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我是 Android 编程新手，我想编写一个简单的应用程序进行练习。我已经在网上搜索了几个小时，但没有找到任何问题的答案。

我想在正在运行的相机应用程序上方放置一个 2. 层。

如果我拍照，它不应该显示图片中的 2. 层，就像从来没有 2. 层一样。

那是当前的代码，只有工作相机。图片显示了它的外观： http ://www.bild.me/bild.php?file=91520242013-08-03_19-25-33.png

  public class MainActivity extends Activity {

    ImageView iv;

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

        startCamera();

    }

    public void startCamera() {
        iv = (ImageView)findViewById(R.id.imageView);

        Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);

        startActivityForResult(intent, 0);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        if(requestCode == 0) {
            Bitmap theImage = (Bitmap) data.getExtras().get("date");
            iv.setImageBitmap(theImage);
            startCamera();
        }

    }


}

编辑

答案中的 Logcat 异常：

08-04 12:33:44.403: E/AndroidRuntime(840): FATAL EXCEPTION: main
08-04 12:33:44.403: E/AndroidRuntime(840): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.camerafront/com.example.camerafront.AndroidCamera}: android.view.InflateException: Binary XML file line #1: Error inflating class menu
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.app.ActivityThread.access$600(ActivityThread.java:141)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.os.Handler.dispatchMessage(Handler.java:99)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.os.Looper.loop(Looper.java:137)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.app.ActivityThread.main(ActivityThread.java:5103)
08-04 12:33:44.403: E/AndroidRuntime(840):  at java.lang.reflect.Method.invokeNative(Native Method)
08-04 12:33:44.403: E/AndroidRuntime(840):  at java.lang.reflect.Method.invoke(Method.java:525)
08-04 12:33:44.403: E/AndroidRuntime(840):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
08-04 12:33:44.403: E/AndroidRuntime(840):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-04 12:33:44.403: E/AndroidRuntime(840):  at dalvik.system.NativeStart.main(Native Method)
08-04 12:33:44.403: E/AndroidRuntime(840): Caused by: android.view.InflateException: Binary XML file line #1: Error inflating class menu
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:707)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.view.LayoutInflater.inflate(LayoutInflater.java:469)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.view.LayoutInflater.inflate(LayoutInflater.java:397)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.view.LayoutInflater.inflate(LayoutInflater.java:353)
08-04 12:33:44.403: E/AndroidRuntime(840):  at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:267)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.app.Activity.setContentView(Activity.java:1895)
08-04 12:33:44.403: E/AndroidRuntime(840):  at com.example.camerafront.AndroidCamera.onCreate(AndroidCamera.java:30)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.app.Activity.performCreate(Activity.java:5133)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
08-04 12:33:44.403: E/AndroidRuntime(840):  ... 11 more
08-04 12:33:44.403: E/AndroidRuntime(840): Caused by: java.lang.ClassNotFoundException: Didn't find class "android.view.menu" on path: DexPathList[[zip file "/data/app/com.example.camerafront-2.apk"],nativeLibraryDirectories=[/data/app-lib/com.example.camerafront-2, /system/lib]]
08-04 12:33:44.403: E/AndroidRuntime(840):  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:53)
08-04 12:33:44.403: E/AndroidRuntime(840):  at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
08-04 12:33:44.403: E/AndroidRuntime(840):  at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.view.LayoutInflater.createView(LayoutInflater.java:559)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.view.LayoutInflater.onCreateView(LayoutInflater.java:652)
08-04 12:33:44.403: E/AndroidRuntime(840):  at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:66)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.view.LayoutInflater.onCreateView(LayoutInflater.java:669)
08-04 12:33:44.403: E/AndroidRuntime(840):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:694)
08-04 12:33:44.403: E/AndroidRuntime(840):  ... 20 more
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1 回答 1

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如果我理解正确，您想在预览区域放置一个 2 叠加层，但您不希望 2 出现在最终图像上。

如果这是正确的，我建议看看这篇文章： Android：Android Camera Preview 上的叠加

基本上，这将告诉您如何在 CameraView 上绘制叠加层。查看示例页面上的示例（名为 CameraPreview 的示例）。http://developer.android.com/tools/samples/index.html

于 2013-08-03T18:02:08.717 回答