Android控件(View)之TextView, Button, ImageButton, ImageView, CheckBox 简单介绍
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介绍 在 Android 中使用各种控件(View) TextView - 文本显示控件 Button - 按钮控件 ImageButton - 图片按钮控件 ImageView - 图片显示控件 CheckBox - 复选框控件 RadioButton - 单选框控件 AnalogClock - 钟表(带表盘的那种)控件 DigitalClock - 电子表控件 1、TextView 的 Demo textview.xml 代码 < ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> < !-- TextView - 文本显示控件 --> < TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> < /LinearLayout> _TextView.Java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class _TextView extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.textview); // 设置 Activity 的标题 setTitle("TextView"); TextView txt = (TextView) this.findViewById(R.id.textView); // 设置文本显示控件的文本内容,需要换行的话就用“ ” txt.setText("我是 TextView 显示文字用的"); } } 2、Button 的 Demo button.xml 代码 < ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> < TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> < !-- Button - 按钮控件 --> < Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content"> < /Button> < /LinearLayout> _Button.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; public class _Button extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.button); setTitle("Button"); Button btn = (Button) this.findViewById(R.id.button); btn.setText("click me"); // setOnClickListener() - 响应按钮的鼠标单击事件 btn.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { TextView txt = (TextView) _Button.this.findViewById(R.id.textView); txt.setText("按钮被单击了"); } }); } } 3、ImageButton 的 Demo imagebutton.xml 代码 < ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> < TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> < !-- ImageButton - 图片按钮控件 --> < ImageButton android:id="@+id/imageButton" android:layout_width="wrap_content" android:layout_height="wrap_content"> < /ImageButton> < /LinearLayout> _ImageButton.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.ImageButton; import android.widget.TextView; public class _ImageButton extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.imagebutton); setTitle("ImageButton"); ImageButton imgButton = (ImageButton) this.findViewById(R.id.imageButton); // 设置图片按钮的背景 imgButton.setBackgroundResource(R.drawable.icon01); // setOnClickListener() - 响应图片按钮的鼠标单击事件 imgButton.setOnClickListener(new Button.OnClickListener(){ @Override public void onClick(View v) { TextView txt = (TextView) _ImageButton.this.findViewById(R.id.textView); txt.setText("图片按钮被单击了"); } }); } } 4、ImageView 的 Demo imageview.xml 代码 < ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> < !-- ImageView - 图片显示控件 --> < ImageView android:id="@+id/imageView" android:layout_width="wrap_content" android:layout_height="wrap_content">< /ImageView> < /LinearLayout> _ImageView.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.ImageView; public class _ImageView extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.imageview); setTitle("ImageView"); ImageView imgView = (ImageView) this.findViewById(R.id.imageView); // 指定需要显示的图片 imgView.setBackgroundResource(R.drawable.icon01); } } 5、CheckBox 的 Demo checkbox.xml 代码 < ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> < TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> < !-- CheckBox - 复选框控件 --> < CheckBox android:text="CheckBox01" android:id="@+id/chk1" android:layout_width="wrap_content" android:layout_height="wrap_content">< /CheckBox> < CheckBox android:text="CheckBox02" android:id="@+id/chk2" android:layout_width="wrap_content" android:layout_height="wrap_content">< /CheckBox> < CheckBox android:text="CheckBox03" android:id="@+id/chk3" android:layout_width="wrap_content" android:layout_height="wrap_content">< /CheckBox> < /LinearLayout> _CheckBox.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.TextView; public class _CheckBox extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.checkbox); setTitle("CheckBox"); CheckBox chk = (CheckBox) this.findViewById(R.id.chk1); // setOnCheckedChangeListener() - 响应复选框的选中状态改变事件 chk.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { TextView txt = (TextView) _CheckBox.this.findViewById(R.id.textView); txt.setText("CheckBox01 的选中状态:" + String.valueOf(isChecked)); } }); } } 6、RadioButton 的 Demo radiobutton.xml 代码 < ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> < TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView" /> < !-- RadioButton - 单选框控件 RadioGroup - 对其内的单选框控件做分组 checkedButton - 指定组内被选中的单选框的 ID --> < RadioGroup android:id="@+id/radioGroup" android:layout_width="fill_parent" android:layout_height="fill_parent" android:checkedButton="@+id/rad3" android:orientation="horizontal" android:gravity="center_vertical|center_horizontal"> < RadioButton android:text="rad1" android:id="@+id/rad1" android:layout_width="wrap_content" android:layout_height="wrap_content">< /RadioButton> < RadioButton android:text="rad2" android:id="@+id/rad2" android:layout_width="wrap_content" android:layout_height="wrap_content">< /RadioButton> < RadioButton android:text="rad3" android:id="@+id/rad3" android:layout_width="wrap_content" android:layout_height="wrap_content">< /RadioButton> < /RadioGroup> < /LinearLayout> _RadioButton.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; import android.widget.RadioButton; import android.widget.RadioGroup; import android.widget.TextView; public class _RadioButton extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.radiobutton); setTitle("RadioButton"); RadioGroup group = (RadioGroup) this.findViewById(R.id.radioGroup); // setOnCheckedChangeListener() - 响应单选框组内的选中项发生变化时的事件 group.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { TextView txt = (TextView) _RadioButton.this.findViewById(R.id.textView); txt.setText(((RadioButton)findViewById(checkedId)).getText() + " 被选中"); } }); } } 7、AnalogClock 的 Demo analogclock.xml 代码 < ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> < !-- AnalogClock - 钟表(带表盘的那种)控件 --> < AnalogClock android:id="@+id/analogClock" android:layout_width="wrap_content" android:layout_height="wrap_content"> < /AnalogClock> < /LinearLayout> _AnalogClock.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; public class _AnalogClock extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.analogclcok); setTitle("AnalogClock"); } } 8、DigitalClock 的 Demo digitalclock.xml 代码 < ?xml version="1.0" encoding="utf-8"?> < LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> < !-- DigitalClock - 电子表控件 --> < DigitalClock android:id="@+id/digitalClock" android:layout_width="wrap_content" android:layout_height="wrap_content"> < /DigitalClock> < /LinearLayout> _DigitalClock.java 代码 package com.webabcd.view; import android.app.Activity; import android.os.Bundle; public class _DigitalClock extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); this.setContentView(R.layout.digitalclcok); setTitle("DigitalClcok"); } }
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