If语句不适用于android编程[重复]

Question

Java代码：包com.example.triangleGame；

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class TriangleGame extends Activity {// implement-have to use all of the
                                        // methods
// set up the variables here

Button Gen;
EditText Input1;
EditText Input2;
EditText Input3;
TextView Output1;
TextView Output2;
TextView Output3;
TextView Display;

Editable a;
Editable b;
Editable c;

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.game);

    Input1 = (EditText) findViewById(R.id.editText1);
    a = Input1.getText();

    Input2 = (EditText) findViewById(R.id.editText2);
    b = Input2.getText();

    Input3 = (EditText) findViewById(R.id.editText3);
    c = Input3.getText();

    Display = (TextView) findViewById(R.id.textView5);

    // display edit text

    Gen = (Button) findViewById(R.id.button1);

    Gen.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub

            if ((a == b && b != c) || (a == c && b != c)
                    || (b == c && a != c)) {
                Display.setText("Isosceles Triangle: 2 Congruent Sides");
            } else if (a == b && a == c && b == c) {
                Display.setText("Equilateral Triangle:All sides are equal");
            }

            else if (a != b && a != c && b != c) {
                Display.setText("Scalene Triangle: No Congruent Sides");
            } else {
                Display.setText("Error");
            }

        }
    });

 }

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
}

}

xml代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:text="@string/enter_text" />

<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:text="@string/side_1" />

<EditText
    android:id="@+id/editText1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:hint="@string/type_hint"
    android:inputType="number" >

    <requestFocus />
</EditText>

<TextView
    android:id="@+id/textView3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/side_2" />

<EditText
    android:id="@+id/editText2"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:hint="@string/type_hint"
    android:inputType="number" />

<TextView
    android:id="@+id/textView4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:hint="@string/type_hint"
    android:text="@string/side_3" />

<EditText
    android:id="@+id/editText3"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:hint="@string/type_hint"
    android:inputType="number" />

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/generate" />

<TextView
    android:id="@+id/textView5"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

</LinearLayout>

Answer 1

点击“生成按钮”，它继续显示“斜角三角形：没有全等边”

因为您要在之前获取所有EditText值，所以请单击“Generate Button”的。

要修复问题，请从单击按钮调用edittext.gettext()