java - 安卓 : Making simple code. 干

Question

我是 Java 编程的新手。这里有人可以帮我让我的代码保持干燥吗？

Button level01 = (Button) findViewById(R.id.level01);
level01.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Prefs.setStagePref(getApplicationContext(), 1);
        Intent play = new Intent(LevelActivity.this, PlayActivity.class);
        startActivity(play);
    }
});

Button level02 = (Button) findViewById(R.id.level02);
level02.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Prefs.setStagePref(getApplicationContext(), 2);
        Intent play = new Intent(LevelActivity.this, PlayActivity.class);
        startActivity(play);
    }
});

Button level03 = (Button) findViewById(R.id.level03);
level03.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Prefs.setStagePref(getApplicationContext(), 3);
        Intent play = new Intent(LevelActivity.this, PlayActivity.class);
        startActivity(play);
    }
});

我想制作超过 20 个按钮，那么如何让这段代码变干。

谢谢

Answer 1

把你的重复功能放在方法中

private void f(int i){
        Prefs.setStagePref(getApplicationContext(), i);
        Intent play = new Intent(LevelActivity.this, PlayActivity.class);
        startActivity(play);
}

然后改变你处理点击的方式

在“onClick”布局中

   <ImageButton
                        android:layout_width="wrap_content"
                        android:layout_height="fill_parent"
                        android:id="@+id/saveButton" android:src="@android:drawable/ic_menu_save"
                        android:layout_weight="1" android:background="@drawable/menu_button" android:onClick="onClick"/>
                <ImageButton
                        android:layout_width="wrap_content"
                        android:layout_height="fill_parent"
                        android:id="@+id/wallpaperButton" android:src="@android:drawable/ic_menu_gallery"
                        android:layout_weight="1" android:background="@drawable/menu_button" android:onClick="onClick"/>
                <ImageButton
                        android:layout_width="wrap_content"
                        android:layout_height="fill_parent"
                        android:id="@+id/shareButton" android:src="@android:drawable/ic_menu_share"
                        android:layout_weight="1" android:background="@drawable/menu_button" android:onClick="onClick"
                        android:focusableInTouchMode="false"/>

Activity 中

public void onClick(View cview) throws IOException {
    switch (cview.getId()) {
        case R.id.saveButton:
            f(1);
            break;

        case R.id.shareButton:
            f(2);
            break;

        case R.id.wallpaperButton:
            f(3);
            break;
}
}

或

MainActivity implements OnClickListener

...

Button level1 = (Button) findViewById(R.id.level1);
level1.setOnClickListener(this);
Button level2 = (Button) findViewById(R.id.level2);
level2.setOnClickListener(this);
Button level3 = (Button) findViewById(R.id.level3);
level3.setOnClickListener(this);
...

public void onClick(View cview) throws IOException {
    switch (cview.getId()) {
        case R.id.level1:
            f(1);
            break;

        case R.id.level2:
            f(2);
            break;

        case R.id.level3:
            f(3);
            break;
}
}