1

我的语法可以在 android 5.1 上运行，但不能在 android 7.1 上运行......

File file = new File(Environment.getExternalStorageDirectory(), "Pictures/1481853170451.jpg");
Toast.makeText(MainActivity.this, file.getPath(), Toast.LENGTH_LONG).show();
Uri path = Uri.fromFile(file);

if (file.exists()) {
  Intent intent = new Intent();
  intent.setAction(android.content.Intent.ACTION_VIEW);
  intent.setDataAndType(path, "image/*");
  intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
try {                       
  this.startActivity(intent);
} catch (ActivityNotFoundException e) {
}

谁能告诉我可能的答案。先感谢您....

4

3 回答 3

4

以下是步骤

1) 在 AndroidManifest.xml 中，在应用程序标签内添加以下提供程序

 <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>

2) 在 res/xml 文件夹中创建 provider_paths.xml 并包含以下示例内容

<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android">
    <files-path name="internal_files" path="DATA/TITLE/"/>
</paths>

3）在Activity中创建图片文件，路径如下图

  context.getFilesDir() + File.separator + "DATA" + File.separator + "TITLE"+ File.separator + "sample_image_file"

4）使用以下代码打开图像文件

 Intent intent = new Intent();
            intent.setAction(Intent.ACTION_VIEW);
            Uri photoURI = FileProvider.getUriForFile(context,
                    BuildConfig.APPLICATION_ID + ".provider",
                    new File(context.getFilesDir() + File.separator + "DATA" + File.separator + "TITLE"+ File.separator + "sample_image_file"));
            intent.setDataAndType(photoURI,"image/*");
            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
            context.startActivity(Intent.createChooser(intent, "View using"));
于 2018-04-19T16:06:32.093 回答
0

尝试这个，

相机权限

    private static final int REQUEST_STORAGE = 112;


    btn.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                  if (Build.VERSION.SDK_INT >= 23) {
                        String[] PERMISSIONS = {android.Manifest.permission.WRITE_EXTERNAL_STORAGE, android.Manifest.permission.READ_EXTERNAL_STORAGE};
                        if (!hasPermissions(mContext, PERMISSIONS)) {
                            ActivityCompat.requestPermissions((Activity) mContext, PERMISSIONS, REQUEST_STORAGE );
                        } else {
                            getImage();
                        }
                    } else {
                        getImage();
                    }

                }
            });
        }

获取权限结果

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        switch (requestCode) {
            case REQUEST_STORAGE: {
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    getImage();
                } 
            }
        }
    }

检查棉花糖的权限

    private static boolean hasPermissions(Context context, String... permissions) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && context != null && permissions != null) {
            for (String permission : permissions) {
                if (ActivityCompat.checkSelfPermission(context, permission) != PackageManager.PERMISSION_GRANTED) {
                    return false;
                }
            }
        }
        return true;
    }

从外部存储中获取图像

    public void getImage()
    {
        File file = new File(Environment.getExternalStorageDirectory(), "Pictures/1481853170451.jpg");
        Toast.makeText(MainActivity.this, file.getPath(), Toast.LENGTH_LONG).show();
        Uri path = Uri.fromFile(file);

        if (file.exists()) {
          Intent intent = new Intent();
          intent.setAction(android.content.Intent.ACTION_VIEW);
          intent.setDataAndType(path, "image/*");
          intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        try {                       
          this.startActivity(intent);
        } catch (ActivityNotFoundException e) {
        }
    }

AndroidManifest.xml

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
于 2017-02-17T02:44:19.687 回答
0

只需通过以下链接

于 2017-02-17T04:44:14.977 回答