title: How to show toast according to user input?
body: <p>I'm new to Android Development. I'm making an app in which if the user enters a positive value less than 10, a toast should appear Red in color. If he has entered a positive value greater than 10, a toast should appear green in color. I've written the following code with no compilation errors but my app crashes at run time. Please help me out with this. Thank u :)</p>
  
  <pre><code>public class SecondScreen extends ActionBarActivity {
  Button sub;
  EditText mEdit1;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.secondscreen);
  
      sub = (Button) findViewById(R.id.sub);
  
      mEdit1 = (EditText) findViewById(R.id.editText1);
     String a= mEdit1.getText().toString();
  
    final int Me= Integer.parseInt(a);
          sub.setOnClickListener(new View.OnClickListener() {
              @Override
              public void onClick(View v) {
  
                  //setting minimum distance to be 10cm
  
                  if (Me &gt; 10 &amp;&amp; Me &gt;= 0) {
                      LayoutInflater inflater = getLayoutInflater();
  
                      View layout = inflater.inflate(R.layout.toast, (ViewGroup) findViewById(R.id.toast_layout_id));
  
                      // set a message
                      TextView text = (TextView) layout.findViewById(R.id.text);
                      text.setText("Perfect!!");
  
                      // Toast configuration
                      Toast toast = new Toast(getApplicationContext());
                      toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
                      toast.setDuration(Toast.LENGTH_LONG);
                      toast.setView(layout);
                      toast.getView().setBackgroundColor(Color.GREEN);
                      toast.show();
                  } else {
  
                      LayoutInflater inflater = getLayoutInflater();
  
                      View layout = inflater.inflate(R.layout.toast, (ViewGroup) findViewById(R.id.toast_layout_id));
  
                      // set a message
                      TextView text = (TextView) layout.findViewById(R.id.text);
                      text.setText("Stop!! Stop!!");
  
                      // Toast configuration
                      Toast toast = new Toast(getApplicationContext());
                      toast.setGravity(Gravity.CENTER_VERTICAL, 0, 0);
                      toast.setDuration(Toast.LENGTH_LONG);
                      toast.setView(layout);
                      toast.getView().setBackgroundColor(Color.RED);
                      toast.show();
                      //}
  
                  }
              }
          });
              }
              }
  
  
  11-22 22:31:55.214      732-732/com.cpa.hooriya.cpa3 E/AndroidRuntime﹕ FATAL EXCEPTION: main
  java.lang.RuntimeException: Unable to start activity ComponentInfo{com.cpa.hooriya.cpa3/com.cpa.hooriya.cpa3.SecondScreen}: java.lang.NumberFormatException: Invalid int: ""
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
          at android.app.ActivityThread.access$600(ActivityThread.java:141)
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
          at android.os.Handler.dispatchMessage(Handler.java:99)
          at android.os.Looper.loop(Looper.java:137)
          at android.app.ActivityThread.main(ActivityThread.java:5041)
          at java.lang.reflect.Method.invokeNative(Native Method)
          at java.lang.reflect.Method.invoke(Method.java:511)
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
          at dalvik.system.NativeStart.main(Native Method)
   Caused by: java.lang.NumberFormatException: Invalid int: ""
          at java.lang.Integer.invalidInt(Integer.java:138)
          at java.lang.Integer.parseInt(Integer.java:359)
          at java.lang.Integer.parseInt(Integer.java:332)
          at com.cpa.hooriya.cpa3.SecondScreen.onCreate(SecondScreen.java:57)
          at android.app.Activity.performCreate(Activity.java:5104)
          at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
          at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
          at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
          at android.app.ActivityThread.access$600(ActivityThread.java:141)
          at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
          at android.os.Handler.dispatchMessage(Handler.java:99)
          at android.os.Looper.loop(Looper.java:137)
          at android.app.ActivityThread.main(ActivityThread.java:5041)
          at java.lang.reflect.Method.invokeNative(Native Method)
          at java.lang.reflect.Method.invoke(Method.java:511)
          at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
          at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
          at dalvik.system.NativeStart.main(Native Method)
  </code></pre>