOutputStream(fos, BUFFER_SIZE);
bmp.compress(CompressFormat.JPEG, 100, bos);
bos.flush();
bos.close();
fos.close();
} catch (FileNotFoundException e){
Log.v(TAG, e.getMessage());
} catch (IOException e){
Log.v(TAG, e.getMessage());
}
Intent resultIntent = new Intent();
// TODO Add extras or a data URI to this intent as appropriate.
resultIntent.putExtra("testString","here is my test");
setResult(Activity.RESULT_OK, resultIntent);
finish();
}
};
Log.v(TAG,"set callback");
mCamera.takePicture(null, null, mCall);
}
catch (Exception e) {
try {
mCamera.release();
Log.e(TAG,"released the camera");
}
catch (Exception ee) {
// do nothing
Log.e(TAG,"error releasing camera");
Log.e(TAG,"Exception encountered relerasing camera, exiting:" + ee.getLocalizedMessage());
}
Log.e(TAG,"Exception encountered, exiting:" + e.getLocalizedMessage());
mCamera = null;
Intent resultIntent = new Intent();
setResult(Activity.RESULT_CANCELED, resultIntent);
finish();
}
}
public static Bitmap decodeSampledBitmapFromData(byte[] data,
int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeByteArray(data, 0, data.length,options);
options.inSampleSize = 2; // saved image will be one half the width and height of the original (image captured is double the resolution of the screen size)
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeByteArray(data, 0, data.length,options);
}
public void surfaceCreated(SurfaceHolder holder)
{
Log.v(TAG,"surfaceCreated");
// The Surface has been created, acquire the camera and tell it where
// to draw the preview.
try {
mCamera = Camera.open();
Log.v(TAG,"acquired the camera");
mCamera.setPreviewDisplay(holder);
Log.v(TAG,"set surface holder for preview");
}
catch (Exception e) {
try {
mCamera.release();
Log.v(TAG,"released the camera");
}
catch (Exception ee) {
// do nothing
Log.e(TAG,"Exception encountered releasing camera, exiting:" + ee.getLocalizedMessage());
}
Log.e(TAG,"Exception encountered, exiting:" + e.getLocalizedMessage());
mCamera = null;
Intent resultIntent = new Intent();
setResult(Activity.RESULT_CANCELED, resultIntent);
finish();
}
}
public void surfaceDestroyed(SurfaceHolder holder)
{
Log.v(TAG,"surfaceDestroyed");
if (mCamera != null) {
mCamera.stopPreview();
//release the camera
mCamera.release();
//unbind the camera from this object
mCamera = null;
}
}
@Override
public void onPause()
{
Log.v(TAG,"onPause");
super.onPause();
if (mCamera != null) {
mCamera.stopPreview();
//release the camera
mCamera.release();
//unbind the camera from this object
mCamera = null;
}
}
@Override
public void onDestroy()
{
Log.v(TAG,"onDestroy");
super.onDestroy();
if (mCamera != null) {
mCamera.stopPreview();
//release the camera
mCamera.release();
//unbind the camera from this object
mCamera = null;
}
}
}
我打赌这是一件简单的事情,我看不到......
撰写答案
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