Question

MainActivity.java

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends Activity {

protected void onCreate(Bundle paramBundle) {
    super.onCreate(paramBundle);
    setContentView(R.layout.lr);
new PINT();
}


}

Pint.java

public class Pint {

puclic void Pint()
{
}

public void PINT(View view) {
    switch (view.getId()) {
    case (R.id.rightleft):
        X(0);
        break;
    case (R.id.rightleft):
        X(1);
        break;
    }
}

public void X(int x) {
    if (x == 0) Toast.makeText(getApplicationContext(), "Left",
                    Toast.LENGTH_SHORT).show();
    if (x == 1) Toast.makeText(getApplicationContext(), "Right",
                    Toast.LENGTH_SHORT).show();
        }
    }
}

}

运行上面的代码失败，我希望能够使用类文件中的onclicklister，我将如何做到这一点？

xml中的所有内容只是两个按钮

Answer 1

这是我的建议：

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

     protected void onCreate(Bundle paramBundle) {
          super.onCreate(paramBundle);
          setContentView(R.layout.lr);
     }

     @Override
     public void onClick(View v) {
          switch (view.getId()) {
               case (R.id.rightleft):
                    X(0);
                    break;
               case (R.id.rightleft):
                    X(1);
                    break;
          }
     }

     public void X(int x) {
          (x == 0) 
               Toast.makeText(getApplicationContext(), "Left",      
               Toast.LENGTH_SHORT).show();
          (x == 1) 
               Toast.makeText(getApplicationContext(), "Right",
               Toast.LENGTH_SHORT).show();
     }
}

Answer 2

类文件必须扩展其中一个View类才能使OnClickListener正常工作。

除此之外，这是什么？（

public void X(int x) {
(x == 0) Toast.makeText(getApplicationContext(), "Left",
                Toast.LENGTH_SHORT).show();
(x == 1) Toast.makeText(getApplicationContext(), "Right",
                Toast.LENGTH_SHORT).show();
    }

如果是statemens：

，我猜你错过了

public void X(int x) {
if(x == 0) {Toast.makeText(getApplicationContext(), "Left",
                Toast.LENGTH_SHORT).show();}
else
if(x == 1) {Toast.makeText(getApplicationContext(), "Right",
                Toast.LENGTH_SHORT).show();}
}

Android：如何在类文件中使用Onclicklistener

2 个答案: