Question

我在android中创建了一个应用程序，它有两个用于获取数字的编辑文本和几个用于操作的单选按钮，如减法，加法，乘法和除法，以及一个用于在文本视图中计算结果的按钮，我的问题是当我在编辑文本中只输入一个数字然后单击计算按钮时我的模拟器关闭，该怎么办？

07-24 19:04:40.250: I/Choreographer(1672): Skipped 44 frames!  The application may be doing too much work on its main thread.
07-24 19:04:40.802: I/Choreographer(1672): Skipped 44 frames!  The application may be doing too much work on its main thread.
07-24 19:04:42.522: I/Choreographer(1672): Skipped 45 frames!  The application may be doing too much work on its main thread.
07-24 19:04:43.070: I/Choreographer(1672): Skipped 57 frames!  The application may be doing too much work on its main thread.
07-24 19:04:43.320: D/AndroidRuntime(1672): Shutting down VM
07-24 19:04:43.320: W/dalvikvm(1672): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
07-24 19:04:43.439: E/AndroidRuntime(1672):     FATAL EXCEPTION: main
07-24 19:04:43.439: E/AndroidRuntime(1672):     java.lang.NumberFormatException: Invalid int: ""
07-24 19:04:43.439: E/AndroidRuntime(1672):     at java.lang.Integer.invalidInt(Integer.java:138)
07-24 19:04:43.439: E/AndroidRuntime(1672):     at java.lang.Integer.parseInt(Integer.java:359)
07-24 19:04:43.439: E/AndroidRuntime(1672):     at java.lang.Integer.parseInt(Integer.java:332)
07-24 19:04:43.439: E/AndroidRuntime(1672):     at com.appwacky.calcumachine.MainActivity$1.onClick(MainActivity.java:61)

07-24 19:04:43.439: E/AndroidRuntime(1672):     atAndroid.view.View.performClick(View.java:4204)
07-24 19:04:43.439: E/AndroidRuntime(1672):     atAndroid.view.View$PerformClick.run(View.java:17355)
07-24 19:04:43.439: E/AndroidRuntime(1672):     atAndroid.os.Handler.handleCallback(Handler.java:725)
07-24 19:04:43.439: E/AndroidRuntime(1672):     atAndroid.os.Handler.dispatchMessage(Handler.java:92)
07-24 19:04:43.439: E/AndroidRuntime(1672):     atAndroid.os.Looper.loop(Looper.java:137)
07-24 19:04:43.439: E/AndroidRuntime(1672): Android.app.ActivityThread.main(ActivityThread.java:5041)

07-24 19:04:43.439: E/AndroidRuntime(1672):     at java.lang.reflect.Method.invokeNative(Native Method)

07-24 19:04:43.439: E/AndroidRuntime(1672):     at java.lang.reflect.Method.invoke(Method.java:511)
07-24 19:04:43.439: E/AndroidRuntime(1672):at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)

07-24 19:04:43.439: E/AndroidRuntime(1672): at      com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)

07-24 19:04:43.439: E/AndroidRuntime(1672):     at dalvik.system.NativeStart.main(Native Method)

<！强> _ __ _ __ _ __ _ __ _ __ _ __ _ __ _ __ _ __ _ __ _ __ _ __ _ __ _ __ _ __ _ 的__ _ __ _ _ ！

package com.appwacky.calcumachine;

import org.w3c.dom.Text;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity 
{

    int i,j,res;

    EditText edt1,edt2;
    TextView tv1;
    RadioButton add,sub,mul,div;
    Button b1;



    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        edt1=(EditText)findViewById(R.id.insert1);
        edt2=(EditText)findViewById(R.id.insert2);

        tv1=(TextView)findViewById(R.id.textView1);

        add=(RadioButton)findViewById(R.id.radio0);
        sub=(RadioButton)findViewById(R.id.radio1);
        mul=(RadioButton)findViewById(R.id.radio2);
        div=(RadioButton)findViewById(R.id.radio3);

        b1=(Button)findViewById(R.id.button1);

        edt1.getText().toString();

        edt1.requestFocus();            
        edt2.getText().toString();



        b1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v)

            {

                if(edt1.length()==0 && edt2.length()==0)
                {
                    Toast.makeText(getApplicationContext(), "Please enter some number", Toast.LENGTH_LONG).show();
                }


                 i=Integer.parseInt(edt1.getText().toString());
                   j=Integer.parseInt(edt2.getText().toString());

                if (add.isChecked()) 
                {

                    res=i+j;

                    //Integer.toString(res);

                     tv1.setText(Integer.toString(res));

                     System.out.println(tv1);


                }

                if (sub.isChecked())
                {
                    res=i-j;

                    tv1.setText(Integer.toString(res));
                    System.out.println(tv1);

                }




                if(mul.isChecked())
                {

                    res=i*j;

                    tv1.setText(Integer.toString(res));
                    System.out.println(tv1);

                }

            try{

                if(div.isChecked())
                {
                    tv1.setText("");
                    res=i/j;

                    tv1.setText(Integer.toString(res));
                    System.out.println(tv1);
                }

            }   
            catch(ArithmeticException ae)
            {
                System.out.println("Its an arithmatic error");
                Toast.makeText(getApplicationContext(), "This is against the arithmatic law", Toast.LENGTH_LONG).show();
            }


            }
        });






    }


}

Answer 1

Unfortunately your application has stopped - 信息就像孩子在世界上第一次哭泣一样。你的申请哭了，想看看你。：）

Jocking

请查看它以供EditText使用。

第1步：创建像Edittext ed=(Edittext)findViewById(R.id.editetext1)这样的实例第2步：然后您可以使用ed.getText();

请注意，从onClick();方法使用它，如果您只创建EditText但没有对象的引用，那么您将获得null pointer exception。

显示“遗憾的是您的应用已停止”消息

1 个答案: