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我正在處理這段代碼，並且在我的第一個.java文件中，我用箭頭得到了一個錯誤，它說，jpegcallback無法解析，但它在那裏明確定義。我一直在計算結束時間}，並且在最後一行發現錯誤，說沒有足夠的數據，我是否在計數？我似乎無法找到我的程序中的錯誤，在eclipse中它說我的jpegcallback無法解決？
package com.example;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.app.Activity;
import android.hardware.Camera;
import android.hardware.Camera.PictureCallback;
import android.hardware.Camera.ShutterCallback;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.FrameLayout;
import android.speech.*;
public class CameraDemo extends Activity {
private static final String TAG = "CameraDemo";
Camera camera;
Preview preview;
Button buttonClick;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
preview = new Preview(this);
((FrameLayout) findViewById(R.id.preview)).addView(preview);
buttonClick = (Button) findViewById(R.id.buttonClick);
buttonClick.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
---------> preview.camera.takePicture(shutterCallback, rawCallback, jpegCallback);
}
});
Log.d(TAG, "onCreate'd");
}
ShutterCallback shutterCallback = new ShutterCallback()
{
public void onShutter()
{
Log.d(TAG, "onShutter'd");
}
};
/** Handles data for raw picture */
PictureCallback rawCallback = new PictureCallback()
{
public void onPictureTaken(byte[] data, Camera camera)
{
Log.d(TAG, "onPictureTaken - raw");
}
/** Handles data for jpeg picture */
PictureCallback jpegCallback = new PictureCallback()
{
public void onPictureTaken(byte[] data, Camera camera)
{
FileOutputStream outStream = null;
try
{
// write to local sandbox file system
//
outStream = CameraDemo.this.openFileOutput (String.format ("% d.jpg", System.currentTimeMillis()), 0);
// Or write to sdcard
outStream = new FileOutputStream(String.format("/sdcard/%d.jpg", System.currentTimeMillis()));
outStream.write(data);
outStream.close();
Log.d(TAG, "onPictureTaken - wrote bytes: " + data.length);
}
catch (FileNotFoundException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
finally
{
}
Log.d(TAG, "onPictureTaken - jpeg");
}
@Override
protected void
onActivityResult(int requestCode, int resultCode, Intent data)
{
if (requestCode == VOICE_RECOGNITION_REQUEST_CODE)
{
if (resultCode == RESULT_OK)
{
List<String> heard =
data.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
for (int i = 0; i < heard.size(); i++)
{
Log.d(TAG, i + ": " + heard.get(i));
}
receiveWhatWasHeard(heard);
}
else
{
//fail
}
}
super.onActivityResult(requestCode, resultCode, data);
}
};
protected void receiveWhatWasHeard(List<String> heard)
{
WordDictionary command = new WordDictionary("Add");
for (String said : heard)
{
if (command.isIn(said.split("\\s")))
{
Log.d(TAG, "heard add");
}
}
}
public class WordDictionary
{
private Set<String> words;
public WordDictionary(String... wordsIn)
{
this(Arrays.asList(wordsIn));
}
public WordDictionary(List<String> wordsIn)
{
words = new LinkedHashSet<String>(wordsIn);
}
public Set<String> getWords()
{
return words;
}
public boolean isIn(String word)
{
return words.contains(word);
}
public boolean isIn(String [] wordsIn)
{
boolean wordIn = false;
for (String word : wordsIn)
{
if (isIn(word))
{
wordIn = true;
break;
}
}
return wordIn;
}
}
preview.java
package com.example;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.hardware.Camera;
import android.hardware.Camera.PreviewCallback;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
class Preview extends SurfaceView implements SurfaceHolder.Callback {
private static final String TAG = "Preview";
SurfaceHolder mHolder;
public Camera camera;
Preview(Context context) {
super(context);
// Install a SurfaceHolder.Callback so we get notified when the
// underlying surface is created and destroyed.
mHolder = getHolder();
mHolder.addCallback(this);
mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
public void surfaceCreated(SurfaceHolder holder) {
// The Surface has been created, acquire the camera and tell it where
// to draw.
camera = Camera.open();
try {
camera.setPreviewDisplay(holder);
camera.setPreviewCallback(new PreviewCallback() {
public void onPreviewFrame(byte[] data, Camera arg1) {
FileOutputStream outStream = null;
try {
outStream = new FileOutputStream(String.format("/sdcard/%d.jpg", System.currentTimeMillis()));
outStream.write(data);
outStream.close();
Log.d(TAG, "onPreviewFrame - wrote bytes: " + data.length);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
Preview.this.invalidate();
}
});
} catch (IOException e) {
e.printStackTrace();
}
}
public void surfaceDestroyed(SurfaceHolder holder) {
// Surface will be destroyed when we return, so stop the preview.
// Because the CameraDevice object is not a shared resource, it's very
// important to release it when the activity is paused.
camera.stopPreview();
camera = null;
}
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
// Now that the size is known, set up the camera parameters and begin
// the preview.
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(w, h);
camera.setParameters(parameters);
camera.startPreview();
}
@Override
public void draw(Canvas canvas) {
super.draw(canvas);
Paint p= new Paint(Color.RED);
Log.d(TAG,"draw");
canvas.drawText("PREVIEW", canvas.getWidth()/2, canvas.getHeight()/2, p);
}
}
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" android:id="@+id/layout">
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="VoCam"
android:textSize="24sp" />
<FrameLayout android:id="@+id/preview"
android:layout_weight="1" android:layout_width="fill_parent"
android:layout_height="fill_parent">
</FrameLayout>
<Button android:layout_width="wrap_content"
android:layout_height="wrap_content" android:id="@+id/buttonClick"
android:text="Listening" android:layout_gravity="center"></Button>
</LinearLayout>
manifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example" android:versionCode="1" android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".CameraDemo" android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-sdk android:minSdkVersion="7" />
<uses-permission android:name="android.permission.CAMERA" />
</manifest>
什麼是jpegCallback這裏。 –
請發佈例外日誌 – Jack