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" />