我第二次不能拍照。我尝试拍摄更多照片，但我不能。 你能帮我找到错误并解决这个问题吗？
谢谢
public class TakePicture extends Activity implements SurfaceHolder.Callback {
TextView testView;
Button takePicture;
ImageView view;
Camera camera;
SurfaceView surfaceView;
SurfaceHolder surfaceHolder;
PictureCallback rawCallback;
ShutterCallback shutterCallback;
PictureCallback jpegCallback;
private final String tag = "VideoServer";
boolean inPreview = false;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
takePicture = (Button) findViewById(R.id.button1);
view = (ImageView) findViewById(R.id.imageView1);
takePicture.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
captureImage();
}
});
surfaceView = (SurfaceView) findViewById(R.id.surfaceView1);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
rawCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
Log.d("Log", "onPictureTaken - raw");
}
};
shutterCallback = new ShutterCallback() {
public void onShutter() {
Log.i("Log", "onShutter'd");
}
};
jpegCallback = new PictureCallback() {
public void onPictureTaken(byte[] data, Camera camera) {
// Set the Image to ImageView
Bitmap bitmapPicture = BitmapFactory.decodeByteArray(data, 0,
data.length);
view.setImageBitmap(bitmapPicture);
Random an = new Random();
// Save the Image to SD Card
FileOutputStream outStream = null;
try {
outStream = new FileOutputStream(String.format(
"/sdcard/pictures/screenshots/" + an.nextInt()
+ ".jpg", System.currentTimeMillis()));
outStream.write(data);
outStream.close();
Log.d("Log", "onPictureTaken - wrote bytes: " + data.length);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
}
Log.d("Log", "onPictureTaken - jpeg");
/**
* The two lines below are used to refresh the Surface View It
* works quickly then the general refresh by Default
**/
stop_camera();
start_camera();
}
};
}
@Override
protected void onResume() {
// TODO Auto-generated method stub
super.onResume();
}
@Override public void onBackPressed()
{
// Restart camera
super.onBackPressed();
if (camera != null) {
Log.e(tag, "Camera was not null on back pressed!");
try {
camera.stopPreview();
} catch (Exception e) {
}
// camera.release();
// camera = null;
}
finish();
}
@Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
}
private void captureImage() {
// TODO Auto-generated method stub
camera.takePicture(shutterCallback, rawCallback, jpegCallback);
}
private void start_camera() {
try {
camera = Camera.open();
camera.setDisplayOrientation(90);
} catch (RuntimeException e) {
Log.e(tag, "init_camera: " + e);
return;
}
Camera.Parameters param;
param = camera.getParameters();
// modify parameter
param.setPreviewFrameRate(20);
param.setPreviewSize(176, 144);
camera.setParameters(param);
try {
camera.setPreviewDisplay(surfaceHolder);
camera.startPreview();
// camera.takePicture(shutter, raw, jpeg)
} catch (Exception e) {
Log.e(tag, "init_camera: " + e);
return;
}
inPreview = true;
}
private void stop_camera() {
camera.stopPreview();
camera.release();
inPreview = false;
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
start_camera();
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
stop_camera();
}
}
下面是布局文件和androidmennifest文件
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<SurfaceView
android:id="@+id/surfaceView1"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:text="Take Picture" />
<ImageView
android:id="@+id/imageView1"
android:layout_width="200dp"
android:layout_height="200dp"
android:layout_alignLeft="@+id/surfaceView1"
android:layout_below="@+id/button1"
android:src="@drawable/ic_launcher" />
</RelativeLayout>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.mzubair.takepicture"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="view.TakePicture"
android:label="@string/title_activity_take_picture" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
答案 0 :(得分：0)
尝试添加camera.startPreview（）;在camera.takePicture（）;
之前