将图像从 ImageView 保存到内部存储

Question

我创建了一个 ImageView，我可以看到相机的预览，并将捕获的图像加载到 ImageView 中，我想将图像存储到内存中的一个目录中。我参考了很多帖子并尝试过，但我在内存中找不到我的图片。

这是我用过的代码：

package com.example.shravan.camera;

import android.content.Context;
import android.content.ContextWrapper;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;

public class MainActivity extends AppCompatActivity {

    private final String TAG = "abc";

    static final int REQUEST_IMAGE_CAPTURE =1 ;
    ImageView iv;
    Uri imageUri;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn = (Button)findViewById(R.id.myB);
        iv = (ImageView) findViewById(R.id.myIV);
        //disable the button if the user has no camera
        if (!hasCamera()) {
            btn.setEnabled(false);
        }
    }

    public boolean hasCamera() {
        return getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA_ANY);
    }

    //on click event handler that launches the camera
    public void launchCamera(View v) {
        Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
        startActivityForResult(i, REQUEST_IMAGE_CAPTURE);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
            imageUri=data.getData();
            iv.setImageURI(imageUri);;
        }
    }

    public void SaveFile(View v) {
        BitmapDrawable drawable = (BitmapDrawable) iv.getDrawable();
        Bitmap bitmap = drawable.getBitmap();

        print("Creating cw");
        ContextWrapper cw = new ContextWrapper(this.getApplicationContext());
        print("Creating dir");
        File directory = cw.getDir("ImagesDir", Context.MODE_PRIVATE);
        print("Created dir" + directory);
        File mypath = new File(directory,"myImagesDGS.jpg");
        print("path is" + mypath);

        FileOutputStream fos = null;
        try {
            print("creating fos");
            fos = new FileOutputStream(mypath);
            print("Compressing bitmap");
            bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                fos.close();
                print("fos closed");
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    private void print(String str){
        Log.d(TAG, str);
    }

}

我制作了许多要调试的日志消息，但我得到了一条在 phone 中找不到的路径。

这是logcat:

08-07 21:47:37.089 11030-11030/com.example.shravan.camera D/abc: Creating cw 08-07

21:47:37.089 11030-11030/com.example.shravan.camera D/abc: Creating dir 08-07

21:47:37.099 11030-11030/com.example.shravan.camera D/abc: Created dir/data/user/0/com.example.shravan.camera/app_ImagesDir 08-07

21:47:37.099 11030-11030/com.example.shravan.camera D/abc: path is/data/user/0/com.example.shravan.camera/app_ImagesDir/myImagesDGS.jpg

08-07 21:47:37.099 11030-11030/com.example.shravan.camera D/abc: creating fos

08-07 21:47:37.099 11030-11030/com.example.shravan.camera D/abc: Compressing bitmap

08-07 21:47:42.589 11030-11030/com.example.shravan.camera D/abc: fos closed

有什么我需要检查并且应该更改的吗？请帮忙！

Answer 1

您的图像正在从该路径保存/data/user/0/com.example.shravan.camera/app_ImagesDir/myImagesDGS.jpg 但你不是 access.try iamge 的代码 reading.Call 这个方法到 onCreate 这个方法是 return 你位图。

 Bitmap mBitmap= getImageBitmap(this,"myImagesDGS","jpg");

   if(mBitmap !=null){

yourImageView.setBitmap(mBitmap);

}else{

Log.d("MainActivity","Image is not found");
}

是sepread方法

     public Bitmap getImageBitmap(Context context,String name,String extension){
        name=name+"."+extension;  
        try{ 
            FileInputStream fis = context.openFileInput(name);
                Bitmap b = BitmapFactory.decodeStream(fis);
                fis.close();
                return b;
            } 
            catch(Exception e){
            } 
            return null; 
        }

Answer 2

试试这个。我修改了我的代码以适合您提供的代码。我没有测试它。我将拍摄的照片临时存储到一个带有时间戳的文件中，然后使用文件名来检索文件。希望对你有帮助

private Uri mImageCaptureUri;
public void launchCamera(View v)
{
    //Intent i = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    //startActivityForResult(i, REQUEST_IMAGE_CAPTURE);

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
                    mImageCaptureUri = Uri.fromFile(new File(Environment.getExternalStorageDirectory(),
                            "tmp_avatar_" + String.valueOf(System.currentTimeMillis()) + ".jpg"));

                    intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri);
}


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

if (mImageCaptureUri!=null){
//Do whatever you want with the uri
}

}
}

Answer 3

使用该代码，您将结束将文件存储到您的私人应用程序数据。 除了您的应用程序本身，如果没有 root 访问权限，您将无法使用其他应用程序访问该数据。如果您希望图像文件可以被其他应用程序访问，您可以在声明文件路径时使用此代码获取 public 图像目录。

File albumF;
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
    albumF = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM);
} else {
    albumF = context.getFilesDir();
}

如果你需要在public画廊目录中创建你的子目录，你可以像这样更改上面的代码：

File albumF;
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
    albumF = new File(Environment.getExternalStoragePublicDirectory(
            Environment.DIRECTORY_DCIM), YOUR_SUB_DIRECTORY_STRING);
} else {
    albumF = new File(context.getFilesDir(), YOUR_SUB_DIRECTORY_STRING);
}

您可能需要添加此代码才能创建该专辑目录

if (!albumF.exists()) {
    albumF.mkdirs();
}

Answer 4

您当前图像的保存位置，其他人无法访问 application.It 最好将它们保存在可访问的 location.try 中，例如这样..

BitmapDrawable drawable = (BitmapDrawable) iv.getDrawable();
Bitmap bitmap = drawable.getBitmap();
 try {
           String root = Environment.getExternalStorageDirectory().toString();
           File file = new File(root + "/YourDirectory/myImagesDGS.jpg");
           FileOutputStream out = new FileOutputStream(file);
           bitmap.compress(Bitmap.CompressFormat.PNG, 100, out);
           out.flush();
           out.close();

                                } catch (Exception ex) {
                                    ex.printStackTrace();
                                }

然后您可以像这样检索您保存的图像..

String root = Environment.getExternalStorageDirectory().toString();
  File file = new File(root + "/YourDirectory/myImagesDGS.jpg");    
Bitmap bmap=BitmapFactory.decodeFile(file.getAbsolutePath());

Answer 5

尝试使用 ImageSaver。这是一种从内部和外部存储中保存和加载图像的同步方式。

用法

保存：

new ImageSaver(context).
        setFileName("myImage.png").
        setDirectoryName("images").
        setExternal(true).
        save(bitmap);

要加载：

Bitmap bitmap = new ImageSaver(context).
        setFileName("myImage.png").
        setDirectoryName("images").
        setExternal(true).
        load();

Answer 6

成功了！

我使用这段代码在我的文件存储中创建了一个目录，然后存储图像：

FileOutputStream outStream = null;

// Write to SD Card
try {
    File sdCard = Environment.getExternalStorageDirectory();
    File dir = new File(sdCard.getAbsolutePath() + "/camtest");
    dir.mkdirs();

    String fileName = String.format("%d.jpg", System.currentTimeMillis());
    File outFile = new File(dir, fileName);

    outStream = new FileOutputStream(outFile);
    bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outStream);
    outStream.flush();
    outStream.close();

    Log.d(TAG, "onPictureTaken - wrote to " + outFile.getAbsolutePath());

    refreshGallery(outFile);
} catch (FileNotFoundException e) {
    print("FNF");
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
} finally {

}

我的权限：

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

最后，最重要的是：

转到设备设置>设备>应用程序>应用程序管理器>"your app">权限>启用存储权限！

Answer 7

@Shravan DG 提出的解决方案对我来说是错误的。我稍微修改了他的代码，没有错误。

 private void downloadQR()
{
    FileOutputStream outStream = null;
    
    try {
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
        String imageFileName = "QRCode_" + timeStamp + ".jpg";
        File storageDir = new File(Environment.getExternalStorageDirectory().toString(), "PARENT_DIR)/CHILD_DIR/");
        storageDir.mkdirs();

        File outFile = new File(storageDir, imageFileName);
        outStream = new FileOutputStream(outFile);
        BitmapDrawable drawable = (BitmapDrawable) qrCode.getDrawable();
        Bitmap bitmap = drawable.getBitmap();
        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outStream);
        outStream.flush();
        outStream.close();

        Log.d(TAG, "onPictureTaken - wrote to " + outFile.getAbsolutePath());

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } finally {

    }
}

镇痛丸:)

将图像从 ImageView 保存到内部存储

Saving an image from ImageView into internal storage

android

bitmap

android-imageview

internal-storage

用法