如何用 intent.ACTION_VIEW 显示图像

Question

我的语法在 android 5.1 可以运行但在 android 7.1 就不行....

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。提前谢谢你....

Answer 1

试试这个，

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" />

Answer 2

只需完成以下link

Answer 3

步骤如下

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，示例内容如下

<?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中创建图像文件，路径如下

  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"));

如何用 intent.ACTION_VIEW 显示图像

How to display image with intent.ACTION_VIEW

android

android-intent

android-5.1.1-lollipop

android-7.1-nougat