清单

$(document).ready(function () {

        $('#filesTable').DataTable({
            "order": [[0, "desc"]],
            "bProcessing": true,
            "bServerSide": true,
            "sServerMethod": "POST",
            "sAjaxSource": "files.aspx/fillFileTable"
        });
});


[WebMethod]
public static string fillFileTable()
{
   DataTable dt = //...(get table from database)

   JavaScriptSerializer js=new JavaScriptSerializer();  
   js.MaxJsonLength = int.MaxValue;  

   return js.Serialize(dt);

}

代码如下

<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_PROFILE" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<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="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CAMERA" />

logcat的

 collageImage.setImageBitmap(bmap1);
    Drawable mDrawable = collageImage.getDrawable();
    Bitmap bitmap = ((BitmapDrawable)mDrawable).getBitmap();
    File root = Environment.getExternalStorageDirectory();
    File cachePath = new File(root.getAbsolutePath() + "/DCIM/Camera/image.png");
    cachePath.mkdirs();
    try {
        cachePath.createNewFile();
        FileOutputStream ostream = new FileOutputStream(cachePath);
        bitmap.compress(Bitmap.CompressFormat.PNG, 100, ostream);
        ostream.close();
    } catch (Exception e) {
       e.printStackTrace();
    }
    Intent share = new Intent(Intent.ACTION_SEND);
    share.setType("image/png");
    share.putExtra(Intent.EXTRA_STREAM,
    Uri.parse("file:///sdcard/DCIM/Camera/image.png"));
    Intent openThree = new Intent(createChooser(share, "Share Image"));
    startActivity(openThree);
    Toast.makeText(v.getContext(), "Selected: ", Toast.LENGTH_LONG).show();

Gradle详情如下

06-18 13:47:36.906 4429-4429/com.austurn.keikonew.keiko W/System.err: java.io.IOException: Permission denied
        at java.io.UnixFileSystem.createFileExclusively0(Native Method)
        at java.io.UnixFileSystem.createFileExclusively(UnixFileSystem.java:280)
        at java.io.File.createNewFile(File.java:948)
06-18 13:47:36.907 4429-4429/com.austurn.keikonew.keiko W/System.err:     at com.austurn.keikonew.keiko.ThreeFragment$10.onClick(ThreeFragment.java:2122)
        at android.view.View.performClick(View.java:5637)
        at android.view.View$PerformClick.run(View.java:22429)
        at android.os.Handler.handleCallback(Handler.java:751)
        at android.os.Handler.dispatchMessage(Handler.java:95)
        at android.os.Looper.loop(Looper.java:154)
06-18 13:47:36.909 4429-4429/com.austurn.keikonew.keiko W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:6119)
        at java.lang.reflect.Method.invoke(Native Method)
06-18 13:47:36.911 4429-4429/com.austurn.keikonew.keiko W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
06-18 13:47:37.034 4429-4440/com.austurn.keikonew.keiko I/art: Background partial concurrent mark sweep GC freed 1063(81KB) AllocSpace objects, 0(0B) LOS objects, 3% free, 122MB/126MB, paused 26.566ms total 119.644ms
06-18 13:47:37.121 4429-4452/com.austurn.keikonew.keiko D/EGL_emulation: eglMakeCurrent: 0xa43052a0: ver 3 1 (tinfo 0xa43032a0)
06-18 13:47:40.471 4429-4452/com.austurn.keikonew.keiko D/EGL_emulation: eglMakeCurrent: 0xa43052a0: ver 3 1 (tinfo 0xa43032a0)

它适用于以前的版本和Android Studio早期版本。但问题发生在版本更新之后

Answer 1

对于上面的代码，您需要应用运行时读取和写入权限，并且您的目标是Nougat，这就是您需要使用文件提供程序应用读取路径权限的原因。并需要在Android Manifest中注册提供程序

选中此link

Answer 2

为Android 6.0（API级别23）及以上添加运行时权限代码，此处为official doc或您可以找到example here

这是WRITE_EXTERNAL_STORAGE

的代码

if (checkSelfPermission(android.Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
    Log.d(TAG,"Permission is granted");

    return true;
}

请求像这样的其他许可

ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CODE);

Answer 3

您必须为更新版本执行此操作：例如：

if (checkSelfPermission(Manifest.permission.CAMERA)
                        != PackageManager.PERMISSION_GRANTED || checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)!=PackageManager.PERMISSION_GRANTED || checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
                    requestPermissions(new String[]{Manifest.permission.CAMERA,Manifest.permission.READ_EXTERNAL_STORAGE,Manifest.permission.WRITE_EXTERNAL_STORAGE},
                            1);
                }
else {
                    Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
                    profile_file_name = "profile_" + System.currentTimeMillis() + ".jpg";
                    File f = new File(android.os.Environment.getExternalStorageDirectory(), profile_file_name);
                    intent.putExtra(MediaStore.EXTRA_OUTPUT, FileProvider.getUriForFile(getApplicationContext(), "com.example.hp.imageuploadapp.provider", f));
                    intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
                    intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);

                    startActivityForResult(intent, 1);
                }



public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (requestCode == 1) {
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED && grantResults[1] == PackageManager.PERMISSION_GRANTED && grantResults[2] == PackageManager.PERMISSION_GRANTED) {
            Toast.makeText(this, "camera permission granted", Toast.LENGTH_LONG).show();
            Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
            profile_file_name = "profile_" + System.currentTimeMillis() + ".jpg";
            File f = new File(android.os.Environment.getExternalStorageDirectory(), profile_file_name);
            intent.putExtra(MediaStore.EXTRA_OUTPUT, FileProvider.getUriForFile(getApplicationContext(), "com.example.hp.imageuploadapp.provider", f));
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            intent.addFlags(Intent.FLAG_GRANT_WRITE_URI_PERMISSION);

            startActivityForResult(intent, 1);} 
else {
            Toast.makeText(this, "camera permission denied", Toast.LENGTH_LONG).show();
        }


    }
}
<provider
        android:name="android.support.v4.content.FileProvider"
        android:authorities="${applicationId}.provider"
        android:exported="false"
        android:grantUriPermissions="true">
        <meta-data
            android:name="android.support.FILE_PROVIDER_PATHS"
            android:resource="@xml/provider_paths" />
</provider>

并在清单文件中添加以上内容

Answer 4

谢谢大家给我一些线索。我进行了全部搜索，并使其正常运行。我的代码如下

 Bitmap bitmap = ((BitmapDrawable)mDrawable).getBitmap();

                if (Build.VERSION.SDK_INT >= 23)
                {
                    if (checkPermission())
                    {

                        try {
                            File file = new File(getActivity().getExternalCacheDir(),"logicchip.png");
                            FileOutputStream fOut = new FileOutputStream(file);
                            bitmap.compress(Bitmap.CompressFormat.PNG, 100, fOut);
                            fOut.flush();
                            fOut.close();
                            file.setReadable(true, false);
                            final Intent intent = new Intent(android.content.Intent.ACTION_SEND);
                            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                            intent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));
                            intent.setType("image/png");
                            startActivity(Intent.createChooser(intent, "Share image via"));
                        } catch (Exception e) {
                            e.printStackTrace();
                        }

                    } else {
                        requestPermission(); // Code for permission
                    }
                }
                else
                {

                }


 private boolean checkPermission() {
        int result = ContextCompat.checkSelfPermission(getActivity(), android.Manifest.permission.WRITE_EXTERNAL_STORAGE);
        if (result == PackageManager.PERMISSION_GRANTED) {
            return true;
        } else {
            return false;
        }
    }


    private void requestPermission() {

        if (ActivityCompat.shouldShowRequestPermissionRationale(getActivity(), android.Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
            Toast.makeText(getActivity(), "Write External Storage permission allows us to do store images. Please allow this permission in App Settings.", Toast.LENGTH_LONG).show();
        } else {
            ActivityCompat.requestPermissions(getActivity(), new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
        }
    }




    @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case PERMISSION_REQUEST_CODE:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    Log.e("value", "Permission Granted, Now you can use local drive .");
                } else {
                    Log.e("value", "Permission Denied, You cannot use local drive .");
                }
                break;
        }
    }

图像视图中的图像在共享时仅显示黑色图像？

清单

4 个答案: