Android:覆盖在Android相机预览上
我正在使用摄像头API并调用摄像头 我想在相机预览的顶部显示标题(用于品牌)。标题是jpeg图像 可能吗?谢谢你的帮助 提前谢谢 我的代码如下Android:覆盖在Android相机预览上,android,header,camera,Android,Header,Camera,我正在使用摄像头API并调用摄像头 我想在相机预览的顶部显示标题(用于品牌)。标题是jpeg图像 可能吗?谢谢你的帮助 提前谢谢 我的代码如下 public class CameraActivity extends Activity { @Override protected void onPause() { super.onPause(); } private static final int CAMERA_PIC_REQUEST = 250
public class CameraActivity extends Activity {
@Override
protected void onPause() {
super.onPause();
}
private static final int CAMERA_PIC_REQUEST = 2500;
private Bitmap image2;
private Bitmap bm;
public static String imagepath;
public static int x=1;
private RdmsDbAdapter dbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.header);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
//caling new incident
if(IncidentFormActivity.incident_id == null || IncidentFormActivity.isDisable==true){
//DBAdapter instance created and connection opened.
dbHelper = new RdmsDbAdapter(CameraActivity.this);
dbHelper.open();
//setting up flags
NewIncidentHelper nih = new NewIncidentHelper();
nih.setUpNewIncident();
//setting up incident_id
String Date= IncidentIdGenerator.getDate();
String Time = IncidentIdGenerator.getTime();
IncidentFormActivity.incident_id = IncidentIdGenerator.now("ddMMyyyyHHmmss");
dbHelper.executeSQL("insert into incident values ('" + IncidentFormActivity.incident_id
+ "', ' ', ' ', ' ', ' ', '"+Date+"', '0','0','0','0','0','0','0','0','0','"+Time+"')");
dbHelper.close();
}
//calling camera
Intent cameraIntent = new Intent(
android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);
}
public String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
int column_index = cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
//back key on phone pressed
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_BACK:
Intent i= new Intent(CameraActivity.this, IncidentFormActivity.class);
startActivity(i);
this.finish();
break;
default:
break;
}
return super.onKeyDown(keyCode, event);
}
//handle response came from camera when the picture is taken.
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_PIC_REQUEST && resultCode == RESULT_OK) {
final ImageView img = new ImageView(this);
img.setLayoutParams(new LayoutParams(100, 100));
image2 = (Bitmap) data.getExtras().get("data");
img.setImageBitmap(image2);
String incident_ID = IncidentFormActivity.incident_id;
//l2.addView(img);
imagepath="/sdcard/RDMS/"+incident_ID+ x + ".png";
File file = new File(imagepath);
try {
bm = Bitmap.createScaledBitmap( image2,400, 300, true);
file.createNewFile();
FileOutputStream ostream = new FileOutputStream(file);
bm.compress(CompressFormat.PNG, 90, ostream);
ostream.close();
//Initialising db class and inserting values
dbHelper = new RdmsDbAdapter(CameraActivity.this);
dbHelper.open();
dbHelper.executeSQL("insert into files values ('"+imagepath+"', '"+IncidentFormActivity.incident_id+"')");
dbHelper.close();
} catch (Exception e) {
e.printStackTrace();
Toast.makeText(getApplicationContext(),"yourfirst error message is "
+ e.toString(), 1000).show();
}
x++;
final AlertDialog.Builder alert = new AlertDialog.Builder(
CameraActivity.this);
alert.setTitle(getString(R.string.anotherimage));
alert.setCancelable(false);
//alert.setMessage("Play or Delete the Video selected");
//alert.setIcon(R.drawable.vid_red);
alert.setPositiveButton(getString(R.string.yes), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent sendingpage = new Intent(CameraActivity.this, CameraActivity.class);
startActivity(sendingpage);
}
});
alert.setNegativeButton(getString(R.string.no),
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent callback = new Intent (CameraActivity.this, IncidentFormActivity.class);
startActivity(callback);
}
});
alert.show();
}
if(resultCode==RESULT_CANCELED)
{
AlertDialog.Builder builder = new AlertDialog.Builder(CameraActivity.this);
builder.setMessage(getString(R.string.areuexit)).setCancelable(
false).setPositiveButton(getString(R.string.yes),
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent i= new Intent(CameraActivity.this, IncidentFormActivity.class);
startActivity(i);
CameraActivity.this.finish();
}
}).setNegativeButton(getString(R.string.no),
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
Intent i= new Intent(CameraActivity.this, CameraActivity.class); startActivity(i);
CameraActivity.this.finish();
}
});
builder.show();
}
}
}
你必须自己处理整个相机预览和拍照。查看
Samples/ApiDemos/src/com/example/android/api/graphics/CameraPreview
上的示例。您可以在预览区域上拥有自己的布局,并将图形添加到其中
示例链接
恐怕您必须自己实现摄像头预览屏幕。理论上,可以通过修改布局或创建覆盖窗口将覆盖添加到其他应用程序中。第一种方法是不可能实现的,第二种方法可以实现,但我认为这是一种黑客和容易出错的方法
实施您自己的相机活动不是一项非常困难的任务,但它相当具有挑战性。我建议您查看一下默认的照相机应用程序。以下是它的源代码:。您可以通过以下方式借助
FrameLayout
完成此操作:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<android.view.SurfaceView
android:id="@+id/surface"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
<ImageView
android:id = "@+id/header"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content" />
</FrameLayout>
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<android.view.SurfaceView
android:id="@+id/surface"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
<ImageView
android:id = "@+id/header"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content" />
</FrameLayout>
将对您有所帮助。您可以使用SurfaceView并创建一个自定义视图,该视图将打开摄像头,您可以相应地在xml中调整其大小。下面是一个伪代码
创建一个扩展SurfaceView的类,并在该类中打开摄影机
CapturePreview.java
public class CapturePreview extends SurfaceView implements SurfaceHolder.Callback{
public static Bitmap mBitmap;
SurfaceHolder holder;
static Camera mCamera;
public CapturePreview(Context context, AttributeSet attrs) {
super(context, attrs);
holder = getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {
Camera.Parameters parameters = mCamera.getParameters();
parameters.getSupportedPreviewSizes();
mCamera.setParameters(parameters);
mCamera.startPreview();
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
try {
mCamera = Camera.open();
mCamera.setPreviewDisplay(holder);
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
mCamera.stopPreview();
mCamera.release();
}
/***
*
* Take a picture and and convert it from bytes[] to Bitmap.
*
*/
public static void takeAPicture(){
Camera.PictureCallback mPictureCallback = new PictureCallback() {
@Override
public void onPictureTaken(byte[] data, Camera camera) {
BitmapFactory.Options options = new BitmapFactory.Options();
mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length, options);
}
};
mCamera.takePicture(null, null, mPictureCallback);
}
}
现在必须在xml中包含使用SurfaceView创建的视图,如下所示
main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<FrameLayout
android:id="@+id/mySurfaceView"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<com.cam.CapturePreview
android:layout_width="fill_parent"
android:layout_height="wrap_content">
</com.cam.CapturePreview>
</FrameLayout>
<LinearLayout
android:layout_below="@id/mySurfaceView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:gravity="center">
<ImageView android:id="@+id/myImageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/icon"/>
</LinearLayout>
</RelativeLayout>
现在,您可以在任何acitivity
中使用这个main.xml,该活动将使用ImageView
打开相机。
谢谢……看,您的XML是这样的:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<android.view.SurfaceView
android:id="@+id/surface"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
<ImageView
android:id = "@+id/header"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content" />
</FrameLayout>
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<android.view.SurfaceView
android:id="@+id/surface"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
<ImageView
android:id = "@+id/header"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content" />
</FrameLayout>
}
我想现在我也应该给你完整的XML部分。这就是:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:android1="http://schemas.android.com/apk/res/android"
android:id="@+id/containerImg"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android1:layout_gravity="bottom"
android:orientation="vertical"
android1:gravity="bottom" >
<FrameLayout
android:id="@+id/frameLayout1"
android1:layout_width="wrap_content"
android1:layout_height="wrap_content"
android:gravity="center|top"
>
<SurfaceView
android1:id="@+id/surfaceView1"
android1:layout_width="100dip"
android1:layout_height="150dip"
android1:layout_gravity="center_horizontal" />
<ImageView
android1:id="@+id/imageView1"
android1:layout_width="fill_parent"
android1:layout_height="fill_parent"
android:contentDescription="@string/app_dress_desc"
android:gravity="center|bottom"
android1:scaleType="center"
android1:src="@drawable/dress" />
</FrameLayout>
<GridLayout
android1:id="@+id/gridLayout1"
android1:layout_width="match_parent"
android1:layout_height="wrap_content"
android1:layout_alignParentBottom="true"
android1:layout_alignParentLeft="true"
android1:columnCount="1"
android1:gravity="center|bottom"
android1:orientation="vertical" >
<ImageButton
android1:id="@+id/capturebtn"
android1:layout_width="60dp"
android1:layout_height="wrap_content"
android1:layout_gravity="left"
android1:src="@drawable/camera"
android:contentDescription="@string/app_icon_camera_desc" />
<ImageButton
android1:id="@+id/savebtn"
android1:layout_width="60dp"
android1:layout_height="wrap_content"
android1:layout_column="0"
android1:layout_gravity="center_horizontal|top"
android1:layout_row="0"
android1:src="@drawable/save"
android:contentDescription="@string/app_icon_save_desc" />
<ImageButton
android1:id="@+id/sharebtn"
android1:layout_width="60dp"
android1:layout_height="wrap_content"
android1:layout_column="0"
android1:layout_gravity="right|top"
android1:layout_row="0"
android1:src="@drawable/share"
android:contentDescription="@string/app_icon_share_desc" />
</GridLayout>
“共享”按钮此时不起作用,但它会在单击捕获时保存整个帧布局。
希望这会有帮助 另一种解决方法是将活动XML文件与另一个包含标题图像的XML文件重叠。为此:
在布局文件夹中创建新的布局文件。例如:
overlay.xml
在其中插入一个ImageView
,类似于:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<ImageView
android:id="@+id/imageView1"
android:layout_centerInParent="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/android" />
</RelativeLayout>
最后从onCreate()
调用addView()
方法来添加图像:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.header);
addView();
最终的结果将是SurfaceView
上方的图像覆盖。根据标题图像的质量,标题的渲染质量应为原始质量。希望有帮助。标题是指摄像头应用程序顶部的图形还是类似水印的图形?是的,我想在顶部显示一个图形作为标题。谢谢。是的,我想在相机预览的顶部显示一张图片作为标题。没什么,我甚至不想改变拍摄的图像。谢谢。很好地分离了concernsHad,删除了android:layout_below=“@id/mySurfaceView”
,使代码正常工作。相机预览非常失真。现在解决方案是什么?请查看我从谷歌的Camera2Video中分出的示例代码,其中包含折旧问题的解决方案。链接怎么了?它似乎改变了方向。你能重新链接正确的链接吗?@PavanK更新了链接-@PavanK你的链接是Brokersory,但谷歌更新了他们的api。你可以在“不是一项很难的任务,但它很有挑战性”下搜索它。好吧,是哪一个?