以上代码是对文件activity_main.xml的修改

Widget组件

包括对按钮、文本框、编辑框、多选控件、单项选择控件、自动完成文本控件、日期选择控件、时间选择控件的使用

吞我代码是吧

1.文本框
MainActivity.java:
package com.example.phone2;
import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Color;
import android.graphics.Typeface;
import android.widget.TextView;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(BundlesavedInstancestate) {
super.onCreate(savedInstancestate);
setContentView(R.layout.activity_main);
TextView tvMessagel = (TextView)findViewById(R.id.tv_message1);
TextView tvMessage2 = (TextView)findViewById(R.id.tv_message2);
tvMessagel.setTextSize(18.0f);
tvMessagel.setTypeface(null,Typeface.BOLD);
tvMessagel.setTextColor(Color.BLUE);
tvMessage2.setText("\nEditText 是Textview的子类");
tvMessage2.setTextColor(Color.RED);
}
}
activity_main.xml:
<?xml version="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="网址/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="10dp"
android:paddingTop="10dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tv_message1"
android:text="TextView通常用于在Activity上显示文字"
android:textColor="#ff00ff"
android:textStyle="italic"
android:gravity="center_horizontal"/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/tv_message2"
android:textSize="25sp"
android:textStyle="bold|italic"
android:text=""/>
</LinearLayout>

2.编辑框
MainActivity.java:
package com.example.phone2;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
TextView tvOut;
EditText txtInput;
@Override
protected void onCreate(BundlesavedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvOut = (TextView) findViewById(R.id.tv_out);
txtInput = (EditText)findViewById(R.id.text_input);
txtInput.setOnKeyListener(newView.OnKeyListener() {
@Override
public boolean onKey(Viewview, int i, KeyEvent keyEvent) {
tvOut.setText("您输入的密码是："+txtInput.getText().toString());
return false;
}
});
}
}
activity_main.xml:
<?xml version="1.0"encoding="utf-8"?>
<LinearLayout xmlns:android="网址/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="10dp"
android:paddingTop="10dp">
<TextView
android:id="@+id/tv_message"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="请输入密码："
android:textSize="20sp"/>
<EditText
android:id="@+id/text_input"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPassword"
android:hint="请在此处输入密码："
android:textSize="18sp"/>
<TextView
android:id="@+id/tv_out"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20sp"
android:textColor="#000000"/>
</LinearLayout>

4.单选按钮
MainActivity.java:
package com.example.phone2;
import android.os.Bundle;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.RadioButton;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
RadioButton rb1, rb2, rb3;
RadioGroup rg;
TextView tvResult;
@Override
protected void onCreate(BundlesavedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvResult = (TextView)findViewById(R.id.tv_result);
rb1 = (RadioButton) findViewById(R.id.rbt_classical);//通过ID找到CheckBox
rb2 = (RadioButton)findViewById(R.id.rbt_novel);
rb3 = (RadioButton)findViewById(R.id.rbt_essays);
rg = (RadioGroup)findViewById(R.id.favor);
//rg.check(R.id.rbt_essays); //效果相同
rb3.setChecked(true); //设置“散文随笔”为选中状态
tvResult.setText("\n您感兴趣的图书：" + rb3.getText().toString());
rg.setOnCheckedChangeListener(cBoxListener);//对CheckBox进行监听
}
private OnCheckedChangeListenercBoxListener = new OnCheckedChangeListener() {
@Override
public voidonCheckedChanged(RadioGroup group, int checkedId) {
if (R.id.rbt_classical ==checkedId) {
tvResult.setText("\n您感兴趣的图书：" +rb1.getText().toString());
setTitle(String.valueOf(rb1.getText()));
} else if (R.id.rbt_novel ==checkedId) {
tvResult.setText("\n您感兴趣的图书：" + rb2.getText().toString());
setTitle(String.valueOf(rb2.getText()));
} else if (R.id.rbt_essays== checkedId) {
tvResult.setText("\n您感兴趣的图书：" + rb3.getText().toString());
}
}
};
}
activity_main.xml:
<?xml version="1.0"encoding="utf-8"?>
<LinearLayout xmlns:android="网址/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="10dp"
android:paddingTop="10dp"
>
<TextView
android:id="@+id/favourite_label"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:text="请选择一个您感兴趣的图书类别" />
<RadioGroup
android:id="@+id/favor"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<RadioButton
android:id="@+id/rbt_classical"
android:checked="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="古典文学" />
<!--设置android:checked 属性值为"true"，将该选项设置为选中状态-->
<RadioButton
android:id="@+id/rbt_novel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="当代小说" />
<RadioButton
android:id="@+id/rbt_essays"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="散文随笔" />
</RadioGroup>
<TextView
android:id="@+id/tv_result"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#0000ff"
android:textSize="17sp"
android:text="\n您感兴趣的图书：古典文学" />
</LinearLayout>

6.日期选择控件
MainActivity.java:
package com.example.phone2;
import android.app.DatePickerDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.DatePicker;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(BundlesavedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onclick(View v) {
Calendar calendar = Calendar.getInstance();
new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener(){
public voidonDateSet(DatePicker view, int year, int month, int dayOfMonth) {
String text = "你选择了：" + year + "年" + (month + 1) + "月" + dayOfMonth + "日";
Toast.makeText(MainActivity.this,text, Toast.LENGTH_SHORT).show();
}
}
, calendar.get(Calendar.YEAR)
, calendar.get(Calendar.MONTH)
, calendar.get(Calendar.DAY_OF_MONTH)).show();
}
}
activity_main.xml:
<?xml version="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="网址/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="日期选择"
android:onClick="onclick"/>
</LinearLayout>

7.时间选择控件
MainActivity.java:
package com.example.phone2;
import android.app.TimePickerDialog;
import android.os.Bundle;
import android.view.View;
import android.widget.TimePicker;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import java.util.Calendar;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(BundlesavedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onclick(View v){
Calendar calendar=Calendar.getInstance();
new TimePickerDialog( this, newTimePickerDialog.OnTimeSetListener() {
@Override
public voidonTimeSet(TimePicker view, int hourOfDay, int minute) {
String text="你选择了"+hourOfDay+"时"+minute+"分";
Toast.makeText(MainActivity.this, text, Toast.LENGTH_SHORT ).show();
}
}
,calendar.get(Calendar.HOUR_OF_DAY)
,calendar.get(Calendar.MINUTE),true).show();
}
}
activity_main.xml:
<?xml version="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="网址/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="时间选择"
android:onClick="onclick"/>
</LinearLayout>

5.多选按钮
MainActivity.java:
package com.example.phone2;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
CheckBox cbox1, cbox2, cbox3;
TextView tvResult;
String myResults = "";
@Override
protected void onCreate(BundlesavedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
cbox1 = (CheckBox)findViewById(R.id.cbox_classical);//通过ID找到CheckBox
cbox2 = (CheckBox)findViewById(R.id.cbox_novel);
cbox3 = (CheckBox)findViewById(R.id.cbox_essays);
//cbox3.setChecked(true); //设置“散文随笔”为选中状态
cbox1.setOnCheckedChangeListener(cBoxListener);//对CheckBox进行监听
cbox2.setOnCheckedChangeListener(cBoxListener);
cbox3.setOnCheckedChangeListener(cBoxListener);
tvResult = (TextView)findViewById(R.id.tv_result);
}
private OnCheckedChangeListenercBoxListener = new OnCheckedChangeListener() {
@Override
public voidonCheckedChanged(CompoundButton buttonView, boolean isChecked) {
myResults = "\n您感兴趣的图书：";
if (cbox1.isChecked()) { //如果第一个复选框处于选中状态
myResults = myResults +" " +cbox1.getText().toString();
}
if (cbox2.isChecked()) { //如果第二个复选框处于选中状态
myResults = myResults +" " +cbox2.getText().toString();
}
if (cbox3.isChecked()) { //如果第三个复选框处于选中状态
myResults = myResults +" " +cbox3.getText().toString();
}
tvResult.setText(myResults); //将选中的信息显示在TextView对象中
}
};
}
activity_main.xml:
<?xml version="1.0"encoding="utf-8"?>
<LinearLayoutxmlns:android="网址/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="10dp"
android:paddingTop="10dp"
>
<TextView
android:id="@+id/favourite_label"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:text="请勾选您感兴趣的图书类别" />
<CheckBox
android:id="@+id/cbox_classical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:checked="true"
android:textSize="20sp"
android:text="古典文学" />
<!--设置android:checked 属性值为"true"，将该“古典文学”选项设置为选中状态-->
<CheckBox
android:id="@+id/cbox_novel"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:text="当代小说" />
<CheckBox
android:id="@+id/cbox_essays"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="20sp"
android:text="散文随笔" />
<TextView
android:id="@+id/tv_result"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#0000ff"
android:textSize="17sp"
android:text="\n您感兴趣的图书：古典文学" />
</LinearLayout>

3.自动完成文本
/res/values/arrays.xml:
<?xml version="1.0"encoding="utf-8"?>
<resources>
<string-arrayname="autoStrings">
<item>北京大学</item>
<item>北京交通大学</item>
<item>北京天安门</item>
<item>北京理工大学</item>
<item>北方天气</item>
<item>南方航空</item>
<item>南方航空公司</item>
<item>aaa南方航空公司</item>
<item>abb南方航空公司</item>
<item>aabb南方航空公司</item>
<item>aaccc南方航空公司</item>
</string-array>
</resources>
res/layout/list_item.xml:
<?xml version="1.0"encoding="utf-8"?>
<TextViewxmlns:android="*/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
android:textSize="18sp"
android:textColor="#0000ff">
</TextView>
MainActivity.java:
package com.example.phone2;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(BundlesavedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//创建适配器
ArrayAdapter<String>adapter = new ArrayAdapter<String>(this,R.layout.list_item,getResources().getStringArray(R.array.autoStrings));
AutoCompleteTextView textView =(AutoCompleteTextView) findViewById(R.id.autoComplete);
textView.setAdapter(adapter); //为AutoCompleteTextView对象设置适配器
}
}
activity_main.xml:
<?xml version="1.0"encoding="utf-8"?>
<LinearLayout xmlns:android="*/apk/res/android"
xmlns:tools="*/tools"
android:id="@+id/activity_main"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="16dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="16dp"
tools:context="com.example.test_1.MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="自动提示文本输入框示例：" />
<AutoCompleteTextView
android:id="@+id/autoComplete"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>

感觉......不如物理

楼主这个是ecplise写的吗