Android 共享元素不能为null-共享元素活动转换
我一直在尝试实现这个共享元素转换,并在单击转换时不断出现“java.lang.IllegalArgumentException:共享元素不能为null”错误。请帮忙 这是下面给出的主要活动onCreate方法。请检查我的密码Android 共享元素不能为null-共享元素活动转换,android,android-animation,android-transitions,Android,Android Animation,Android Transitions,我一直在尝试实现这个共享元素转换,并在单击转换时不断出现“java.lang.IllegalArgumentException:共享元素不能为null”错误。请帮忙 这是下面给出的主要活动onCreate方法。请检查我的密码 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
imageView = findViewById(R.id.image);
recList = (RecyclerView)findViewById(R.id.RecView);
recList.setHasFixedSize(true);
recList.addOnItemTouchListener(
new MyOnClickListener(this, new MyOnClickListener.OnItemClickListener() {
@Override public void onItemClick(View view, int position) {
Intent intent = new Intent(MainActivity.this, DetailsActivity.class);
String transitionName = getString(R.string.transitionName);
ActivityOptionsCompat options = ActivityOptionsCompat.
makeSceneTransitionAnimation(MainActivity.this, imageView, transitionName);
startActivity(intent, options.toBundle());
}
})
);
这是recyclerView的onClickListener
public class MyOnClickListener implements RecyclerView.OnItemTouchListener {
private OnItemClickListener mListener;
public interface OnItemClickListener {
void onItemClick(View view, int position);
}
GestureDetector mGestureDetector;
@Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
public MyOnClickListener(Context context, OnItemClickListener listener) {
mListener = listener;
mGestureDetector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
}
@Override
public boolean onInterceptTouchEvent(RecyclerView view, MotionEvent e) {
View childView = view.findChildViewUnder(e.getX(), e.getY());
if (childView != null && mListener != null && mGestureDetector.onTouchEvent(e)) {
mListener.onItemClick(childView, view.getChildAdapterPosition(childView));
}
return false;
}
@Override
public void onTouchEvent(RecyclerView view, MotionEvent motionEvent) {
}
}
图像的转换名称相同。这里的bug修复不是问题所在
我的卡片的xml
<?xml version="1.0" encoding="utf-8"?>
>
目标活动的xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center">
<ImageView
android:id="@+id/image"
android:layout_width="150dp"
android:layout_height="150dp"
android:scaleType="centerCrop"
android:src="@drawable/littlefractal"
android:transitionName="@string/transitionName" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_marginStart="40dp">
<TextView
android:id="@+id/txt_first_name_details"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:gravity="center_vertical"
android:text="FirstName"
android:textColor="@color/colorPrimaryDark"
android:textSize="16sp"
/>
<TextView
android:id="@+id/txt_last_name"
android:layout_width="wrap_content"
android:layout_height="40dp"
android:gravity="center_vertical"
android:text="LastName"
android:textColor="@color/colorPrimaryDark"
android:textSize="16sp"
android:layout_marginStart="10dp"/>
</LinearLayout>
<TextView
android:id="@+id/txt_address"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:padding="10dp"
android:text="Address"
android:textColor="@color/colorPrimary"
android:textSize="16sp"
android:layout_marginStart="30dp"/>
<TextView
android:id="@+id/txt_phone"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:padding="10dp"
android:text="Phone"
android:textColor="@color/colorPrimary"
android:textSize="16sp"
android:layout_marginStart="30dp"/>
</LinearLayout>
放松点。还在学习整个安卓系统。和平与赞赏 发生此异常是因为imageView为空。您需要从RecyclerView项获取imageView。试试这个:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recList = (RecyclerView)findViewById(R.id.RecView);
recList.setHasFixedSize(true);
recList.addOnItemTouchListener(
new MyOnClickListener(this, new MyOnClickListener.OnItemClickListener() {
@Override public void onItemClick(View view, int position) {
Intent intent = new Intent(MainActivity.this, DetailsActivity.class);
String transitionName = getString(R.string.transitionName);
View transitionView = view.findViewById(R.id.image);
ViewCompat.setTransitionName(transitionView, transitionName);
ActivityOptionsCompat options = ActivityOptionsCompat.
makeSceneTransitionAnimation(MainActivity.this, transitionView, transitionName);
startActivity(intent, options.toBundle());
}
})
);
只要正确地检查一下,可能
getString(R.string.transitionName)
为空。通过getResources().getString(R.string.transitionName)
访问它。还要检查xml文件中的ImageView
是否必须设置相同的android:transitionName
值。都一样。调试器告诉我imageView为空。转换名称都很好。它是ImageViews。在LogE中打印转换名称/转换名称是:personDetails。它是红色的,但正确。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recList = (RecyclerView)findViewById(R.id.RecView);
recList.setHasFixedSize(true);
recList.addOnItemTouchListener(
new MyOnClickListener(this, new MyOnClickListener.OnItemClickListener() {
@Override public void onItemClick(View view, int position) {
Intent intent = new Intent(MainActivity.this, DetailsActivity.class);
String transitionName = getString(R.string.transitionName);
View transitionView = view.findViewById(R.id.image);
ViewCompat.setTransitionName(transitionView, transitionName);
ActivityOptionsCompat options = ActivityOptionsCompat.
makeSceneTransitionAnimation(MainActivity.this, transitionView, transitionName);
startActivity(intent, options.toBundle());
}
})
);