java - Android Nougat 中具有共享 Intent 的 NullPointerException

Question

目前，我正在尝试创建一个共享 Intent，以便在您单击“共享”按钮共享图像时在 Android 应用程序本身中调用。但是，随着 Android Nougat 中 Sharing Intents 功能的改变，我在这一行收到 NullPointerException:

Uri uImageFile = FileProvider.getUriForFile(DetailActivity.this, DetailActivity.this.getApplicationContext().getPackageName(), imageFile);

这是我收到的错误:

java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.XmlResourceParser android.content.pm.ProviderInfo.loadXmlMetaData(android.content.pm.PackageManager, java.lang.String)' on a null object reference
                                                                               at android.support.v4.content.FileProvider.parsePathStrategy(FileProvider.java:584)
                                                                               at android.support.v4.content.FileProvider.getPathStrategy(FileProvider.java:558)
                                                                               at android.support.v4.content.FileProvider.getUriForFile(FileProvider.java:400)

这是我的 Share Intent 方法的完整代码:

private void shareIntent() {
    Intent sharingIntent = new Intent(Intent.ACTION_SEND);
    sharingIntent.setType("image/jpg");
    File imageFile = new File(data.get(pos).getUrl());
    Uri uImageFile = FileProvider.getUriForFile(DetailActivity.this, DetailActivity.this.getApplicationContext().getPackageName(), imageFile);
    sharingIntent.putExtra(Intent.EXTRA_STREAM, uImageFile);
    startActivity(Intent.createChooser(sharingIntent, getResources().getText(R.string.share_to)));
}

data.get(pos).getUrl() 返回我创建的实现了 Parcelable 的自定义类的 URL，当打印出来时，它返回一个目录像下面这样: “/storage/emulated/0/Pictures/primitive/Primitive-79538313.jpg”

感谢您提供的任何帮助!

Answer 1

将你的代码改成这样

private void shareIntent() {
     Intent shareIntent = new Intent(Intent.ACTION_SEND);
     shareIntent.setType("image/jepg");
     shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.parse("file://"+data.get(pos).getUrl()));
     startActivity(Intent.createChooser(shareIntent, "Share image"));
}

将此代码添加到您的 Activity onCreate()

StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
StrictMode.setVmPolicy(builder.build());