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  • Android 加法程序

    xml:

    <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"     xmlns:tools="http://schemas.android.com/tools"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="#0099cc"     tools:context=".FullscreenActivity" >

        <HorizontalScrollView         android:background="#0099cc"         android:layout_width="fill_parent"         android:layout_height="fill_parent"         >        <LinearLayout         android:layout_width="wrap_content"         android:layout_height="fill_parent">

            <EditText             android:id="@+id/editNum1"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_gravity="center_vertical"             android:inputType="number"             android:text="0.0" />

            <TextView             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_gravity="center_vertical"             android:text="+" />

            <EditText             android:id="@+id/editNum2"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_gravity="center_vertical"             android:inputType="number"             android:text="0.0" />

            <Button             android:id="@+id/btEqualTo"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_gravity="center_vertical"             android:text="等于" />

            <TextView             android:id="@+id/txtResult"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:layout_gravity="center_vertical"             android:text="0.0" />

           </LinearLayout>     </HorizontalScrollView>

    </FrameLayout>

    java:

    package testPackage.example.testapp;
    import testPackage.example.testapp.util.SystemUiHider;
    import android.app.Activity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;
    /**
     * An example full-screen activity that shows and hides the system UI (i.e.
     * status bar and navigation/system bar) with user interaction.
     *
     * @see SystemUiHider
     */
    public class FullscreenActivity extends Activity {
     
     private EditText etNum1;
     private EditText etNum2;
     private TextView tvResult;
     private Button btEqualTo;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_fullscreen);
            //获取界面对象
         etNum1=(EditText)findViewById(R.id.editNum1);
         etNum2=(EditText)findViewById(R.id.editNum2);
         tvResult=(TextView)findViewById(R.id.txtResult);
            btEqualTo=(Button)findViewById(R.id.btEqualTo);
           
            //添加 click
            btEqualTo.setOnClickListener(btEqualTo_Click());
        }
       
        //等于事件
        private View.OnClickListener btEqualTo_Click()
        {
      return new View.OnClickListener() {
       @Override
       public void onClick(View arg0) {
        
        double num1= Double.parseDouble(etNum1.getText().toString());
        double num2= Double.parseDouble(etNum2.getText().toString());
        double result=num1+num2;
        
        String value = String.valueOf(result);
        tvResult.setText(value);
       }
      };
        }
       
    }

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  • 原文地址:https://www.cnblogs.com/TeamEngine/p/3567207.html
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