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组件说明:
Text
的子类,用来进行用户输入数据的常见属性:
<TextField
ohos:id="$+id:text"
ohos:height="50vp"
ohos:width="319vp"
ohos:background_element="#FFFFFF"
ohos:hint="请输入信息"
ohos:layout_alignment="horizontal_center"
ohos:text_alignment="center"
ohos:text_color="#999999"
ohos:text_size="17fp"
ohos:top_margin="100vp"/>
通过TextField
获取文本输入框中的内容并进行Toast
提示
新建项目:TextFieldApplication
ability_main
<?xml version="1.0" encoding="utf-8"?> <DirectionalLayout xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:height="match_parent" ohos:width="match_parent" ohos:background_element="#F2F2F2" ohos:orientation="vertical"> <TextField ohos:id="$+id:text" ohos:height="50vp" ohos:width="319vp" ohos:background_element="#FFFFFF" ohos:hint="请输入信息" ohos:layout_alignment="horizontal_center" ohos:text_alignment="center" ohos:text_color="#999999" ohos:text_size="17fp" ohos:top_margin="100vp"/> <Button ohos:id="$+id:but" ohos:height="47vp" ohos:width="319vp" ohos:background_element="#21a8FD" ohos:layout_alignment="center" ohos:text="获取信息" ohos:text_alignment="center" ohos:text_color="#FEFEFE" ohos:text_size="24vp" ohos:top_margin="77vp"/> </DirectionalLayout>
onClick
方法中用到 TextField
和 Button
这两个组件,所以要把这两个组件移到成员位置,使其成为成员变量后,onClick
方法才能访问的到MainAbilitySlice
package com.xdr630.textfieldapplication.slice; import com.xdr630.textfieldapplication.ResourceTable; import ohos.aafwk.ability.AbilitySlice; import ohos.aafwk.content.Intent; import ohos.agp.components.Button; import ohos.agp.components.Component; import ohos.agp.components.TextField; import ohos.agp.utils.LayoutAlignment; import ohos.agp.window.dialog.ToastDialog; public class MainAbilitySlice extends AbilitySlice implements Component.ClickedListener { TextField tf; Button but; @Override public void onStart(Intent intent) { super.onStart(intent); super.setUIContent(ResourceTable.Layout_ability_main); //1.找到文本组件框对象 tf = (TextField) findComponentById(ResourceTable.Id_text); //找到按钮组件对象 but = (Button) findComponentById(ResourceTable.Id_but); //2.给按钮绑定点击事件 //当点击了按钮之后,就要获取文本输入框的内容 but.setClickedListener(this); } @Override public void onActive() { super.onActive(); } @Override public void onForeground(Intent intent) { super.onForeground(intent); } @Override public void onClick(Component component) { //当点击了按钮之后,获取文本输入框的内容 String message = tf.getText(); //利用一个Toast将信息弹出 ToastDialog td = new ToastDialog(this); //大小不用设置,默认是包裹内容的 //自动关闭不用设置,默认到了时间之后就自动关闭 //默认持续时间是 2秒 //设置Toast的背景 td.setTransparent(true); //位置(默认居中) td.setAlignment(LayoutAlignment.BOTTOM); //设置一个偏移 td.setOffset(0,200); //设置Toast内容 td.setText(message); //让Toast出现 td.show(); } }
ohos:text_input_type="pattern_password"
:表示输入的密码以密文的方式显示<?xml version="1.0" encoding="utf-8"?> <DirectionalLayout xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:height="match_parent" ohos:width="match_parent" ohos:orientation="vertical" ohos:background_element="#F2F2F2"> <TextField ohos:height="50vp" ohos:width="319vp" ohos:hint="请输入信息" ohos:text_size="17fp" ohos:hint_color="#999999" ohos:text_alignment="center" ohos:top_margin="100vp" ohos:layout_alignment="horizontal_center" ohos:background_element="#FFFFFF" ohos:text_input_type="pattern_password"/> </DirectionalLayout>
有的时候文本输入框并不是一个框,而是下面有一条横线,这条线华为官方叫做 基线
把文本输入框使用横线表示,在上面加上一条基线,把输入框的背景颜色去掉
<TextField
ohos:height="50vp"
ohos:width="319vp"
ohos:hint="请输入信息"
ohos:text_size="17fp"
ohos:hint_color="#999999"
ohos:text_alignment="center"
ohos:top_margin="100vp"
ohos:layout_alignment="horizontal_center"
ohos:text_input_type="pattern_password"
ohos:basement="#000000"
/>
TextField
文本输入框组件,只不过是背景色没有设置,让它跟布局的颜色一致了,看不到背景而已 <TextField
ohos:height="50vp"
ohos:width="319vp"
ohos:hint="请输入信息"
ohos:text_size="17fp"
ohos:hint_color="#999999"
ohos:text_alignment="center"
ohos:top_margin="100vp"
ohos:layout_alignment="horizontal_center"
ohos:basement="#000000"
/>
media
文件夹下 <TextField
ohos:height="50vp"
ohos:width="319vp"
ohos:hint="请输入信息"
ohos:text_size="17fp"
ohos:hint_color="#999999"
ohos:text_alignment="center"
ohos:top_margin="100vp"
ohos:layout_alignment="horizontal_center"
ohos:basement="#000000"
ohos:element_selection_left_bubble="$media:left"
ohos:element_selection_right_bubble="$media:right"
ohos:element_cursor_bubble="$media:bubble"
ohos:selection_color="#FF0000"
/>
ohos:element_selection_left_bubble
、ohos:element_selection_right_bubble
分别设置左右气泡显示的图片ohos:element_cursor_bubble
:设置没有选中时的气泡图片ohos:selection_color
:设置选中时内容的颜色在一些APP中,登录界面密码输入框那里有个小眼睛,按住小眼睛后就可以看到密码的明文展示,松开小眼睛又恢复到密文状态了
需求分析:
新建项目:TextFieldApplication3
ability_main
<?xml version="1.0" encoding="utf-8"?> <DirectionalLayout xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:height="match_parent" ohos:width="match_parent" ohos:orientation="vertical" ohos:background_element="#F2F2F2" > <TextField ohos:id="$+id:text" ohos:height="50vp" ohos:width="319vp" ohos:hint="请输入密码" ohos:text_size="17fp" ohos:hint_color="#999999" ohos:text_alignment="center" ohos:top_margin="100vp" ohos:layout_alignment="horizontal_center" ohos:background_element="#FFFFFF" ohos:text_input_type="pattern_password"/> <Button ohos:id="$+id:but" ohos:height="47vp" ohos:width="319vp" ohos:text="查看密码" ohos:text_size="24vp" ohos:text_color="#FEFEFE" ohos:text_alignment="center" ohos:background_element="#21a8FD" ohos:top_margin="77vp" ohos:layout_alignment="center"/> </DirectionalLayout>
MainAbilitySlice
package com.xdr630.textfieldapplication3.slice; import com.xdr630.textfieldapplication3.ResourceTable; import ohos.aafwk.ability.AbilitySlice; import ohos.aafwk.content.Intent; import ohos.agp.components.Button; import ohos.agp.components.Component; import ohos.agp.components.InputAttribute; import ohos.agp.components.TextField; import ohos.multimodalinput.event.TouchEvent; public class MainAbilitySlice extends AbilitySlice implements Component.TouchEventListener { TextField tf; @Override public void onStart(Intent intent) { super.onStart(intent); super.setUIContent(ResourceTable.Layout_ability_main); //1.找到两个组件对象 tf = (TextField) findComponentById(ResourceTable.Id_text); Button but = (Button) findComponentById(ResourceTable.Id_but); //2.要给按钮绑定一个触摸事件 //因为在触摸事件中,才能获取到按下不松或松开 //单击事件——只能捕获到点击了一下 but.setTouchEventListener(this); } @Override public void onActive() { super.onActive(); } @Override public void onForeground(Intent intent) { super.onForeground(intent); } @Override //参数一:现在触摸的按钮 //参数二:动作对象 public boolean onTouchEvent(Component component, TouchEvent touchEvent) { int action = touchEvent.getAction(); if (action == TouchEvent.PRIMARY_POINT_DOWN){//表示按下不松的时候 //当按下不送的时候,将文本框中密码变成明文 tf.setTextInputType(InputAttribute.PATTERN_NULL); }else if (action == TouchEvent.PRIMARY_POINT_UP){//表示松开的时候 //当松开的时候,将文本框中的密码变回密文 tf.setTextInputType(InputAttribute.PATTERN_PASSWORD); } //true:表示触摸事件的后续动作还会进行触发 //false:表示触摸事件只触发第一个按下不松 return true; } }
TextFieldApplication4
细节说明:
ohos:layout_alignment="right"
就是右边放置了,同时也给个ohos:right_margin="20vp"
和右边的屏幕有些距离。如果ohos:layout_alignment="right"
属性不写,直接写ohos:right_margin="20vp
,那么ohos:layout_alignment="right"
属性就会失效,因为组件默认是放在左边的。ability_main
<?xml version="1.0" encoding="utf-8"?> <DirectionalLayout xmlns:ohos="http://schemas.huawei.com/res/ohos" ohos:height="match_parent" ohos:width="match_parent" ohos:orientation="vertical" ohos:background_element="#F2F2F2"> <TextField ohos:id="$+id:username" ohos:height="50vp" ohos:width="319vp" ohos:hint="请输入用户名" ohos:text_size="17fp" ohos:hint_color="#999999" ohos:text_alignment="center" ohos:top_margin="100vp" ohos:layout_alignment="horizontal_center" ohos:background_element="#FFFFFF"/> <TextField ohos:id="$+id:password" ohos:height="50vp" ohos:width="319vp" ohos:hint="请输入密码" ohos:text_size="17fp" ohos:hint_color="#999999" ohos:text_alignment="center" ohos:top_margin="10vp" ohos:layout_alignment="horizontal_center" ohos:background_element="#FFFFFF" ohos:text_input_type="pattern_password"/> <Text ohos:height="match_content" ohos:width="match_content" ohos:text="忘记密码了?" ohos:text_size="17fp" ohos:text_color="#979797" ohos:top_margin="13vp" ohos:layout_alignment="right" ohos:right_margin="20vp"/> <Button ohos:height="47vp" ohos:width="319vp" ohos:text="登录" ohos:text_size="24fp" ohos:text_color="#FEFEFE" ohos:text_alignment="center" ohos:background_element="#21a8FD" ohos:top_margin="77vp" ohos:layout_alignment="horizontal_center"/> <Button ohos:height="47vp" ohos:width="319vp" ohos:text="注册" ohos:text_size="24fp" ohos:text_color="#FEFEFE" ohos:text_alignment="center" ohos:background_element="#21a8FD" ohos:top_margin="13vp" ohos:layout_alignment="horizontal_center"/> </DirectionalLayout>
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