我正在努力实现像动画(上下),在我正在编码的android运动应用程序的相机预览活动的扫描仪线。动画覆盖摄像头活动预览
我已成功使动画代码在单个活动中工作 - 无需预览相机。不管我怎么试过我在这里阅读过的所有关于stackoverflow或者搜索网络的东西,我总是得到相机预览,但是不会动画叠加。
这里是我的xml文件:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/container"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
android:background="@android:color/transparent"
android:layout_centerInParent="true">
<SurfaceView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/imageView"
android:src="@drawable/scanline"
android:contentDescription="@string/scanline"
android:layout_gravity="left|center_vertical"
android:layout_alignParentStart="true"
android:layout_alignParentEnd="true"
android:background="@android:color/transparent"
android:baselineAlignBottom="false"/>
<com.app.arsinoe.ui.widget.CameraPreview
android:id="@+id/camera_preview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@android:color/transparent" />
<Button
android:layout_width="156dp"
android:layout_height="27dp"
android:text="@string/exit_button"
android:id="@+id/aboardButton2"
android:layout_gravity="bottom|left"
android:clickable="true"
android:background="#4e0612"
android:textColor="@android:color/white"
android:textStyle="bold"
android:alpha="1"
android:paddingEnd="@dimen/activity_horizontal_margin"
android:paddingStart="@dimen/activity_vertical_margin"
android:onClick="exitButton"/>
<Button
android:layout_width="310dp"
android:layout_height="27dp"
android:text="@string/scan_button"
android:id="@+id/scanButton"
android:layout_gravity="bottom|right"
android:clickable="true"
android:textColor="@android:color/white"
android:textStyle="bold"
android:alpha="1"
android:background="#1b4a6c"
android:paddingEnd="@dimen/activity_horizontal_margin"
android:paddingStart="@dimen/activity_vertical_margin"
android:onClick="scanButton"/>
</FrameLayout>
这里是扫描线的动画活动我的工作代码:
public class ScanActivity extends Activity{
private View view;
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.scan_activity);
final Context readySnanner = this;
Handler mHandler = new Handler();
Runnable
makeToast = new Runnable() {
public void run() {
Toast.makeText(readySnanner,
"Bla bla bla...", Toast.LENGTH_LONG).show();
}
};
mHandler.postDelayed(makeToast, 4000);
Toast.makeText(ScanActivity.this,"Bla bla... Please wait", Toast.LENGTH_SHORT).show();
ImageView animatedImage = (ImageView) findViewById(R.id.imageView);
Animation animation
= AnimationUtils.loadAnimation(this, R.anim.topdown);
if (animation != null) {
animatedImage.startAnimation(animation);}
final int SPLASH_TIME;// 4 seconds
SPLASH_TIME = 4 * 1000;
boolean b;
b = new Handler().postDelayed(new Runnable() {
@Override
public void run() {
}
}, SPLASH_TIME);
}
public void exitButton(View view) {
this.finish();
System.exit(0);
}
public void scanButton(View view) {
Intent intent = new Intent(ScanActivity.this,
B.class);
startActivity(intent);
ScanActivity.this.finish();
}
下面是CameraActivity我的工作代码:
public class CameraActivity extends Activity {
private Camera camera;
private View view;
SurfaceView animatedImage;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.scan_activity);
setResult(RESULT_CANCELED);
// Camera may be in use by another activity or the system or not available at all
try {
camera = getCameraInstance();
} catch (Exception e) {
e.printStackTrace();
}
if(cameraAvailable(camera)){
initCameraPreview();
} else {
finish();
}
}
// Show the camera view on the activity
private void initCameraPreview() {
CameraPreview cameraPreview = (CameraPreview) findViewById(R.id.camera_preview);
cameraPreview.init(camera);}
我不知道如何使这两个活动作为一个单独的活动一起运行,使用提供d xml文件。请帮助新手,导致我在这些问题上停留了5天!
我很抱歉没有提供图片来描述我正在尝试编码的内容,但我的声望很低。任何答复,最好与工作样本,将不胜感激。
编辑
下图展示了活动的布局:
红线应在动漫上下移动,ovelay相机预览。这是编码和在ImageView中工作,但不适用于CameraPreview。
这是我CameraPreview活动,编辑为Juan-devtopia.coop建议:
public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback {
private Context context;
private Camera camera;
public CameraPreview(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public CameraPreview(Context context, AttributeSet attrs) {
super(context, attrs);
}
public CameraPreview(Context context, Camera camera) {
super(context);
this.context = context;
this.camera = camera;
}
public void init(Camera camera) {
this.camera = camera;
initSurfaceHolder();
}
@SuppressWarnings("deprecation") // needed for < 3.0
private void initSurfaceHolder() {
SurfaceHolder holder = getHolder();
if (holder != null) {
holder.addCallback(this);
}
if (holder != null) {
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
initCamera(holder);
}
private void initCamera(SurfaceHolder holder) {
try {
camera.setPreviewDisplay(holder);
camera.startPreview();
} catch (Exception ignored) {
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
public void setContext(Context context) {
this.context = context;
}
public class Animation extends Activity {
ImageView animatedImage = (ImageView) findViewById(R.id.imageView);
android.view.animation.Animation animation;
{
animatedImage.startAnimation(animation);
animation = AnimationUtils.loadAnimation(this, R.anim.topdown);
}
}
在编译和运行设备,在logcat中我得到一个“了java.lang.RuntimeException:无法实例化活动” ,由“引起:由java.lang.InstantiationException:com.app.myapp.ui.widget.CameraPreview引起的任何建议?
谢谢Juan-devtopia.coop,为您解答。我会尝试按照您的建议编辑我的代码,如果一切正常,我会将您的答案标记为已接受。 – user3244633
我试图按照你的建议编辑代码,但没有成功。我相信我的CameraPreview布局有问题,因为我没有该活动的显式布局。我应该创建一个具有ImageView和camera_preview布局的新xml作为FrameWork吗?你可以再次看看我发布的代码,就像我现在编辑的那样,添加CameraPreview活动? – user3244633
为你上传了一个git示例项目,并编辑了我的问题,祝你的项目好运 –