Android (Java): how to use LayoutInflater.inflate() for Dialogs?

问题

I'm using the LayoutInflater within a Dialog and don't know what to set as a 2nd parameter, which is null for now.

I found answers for onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle bundle), but that method isn't available for a Dialog.

Faking the null by something like (ViewGroup) null is not an option for me.

MyDialog

public class MyDialog extends Dialog implements View.OnClickListener {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        LayoutInflater inflater = LayoutInflater.from(getContext());
        View view               = inflater.inflate(R.layout.my_dialog, null); 
        // ________________ How to replace that null? ___________________^

        setContentView(view);
    }
}

Error reported by Infer:

MyDialog.java:42: error: ERADICATE_PARAMETER_NOT_NULLABLE
  `LayoutInflater.inflate(...)` needs a non-null value in parameter 2 but argument `null` can be null. (Origin: null constant at line 42).
  41.           LayoutInflater inflater = LayoutInflater.from(getContext());
  42. >         View view               = inflater.inflate(R.layout.dialog_unlock, null);

Any ideas? Thanks in advance!

Solution

public class MyDialog extends Dialog implements View.OnClickListener {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.my_dialog);

        Button myBtn         = findViewById(R.id.my_btn);
        EditText myTextField = findViewById(R.id.my_et);

        View.OnClickListener onClickMyBtn = v -> {
            String value = myTextField.getText().toString();
            Log.d("MyDialog", String.format("My value: %s", value));
            dismiss();
        };
        myBtn.setOnClickListener(onClickMyBtn);
    }
}

回答1:

Use this

setContentView(R.layout.my_dialog);

Instead of this

LayoutInflater inflater = LayoutInflater.from(getContext());
View view  = inflater.inflate(R.layout.my_dialog, null);
setContentView(view);

SAMPLE CODE

import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MyDialog extends Dialog implements View.OnClickListener {


    public MyDialog(Context context) {
        super(context);
    }

    Button myBtn;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.my_dialog);

        myBtn = findViewById(R.id.my_btn);
        myBtn.setOnClickListener(this);

    }

    @Override
    public void onClick(View view) {
        if (view == myBtn) {
            Toast.makeText(view.getContext(), "clicked", Toast.LENGTH_SHORT).show();
        }
    }
}

Then create your dialog like this

MyDialog myDialog = new MyDialog(this);
myDialog.show();

来源：https://stackoverflow.com/questions/54437625/android-java-how-to-use-layoutinflater-inflate-for-dialogs

标签

java

android

android-layout

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