Question

我已设法实现ACTION_IMAGE_CAPTURE打算的使用，以便在我的应用中拍照。出于某种原因，当拍摄照片时，预览图像（在将其发送回我的应用程序之前显示的带有勾号/十字图标的图像）是正方形且分辨率非常低，即使我已经设置的图片保存到存储不是。我一直在回答抱怨所返回的低质量图像的所有问题，并且所有答案都提供了如何在应用程序本身中获得更高质量图像的解决方案，而不是如何告诉相机应用程序使用全质量预览。任何帮助都将非常感谢！

Answer 1

不是如何告诉相机应用程序使用全质量预览

这是因为您无法告诉相机应用程序＆＃34;使用完整质量的预览＆＃34;。

有成千上万的Android设备型号。这些设备型号中有数百种内置相机应用程序，还有许多可从Play商店等地方下载。 ACTION_IMAGE_CAPTURE的行为取决于那些应用程序＆＃39;开发人员，包括：

他们是否有确认屏幕（＆＃34;在发送回我的应用程序之前显示勾号/十字图标＆＃34;）
图片在确认屏幕上的样子

除了EXTRA_OUTPUT之外，在输入方面没有其他documented aspect to the ACTION_IMAGE_CAPTURE protocol，因此相机应用不需要提供任何其他内容。

无论出于何种原因，你的特定相机应用都没有特别好。

Answer 2

尝试检查以下代码工作，以完善我的应用。

<强> TakeImageActivity.java

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Locale;

import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
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.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class TakeImageActivity extends ActivityBase implements OnClickListener {

    File file,mFileTemp;

    Button buttonTakeImageCam;
    ImageView imageView;
    Uri mPhotoUri;
    Bitmap thumbnail;
    private Uri fileUri;
    private static final String IMAGE_DIRECTORY_NAME = "PhotoEditor Camera";
    public static final int MEDIA_TYPE_IMAGE = 1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.take_image_activity);

        file = new File(Environment.getExternalStorageDirectory()
                .getAbsolutePath() + "/FrameImages");

        initializetion();

    }

    private void initializetion() {
        // TODO Auto-generated method stub
        buttonTakeImageCam = (Button) findViewById(R.id.buttonTakeImageCam);
        buttonTakeImageCam.setOnClickListener(this);

        if (!isDeviceSupportCamera()) {
            Toast.makeText(getApplicationContext(),
                    "Sorry! Your device doesn't support camera",
                    Toast.LENGTH_LONG).show();
            // will close the app if the device does't have camera
            finish();
        }
    }

    private boolean isDeviceSupportCamera() {
        if (getApplicationContext().getPackageManager().hasSystemFeature(
                PackageManager.FEATURE_CAMERA)) {
            // this device has a camera
            return true;
        } else {
            // no camera on this device
            return false;
        }
    }

    public Uri getOutputMediaFileUri(int type) {
        return Uri.fromFile(getOutputMediaFile(type));
    }

    private static File getOutputMediaFile(int type) {

        // External sdcard location
        File mediaStorageDir = new File(
                Environment
                        .getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),
                IMAGE_DIRECTORY_NAME);

        // Create the storage directory if it does not exist
        if (!mediaStorageDir.exists()) {
            if (!mediaStorageDir.mkdirs()) {
                Log.d(IMAGE_DIRECTORY_NAME, "Oops! Failed create "
                        + IMAGE_DIRECTORY_NAME + " directory");
                return null;
            }
        }
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss",
                Locale.getDefault()).format(new Date());
        File mediaFile;
        if (type == MEDIA_TYPE_IMAGE) {
            mediaFile = new File(mediaStorageDir.getPath() + File.separator
                    + "IMG_" + timeStamp + ".jpg");
        } else {
            return null;
        }

        return mediaFile;
    }


    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub

        switch (v.getId()) {

        case R.id.buttonTakeImageCam:
            Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);

            fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);

            intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);

            // start the image capture Intent
            startActivityForResult(intent, 2);
            break;
        default:
            break;
        }

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // TODO Auto-generated method stub
        if (resultCode != RESULT_OK)
            return;

        switch (requestCode) {

        case 2:
                if (resultCode == RESULT_OK) {
                    // successfully captured the image
                    // display it in image view
                    previewCapturedImage();
                } else if (resultCode == RESULT_CANCELED) {
                    // user cancelled Image capture
                    Toast.makeText(getApplicationContext(),
                            "User cancelled image capture", Toast.LENGTH_SHORT)
                            .show();
                } else {
                    // failed to capture image
                    Toast.makeText(getApplicationContext(),
                            "Sorry! Failed to capture image", Toast.LENGTH_SHORT)
                            .show();
                }
            break;
        }
    }
        private void previewCapturedImage() {
            try {
                // bimatp factory
                BitmapFactory.Options options = new BitmapFactory.Options();

                // downsizing image as it throws OutOfMemory Exception for larger
                // images
                options.inSampleSize = 2;

                final Bitmap bitmap = BitmapFactory.decodeFile(fileUri.getPath(),
                        options);

                  //Set image here
                imgPreview.setImageBitmap(bitmap);

            } catch (NullPointerException e) {
                e.printStackTrace();
            }
        }

    public Bitmap getPreview(String fileName) {
        File image = new File(fileName);

        BitmapFactory.Options bounds = new BitmapFactory.Options();
        bounds.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(image.getPath(), bounds);
        if ((bounds.outWidth == -1) || (bounds.outHeight == -1)) {
            return null;
        }
        int originalSize = (bounds.outHeight > bounds.outWidth) ? bounds.outHeight
                : bounds.outWidth;
        BitmapFactory.Options opts = new BitmapFactory.Options();
        opts.inSampleSize = originalSize / 64;
        // opts.inSampleSize = originalSize;
        return BitmapFactory.decodeFile(image.getPath());
    }

    public String getPath(Uri uri) {
        String[] projection = { MediaStore.Images.Media.DATA };
        Cursor cursor = managedQuery(uri, projection, null, null, null);
        int column_index = cursor
                .getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(column_index);
    }
}

<强> take_image_activity.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_gravity="center" >

    <Button 
        android:id="@+id/buttonTakeImageCam"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="10dp"
        android:textSize="25sp"
        android:text="Camera"/>

</RelativeLayout>

<强>的AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.camera.photo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="9" />

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-feature android:name="android.hardware.camera" android:required="true"/>

    <application
        android:icon="@drawable/ic_launcher"
        android:largeHeap="true"
        android:label="@string/app_name" >
        <activity
            android:name=".TakeImageActivity"
            android:hardwareAccelerated="false"
            android:screenOrientation="portrait"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

使用ACTION_IMAGE_CAPTURE时，为什么预览图像模糊

2 个答案: