当我在edittext上输入任何内容时，应用程序崩溃

Question

What's missing in code?

I have a problem here. I have here 2 edittext. One for amount and one for password. My app works like a charm except when I entered NONE on the edittexts, IT CRASHES (Unfortunately stop). Am I missing any code on my activity? Please help. Here's my code.

public class MainActivity extends Activity {
    Button REDIRECT;
    private EditText txtbox1,txtbox2;

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

        REDIRECT = (Button) findViewById(R.id.button1);
        txtbox1= (EditText) findViewById(R.id.editText1);  
        txtbox2= (EditText) findViewById(R.id.editText2);

        REDIRECT.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                int Amount = Integer.parseInt(txtbox1.getText().toString());
                String Password = txtbox2.getText().toString();


                if(Amount<=50&&Amount>=1 & Password.equals("TUBOL"))
                {

                final Intent i = new Intent(MainActivity.this, Redirect.class);               
                startActivity(i);
                }
                else 
                {
                    Toast.makeText(MainActivity.this, "INVALID", Toast.LENGTH_LONG).show();
                }
            }
        });

    }

Here is my logcat:

09-15 01:46:34.641: E/AndroidRuntime(30540): FATAL EXCEPTION: main
09-15 01:46:34.641: E/AndroidRuntime(30540): java.lang.NumberFormatException: Invalid int: ""
09-15 01:46:34.641: E/AndroidRuntime(30540):    at java.lang.Integer.invalidInt(Integer.java:138)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at java.lang.Integer.parseInt(Integer.java:359)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at java.lang.Integer.parseInt(Integer.java:332)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at com.example.pwordlockdown.MainActivity$1.onClick(MainActivity.java:29)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at android.view.View.performClick(View.java:3549)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at android.view.View$PerformClick.run(View.java:14400)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at android.os.Handler.handleCallback(Handler.java:605)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at android.os.Handler.dispatchMessage(Handler.java:92)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at android.os.Looper.loop(Looper.java:154)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at android.app.ActivityThread.main(ActivityThread.java:4945)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at java.lang.reflect.Method.invokeNative(Native Method)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at java.lang.reflect.Method.invoke(Method.java:511)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
09-15 01:46:34.641: E/AndroidRuntime(30540):    at dalvik.system.NativeStart.main(Native Method)

Answer 1

It's an uncaught NumberFormatExpection on Integer.parseInt(txtbox1.getText().toString())

txtbox1 is empty when this method is called, so you're calling Integer.parseInt("") which throws a NumberFormatExpection .

Answer 2

You are entering String and trying to parse it to Int

int Amount = 0;

try
{
    Amount = Integer.parseInt(txtbox1.getText().toString());
}
catch(NumberFormatException e)
{
    // Sep 14, 2013 11:26:26 PM
    Log.e("Exception","DownloadFileTask.onPostExecute.NumberFormatException"+String.valueOf(e.getMessage()));
    e.printStackTrace();
}

This throwing error

You must use for number only EditText set property inputType like this

<EditText
    android:id="@+id/editText1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="numberDecimal" >
</EditText>

Answer 3

Check if the input is not null before converting Amount it to int otherwise there will be NumberFormatException

 REDIRECT.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

        String a=txtbox1.getText().toString();
        if(a.equals(" "))
        {

        Toast a1 =Toast.makeText(getApplicationContext(), "Enter the Amount", Toast.LENGTH_LONG);
        a1.show();

        }
        else 
    {

    int Amount = Integer.parseInt(txtbox1.getText().toString());
            String Password = txtbox2.getText().toString();


            if(Amount<=50&&Amount>=1 & Password.equals("TUBOL"))
            {

            final Intent i = new Intent(MainActivity.this, Redirect.class);               
            startActivity(i);
            }
            else 
            {
                Toast.makeText(MainActivity.this, "INVALID", Toast.LENGTH_LONG).show();


    }
    }
    });

Answer 4

The problem is that if nothing is entered into the EditText , then parsing it to an Integer would give you an error (because there are no numbers to parse).

When taking input from your EditText and parsing it to an Integer , simply add an if structure, like so:

if (!(editText.getText().toString().equals(""))) // if edit text is NOT blank
{
    int num = Integer.parseInt(editText.getText().toString());
}

Answer 5

你试图通过尝试解析txtBox1..getText().toString()并尝试将其重新路由到错误吐司来捕获可能出现的错误怎么样？

Answer 6

hey you gotta do an if statement to check if the textBox is empty or not...

public class MainActivity extends Activity {
Button REDIRECT;
private EditText txtbox1,txtbox2;

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

    REDIRECT = (Button) findViewById(R.id.button1);
    txtbox1= (EditText) findViewById(R.id.editText1);  
    txtbox2= (EditText) findViewById(R.id.editText2);

    REDIRECT.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
        if(!txtbox1.getText().toString().equals("")){

            int Amount = Integer.parseInt(txtbox1.getText().toString());
            String Password = txtbox2.getText().toString();


            if(Amount<=50&&Amount>=1 & Password.equals("TUBOL"))
            {

            final Intent i = new Intent(MainActivity.this, Redirect.class);               
            startActivity(i);
            }
            else 
            {
                Toast.makeText(MainActivity.this, "INVALID", Toast.LENGTH_LONG).show();
            }
            }else{
                Toast.makeText(MainActivity.this, "Amount Box empty...", Toast.LENGTH_LONG).show();
            }
        }
    });

}

hope it helps...

Answer 7

I find my solution. I set android:text="0" and my problem is gone. :))