想了解更多内容,实输入请访问:
和华为官方合作共建的文本鸿蒙技术社区
https://harmonyos.51cto.com
组件说明:
是Text的子类,用来进行用户输入数据的框组。常见属性:
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>因为要在 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,实输入使其成为成员变量后,文本onClick 方法才能访问的框组到。
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,本使就要获取文本输入框的实输入内容 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,获取文本输入框的文本内容 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,默认是框组包裹内容的 //自动关闭不用设置,默认到了时间之后就自动关闭 //默认持续时间是本使 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(); } }运行:
当输入密码的时候会变成密文展示。
ohos:text_input_type="pattern_password":表示输入的实输入密码以密文的方式显示。
基本使用:
<?文本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,云服务器而是框组下面有一条横线,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" />如果以后看到一条基线,然后在输入一些数字信息,这还是 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。
当用鼠标长按选中输入的内容后,就会选中内容,前面的光标和后面的光标,以及中间选中的内容颜色会改变,华为官方给前、后的光标,以及没有选中内容状态下出现的小气球取名为气泡。
<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" />可以设置左边、右边,以及没有选中情况下的服务器租用气泡。
气泡的图片、颜色都是可以自定义的。
以下用到的图片可自取:https://www.aliyundrive.com/s/wT22d1Vb1BV
把左、右,以及中间没有选中的气泡图片复制到 media 文件夹下。
运行:
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。
把“小眼睛”改成Button组件,实现的逻辑原理也是一样的。
需求分析:
按住按钮不松,将输入框中的密码变成明文 松开按钮之后,输入框中的密码变回密文新建项目: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 //当按下不送的香港云服务器时候,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; } }运行:
新建项目:TextFieldApplication4
细节说明:
Text文本(忘记密码了?)组件默认是左边放置的,加上 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>运行:
想了解更多内容,请访问:
和华为官方合作共建的鸿蒙技术社区
https://harmonyos.51cto.com