Question

我已经在Eclipse中编写了android计算器程序，并且在我完成代码时没有出现错误，但是当模拟器运行时，例如在方程式运算符单击时输入两个数字求和，此错误出现＆＃34;遗憾的是应用程序停止了＃34;

我的Main.java

＆＃13;

package com.Tools.s01_e07;


import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.TextView;



public class Main extends Activity {

	private TextView show;
	private ImageView n1;
	private ImageView n2;
	private ImageView n3;
	private ImageView n4;
	private ImageView n5;
	private ImageView n6;
	private ImageView n7;
	private ImageView n8;
	private ImageView n9;
	private ImageView n0;
	
	private ImageView nf1;
	private ImageView nf2;
	private ImageView nf3;
	private ImageView nf4;
	private ImageView nf5;
	private ImageView nf6;
	
	private int V1;
	private String F;
	private int V2;
	
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        n1=(ImageView) findViewById(R.id.n1);
        n2=(ImageView) findViewById(R.id.n2);
        n3=(ImageView) findViewById(R.id.n3);
        n4=(ImageView) findViewById(R.id.n4);
        n5=(ImageView) findViewById(R.id.n5);
        n6=(ImageView) findViewById(R.id.n6);
        n7=(ImageView) findViewById(R.id.n7);
        n8=(ImageView) findViewById(R.id.n8);
        n9=(ImageView) findViewById(R.id.n9);
        n0=(ImageView) findViewById(R.id.n0);
        
        nf1=(ImageView) findViewById(R.id.nf1);
        nf2=(ImageView) findViewById(R.id.nf2);
        nf3=(ImageView) findViewById(R.id.nf3);
        nf4=(ImageView) findViewById(R.id.nf4);
        nf5=(ImageView) findViewById(R.id.nf5);
        nf6=(ImageView) findViewById(R.id.nf6);
        show=(TextView) findViewById(R.id.show);
        
        n1.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		     
				show.setText(show.getText()+"1");
			}
		});
        
        n2.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
				show.setText(show.getText()+"2");
			}
		});
        
        n3.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
				show.setText(show.getText()+"3");
			}
		});
        
        n4.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
				show.setText(show.getText()+"4");
			}
		});
        
        n5.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
				show.setText(show.getText()+"5");
			}
		});
        
        n6.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
				show.setText(show.getText()+"6");
			}
		});
        
        n7.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
				show.setText(show.getText()+"7");
			}
		});
        
        n8.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
				show.setText(show.getText()+"8");
			}
		});
        
        n9.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
				show.setText(show.getText()+"9");
			}
		});
        
        n0.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
				show.setText(show.getText()+"0");
			}
		});
        
        nf1.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
				V1=Integer.parseInt(show.getText().toString());
				F="+";
				show.setText(" ");
			}
		});
        
        nf2.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
				V1=Integer.parseInt(show.getText().toString());
				F="-";
				show.setText(" ");
				
			}
		});
        
        nf3.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
				V1=Integer.parseInt(show.getText().toString());
				F="*";
				show.setText(" ");
			}
		});
        
        nf4.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
				V1=Integer.parseInt(show.getText().toString());
				F="/";
				show.setText(" ");
			}
		});
        
        nf5.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
				if(F!=""  && show.getText().toString()!="")
		     {
				int res=0;
				V2=Integer.parseInt(show.getText().toString());
				if(F=="+"){
				  
					res=V1+V2;
				}
               if(F=="-"){
					
            	   res=V1-V2;
				}
               if(F=="*"){
					
            	   res=V1*V2;
				}
               if(F=="/"){
            	   
            	   res=V1/V2;
					
				}
			    
               show.setText(res+"");
		      } 
			}
		});
        
        nf6.setOnClickListener(new OnClickListener() {
			public void onClick(View arg0) {
		
			}
		});
        
    }


   
    
}

＆＃13;

main.xml中

＆＃13;

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.Tools.s01_e07.Main" >

    <ImageView
        android:id="@+id/n1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_marginBottom="116dp"
        android:layout_marginLeft="64dp"
        android:src="@drawable/a01" />

    <ImageView
        android:id="@+id/n2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/n1"
        android:layout_toRightOf="@+id/n1"
        android:src="@drawable/a02" />

    <ImageView
        android:id="@+id/n3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/n2"
        android:layout_toRightOf="@+id/n2"
        android:src="@drawable/a03" />

    <ImageView
        android:id="@+id/n4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/n1"
        android:layout_alignLeft="@+id/n1"
        android:src="@drawable/a04" />

    <ImageView
        android:id="@+id/n5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/n1"
        android:layout_toRightOf="@+id/n1"
        android:src="@drawable/a05" />

    <ImageView
        android:id="@+id/n6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/n3"
        android:layout_alignTop="@+id/n5"
        android:src="@drawable/a06" />

    <ImageView
        android:id="@+id/n7"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/n4"
        android:layout_alignLeft="@+id/n4"
        android:src="@drawable/a07" />

    <ImageView
        android:id="@+id/n8"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/n7"
        android:layout_toRightOf="@+id/n7"
        android:src="@drawable/a08" />

    <ImageView
        android:id="@+id/n9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/n6"
        android:layout_alignTop="@+id/n8"
        android:src="@drawable/a09" />

    <ImageView
        android:id="@+id/n0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/n2"
        android:layout_toRightOf="@+id/n1"
        android:src="@drawable/a00" />

    <ImageView
        android:id="@+id/nf5"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/n2"
        android:layout_toRightOf="@+id/n2"
        android:src="@drawable/mosavi" />

    <ImageView
        android:id="@+id/nf1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/n9"
        android:layout_toRightOf="@+id/n9"
        android:src="@drawable/sum" />

    <ImageView
        android:id="@+id/nf2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/nf1"
        android:layout_below="@+id/nf1"
        android:src="@drawable/tafrigh" />

    <ImageView
        android:id="@+id/nf3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/nf2"
        android:layout_toRightOf="@+id/n3"
        android:src="@drawable/zarb" />

    <ImageView
        android:id="@+id/nf4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/nf3"
        android:layout_below="@+id/nf3"
        android:src="@drawable/taghsim" />

    <ImageView
        android:id="@+id/nf6"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/n1"
        android:layout_alignTop="@+id/nf4"
        android:src="@drawable/p2" />

    <TextView
        android:id="@+id/show"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_above="@+id/n7"
        android:layout_alignLeft="@+id/n7"
        android:layout_alignRight="@+id/nf1"
        android:layout_marginBottom="40dp"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:textSize="22sp" />

</RelativeLayout>

＆＃13;

这是我的LogCat

＆＃13;

03-20 14:59:37.211: D/dalvikvm(1225): GC_CONCURRENT freed 69K, 5% free 6286K/6616K, paused 3ms+2ms, total 26ms
03-20 14:59:37.283: D/libEGL(1225): loaded /system/lib/egl/libEGL_genymotion.so
03-20 14:59:37.287: D/(1225): HostConnection::get() New Host Connection established 0xb78f8410, tid 1225
03-20 14:59:37.299: D/libEGL(1225): loaded /system/lib/egl/libGLESv1_CM_genymotion.so
03-20 14:59:37.299: D/libEGL(1225): loaded /system/lib/egl/libGLESv2_genymotion.so
03-20 14:59:37.355: W/EGL_genymotion(1225): eglSurfaceAttrib not implemented
03-20 14:59:37.367: D/OpenGLRenderer(1225): Enabling debug mode 0
03-20 15:00:01.239: D/AndroidRuntime(1225): Shutting down VM
03-20 15:00:01.239: W/dalvikvm(1225): threadid=1: thread exiting with uncaught exception (group=0xa613f908)
03-20 15:00:01.239: E/AndroidRuntime(1225): FATAL EXCEPTION: main
03-20 15:00:01.239: E/AndroidRuntime(1225): java.lang.NumberFormatException: Invalid int: " 2"
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at java.lang.Integer.invalidInt(Integer.java:138)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at java.lang.Integer.parse(Integer.java:375)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at java.lang.Integer.parseInt(Integer.java:366)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at java.lang.Integer.parseInt(Integer.java:332)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at com.Tools.s01_e07.Main$15.onClick(Main.java:173)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at android.view.View.performClick(View.java:4204)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at android.view.View$PerformClick.run(View.java:17355)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at android.os.Handler.handleCallback(Handler.java:725)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at android.os.Handler.dispatchMessage(Handler.java:92)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at android.os.Looper.loop(Looper.java:137)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at android.app.ActivityThread.main(ActivityThread.java:5041)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at java.lang.reflect.Method.invokeNative(Native Method)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at java.lang.reflect.Method.invoke(Method.java:511)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-20 15:00:01.239: E/AndroidRuntime(1225): 	at dalvik.system.NativeStart.main(Native Method)

＆＃13;

Answer 1

按下操作员按钮时，将show TextView设置为“”（空格），然后将第二个操作符的数字附加到其上。你可能在parseInt中得到一个NumberFormatException。您也应该不相信用户正常按下按钮。

程序停止在android Emulator中工作

1 个答案: