Question

问题1）由于某种原因，当我点击“生成”时，它不会显示任何文本。我希望按钮执行以下操作：在用户输入3个值（int）之后，例如：1,1,2和单击“生成”按钮，显示消息应为“Isosceles Triangle：2 Congruent Sides”---这之前有效但我的逻辑错误，我在这里问了一个问题：If statement not working for android programming。然后我尝试实施建议，现在它有一个不同的错误

问题2）我的逻辑是否正确？修复此问题后，我能否显示正确的结果？

请帮助，我是android编程的新手。非常感谢提前。

java代码：

package com.example.trianglegame;

import android.app.Activity;
import android.os.Bundle;
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;
String input1;
String input2;
String input3;

TextView Display;

int a;
int b;
int c;

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

    // assigning the values
    Input1 = (EditText) findViewById(R.id.editText1);
    Input2 = (EditText) findViewById(R.id.editText2);
    Input3 = (EditText) findViewById(R.id.editText3);

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

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

    Gen.setOnClickListener(new View.OnClickListener() {

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

            // getting the text and converting it to string value
            input1 = Input1.getText().toString();
            input2 = Input2.getText().toString();
            input3 = Input2.getText().toString();

            // converting those text values back into int
            a = Integer.parseInt(input1);
            b = Integer.parseInt(input2);
            c = Integer.parseInt(input3);

            // displaying the message

            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) {
                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");
            }

        }
    });
}
}

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" />

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

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

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/clear" />
</LinearLayout>

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

</LinearLayout>

LogCat错误

09-21 18:50:20.739: E/Zygote(32): setreuid() failed. errno: 2
09-21 18:50:24.939: E/Zygote(32): setreuid() failed. errno: 17
09-21 18:50:25.579: E/BatteryService(58): usbOnlinePath not found
09-21 18:50:25.579: E/BatteryService(58): batteryVoltagePath not found
09-21 18:50:25.579: E/BatteryService(58): batteryTemperaturePath not found
09-21 18:50:25.589: E/SurfaceFlinger(58): Couldn't open /sys/power/wait_for_fb_sleep or  /sys/power/wait_for_fb_wake
09-21 18:50:28.279: E/EventHub(58): could not get driver version for /dev/input/mouse0, Not a typewriter
09-21 18:50:28.279: E/EventHub(58): could not get driver version for /dev/input/mice, Not a typewriter
09-21 18:50:28.379: E/System(58): Failure starting core service
09-21 18:50:28.379: E/System(58): java.lang.SecurityException
09-21 18:50:28.379: E/System(58):   at android.os.BinderProxy.transact(Native Method)
09-21 18:50:28.379: E/System(58):   at android.os.ServiceManagerProxy.addService(ServiceManagerNative.java:146)
09-21 18:50:28.379: E/System(58):   at android.os.ServiceManager.addService(ServiceManager.java:72)
09-21 18:50:28.379: E/System(58):   at com.android.server.ServerThread.run(SystemServer.java:184)
09-21 18:50:28.749: E/SoundPool(58): error loading /system/media/audio/ui/Effect_Tick.ogg
09-21 18:50:28.749: E/SoundPool(58): error loading /system/media/audio/ui/KeypressStandard.ogg
09-21 18:50:28.749: E/SoundPool(58): error loading /system/media/audio/ui/KeypressSpacebar.ogg
09-21 18:50:28.749: E/SoundPool(58): error loading /system/media/audio/ui/KeypressDelete.ogg
09-21 18:50:28.749: E/SoundPool(58): error loading /system/media/audio/ui/KeypressReturn.ogg
09-21 18:50:29.359: E/ThrottleService(58): Could not open GPS configuration file /etc/gps.conf
09-21 18:50:29.819: E/logwrapper(133): executing /system/bin/tc failed: No such file or directory
09-21 18:50:29.889: E/logwrapper(135): executing /system/bin/tc failed: No such file or directory
09-21 18:50:29.889: E/logwrapper(136): executing /system/bin/tc failed: No such file or directory
09-21 18:50:32.957: E/HierarchicalStateMachine(58): TetherMaster - unhandledMessage: msg.what=3

Answer 1

而不是：

input2 = Input2.getText().toString();
input3 = Input2.getText().toString();

使用：

input2 = Input2.getText().toString();
input3 = Input3.getText().toString();

Answer 2

据我所知，逻辑很好，虽然我会以不同的方式检查，更具可读性。

int n = 0; //number of equal sides

if(a==b)
  n++;
if(a==c)
  n++;
if(b==c)
  n++;

//Display seems like a class, but is a variable, should start with lower case and have camel notation such as displayTextView
switch(n) {
  case 0:
    Display.setText("Scalen");
    break;
  case 1:
    Display.setText("Isosceles");
    break;
  case 2: case 3:
    Display.setText("Equilateral");
    break;
}

就它显示的错误而言，你可以发布日志吗？

1.不显示文本的按钮2.逻辑正确

2 个答案: