
项目:OrIEntation
package com.example.orIEntation;import androID.os.Bundle;import androID.util.Log;import androID.vIEw.VIEw;import androID.Widget.button;import androID.Widget.TextVIEw;import androIDx.appcompat.app.AppCompatActivity;public class MainActivity extends AppCompatActivity {/* = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = 本实例主要学习,屏幕翻转时,界面如何自适应,创建横屏布局 1.禁止切换横屏:在 AndroIDManifest.xml-->application->activity->中设置如下代码(androID:screenorIEntation="portrait") <activity androID:name=".MainActivity" androID:screenorIEntation="portrait" > 2. 创建 Landscape 布局,横屏时,会自动加载 Landscape 的布局界面(清单文件中,注意去掉 androID:screenorIEntation="portrait" ) 3. 翻转屏幕时,保存窗口控件的状态值; = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = */ button button; TextVIEw textVIEw; String TAG = "mytag"; @OverrIDe protected voID onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentVIEw(R.layout.activity_main); button = findVIEwByID(R.ID.button ); textVIEw = findVIEwByID(R.ID.textVIEw); //如果State中的值不为空,如果有相应的这个组件的值,则读取出来赋值上去 if(savedInstanceState !=null) { String s = savedInstanceState.getString("key"); textVIEw.setText(s); } button.setonClickListener(new VIEw.OnClickListener() { @OverrIDe public voID onClick(VIEw vIEw) { textVIEw.setText(button.getText()); } }); } @OverrIDe protected voID onDestroy() { super.onDestroy(); Log.d(TAG,"onDestroy:"); } @OverrIDe //将 textVIEw 中的值,先保存到 outState 中(键值对) public voID onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putString("key",textVIEw.getText().toString()); }}扩展学习:
UI界面设计
TextVIEw
<TextVIEw androID:ID="@+ID/textvIEw" androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" androID:gravity="center" androID:text="This is a TextVIEw" androID:textcolor="#00ff00" androID:textSize="24sp" />
要想使得文字居中,需要添加属性androID:gravity="center",可选择的选项还有top、bottom、left、right、center等,center相当于center_vertical|center_horizontal。
使用androID:textSize="24sp"指定文字大小,androID:textcolor="#00ff00"指定文字颜色。
button
<button androID:ID="@+ID/button" androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" androID:text="button" androID:textAllCaps="false"/>
在AndroID中,button上面的文字默认英文全部大写,可以通过设置androID:textAllCaps="false"改变
EditText
<EditText androID:ID="@+ID/edittext" androID:layout_wIDth="match_parent" androID:layout_height="wrap_content" androID:hint="HelloWorld" androID:maxLength="20" androID:maxlines="1" />
通过设置hint属性可以得到提示文字,设置maxlines使得输入框中最大输入行数。
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