Question

我正在尝试制作应用来制作照片并将其张贴在布局中。下一个代码可以做到这一点，但如果我有10张照片，我不知道如何识别每个imageview。

package com.selectphoto.dialog;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;

import com.selectphoto.R;
import com.selectphoto.ui.SelectPhotoBase;

import java.io.File;

public class TakePictureDialog extends Activity {

    private Uri outputFileUri;
    private static final int TAKE_PICTURE = 100;
    private LinearLayout layout_add_photo;

    @Override
    public void onCreate(Bundle savedInstance){
        super.onCreate(savedInstance);
        setContentView(R.layout.dialog_add_photo);

        final Button bt_return = (Button)findViewById(R.id.bt_return);
        final Button bt_take_photo = (Button)findViewById(R.id.bt_take_photo);

        bt_return.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                finish();
            }
        });

        bt_take_photo.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                openTakePicture();
            }
        });
    }


    /**
     * Call the camera app to take a picture.
     */
    public void openTakePicture() {
        // Create an output file.
        File file = new File(Environment.getExternalStorageDirectory(), "test.jpg");
        outputFileUri = Uri.fromFile(file);

        // Generate the Intent.
        Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        intent.putExtra(MediaStore.EXTRA_OUTPUT, outputFileUri);

        // Launch the camera app.
        startActivityForResult(intent, TAKE_PICTURE);
    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        layout_add_photo = (LinearLayout)findViewById(R.id.layout_add_photo);

        if (requestCode == TAKE_PICTURE) {
            if(data != null){
                if(WorldersBase.DEBUG)
                    Log.e(WorldersBase.TAG, "Error en onActivityResult if");
                if(data.hasExtra("data")){
                    Bitmap thumbnail = data.getParcelableExtra("data");
                    // Añadir al layout la imagen.
                }
            } else{
                if(WorldersBase.DEBUG)
                    Log.e(WorldersBase.TAG, "Error en onActivityResult else");
                // If there is no thumbnail image data, the image will have been stored in the
                // target output URI.

                // Resize the full image to fit in out image view.
                int width = layout_add_photo.getWidth();
                int height = 40;

                BitmapFactory.Options factoryOptions = new BitmapFactory.Options();

                factoryOptions.inJustDecodeBounds = true;
                BitmapFactory.decodeFile(outputFileUri.getPath(), factoryOptions);

                int imageWidth = factoryOptions.outWidth;
                int imageHeight = factoryOptions.outHeight;

                // Determine how much to scale down the image.
                int scaleFactor = Math.min(imageWidth/width, imageHeight/height);

                // Decode the image file into a Bitmap sized to fill the View.
                factoryOptions.inJustDecodeBounds = false;
                factoryOptions.inSampleSize = scaleFactor;
                factoryOptions.inPurgeable = true;

                Bitmap bitmap = BitmapFactory.decodeFile(outputFileUri.getPath(), factoryOptions);

                ImageView imageView = new ImageView(this);

                imageView.setImageBitmap(bitmap);
                layout_add_photo.addView(imageView);
            }
        }
    }
}

另一个问题是我需要将图片调整到更小的尺寸，我想640x480左右。但是按照Loading Large Bitmaps Efficiently - On developer.android.com的教程，我有点迷失了。我有下一个方法，但我认为它是加载项目的资源，而不是文件（如拍摄的照片），所以我不知道如何实现它。方法是：

public static int calculateInSampleSize(
            BitmapFactory.Options options, int reqWidth, int reqHeight) {
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {

        final int halfHeight = height / 2;
        final int halfWidth = width / 2;

        // Calculate the largest inSampleSize value that is a power of 2 and keeps both
        // height and width larger than the requested height and width.
        while ((halfHeight / inSampleSize) > reqHeight
                && (halfWidth / inSampleSize) > reqWidth) {
            inSampleSize *= 2;
        }
    }

    return inSampleSize;
}

public static Bitmap decodeSampledBitmapFromResource(Resources res, int resId,
        int reqWidth, int reqHeight) {

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeResource(res, resId, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    return BitmapFactory.decodeResource(res, resId, options);
}

我怎么能这样做？

谢谢。

Answer 1

imageview.setId(someintvalue);

解决这个好友;

如何识别以编程方式创建的图像视图？

1 个答案: