今天來學Button

Buootn onClick使用方法 設置監聽器來監聽按鈕的觸控
還有三種可以接到click的方式

public class ButtonClickActivity extends AppCompatActivity implements View.OnClickListener{

    private TextView tv_result;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_button_click);
        Button btn_single = findViewById(R.id.btn_single);
        tv_result = findViewById(R.id.tv_result);
        btn_single.setOnClickListener(new MyOnClickListener(tv_result));

        Button btn_public = findViewById(R.id.btn_public);
        btn_public.setOnClickListener(this);
    }

    @Override
    public void onClick(View v){
        if(v.getId()==R.id.btn_public){
            String desc = String.format("%s 你點了按鈕: %s", DateUtil.getnowTime(),((Button)v).getText());
            tv_result.setText(desc);
        }
    }

    static class MyOnClickListener implements View.OnClickListener{
        private final TextView tv_result;

        public MyOnClickListener(TextView tv_result){
            this.tv_result = tv_result;
        }
        @Override
        public void onClick(View v){
            String desc = String.format("%s 你點了按鈕: %s", DateUtil.getnowTime(),((Button)v).getText());
            tv_result.setText(desc);
        }
    }
}

LongClick的使用方式 小於500ms=>onclick 大於500ms=>longclick

public class ButtonLongClickActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_button_long_click);
        TextView tv_result = findViewById(R.id.tv_result);
        Button btn_longclick = findViewById(R.id.btn_longclick);
        btn_longclick.setOnLongClickListener(view -> {
            String desc = String.format("%s 你點了按鈕: %s", DateUtil.getnowTime(),((Button)view).getText());
            tv_result.setText(desc);
            return true;
        });
    }
}

按鈕的Enable和Disable

public class ButtonEnableActivity extends AppCompatActivity implements View.OnClickListener {

    private Button button_result;
    private TextView tv_result;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        EdgeToEdge.enable(this);
        setContentView(R.layout.activity_button_enable);
        Button button_enable = findViewById(R.id.btn_enable);
        Button button_disable = findViewById(R.id.btn_disable);
        button_result = findViewById(R.id.btn_result);
        tv_result = findViewById(R.id.tv_result);

        button_enable.setOnClickListener(this);
        button_disable.setOnClickListener(this);
        button_result.setOnClickListener(this);
    }
    @Override
    public void onClick(View view){
        if(view.getId() == R.id.btn_enable){
            button_result.setEnabled(true);
            button_result.setTextColor(Color.BLACK);
        } else if (view.getId() == R.id.btn_disable) {
            button_result.setEnabled(false);
            button_result.setTextColor(Color.GRAY);
        } else if (view.getId() == R.id.btn_result) {
            String desc = String.format("%s 你點了按鈕: %s", DateUtil.getnowTime(),((Button)view).getText());
            tv_result.setText(desc);
        }
    }
}

今天的button比較多java語法的部分
涉及到比較多public protected
還有有關靜態跟動態變數的差別
理解上比較困難一些些
但有chatgpt的幫助
還是完成嚕 :)