Android为按钮Button添加事件

匿名内部类

<!--匿名内部类方式-->
    <Button
        android:id="@+id/btn2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        android:text="匿名内部类方式"
        />

public class MainActivity extends AppCompatActivity implements RadioGroup.OnCheckedChangeListener {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_btn);
        final Button btn2;
        final EditText ed01=findViewById(R.id.ed01);
        final EditText ed02=findViewById(R.id.ed02);
        btn2 = findViewById(R.id.btn2);
        btn2.setOnClickListener(new View.OnClickListener() {
                                    public void onClick(View v) {
                                        Log.i("MainActivity", "匿名内部类按钮被点击");
                                        Log.i("ed01", ed01.getText().toString());
                                        Log.i("ed02", ed02.getText().toString());
  Toast.makeText(MainActivity.this,"这是显示的内容",Toast.LENGTH_SHORT).show();
                                    }
                                });