我对 onClickListener 方法有疑问。当它被称为应用程序崩溃时。我一直在寻找解决方案,但似乎我的代码包含了所有被告知的内容。
public class Sudoku extends Activity implements OnClickListener {
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sudoku);
View continue_button = findViewById(R.id.continue_button);
continue_button.setOnClickListener(this);
View new_button = findViewById(R.id.new_button);
new_button.setOnClickListener(this);
View about_button = findViewById(R.id.about_button);
about_button.setOnClickListener(this);
View exit_button = findViewById(R.id.exit_button);
exit_button.setOnClickListener(this);
}
// ...
public void onClick(View v)
{
switch (v.getId())
{
case R.id.about_button:
Intent i = new Intent(this, About.class);
startActivity(i);
break;
}
}
}
--
public class About extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_about);
}
}
主要活动:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:background="@color/background"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="30dip"
tools:context=".Sudoku" >
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/main_tittle"
android:gravity="center"
android:textColor="@color/main_tittle"
android:textSize="25sp"
android:layout_marginBottom="25dip"/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/continue_label" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/new_game_label" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/about_label" />
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/exit_label" />
</LinearLayout>
</LinearLayout>
我是android / java编程的初学者,请原谅。