今日所学—Android中简单控件的使用
下面是相关的代码:
activity_layout.xml
<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="212dp" android:layout_marginLeft="212dp" android:layout_marginTop="76dp" android:text="TextView" android:textColor="#ff0000" android:textSize="30sp" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> <EditText android:id="@+id/editText" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="52dp" android:layout_marginLeft="52dp" android:layout_marginTop="296dp" android:ems="10" android:inputType="textPersonName" android:text="用户名" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> <Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="236dp" android:layout_marginLeft="236dp" android:layout_marginBottom="144dp" android:text="点击" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintStart_toStartOf="parent" /> <CheckBox android:id="@+id/checkBox" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="76dp" android:layout_marginLeft="76dp" android:layout_marginTop="34dp" android:checked="true" android:text="CheckBox" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/editText" /> <RadioGroup android:id="@+id/radioGroup" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="79dp" android:layout_marginLeft="79dp" android:layout_marginTop="20dp" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/checkBox"> <RadioButton android:id="@+id/radioButton" android:layout_width="match_parent" android:layout_height="46dp" android:text="RadioButton" /> <RadioButton android:id="@+id/radioButton2" android:layout_width="match_parent" android:layout_height="wrap_content" android:checked="true" android:text="RadioButton" /> </RadioGroup> <ImageView android:id="@+id/imageView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginStart="40dp" android:layout_marginLeft="40dp" android:layout_marginTop="128dp" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" tools:srcCompat="@tools:sample/avatars[0]" /> </androidx.constraintlayout.widget.ConstraintLayout>
MainActivity.java
package com.example.kongjian; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.EditText; import android.widget.ImageView; import android.widget.RadioGroup; import android.widget.TextView; import android.widget.Toast; import static android.icu.text.DisplayContext.LENGTH_SHORT; public class MainActivity extends AppCompatActivity { private ImageView imageView; private TextView textView; private EditText editText; private RadioGroup radioGroup; private CheckBox checkBox; private Button button; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); button=findViewById(R.id.button); imageView=findViewById(R.id.imageView); textView=findViewById(R.id.textView); editText=findViewById(R.id.editText); radioGroup=findViewById(R.id.radioGroup); checkBox=findViewById(R.id.checkBox); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String edit=editText.getText().toString(); textView.setText(edit); imageView.setImageResource(R.drawable.ic_launcher_background); } }); radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { if(checkedId==R.id.radioButton){ Toast.makeText(getApplicationContext(),"1已选择",Toast.LENGTH_SHORT).show(); }else{ Toast.makeText(getApplicationContext(),"2已选择",Toast.LENGTH_SHORT).show(); } } }); checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { if(isChecked){ Toast.makeText(getApplicationContext(),"已选择",Toast.LENGTH_SHORT).show(); }else{ Toast.makeText(getApplicationContext(),"没有选择",Toast.LENGTH_SHORT).show(); } } }); } }
效果截图: