Question

我试图在片段内触发一个OnclickListener，以在父活动中执行某些任务。但是由于某种原因，listener方法中的代码无效。吐司和日志均未显示。我不太确定如何将侦听器附加到按钮，因此在实现View.OnclickListener接口时，也许我错过了一些东西。请帮忙。

父母活动：

package app2.tarun.com.fragments2;


import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class AdminPanel extends AppCompatActivity implements 
FragmentChangePassword.OnButtonClickedListener{

private String password, c_password;
EditText et_password, et_c_password;
DataBaseHelper db;
Button btn_change_password;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate (savedInstanceState);
    setContentView (R.layout.admin_panel);
    btn_change_password = findViewById (R.id.btn_changePassword);
    et_password =  findViewById (R.id.admin_input_password);
    et_c_password =  findViewById (R.id.admin_input_reEnterPassword);
    db=  new DataBaseHelper (this);

}


public void changeFragment(View view) {
    Fragment fragment;

    if (view == findViewById (R.id.register)) {
        fragment = new FragmentRegisterUser ();
        FragmentManager fm = getSupportFragmentManager ();
        FragmentTransaction ft = fm.beginTransaction ();
        ft.replace (R.id.fragment, fragment);
        ft.commit ();
    }

    if (view == findViewById (R.id.change_password)) {

        Log.e("mmmmmmmmmm","ssssssssss");
        Toast.makeText (this, "Hello", Toast.LENGTH_LONG).show ();

        fragment = new FragmentChangePassword ();
        FragmentManager fm = getSupportFragmentManager ();
        FragmentTransaction ft = fm.beginTransaction ();
        ft.replace (R.id.fragment, fragment);
        ft.commit ();
    }


}



@Override
public void onButtonClicked() {
    Log.e("mmmmmmmmmm","ssssssssss");
    Toast.makeText (this, "vdsfds", Toast.LENGTH_LONG).show ();
    password = et_password.getText ().toString ();
    c_password = et_c_password.getText ().toString ();
    if (password.equals (c_password)) {
        db.changePassword (password);
        finish ();
    } else
        Toast.makeText (this, "vdsfds", Toast.LENGTH_LONG).show ();
}

}

片段活动：

package app2.tarun.com.fragments2;


import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

public class FragmentChangePassword extends Fragment implements View.OnClickListener {



OnButtonClickedListener mCallback;
Button btn_change_password;




@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    return inflater.inflate(R.layout.fragment_fragment_change_password, container, false);

}

@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated (view, savedInstanceState);

    mCallback = (OnButtonClickedListener) getActivity ();
    btn_change_password = getActivity ().findViewById (R.id.btn_changePassword);


}

@Override
public void onClick(View view) {
    Log.e("mmmmmmmmmm","ssssssssss");
    if(view.getId ()==R.id.btn_changePassword) {
        mCallback.onButtonClicked ();
    }
}


public interface OnButtonClickedListener {
    void onButtonClicked();
}

}

Answer 1

我不太确定如何将侦听器附加到按钮，因此在实现View.OnclickListener接口时，也许我错过了一些东西

在Fragment上实现View.OnclickListener时，还需要将侦听器设置为View。

您需要执行以下操作：

btn_change_password.setOnClickListener(this);

this是指已经实现View.OnclickListener

的Fragment

就您的活动而言，我怀疑您在活动的XML中使用了android:onClick。因此，当您的XML中包含以下内容时：

<Button
    ...
    android:onClick="changeFragment">

</Button>

您的点击将起作用，因为您在“活动”中使用以下方法：

public void changeFragment(View view) {
  ...
}

无法在片段内使用onClickListener

1 个答案: