java按钮只有在一个接一个地使用时才起作用

5 月 Questions & Answers 63

所以我在一个活动中有多个按钮，我只能一个接一个地使用它们。我已经读到我需要对（OnClickListener）部分做些什么，但我不确定做什么或如何做。非常感谢您的帮助。代码如下：

import 安卓.content.Intent;
import 安卓.support.v7.app.AppCompatActivity;
import 安卓.os.Bundle;
import 安卓.view.View;
import 安卓.widget.Button;

public class Main2Activity extends AppCompatActivity {

private Button B3;
private Button B4;
private Button B5;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);

    B3 = findViewById(R.id.button3);

    B3.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            moveToDanceScheduleMenu();
        }
    });
}
private void moveToDanceScheduleMenu () {

    Intent intent = new Intent(Main2Activity.this, DanceScheduleMenu.class);
    startActivity(intent);

    B4 = findViewById(R.id.button10);

    B4.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            moveToWhatsOn();
        }
    });
}
private void moveToWhatsOn () {

    Intent intent = new Intent(Main2Activity.this, WhatsOn.class);
    startActivity(intent);

    B5 = findViewById(R.id.button11);

    B5.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            moveToMainResultsMenu();
        }
    });
}

编辑：感谢大家此刻的帮助，所以当我回家后，我会测试这些。它们看起来和我读到的非常相似，所以应该有用。。谢谢

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共 (6) 个答案

# 1 楼答案

您正在按顺序设置单击侦听器。如果希望所有按钮都可以随时单击，请将侦听器移动到onCreate()中：

protected void onCreate() {
    B3.setOnClickListener(){};
    B4.setOnClickListner(){};
    // etc.
}

点击监听器就是这样——它“监听”点击。例如，您的B3是创建活动时唯一正在侦听的按钮，因此所有其他按钮都将忽略您对它们的单击。单击B3时，将调用moveToDanceScheduleMenu()，并且B4开始侦听

我希望这能把事情弄清楚一点

完整代码：

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

public class Main2Activity extends AppCompatActivity {
    private Button B3;
    private Button B4;
    private Button B5;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        B3 = findViewById(R.id.button3);
        B3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                moveToDanceScheduleMenu();
            }
        });

        B4 = findViewById(R.id.button10);
        B4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                moveToWhatsOn();
            }
        });

        B5 = findViewById(R.id.button11);
        B5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                moveToMainResultsMenu();
            }
        });
    }
    private void moveToDanceScheduleMenu () {
        Intent intent = new Intent(Main2Activity.this, DanceScheduleMenu.class);
        startActivity(intent);
    }

    private void moveToWhatsOn () {
        Intent intent = new Intent(Main2Activity.this, WhatsOn.class);
        startActivity(intent);
    }
}

# 2 楼答案

有几种与按钮交互的方式：

第一种方法：类实现

public class Main2Activity extends AppCompatActivity implements OnClickListener {
private Button B3;
private Button B4;
private Button B5;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);

B3 = findViewById(R.id.button3);
B4 = findViewById(R.id.button10);
B5 = findViewById(R.id.button11);
B3.setOnClickListener(this);
B4.setOnClickListener(this);
B5.setOnClickListener(this);
}

public void onClick(View v){

 if(v.getId()==B3.getId()){
    moveToDanceScheduleMenu();
  }else if(v.getId()==B4.getId()){
    moveToWhatsOn();
  }else if(v.getId()==B5.getId()){
    moveToMainResultsMenu();
  }
}

private void moveToDanceScheduleMenu () {
Intent intent = new Intent(Main2Activity.this,DanceScheduleMenu.class);
startActivity(intent);
}

private void moveToWhatsOn () {
Intent intent = new Intent(Main2Activity.this, WhatsOn.class);
startActivity(intent);
}

第二种方法：私有变量（大块）

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);

findViewById(R.id.button3).setOnClickListener(mGlobal_OnClickListener);
findViewById(R.id.button10).setOnClickListener(mGlobal_OnClickListener);
findViewById(R.id.button11).setOnClickListener(mGlobal_OnClickListener);

}

//Global On click listener for all views
final OnClickListener mGlobal_OnClickListener = new OnClickListener() {
    public void onClick(final View v) {
        switch(v.getId()) {
            case R.id.button3:
            moveToDanceScheduleMenu();                   
            break;

            case R.id.button10:
            moveToWhatsOn();                   
            break;

            case R.id.button11:
            moveToDanceScheduleMenu();                   
            break;
        }
    }
};

private void moveToDanceScheduleMenu () {
Intent intent = new Intent(Main2Activity.this,DanceScheduleMenu.class);
startActivity(intent);
}

private void moveToWhatsOn () {
Intent intent = new Intent(Main2Activity.this, WhatsOn.class);
startActivity(intent);
}

第三种方法：在线（小块）

public class Main2Activity extends AppCompatActivity{

private Button B3;
private Button B4;
private Button B5;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);

 B3 = findViewById(R.id.button3);
 B4 = findViewById(R.id.button10);
 B5 = findViewById(R.id.button11);

 B3.setOnClickListener( new View.OnClickListener() {
 @Override
 public void onClick(View v) {
     moveToDanceScheduleMenu();
    }
  });

 B4.setOnClickListener( new View.OnClickListener() {
 @Override
 public void onClick(View v) {
     moveToWhatsOn();
   }
  });

 B5.setOnClickListener( new View.OnClickListener() {
 @Override
 public void onClick(View v) {
     moveToDanceScheduleMenu();
   }
  });

}

private void moveToDanceScheduleMenu () {
Intent intent = new Intent(Main2Activity.this,DanceScheduleMenu.class);
startActivity(intent);
}

private void moveToWhatsOn () {
Intent intent = new Intent(Main2Activity.this, WhatsOn.class);
startActivity(intent);
}

# 3 楼答案

我认为这个代码是有用的

public class Main2Activity extends AppCompatActivity {

private Button B3;
private Button B4;
private Button B5;
private a=false,b=false;
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main2);

    B3 = findViewById(R.id.button3);

    B3.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            moveToDanceScheduleMenu();
             a=true ;
        }
    });
}
private void moveToDanceScheduleMenu () {

    Intent intent = new Intent(Main2Activity.this, DanceScheduleMenu.class);
    startActivity(intent);


}
 B4 = findViewById(R.id.button10);

    B4.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
          if(a==true ){
            moveToWhatsOn();
           } 
        }
    });
private void moveToWhatsOn () {

    Intent intent = new Intent(Main2Activity.this, WhatsOn.class);
    startActivity(intent);
        b=true ;
    B5 = findViewById(R.id.button11);
}

    B5.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
           if(b==true){
            moveToMainResultsMenu();
}
        }
    });
}

# 4 楼答案

您正在按顺序制作与其他按钮相关的按钮。在oncreate中尝试绑定按钮及其OnclickListners。像这样

@Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main2);

            B3 = findViewById(R.id.button3);
            B4 = findViewById(R.id.button10);
            B5 = findViewById(R.id.button11);


            B3.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    moveToDanceScheduleMenu();
                }
            });

            B4.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    moveToWhatsOn();
                }
            });

            B5.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    moveToMainResultsMenu();
                }
            }); 
        }

# 5 楼答案

您可以像这样将所有代码放在OnCreate（）方法中

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

public class Main2Activity extends AppCompatActivity {

    private Button B3;
    private Button B4;
    private Button B5;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        B3 = findViewById(R.id.button3);
        B4 = findViewById(R.id.button10);
        B5 = findViewById(R.id.button11);

        B3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Main2Activity.this, DanceScheduleMenu.class);
                startActivity(intent);
            }
        });

        B4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Main2Activity.this, WhatsOn.class);
                startActivity(intent);
            }
        });

        B5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                moveToMainResultsMenu();
            }
        });

    }

# 6 楼答案

如果只想在按下上一个按钮后才使用按钮，则应在onCreate()方法的开头禁用所有下一个按钮，并在以后按下上一个按钮时启用它们

  B3.setEnabled(true);
  B4.setEnabled(false);
  B5.setEnabled(false);

然后在onClick之后启用“下一步”按钮

        B3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                moveToDanceScheduleMenu();
                B4.setEnabled(true);
            }
        });

至于你的代码

public class Main2Activity extends AppCompatActivity {

    private Button B3;
    private Button B4;
    private Button B5;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);

        B3 = findViewById(R.id.button3);
        B4 = findViewById(R.id.button10);
        B5 = findViewById(R.id.button11);



        B3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                moveToDanceScheduleMenu();

            }
        });


        B4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                moveToWhatsOn();
            }
        });


        B5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                moveToMainResultsMenu();
            }
        });
    }

    private void moveToDanceScheduleMenu() {

        Intent intent = new Intent(Main2Activity.this, DanceScheduleMenu.class);
        startActivity(intent);


    }

    private void moveToWhatsOn() {

        Intent intent = new Intent(Main2Activity.this, WhatsOn.class);
        startActivity(intent);


    }
}

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