如何获取Activity的视图？

Question

我有下面的方法，我想显示一个Snackbar。问题是，我没有 activity view，而且我不知道如何获得它。在代码中，您会看到 Snackbar view 是 viewInflate_setup，但它不起作用。我知道它不起作用，因为这是我 alertdialog 的视图，而不是我当前的屏幕。我试过获取 root view 但 snackbar 显示在错误的位置（在这三个 android 按钮后面）。我如何获得我的活动 View？

public void confirmPassword(){
        final LayoutInflater inflateSetup = getLayoutInflater();
        final View viewInflate_setup = inflateSetup.inflate(R.layout.inflate_setup, null);

        AlertDialog.Builder alertSetup = new AlertDialog.Builder(this);
        alertSetup.setView(viewInflate_setup);
        final AlertDialog dialogSetup = alertSetup.create();
        dialogSetup.show();

        btnConfirmPassowod = (Button)viewInflate_setup.findViewById(R.id.btnConfirm);
        btnConfirmPassowod.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(final View v) {
                System.out.println("User has clicked the [confirm] button");
                dialogSetup.setCancelable(false);
                edtPassword3 = (EditText)viewInflate_setup.findViewById(R.id.edtPassword3);
                SUpassword3 = edtPassword3.getText().toString();

                final ParseUser beforeConfirmPassword = ParseUser.getCurrentUser();
                ParseUser.logInInBackground(beforeConfirmPassword.getUsername(), SUpassword3, new LogInCallback() {
                    @Override
                    public void done(ParseUser parseUser, ParseException e) {
                        if(e==null){
                            //password confirmed, go to next setup
                            System.out.println("Password [" +SUpassword3+ "] and user [" +beforeConfirmPassword.getUsername()+ "] confirmed, go to setup");
                            dialogSetup.dismiss();
                        }else{
                            //passwords don't match
                            System.out.println("Password don't match: [" +SUpassword3 + "] USER [" +beforeConfirmPassword.getUsername()+ "]");
                            Snackbar.make(viewInflate_setup, "Wrong password. Try again.", Snackbar.LENGTH_LONG)
                                    .setAction("Action", null).show();
                            dialogSetup.dismiss();
                        }
                    }
                });
            }
        });
    }

Answer 1

您唯一需要做的就是设置一个 id 您的根视图并创建它的一个实例。

activity_main.xml

<LineaLayout
  ...
  android:id="my_root">
  ...

</LinearLayout>

MainActivity

private LinearLayout mRootView;
onCreate(...){
  ...
  mRootView = (LinearLayout) findViewById(R.id.my_root);
  ... 
}

并且，在您的警报对话框中，只需创建一个小吃栏，例如：

Snackbar.make(mRootView, "Wrong password. Try again.", Snackbar.LENGTH_LONG).setAction("Action", null).show();

Answer 2

您可以使用 findViewById(android.R.id.content) 或 getWindow().getDecorView() 获取 activity

的根视图

即 Snackbar.make(findViewById(android.R.id.content), "Wrong password. Try again.", Snackbar.LENGTH_LONG).show(); 将完成这项工作。

如何获取Activity的视图？

How to get Activity's view?

java

android

android-alertdialog

android-view