android自定义组件

自定义一个switch按钮

1.layout 新建switches.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"
    android:layout_width="wrap_content"
    android:layout_height="40dp"
     >
        <ImageView
            android:layout_width="140dp"
            android:layout_height="match_parent"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:background="@drawable/bg_switches"
            />
        <Button
            android:id="@+id/switches_thumb"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toTopOf="parent"
            android:background="@drawable/bg_switches_thumb"
            android:layout_width="70dp"
            android:text="否"
            android:textSize="25sp"
            android:layout_height="match_parent"
             />
</androidx.constraintlayout.widget.ConstraintLayout>

2.Switches类

public class Switches extends ConstraintLayout {
    private boolean checked = false;
    private Button button;
    public Switches(Context context, AttributeSet attrs) {
        super(context, attrs);
        LayoutInflater.from(context).inflate(R.layout.switches,this);
        button = findViewById(R.id.switches_thumb);
        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View view) {
                setChecked(!checked);
            }
        });
    }

    public boolean getChecked(){
        return  checked;
    }

    public void setChecked(boolean flag){
        checked = flag;
        LayoutParams layoutParams =(LayoutParams) button.getLayoutParams();
        if(checked){
            layoutParams.setMargins(70,0,0,0);
            button.setText("是");
        } else{
            layoutParams.setMargins(0,0,0,0);
            button.setText("否");
        }
        button.setLayoutParams(layoutParams);
    }
}

3.引用Switches, 与Button使用方式一样,直接在xml文件中使用

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical">
        <Button
            android:layout_width="200dp"
            android:layout_height="50dp" />
        <com.company.project.MyView.Switches
            android:layout_width="200dp"
            android:layout_height="50dp"/>
</LinearLayout>