单击按钮时如何打印消息 [英] How do I print the message when I click the button

问题描述

package com.example.button;



import android.support.v7.app.AppCompatActivity;

import android.os。捆绑;

导入android.view.View;

导入android.widget.Button;

导入android.widget.Toast;



公共类MainActivity扩展AppCompatActivity {



按钮按钮;





@Override

protected void onCreate（Bundle savedInstanceState）{

super.onCreate（savedInstanceState）;

setContentView（R.layout.activity_main）;



button =（Button）findViewById（R.id.button）;





}



@Override

protected void onClick（查看视图） {b


button.setOnClickListener（new View.OnClickListener（））;

Toast t = Toast.makeText（MainActivity.this，U HAV e点击我，Toast.LENGTH_LONG）;

t.show（）;



}

< br $>


}





我写了这段代码，这样当我按按钮我的外出将是-U已经点击了我



我尝试了什么：



package com.example.button;



import android.support.v7.app.AppCompatActivity;

import android.os .Bundle;

导入android.view.View;

导入android.widget.Button;

导入android.widget.Toast;



公共类MainActivity扩展AppCompatActivity {



按钮按钮;





@Override

protected void onCreate（Bundle savedInstanceState）{

super.onCreate（savedInstanceState）;

setContentView（R.layout.activity_main）;



button =（Button）fin dViewById（R.id.button）;





}



@Override

protected void onClick（查看视图）{



button.setOnClickListener（new View.OnClickListener（））;

Toast t = Toast.makeText（MainActivity.this，U Have Clicked Me，Toast.LENGTH_LONG）;

t.show（）;

< br $>
}





}

package com.example.button;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

Button button;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

button = (Button) findViewById(R.id.button);


}

@Override
protected void onClick(View view) {

button.setOnClickListener(new View.OnClickListener());
Toast t = Toast.makeText(MainActivity.this, "U Have Clicked Me", Toast.LENGTH_LONG);
t.show();

}


}


I wrote this code so that when i press the button my outout will be-U Have Clicked Me

What I have tried:

package com.example.button;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

Button button;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

button = (Button) findViewById(R.id.button);


}

@Override
protected void onClick(View view) {

button.setOnClickListener(new View.OnClickListener());
Toast t = Toast.makeText(MainActivity.this, "U Have Clicked Me", Toast.LENGTH_LONG);
t.show();

}


}

推荐答案

您错过了将 setOnClickListener 设置为按钮。

You missed to set setOnClickListener to button.

   public class MainActivity extends AppCompatActivity implements View.OnClickListener{

   Button button;

   @Override
   protected void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.activity_main);

   button = (Button) findViewById(R.id.button);
   button.setOnClickListener(this); // add this line
  }

  @Override
  protected void onClick(View view) {
    Toast t = Toast.makeText(MainActivity.this, "U Have Clicked Me",Toast.LENGTH_LONG);
    t.show();
  }
}

此外，请格式化您的代码，使其更具可读性。

And also, please format your code nicely so it more readable.

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