[英]New Activity Goes to Blank Screen
我是Android Studio的新手,开始新活动时遇到困难。 我已经三遍检查了我的代码,但无法弄清楚我的问题是什么。 我也用谷歌搜索了几个小时,但似乎没有人遇到与我相同的问题。 Logcat没有报告问题,但是当我运行该应用程序并单击该按钮时,该应用程序将进入空白屏幕。 请帮忙!
public class OriginalFragment extends Fragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_original, container, false);
return rootView;
}
}
public class MainFragment extends Fragment {
private AlertDialog mDialog;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
//Sets up the about button
View aboutButton = rootView.findViewById(R.id.about_button);
aboutButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle(R.string.about_title);
builder.setMessage(R.string.about_text);
builder.setCancelable(false);
builder.setPositiveButton(R.string.ok_label,
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
}
});
mDialog=builder.show();
}
});
View originalButton = rootView.findViewById(R.id.original_button);
originalButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(), OriginalActivity.class);
getActivity().startActivity(intent);
}
});
View pictureButton = rootView.findViewById(R.id.picture_button);
originalButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view){
Intent intent = new Intent(getActivity(), PictureActivity.class);
getActivity().startActivity(intent);
}
});
return rootView;
}
@Override
public void onPause(){
super.onPause();
if (mDialog != null)
mDialog.dismiss();
}
}
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}
<FrameLayout
xmlns:android= "http://schemas.android.com/apk/res/android"
xmlns:tools= "http://schemas.android.com/tools"
android:layout_width= "match_parent"
android:layout_height= "match_parent"
android:clipChildren= "false"
tools:context= "org.example.abstract_art.MainActivity">
<fragment android:id= "@+id/main_fragment"
class= "org.example.abstract_art.MainFragment"
android:layout_width= "wrap_content"
android:layout_height= "wrap_content"
android:layout_gravity= "center"
tools:layout= "@layout/fragment_main" />
</FrameLayout>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/select_shapes_background"
tools:context="org.example.abstract_art.OriginalActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Select Shapes"
android:id="@+id/textView"
android:textSize="@dimen/menu_text_size"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<fragment
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:name="org.example.abstract_art.OriginalFragment"
android:id="@+id/fragment"
android:layout_below="@+id/textView"
android:layout_centerHorizontal="true"
tools:layout="@layout/fragment_original" />
</RelativeLayout>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/menu_background"
android:elevation="@dimen/elevation_high"
android:orientation="vertical"
android:padding="@dimen/menu_padding"
tools:context=".org.example.abstract_art.MainFragment">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="@dimen/menu_space"
android:text="@string/long_app_name"
android:textAppearance="?android:textAppearanceLarge"
android:textSize="@dimen/menu_text_size"/>
<Button
android:id="@+id/original_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="@dimen/menu_button_margin"
android:padding="@dimen/menu_button_padding"
android:text="@string/original_label"/>
<Button
android:id="@+id/picture_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="@dimen/menu_button_margin"
android:padding="@dimen/menu_button_padding"
android:text="@string/picture_label"/>
<Button
android:id="@+id/about_button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="@dimen/menu_button_margin"
android:padding="@dimen/menu_button_padding"
android:text="@string/about_label"/>
</LinearLayout>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/menu_background"
android:orientation="vertical"
android:padding="@dimen/menu_padding"
tools:context="org.example.abstract_art.OriginalFragment">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Circles"
android:id="@+id/circlesText"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textSize="@dimen/menu_text_size"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Rectangles"
android:id="@+id/rectanglesText"
android:layout_below="@+id/circlesText"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textSize="@dimen/menu_text_size"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Squares"
android:id="@+id/squaresText"
android:layout_below="@+id/rectanglesText"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textSize="@dimen/menu_text_size"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Triangles"
android:id="@+id/trianglesText"
android:layout_below="@+id/squaresText"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textSize="@dimen/menu_text_size"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="4 Point Stars"
android:id="@+id/fourStarText"
android:layout_below="@+id/trianglesText"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textSize="@dimen/menu_text_size"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="6 Point Stars"
android:id="@+id/sixStarText"
android:layout_below="@+id/fourStarText"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textSize="@dimen/menu_text_size"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Create Art!"
android:id="@+id/createOriginalButton"
android:layout_below="@+id/sixStarText"
android:layout_centerHorizontal="true" />
</RelativeLayout>
请确保下面的事情
尝试下面的代码
按钮originalBtn; //定义班级
originalBtn=(Button)rootView.findViewById(R.id.original_button);
现在您可以设置单击监听器并在其中进行编码
您定义了两次originalButton Click Listener的第二个主要内容,所以我认为这就是您遇到问题的原因
我认为第二个监听器应该是pictureButton单击监听器
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.