Question

我创建了一个自定义相机应用程序，用于捕获图像并将图像存储在图库中。我的应用程序工作得很好，但我对视图有小问题。

目前我的应用程序看起来像这样

enter image description here

当我在FrameLayout中使用Button并将其设置为Foreground时，我得到了一个Crash。我已在下面发布了编码

我的MainActivity.class

public class MainActivity extends Activity {

    private ImageHandler preview;
    Camera camera;
    int cameraID, currentCamera;
    Button capture;
    FrameLayout imageLayout;
    SurfaceView imgl;
    private static final String TAG = "CallCamera";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        /*
         * Invoking Camera and Setting the ImageHandler for preview
         */
        camera = getCameraInstance();
        preview = new ImageHandler(this, camera);

        /*
         * Getting the ID of the FrameLayout that displays the camera
         */

        imageLayout = (FrameLayout) findViewById(R.id.preview_layout);
        imageLayout.addView(preview);

        /*
         * Getting the ID of capture Button and setting its Functionality
         */

        capture = (Button) findViewById(R.id.cameraButton);

        capture.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                camera.takePicture(null, null, null, pic);
            }
        });

    }

    private Camera getCameraInstance() {
        // TODO Auto-generated method stub
        Camera cam = null;
        try {
            cam = Camera.open();
        } catch (Exception e) {

        }
        return cam;
    }

    PictureCallback pic = new PictureCallback() {

        @Override
        public void onPictureTaken(byte[] data, Camera camera) {

            File pictureFileDir = getDir();

            if (!pictureFileDir.exists() && !pictureFileDir.mkdirs()) {

                Log.d(TAG, "Can't create directory to save image.");
                Toast.makeText(getApplicationContext(),
                        "Can't create directory to save image.",
                        Toast.LENGTH_LONG).show();
                return;

            }

            SimpleDateFormat dateFormat = new SimpleDateFormat("yyyymmddhhmmss");
            String date = dateFormat.format(new Date());
            String photoFile = "Picture_" + date + ".jpg";

            String filename = pictureFileDir.getPath() + File.separator
                    + photoFile;

            File pictureFile = new File(filename);

            try {
                FileOutputStream fos = new FileOutputStream(pictureFile);
                fos.write(data);
                fos.close();
                Toast.makeText(getApplicationContext(),
                        "New Image saved:" + photoFile, Toast.LENGTH_LONG)
                        .show();
                sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"+ Environment.getExternalStorageDirectory())));
            } catch (Exception error) {
                Log.d(TAG,
                        "File" + filename + "not saved: " + error.getMessage());
                Toast.makeText(getApplicationContext(),
                        "Image could not be saved.", Toast.LENGTH_LONG).show();
            }



            camera.startPreview();
        }

        private File getDir() {
            File sdDir = Environment
                    .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
            return new File(sdDir, "MYCAMERA");
        }

    };


    @Override
    public void onResume() {
        super.onResume();
        if (camera == null) {
            camera = Camera.open();
            preview.setCamera(camera);
        }
    }

}

我的ImageHandler.class（预览）

public class ImageHandler extends SurfaceView implements SurfaceHolder.Callback {

    private SurfaceHolder holder;
    private Camera imgCamera;
    List<Size> imgSupportedPreviewSizes;

    public ImageHandler(Context context, Camera camera) {
        super(context);
        // TODO Auto-generated constructor stub
        this.imgCamera = camera;
        this.holder = this.getHolder();
        this.holder.addCallback(this);
        this.holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        // TODO Auto-generated method stub
        try {
            imgCamera.setPreviewDisplay(holder);
            imgCamera.startPreview();
        } catch (IOException e) {

        }
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        try {
            imgCamera.setPreviewDisplay(holder);
            imgCamera.startPreview();
            imgCamera.setDisplayOrientation(90);

        } catch (Exception e) {

        }

    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        // TODO Auto-generated method stub
        imgCamera.stopPreview();
        imgCamera.release();
    }

    public void setCamera(Camera camera) {
        imgCamera = camera;
        if (imgCamera != null) {
            imgSupportedPreviewSizes = imgCamera.getParameters()
                    .getSupportedPreviewSizes();
            requestLayout();
        }
    }

}

我的工作活动_main.xml

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <FrameLayout
        android:id = "@+id/btn_layout"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_alignParentBottom="true"
        android:layout_marginBottom="10dp">

        <Button
            android:id="@+id/cameraButton"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_gravity="center"
            android:text="Capture" />

    </FrameLayout>

    <FrameLayout
        android:id="@+id/preview_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_above="@+id/btn_layout"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp" >



    </FrameLayout>

</RelativeLayout>

我的更改/编辑的XML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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >



    <FrameLayout
        android:id="@+id/preview_layout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentTop="true"
        android:layout_marginTop="10dp"
        android:layout_marginBottom="10dp"
        android:foreground="@+id/cameraButton" >

        <Button
            android:id="@+id/cameraButton"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center|bottom"
            android:text="Capture" />



    </FrameLayout>

</RelativeLayout>

我的Logcat崩溃

12-05 11:19:59.346: E/AndroidRuntime(21506): FATAL EXCEPTION: main
12-05 11:19:59.346: E/AndroidRuntime(21506): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.camera/com.example.camera.MainActivity}: android.view.InflateException: Binary XML file line #13: Error inflating class <unknown>
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2146)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.app.ActivityThread.access$700(ActivityThread.java:140)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1238)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.os.Handler.dispatchMessage(Handler.java:99)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.os.Looper.loop(Looper.java:137)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.app.ActivityThread.main(ActivityThread.java:4944)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at java.lang.reflect.Method.invokeNative(Native Method)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at java.lang.reflect.Method.invoke(Method.java:511)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at dalvik.system.NativeStart.main(Native Method)
12-05 11:19:59.346: E/AndroidRuntime(21506): Caused by: android.view.InflateException: Binary XML file line #13: Error inflating class <unknown>
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.view.LayoutInflater.createView(LayoutInflater.java:619)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.view.LayoutInflater.onCreateView(LayoutInflater.java:666)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:691)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.view.LayoutInflater.rInflate(LayoutInflater.java:752)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.view.LayoutInflater.inflate(LayoutInflater.java:495)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:317)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.app.Activity.setContentView(Activity.java:1924)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at com.example.camera.MainActivity.onCreate(MainActivity.java:44)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.app.Activity.performCreate(Activity.java:5188)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2085)
12-05 11:19:59.346: E/AndroidRuntime(21506):    ... 11 more
12-05 11:19:59.346: E/AndroidRuntime(21506): Caused by: java.lang.reflect.InvocationTargetException
12-05 11:19:59.346: E/AndroidRuntime(21506):    at java.lang.reflect.Constructor.constructNative(Native Method)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at java.lang.reflect.Constructor.newInstance(Constructor.java:417)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.view.LayoutInflater.createView(LayoutInflater.java:593)
12-05 11:19:59.346: E/AndroidRuntime(21506):    ... 24 more
12-05 11:19:59.346: E/AndroidRuntime(21506): Caused by: android.content.res.Resources$NotFoundException: Resource is not a Drawable (color or path): TypedValue{t=0x12/d=0x0 a=3 r=0x7f080001}
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.content.res.Resources.loadDrawable(Resources.java:2239)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.content.res.TypedArray.getDrawable(TypedArray.java:601)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.widget.FrameLayout.<init>(FrameLayout.java:109)
12-05 11:19:59.346: E/AndroidRuntime(21506):    at android.widget.FrameLayout.<init>(FrameLayout.java:97)
12-05 11:19:59.346: E/AndroidRuntime(21506):    ... 27 more

我的编辑XML布局

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/preview_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <SurfaceView
        android:id="@+id/surfaceView1"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <Button
        android:id="@+id/cameraButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|center"
        android:text="Button" />

</FrameLayout>

我称之为表面视图的部分

super.onCreate（savedInstanceState）; 的setContentView（R.layout.activity_main）;

/*
 * Invoking Camera and Setting the ImageHandler for preview
 */
camera = getCameraInstance();
preview = new ImageHandler(this, camera);

/*
 * Getting the ID of the FrameLayout that displays the camera
 */

imageLayout = (FrameLayout) findViewById(R.id.preview_layout);
imageLayout.addView(preview);

/*
 * Getting the ID of capture Button and setting its Functionality
 */

我的新形象

enter image description here

Answer 1

 <FrameLayout
        android:id="@+id/preview_layout"
        .....
        android:layout_marginBottom="10dp"
        android:foreground="@+id/cameraButton" >  //<<<<< here

在android:foreground属性

中传递Drawable id而不是Button id

Answer 2

android：foreground =“@ + id / cameraButton”错了。你应该将一个drawable设置为android：foreground

在另一个视图前面设置一个按钮

2 个答案: