700字范文 > Android点击事件下拉菜单单选框实例

Android点击事件下拉菜单单选框实例

时间：2019-01-05 06:46:30

Android点击事件、下拉菜单、单选框实例

点击事件

1.ClickActivity.java

import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;import androidx.appcompat.app.AppCompatActivity;public class ClickActivity extends Activity {private Button bt1;private Button bt2;private TextView tv1;@Overridepublic void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);super.setContentView(R.layout.activity_click);bt1=(Button) findViewById(R.id.bt1);bt1.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {tv1=(TextView) findViewById(R.id.test);tv1.setText("这是监听事件");}});}// @Override// public void onClick(View v){// }public void myClick(View v){tv1=(TextView) findViewById(R.id.test);tv1.setText("这是函数点击事件");}}

2.activity_click.xml

效果图：

单选框

1.RadioGroupActivity.java

import android.app.Activity;import android.os.Bundle;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.TextView;public class RadioGroupActivity extends Activity {private RadioGroup sex;private RadioButton man;private RadioButton woman;private RadioButton dog;private TextView text;@Overridepublic void onCreate(Bundle saveInstanceState){super.onCreate(saveInstanceState);super.setContentView(R.layout.activity_radio);sex=(RadioGroup) findViewById(R.id.sex);man=(RadioButton)findViewById(R.id.man);woman=(RadioButton)findViewById(R.id.woman);dog=(RadioButton)findViewById(R.id.dog);sex.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener(){@Overridepublic void onCheckedChanged(RadioGroup group,int checkedId){RadioButton ch=(RadioButton)findViewById(checkedId);text=findViewById(R.id.text);if(ch==man){text.setText("男人");}else if (ch==woman){text.setText("女人");}else{text.setText("狗");}}});}

2.activity_radio

<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"><TextViewandroid:id="@+id/text"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="请选择你的性别"/><RadioGroupandroid:id="@+id/sex"android:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"android:checkedButton="@id/dog"><RadioButtonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/man"android:text="男人"/><RadioButtonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/woman"android:text="女人"/><RadioButtonandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:id="@+id/dog"android:text="狗"/></RadioGroup>

效果图：

下拉菜单

1.SpinnerActivity.java

import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.Spinner;import android.widget.TextView;import java.util.ArrayList;import java.util.List;public class SpinnerActivity extends Activity {private Spinner Scolor;private Spinner Scity;private Spinner Sfruit;private Spinner Sanimal;private TextView demo;List<CharSequence> dataAnimal;private ArrayAdapter<CharSequence> adapterFruit;private ArrayAdapter<CharSequence> adapterAnimal;@Overridepublic void onCreate(Bundle saveInstanceStates){super.onCreate(saveInstanceStates);super.setContentView(R.layout.activity_spinner);this.Scolor=findViewById(R.id.color);this.Scity=findViewById(R.id.city);this.Sfruit=findViewById(R.id.fruit);this.Sanimal=findViewById(R.id.animal);this.demo=findViewById(R.id.demo);this.Scity.setPrompt("选城市");this.Scolor.setPrompt("选颜色");this.Sfruit.setPrompt("选水果");this.Sanimal.setPrompt("选动物");// 设置之后不起作用:prompt属性只有在dialog状态才有用，所以要在xml中，将style设置为Widget.Spinner// prompt属性要用string下资源，不支持字符直接输入，否则会报错误this.adapterFruit=ArrayAdapter.createFromResource(this,R.array.fruit_label,android.R.layout.simple_spinner_item);this.adapterFruit.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);this.Sfruit.setAdapter(adapterFruit);this.dataAnimal=new ArrayList<CharSequence>();this.dataAnimal.add("柴犬");this.dataAnimal.add("猫");this.dataAnimal.add("大象");this.dataAnimal.add("蟒蛇");this.dataAnimal.add("犀牛");this.adapterAnimal=new ArrayAdapter(this,android.R.layout.simple_spinner_item,this.dataAnimal);this.adapterAnimal.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);this.Sanimal.setAdapter(this.adapterAnimal);this.Scity.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){@Overridepublic void onItemSelected(AdapterView<?> adapterView, View view, int i,long l){String info=adapterView.getItemAtPosition(i).toString();//获得i所在的文本demo.setText(info);}@Overridepublic void onNothingSelected(AdapterView<?> parent) {}});this.Scolor.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener(){@Overridepublic void onItemSelected(AdapterView<?> adapterView, View view, int i,long l){String info=adapterView.getItemAtPosition(i).toString();//获得i所在的文本switch (info){case "红色":demo.setTextColor(0xFF0000FF);break;case "黑色":demo.setTextColor(0xFFFFFFFF);break;case "黄色":demo.setTextColor(0xADFFA0FF);break;case "蓝色":demo.setTextColor(0x7B68EEFF);break;case "绿色":demo.setTextColor(0x7CFC00FF);break;}}@Overridepublic void onNothingSelected(AdapterView<?> parent) {}});}}

2.activity_spinner

<?xml version="1.0" encoding="utf-8"?><LinearLayoutxmlns:android="/apk/res/android"android:layout_height="match_parent"android:layout_width="match_parent"android:orientation="vertical"><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/demo"android:text="测试样例"android:gravity="center"android:textSize="80px"/><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="选择你喜欢的城市"/><Spinnerandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/city"android:entries="@array/city_labels" /><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="选择你喜欢的城市颜色"/><Spinnerandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/color"android:entries="@array/color_labels" /><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="选择你喜欢的水果"/><Spinnerandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/fruit"/><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="选择你喜欢的动物"/><Spinnerandroid:layout_width="match_parent"android:layout_height="wrap_content"android:id="@+id/animal"/></LinearLayout>

效果图：