设置edittext的hint位置

<EditText 
    android:id="@+id/edt_content"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:hint="@string/suggestion_input"
    android:gravity="top|left"
    android:singleLine="false"
    android:padding="4dp"
    android:clickable="true"
    android:background="@drawable/bg_suggest_input" />