一、ImageView与ImageButton
<ImageView
android:layout_width="300dp"
android:layout_height="200dp"
android:src="@drawable/ic_launcher_background"
android:background="#222222"
android:scaleType="fitCenter"/>
<ImageView
android:layout_width="300dp"
android:layout_height="200dp"
android:src="@drawable/ic_launcher_background"
android:background="#222222"
android:scaleType="center"/>
<ImageView
android:layout_width="300dp"
android:layout_height="200dp"
android:src="@drawable/ic_launcher_background"
android:background="#222222"
android:scaleType="fitXY"/>
在Java代码中更改图片为
imageView.setImageResource(R.drawable.unhappy);
二、CheckBox
public class MainActivity extends AppCompatActivity {
private CheckBox cb_game,cb_travel,cb_read;
private CheckBoxListener checkBoxListener;//3、定义这个监听器
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
setListener();
}
//4、
// 在这个方法中实现监听
private void setListener() {
checkBoxListener = new CheckBoxListener();
cb_game.setOnCheckedChangeListener(checkBoxListener);
cb_travel.setOnCheckedChangeListener(checkBoxListener);
cb_read.setOnCheckedChangeListener(checkBoxListener);
}
//1、为了看着代码干净一点我们用这个初始化一下findviewbyid
private void initView() {
cb_game=findViewById(R.id.cb_game);
cb_travel=findViewById(R.id.cb_travel);
cb_read=findViewById(R.id.cb_read);
}
//2、CheckBoxListener实现OnCheckedChangeListener监听器来监听选择框的改变isChecked当被选中时返回true反之false
class CheckBoxListener implements CompoundButton.OnCheckedChangeListener{//注意使用CompoundButton的OnCheckedChangeListener
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
//当选种状态发生变化时触发
CheckBox checkBox = (CheckBox) buttonView;
switch (checkBox.getId()){
case R.id.cb_game:
Toast.makeText(MainActivity.this,"电竞："+isChecked,Toast.LENGTH_SHORT).show();
break;
case R.id.cb_travel:
Toast.makeText(MainActivity.this,"旅游："+isChecked,Toast.LENGTH_SHORT).show();
break;
case R.id.cb_read:
Toast.makeText(MainActivity.this,"阅读："+isChecked,Toast.LENGTH_SHORT).show();
break;
}
}
}
}
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="0dp"
android:layout_weight="1"
android:layout_height="wrap_content"
android:text="请选择爱好:"/>
<CheckBox
android:id="@+id/cb_game"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="电竞"
android:checked="true"/>
<CheckBox
android:id="@+id/cb_travel"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="旅游"/>
<CheckBox
android:id="@+id/cb_read"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="阅读"/>
</LinearLayout>
</LinearLayout>
三、RadioButton
1、RadioButton是圆形单选框
2、RadioGroup是个了以容纳多个RadioButton的容器
3、在RadioGroup中的RadioButton控件可以有多个，但同时有且仅有一个可以被选中
实现单选按钮
在布局文件中定义RadioGroup
在RadioGroup中添加RadioButton
在Java代码中获取控件对象
为对象添加监听器
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="请选择性别"/>
<RadioGroup
android:id="@+id/rg_sex"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>
<RadioButton
android:id="@+id/rb_Male"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="男"/>
<RadioButton
android:id="@+id/rb_FeMale"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="女"/>
</RadioGroup>
</LinearLayout>
public class MainActivity extends AppCompatActivity {
private RadioGroup rg;
private RadioButton rb_male,rb_female;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rg = findViewById(R.id.rg_sex);
rb_male = findViewById(R.id.rb_Male);
rb_female = findViewById(R.id.rb_FeMale);
rg.setOnCheckedChangeListener(new MyRadioButtonListener());
}
class MyRadioButtonListener implements RadioGroup.OnCheckedChangeListener{
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
//在状态改变时被触发
switch (checkedId){
case R.id.rb_FeMale:
Log.i("sex","当前用户选择"+rb_female.getText().toString());
break;
case R.id.rb_Male:
Log.i("sex","当前用户选择"+rb_male.getText().toString());
break;
}
}
}
}
四、ToggleButton
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="你今天开心么？"/>
<ToggleButton
android:id="@+id/tb"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textOff="不开心"
android:textOn="开心"/>
按钮按下显示为textOff 抬起显示为textOn
public class MainActivity extends AppCompatActivity {
private ToggleButton toggleButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toggleButton = findViewById(R.id.tb);
toggleButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (toggleButton.isChecked()){
Toast.makeText(MainActivity.this,toggleButton.getText().toString(),Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(MainActivity.this,toggleButton.getText().toString(),Toast.LENGTH_SHORT).show();
}
}
});
}
}
