Android 将图像从图像视图保存到内部/外部设备存储器

我是本地android开发的新手。我正在android studio上工作，并初始化选项卡式活动。第一个选项卡用于地图，第二个选项卡用于相机。对于相机，我使用图像视图和一个按钮来打开相机。目前，我可以在图像视图中查看当前拍摄的图像，但我希望将其保存到内部/外部设备存储器中。为此，我搜索了下面的许多文章

但找不到好的解决办法。此外，我正在使用片段来实现这一点。 下面是我的舱单

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.accurat.faisal">

<permission android:name="com.example.accurat.faisal.permission.MAPS_RECEIVE"
    android:protectionLevel="signature"/>

<uses-permission android:name="com.example.accurat.faisal.permission.MAPS_RECEIVE"/>
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.hardware.camera"/>
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>



<uses-feature
    android:glEsVersion="0x00020000"
    android:required="true"
    />


<application
     android:name="android.support.multidex.MultiDexApplication"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <meta-data
        android:name="com.google.android.geo.API_KEY"
        android:value="MY_KEY"
        />

    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

下面是我的简历

import static android.Manifest.permission.CAMERA;
import static android.Manifest.permission.RECORD_AUDIO;
import static android.Manifest.permission.WRITE_EXTERNAL_STORAGE;
import static android.Manifest.permission.READ_EXTERNAL_STORAGE;

我已经学习了如何保存图像，但不能很好地理解它。我肯定错过了一些我不知道的东西

任何帮助都将不胜感激

请在onActivityResult中尝试此代码

要保存图像，请执行以下操作：

 private void SaveImage(Bitmap finalBitmap) {

    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + "/saved_images");    
    myDir.mkdirs();
    Random generator = new Random();
    int n = 10000;
    n = generator.nextInt(n);
    String fname = "Image-"+ n +".jpg";
    File file = new File (myDir, fname);
    if (file.exists ()) file.delete (); 
    try {
           FileOutputStream out = new FileOutputStream(file);
           finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
           out.flush();
           out.close();

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

使用此方法进行权限检查：

    public  boolean isStoragePermissionGranted() {
    if (Build.VERSION.SDK_INT >= 23) {
        if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
                == PackageManager.PERMISSION_GRANTED) {
            Log.v(TAG,"Permission is granted");
            return true;
        } else {

            Log.v(TAG,"Permission is revoked");
            ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 2);
            return false;
        }
    }
    else { //permission is automatically granted on sdk<23 upon installation
        Log.v(TAG,"Permission is granted");
        return true;
    }
}

在onActivityResult中尝试此代码

要保存图像，请执行以下操作：

 private void SaveImage(Bitmap finalBitmap) {

    String root = Environment.getExternalStorageDirectory().toString();
    File myDir = new File(root + "/saved_images");    
    myDir.mkdirs();
    Random generator = new Random();
    int n = 10000;
    n = generator.nextInt(n);
    String fname = "Image-"+ n +".jpg";
    File file = new File (myDir, fname);
    if (file.exists ()) file.delete (); 
    try {
           FileOutputStream out = new FileOutputStream(file);
           finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
           out.flush();
           out.close();

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

使用此方法进行权限检查：

    public  boolean isStoragePermissionGranted() {
    if (Build.VERSION.SDK_INT >= 23) {
        if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)
                == PackageManager.PERMISSION_GRANTED) {
            Log.v(TAG,"Permission is granted");
            return true;
        } else {

            Log.v(TAG,"Permission is revoked");
            ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 2);
            return false;
        }
    }
    else { //permission is automatically granted on sdk<23 upon installation
        Log.v(TAG,"Permission is granted");
        return true;
    }
}

---

首先，onActivityResult出现问题，您不需要将位图->流->位图使用bitap从原意转换为保存图像

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE)
    {
        if (resultCode == Activity.RESULT_OK)
        {
            Bitmap bmp = (Bitmap)data.getExtras().get("data");
            imageView.setImageBitmap(bmp);

            // here try to inovke saveImageMethod
        }
    }
}

public void saveImage(Bitmap bmp, String filename)
{
    FileOutputStream out = null;
    try {
        out = new FileOutputStream(filename);
        bmp.compress(Bitmap.CompressFormat.PNG, 100, out); // bmp is your Bitmap instance
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if (out != null) {
                out.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

但请记住询问外部存储许可。如果您希望共享此文件，则必须使用FileProvider api。有关更多信息，请查看

---

首先，ONACTIVITY结果出错，您不需要转换位图->流->位图使用bitap来保存图像

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE)
    {
        if (resultCode == Activity.RESULT_OK)
        {
            Bitmap bmp = (Bitmap)data.getExtras().get("data");
            imageView.setImageBitmap(bmp);

            // here try to inovke saveImageMethod
        }
    }
}

public void saveImage(Bitmap bmp, String filename)
{
    FileOutputStream out = null;
    try {
        out = new FileOutputStream(filename);
        bmp.compress(Bitmap.CompressFormat.PNG, 100, out); // bmp is your Bitmap instance
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        try {
            if (out != null) {
                out.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

但请记住询问外部存储许可。如果您希望共享此文件，则必须使用FileProvider api。有关更多信息，请查看

---

您可以使用以下代码将图像保存在内部存储器中

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE)
{
    if (resultCode == Activity.RESULT_OK)
    {
        Bitmap bmp = (Bitmap)data.getExtras().get("data");
        ByteArrayOutputStream stream = new ByteArrayOutputStream();

        bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
        byte[] byteArray = stream.toByteArray();

        //saving image into internal storage

        File myfile = new File(Environment.getExternalStorageDirectory(),"yourfilename.jpg");

        FileOutputStream fo;
        try {
            myfile.createNewFile();
            fo = new FileOutputStream(myfile);
            fo.write(byteArray);
            fo.flush();
            fo.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // convert byte array to Bitmap

        Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray, 0,
                byteArray.length);

        imageView.setImageBitmap(bitmap);

    }
  }
}

---

您可以使用以下代码将图像保存在内部存储器中

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE)
{
    if (resultCode == Activity.RESULT_OK)
    {
        Bitmap bmp = (Bitmap)data.getExtras().get("data");
        ByteArrayOutputStream stream = new ByteArrayOutputStream();

        bmp.compress(Bitmap.CompressFormat.PNG, 100, stream);
        byte[] byteArray = stream.toByteArray();

        //saving image into internal storage

        File myfile = new File(Environment.getExternalStorageDirectory(),"yourfilename.jpg");

        FileOutputStream fo;
        try {
            myfile.createNewFile();
            fo = new FileOutputStream(myfile);
            fo.write(byteArray);
            fo.flush();
            fo.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        // convert byte array to Bitmap

        Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray, 0,
                byteArray.length);

        imageView.setImageBitmap(bitmap);

    }
  }
}

---

我会尝试一下，然后回复您：我必须排除onActivityResult中的所有代码？然后只放置IFisstoragepermissiongrated{SaveImagebitmap}？否..在将位图设置为图像后，写入上面的代码，它正在工作并保存到我的外部存储器中。但是我看不到任何保存图像的\u images文件夹名称？我会尝试一下，然后回复您：我必须排除onActivityResult中的所有代码？然后只放置IFisstoragepermissiongrated{SaveImagebitmap}？否..在将位图设置为图像后，写入上面的代码，它正在工作并保存到我的外部存储器中。但是我看不到任何已保存的图像文件夹名称，图像保存在哪里？