我已经在Android SDK上测试了我的应用程序,从1.5到2.2,我的活动中的摄像头代码运行正常。在2.1的设备上运行它也有效。但同样的应用程序无法与HTC Desire和Nexus One上的2.2兼容,应用程序崩溃。有什么想法可能会发生吗?
使用导入android.hardware.Camera; 。
在onCreate里面我有这个:
preview = (SurfaceView) findViewById(R.id.preview);
previewHolder = preview.getHolder();
previewHolder.addCallback(surfaceCallback);
previewHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
回调是
SurfaceHolder.Callback surfaceCallback = new SurfaceHolder.Callback() {
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
camera.stopPreview();
camera.release();
camera = null;
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
camera = Camera.open();
try {
camera.setPreviewDisplay(previewHolder);
} catch (Throwable t) {
Log.e(TAG, "Exception in setPreviewDisplay", t);
Toast.makeText(CameraActivity.this, t.getMessage(),
Toast.LENGTH_LONG).show();
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
Camera.Parameters parameters = camera.getParameters();
parameters.setPreviewSize(width, height);
camera.setParameters(parameters);
camera.startPreview();
}
};
答案 0 :(得分:9)
需要在获得最佳相机尺寸后设置相机的预览尺寸。以下是fix-
的详细信息和代码答案 1 :(得分:0)
问题是surfaceChanged方法传递的宽度和高度不是支持的预览尺寸。
因此,如果您想设置预览大小(parameters.setPreviewSize),则需要设置支持的预览大小。 getPreviewSize()方法返回可用的预览大小。所以你的surfaceChanged方法可以是这样的:
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
Camera.Parameters parameters = camera.getParameters();
Size pSize = camera.getParameters().getPreviewSize();
Log.d(TAG, "Setting preview size: " + pSize.width + " x " + pSize.height);
parameters.setPreviewSize(pSize.width, pSize.height);
camera.setParameters(parameters);
camera.startPreview();
}
您还可以使用android api版本5中提供的方法getSupportedPreviewSizes()获取支持的预览尺寸列表。
答案 2 :(得分:0)
你必须从相机拍摄照片,然后你必须裁剪。然后保存或设置。
您可以使用此代码。
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
mImageCaptureUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(),"connectR_" + String.valueOf(System.currentTimeMillis()) + ".jpg"));
intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
try {
intent.putExtra("return-data", true);
startActivityForResult(intent, PICK_FROM_CAMERA);
} catch (ActivityNotFoundException e) {
e.printStackTrace();
}
OnActivityResult。
case PICK_FROM_CAMERA:
doCrop();
break;
现在裁剪使用 doCrop()
的图像 final ArrayList<CropOption> cropOptions = new ArrayList<CropOption>();
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setType("image/*");
List<ResolveInfo> list = getPackageManager().queryIntentActivities( intent, 0 );
int size = list.size();
if (size == 0) {
Toast.makeText(this, "Can not find image crop app", Toast.LENGTH_SHORT).show();
return;
} else {
intent.setData(mImageCaptureUri);
intent.putExtra("outputX", 200);
intent.putExtra("outputY", 200);
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
intent.putExtra("scale", true);
intent.putExtra("return-data", true);
if (size == 1) {
Intent i = new Intent(intent);
ResolveInfo res = list.get(0);
i.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
startActivityForResult(i, CROP_FROM_CAMERA);
} else {
for (ResolveInfo res : list) {
final CropOption co = new CropOption();
co.title = getPackageManager().getApplicationLabel(res.activityInfo.applicationInfo);
co.icon = getPackageManager().getApplicationIcon(res.activityInfo.applicationInfo);
co.appIntent= new Intent(intent);
co.appIntent.setComponent( new ComponentName(res.activityInfo.packageName, res.activityInfo.name));
cropOptions.add(co);
}
CropOptionAdapter adapter = new CropOptionAdapter(getApplicationContext(), cropOptions);
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Choose Crop App");
builder.setAdapter( adapter, new DialogInterface.OnClickListener() {
public void onClick( DialogInterface dialog, int item ) {
startActivityForResult( cropOptions.get(item).appIntent, CROP_FROM_CAMERA);
}
});
builder.setOnCancelListener( new DialogInterface.OnCancelListener() {
@Override
public void onCancel( DialogInterface dialog ) {
if (mImageCaptureUri != null ) {
getContentResolver().delete(mImageCaptureUri, null, null );
mImageCaptureUri = null;
}
}
} );
AlertDialog alert = builder.create();
alert.show();
}
}