android单击事件

1.res/layout/**.xml中的按钮添加单击事件

// **.xml


 <Button
        android:id="@+id/btn"
        android:layout_width="172dp"
        android:layout_height="52dp"
        android:layout_marginEnd="8dp"
        android:text="点击"
        android:onClick="test"
        />

// **.java

public void test(View v){
	Toast.makeText(TestActivity.this,"dianjianniu",Toast.LENGTH_LONG).show();
}

2. 动态添加单击事件

// **.xml


 <Button
        android:id="@+id/btn"
        android:layout_width="172dp"
        android:layout_height="52dp"
        android:layout_marginEnd="8dp"
        android:text="点击"
        />

// **.java

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout_test);
        Button btn = findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                view.setX(view.getX()+10);
            }
        });
    }

3. 可复用性单击事件

package com.example.helloapp;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

public class TestActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.layout_test);
        Button btn = findViewById(R.id.btn);
        btn.setOnClickListener(myListener);
    }

    private View.OnClickListener myListener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            v.setX(v.getX()+10);
        }
    };
}