在Android应用中实施图库

Question

我目前正在开发一款小应用，并打算在应用内构建一个图库。我目前有相机意图工作，但我不知道如何在网格中显示存储的图像（即GridView）。这是GalleryActivity：

public class GalleryActivity extends Activity {

    TextView header;

    private static final int ACT_START_CAMERA_APP = 0; //indicator to start the camera app
    private ImageView capturedPhoto;
    private String imageFileLocation = " ";

    protected void onCreate(Bundle saveInstanceState){
        super.onCreate(saveInstanceState);
        setContentView(R.layout.gallery_activity);

        capturedPhoto = (ImageView) findViewById(R.id.viewCapturedPhoto);

        header = (TextView) findViewById(R.id.heading);
        header.setTextKeepState("My Gallery");
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu){
        //inflate the menu; adds items to the action bar if present
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    //handles action bar item click here. The action bar
    //will automatically handle clicks on the home button
    //as long as you specify a parent activity in AndroidManifest.xml
    @Override
    public boolean onOptionsItemSelected(MenuItem item){
        int id = item.getItemId();

        if (id == R.id.action_settings){
            return true;
        }
        return super.onOptionsItemSelected(item);
    }


    //invoked ACTION_IMAGE_CAPTURE - native Android method to access the camera
    public void TakePhoto(View view){

        Intent callCameraApplicationIntent = new Intent();
        callCameraApplicationIntent.setAction(MediaStore.ACTION_IMAGE_CAPTURE);
        File photoFile = null;
        try{
            photoFile = createImageFile(); //will contain the address of the captured photo

        } catch (IOException exception) {
            exception.getStackTrace();
        }

        //intent used to store the requested image/file i.e. photoFile
        //tells Android where to store the picture
        callCameraApplicationIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(photoFile));
        startActivityForResult(callCameraApplicationIntent, ACT_START_CAMERA_APP);
    }


    //if we successfully take a picture print "Picture saved"
    //else return "Cannot connect to camera" by default
    protected void onActivityResult (int requestCode, int resultCode, Intent data){

        //check if you have similar results for defining ACT_START_CAMERA_APP and resultCode
        //if so, continue
        if(requestCode == ACT_START_CAMERA_APP && resultCode == RESULT_OK) {
            Toast.makeText(this, "Picture saved", Toast.LENGTH_SHORT).show();

            Bitmap capturedPhotoBitmap = BitmapFactory.decodeFile(imageFileLocation);
            capturedPhoto.setImageBitmap(capturedPhotoBitmap);
        }
    }

    //allows storage of pictures on the phone
    //create non-collision fileNames i.e. that do not have the same name and appends a stamp
    //to the photo to make it unique
    File createImageFile() throws IOException {

        //create timestamp
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        //append timestamp to generic name IMAGE_
        String imageFileName = "IMAGE_" + timeStamp + "_";
        File storageDirectory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);

        //now create the file
        File image = File.createTempFile(imageFileName, ".jpg", storageDirectory);
        imageFileLocation = image.getAbsolutePath();

        return image;
    }

我想知道是否将createImageFile()返回的图像存储在列表中并以gridView方式显示列表中的项目是可行的。这是Gallery的.xml：

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/heading"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:text="My Gallery"
        android:textSize="30dp"
        android:gravity="center"
        android:textStyle="bold"
        android:clickable="true"
        android:background="@android:color/holo_blue_light"
        android:textColor="#FFFFFF"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Camera"
        android:id="@+id/photoButton"
        android:onClick="TakePhoto"
        android:clickable="true"
        android:enabled="true"
        android:layout_alignBottom="@+id/heading"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true" />

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/photoButton"
        android:id="@+id/viewCapturedPhoto"
        android:clickable="true"
        />

    <GridView xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/grid_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:numColumns="auto_fit"
        android:columnWidth="90dp"
        android:horizontalSpacing="10dp"
        android:verticalSpacing="10dp"
        android:gravity="center"
        android:stretchMode="columnWidth"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/heading">

    </GridView>

</RelativeLayout>

正如您在xml中看到的那样，我在同一个文件中有相机按钮和GridView。将它们分开会更好吗？最后，我的意图的任何实施建议（即拍照，存储，然后在网格中显示）？