Question

目前正在制作一个应用程序，其中有3个用于布局的按钮：“拍照”，“保存”和“签名”。 “拍摄照片”按钮用于从手机启动相机拍摄照片，一旦我拍摄了该照片，无论它是什么，都会显示在imageView中。保存按钮应该将该图像保存到图库中。不幸的是，当我运行我的应用程序时，我可以知道该图像正在保存，但是该图像未显示在布局或手机的图库中。我尝试了以下方法：

摆脱uses-permission android:name="android.permission.CAMERA"（离开这在我的清单中导致我的应用崩溃了
将目录从DIRECTORY_PICTURES更改为DIRECTORY_DCIM 应用布局：output

如何解决此问题，使其在imageView上显示图像，但实际图像在画廊中却应有的样子？代码在下面发布。另外，我的最低SDK版本为15，而最高SDK版本为28。

Android：Manifest.xml ：

<?xml version="1.0" encoding="utf-8"?>

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

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

package com.example.businessdeliveryappv4;

import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.StrictMode;
import android.provider.MediaStore;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;

//launch this layout
public class DriverActivity extends AppCompatActivity
{
    public static final int CAMERA_REQUEST = 10;
    Button signatureButton, goBackButton, takePhotoButton, saveButton;
    ImageView imageView;
    Uri fileUri;

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

        goBackButton = (Button) findViewById(R.id.goBackButton);
        signatureButton = (Button) findViewById(R.id.signatureButton);
        takePhotoButton = (Button) findViewById(R.id.takePhotoButton); // take picture
        saveButton = (Button) findViewById(R.id.saveButton); // save the picture to gallery
        imageView = (ImageView) findViewById(R.id.imageView);// get access to the image view.

        goBackButton.setVisibility(View.INVISIBLE);
        String editTextUserName = 
getIntent().getStringExtra("editTextUserName");
        ((TextView) findViewById(R.id.driverActivityTextView)).setText
            ("Driver: " + editTextUserName + ", " + "\n Customer: (Customer Name)" + "\n 6851 Almont cv \n Stone Mountain, GA 30087");
        StrictMode.VmPolicy.Builder newbuilder = new 
StrictMode.VmPolicy.Builder();
        StrictMode.setVmPolicy(newbuilder.build());
}

/**
 * This method will be called when the Take Photo button is clicked.
 */
public void takePhotoButton(View v)
{
    Toast.makeText(this, "Camera in Use", Toast.LENGTH_SHORT).show();
    Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    // Get the file (just using our method)
    File file = getOutputFile();
    // Get the file's Uri
    fileUri = Uri.fromFile(file);
    // Ask the camera to save the output there
    cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
    // and then start the activity just as you did before
    startActivityForResult(cameraIntent, CAMERA_REQUEST);
}

//this method will be called when the Save button is clicked. the purpose of this method is
//to save the photo in the gallery.

public void SavePhotoButton(View v)
{
    // Get the file, same method as before
    File file = getOutputFile();
    try
    {
        // Try to open an output stream
        FileOutputStream fos = new FileOutputStream(file);
        // Get the image
        BitmapDrawable drawable = (BitmapDrawable) imageView.getDrawable();
        Bitmap bm = drawable.getBitmap();
        // save the image to the output stream
        bm.compress(Bitmap.CompressFormat.JPEG, 100, fos);
        // Flush so nothing gets stuck in the cache
        fos.flush();
        // Close the output stream
        fos.close();
        // We have to let everybody know the gallery changed
        addPhotoToGallery(Uri.fromFile(file));
    }
    catch (IOException ioe)
    {
        // This is not supposed to happen, so I'm printing the stack trace just
        // in case we need to debug
        ioe.printStackTrace();
    }
    Toast.makeText(this, "Photo saved in gallery", Toast.LENGTH_SHORT).show();
}

private void addPhotoToGallery(Uri imageUri)
{
    Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    mediaScanIntent.setData(imageUri);
    this.sendBroadcast(mediaScanIntent);

}

public File getOutputFile()
{
    File directory = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), getPackageName());
    // If the directory doesn't exist
    if (!directory.exists())
    {
        // try and create it
        if (!directory.mkdirs())
        {
            Log.e("ERROR", "Couldn't create the directory");
        }
    }
    String timestamp = new SimpleDateFormat("yyyyMMdd_HHmmss", Locale.US).format(new Date());
    return new File(directory.getPath() + File.separator + "IMG" + timestamp + ".jpg");
}

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data)
{
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == RESULT_OK && requestCode == CAMERA_REQUEST)
    {
        Uri photoUri = null;
        if (data == null)
        {
            // This means it was able to save it where we asked
            Toast.makeText(this, "Image saved", Toast.LENGTH_SHORT).show();
            photoUri = fileUri;
        }
        else
            {
            // This means it wasn't able, so I'm gonna print the path for you to see
            Toast.makeText(this, "Image saved to: " + data.getData(), Toast.LENGTH_SHORT).show();
            photoUri = data.getData();
        }
        try
        {
            // We have to use the one here, anyway
            Bitmap cameraImage = MediaStore.Images.Media.getBitmap(this.getContentResolver(), photoUri);
            // At this point, we have the image from the camera.
            imageView.setImageBitmap(cameraImage);
        }
        catch (FileNotFoundException fnfe)
        {
            fnfe.printStackTrace();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
    }

}
}

Android Studio将imageView上显示的图像保存到Gallery

0 个答案: