当我调用这个AlertDialog时它变空了

Question

当我调用此警报对话框时，它显示为空，由于某种原因，视图未显示，而不是仅向我显示带有应用程序名称和单词＆＃34;关于＆＃34;但视图现在显示：

public class AboutBox {
static String VersionName(Context context) {
    try {
        return context.getPackageManager().getPackageInfo(context.getPackageName(),0).versionName;
    } catch (PackageManager.NameNotFoundException e) {
        return "Unknown";
    }
}
public static void Show(Activity callingActivity) {
    //Use a Spannable to allow for links highlighting
    SpannableString aboutText = new SpannableString("Version " + VersionName(callingActivity)+ "nn"
            + callingActivity.getString(R.string.about));
    //Generate views to pass to AlertDialog.Builder and to set the text
    View about;
    TextView tvAbout;
    try {
        //Inflate the custom view
        LayoutInflater inflater = callingActivity.getLayoutInflater();
        about = inflater.inflate(R.layout.aboutbox, (ViewGroup) callingActivity.findViewById(R.id.aboutView));
        tvAbout = (TextView) about.findViewById(R.id.aboutText);
    } catch(InflateException e) {
        //Inflater can throw exception, unlikely but default to TextView if it occurs
        about = tvAbout = new TextView(callingActivity);
    }
    //Set the about text
    tvAbout.setText(aboutText);
    // Now Linkify the text
    Linkify.addLinks(tvAbout, Linkify.ALL);
    //Build and show the dialog
    new AlertDialog.Builder(callingActivity)
            .setTitle("About " + callingActivity.getString(R.string.app_name))
            .setCancelable(true)
            .setIcon(R.drawable.ic_launcher)
            .setPositiveButton("OK", null)
            .setView(about)
            .show();    //Builder method returns allow for method chaining
}

}

Answer 1

在调用callingActivity期间将getApplicationContext()替换为getString()，如下所示：

new AlertDialog.Builder(callingActivity)
            .setTitle("About " + getApplicationContext().getString(R.string.app_name))
            .setCancelable(true)
            .setIcon(R.drawable.ic_launcher)
            .setPositiveButton("OK", null)
            .setView(about)
            .show();