相机预览示例

Question

I know this is really basic but it is a error that I cannot find a solution to.

http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/CameraPreview.html

I have 2 errors and I dont know what Im doning wrong.

public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate our menu which can gather user input for switching camera
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.camera_menu, menu);
    return true;
}

Im getting an error at "menu" in "R.menue..."

error 2:

public boolean onOptionsItemSelected(MenuItem item) {
        // Handle item selection
        switch (item.getItemId()) {
        case R.id.switch_cam:
            // check for availability of multiple cameras
            if (numberOfCameras == 1) {
                AlertDialog.Builder builder = new AlertDialog.Builder(this);
                /**builder.setMessage(this.getString(R.string.camera_alert))
                       .setNeutralButton("Close", null);*/
                AlertDialog alert = builder.create();
                alert.show();
                return true;
}

Im getting an error on "id" in "case R.id..."

Thanks

Answer 1

First, do you have : <uses-permission android:name="android.permission.CAMERA" /> in your AndroidManifest.xml ?

You can try to check a full Camera preview here for Android : Camera Preview Android

Another good website with source files : Using Camera API with SourceFile

Answer 2

You most likely just copied the source file you linked above into your project. You also have to add res/menu/camera_menu.xml . This defines the options menu that comes up when you press the menu button. See the menu doc for more information how that works if you're interested.

If you don't do that the tools notice that you miss a file that you reference in code but that's not actually there, which results the first error. The second error is also caused by this in an indirect way. The missing ID is also created within the menu file.