Q:

KeyCode_Enter to next edittext

In edittext, after typing 'Enter' key, system make a new line inside it. I'd like to focus on next edittext, no new line. how to code? my code in xml is below
    <EditText
    android:id="@+id/txtNPCode"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:textSize="18sp"
    android:layout_alignLeft="@+id/lblNPCode"
    android:layout_below="@+id/lblNPCode"
    android:layout_centerHorizontal="true"/>
<EditText
    android:id="@+id/txtCNPCode"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:textSize="18sp"
    android:layout_alignLeft="@+id/lblCNPCode"
    android:layout_below="@+id/lblCNPCode"
    android:layout_centerHorizontal="true"/>  

I also caputer key code in setOnKeyListener
   tCNPCode.setOnKeyListener(new OnKeyListener() {
        public boolean onKey(View v, int keyCode, KeyEvent event) {
            // TODO Auto-generated method stub
            if(keyCode == 66) {
                Toast.makeText(S_PCode.this, "Enter Key", Toast.LENGTH_LONG).show();
                //tNPCode.setFocusable(true);
            }
            return false;
        }
    });

A:

You don't even have to use OnKeyListener. Simply add line android:singleLine="true" to your EditText. After this operation EditText behaves exactly like you want. So, in your particular case:
<EditText
    android:id="@+id/txtNPCode"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:textSize="18sp"
    android:layout_alignLeft="@+id/lblNPCode"
    android:layout_below="@+id/lblNPCode"
    android:layout_centerHorizontal="true"
    android:singleLine="true"
/>
<EditText
    android:id="@+id/txtCNPCode"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:textSize="18sp"
    android:layout_alignLeft="@+id/lblCNPCode"
    android:layout_below="@+id/lblCNPCode"
    android:layout_centerHorizontal="true"
/>

solves the problem.

A:

You have to use the requestFocus method. In your case it will be something like:
tCNPCode.setOnKeyListener(new OnKeyListener() {
    public boolean onKey(View v, int keyCode, KeyEvent event) {
        if(keyCode == 66) {
            txtCNPCode.requestFocus();
        }
        return false;
    }
});

A:

The best way is to use one of the options for inputType, for example: android:inputType="textPersonName"
This will achieve the wanted effect. Check out the other options too, it'll save you some time in future :)
You shouldn't use android:singleLine="true", since it's deprecated. Here's what the documentations says about it:

This attribute is deprecated and is replaced by the textMultiLine 
   flag in the inputType attribute. Use caution when altering existing 
   layouts, as the default value of singeLine is false (multi-line 
   mode), but if you specify any value for inputType, the default is 
   single-line mode. (If both singleLine and inputType attributes are 
   found, the inputType flags will override the value of singleLine.).  

