Question

我想在我的活动setContentView（）布局上设置背景图像，并在我的片段视图下方始终显示相同的图像。我尝试在我的根布局上设置背景图像，并在子布局上将背景设置为透明，但它没有按预期工作。

聚苯乙烯。对于代码/布局转储感到抱歉，我宁愿把所有东西放在这里，然后留下可能导致问题的东西。

Picasso Init in activity onCreate：

        Picasso.Builder b = new Picasso.Builder(getApplicationContext());
        if (BuildConfig.DEBUG) {
            b.loggingEnabled(true);
            b.indicatorsEnabled(true);
        }
        b.memoryCache(new LruCache(getApplicationContext()));
        Picasso.setSingletonInstance(b.build());

数据绑定代码：

private static Target t;
@BindingAdapter("android:backgroundUrl")
    public static void setBackgroundUrl(final ViewGroup view,final String url) {
        if(Strings.isNullOrEmpty(url)){
            return;
        }
        t = new Target() {
            @Override
            public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
                view.setBackground(new BitmapDrawable(view.getResources(),bitmap));
                Log.e("Picasso","onBitmapLoaded: " + from.name());
            }

            @Override
            public void onBitmapFailed(Drawable errorDrawable) {
                Log.e("BindingTools.setBackUrl","Failed to load: " + url);
            }

            @Override
            public void onPrepareLoad(Drawable placeHolderDrawable) {
                //do nothing
            }
        };
        Picasso.with(view.getContext()).load(url).into(t);
    }

活动布局：

<?xml version="1.0" encoding="utf-8"?>
<layout
    xmlns:android="http://schemas.android.com/apk/res/android">
    <data class=".RootBinding">
        <variable name="backgroundUrl" type="String"/>
    </data>
    <FrameLayout
        android:backgroundUrl="@{backgroundUrl}"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:scaleType = "centerCrop">
    <FrameLayout
        android:id="@+id/fragment_container"
        android:layout_height="match_parent"
        android:layout_width="match_parent"
        android:background="@color/Transparent">
    </FrameLayout>

    </FrameLayout>
</layout>

示例片段布局：

<layout
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context=".Fragments.AccountFragment">
    <data class=".AccountBinding">
        <import type="android.view.View" />
        <variable name="user" type="packageName.ViewModels.AccountViewModel"/>
        <variable name="loginBtnEvent" type="View.OnClickListener"/>
        <variable name="usernameError" type="String"/>
        <variable name="passwordError" type="String"/>
        <variable name="backgroundUrl" type="String"/>
    </data>
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:background="@color/Transparent">
        <android.support.v7.widget.CardView
            android:layout_marginTop="16dp"
            android:layout_marginBottom="4dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginEnd="16dp"
            android:layout_marginRight="16dp"
            android:layout_marginStart="16dp"
            android:layout_marginLeft="16dp">
            <android.support.v7.widget.LinearLayoutCompat
                android:orientation="vertical"
                android:layout_width="match_parent"
                android:layout_height="wrap_content">
                <android.support.design.widget.AppBarLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginBottom="16dp"
                    app:elevation="0dp">
                    <android.support.v7.widget.LinearLayoutCompat
                        android:orientation="horizontal"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content">
                        <android.support.v7.widget.Toolbar
                            android:layout_margin="16dp"
                            android:layout_height="wrap_content"
                            android:layout_width="match_parent"
                            app:title="@string/app_name"
                            app:subtitle="@{!user.IsReAuth ? @string/login : @string/login_message_return, default=@string/login}"
                            app:subtitleTextColor="@color/cardview_light_background"
                            app:titleTextColor="@color/cardview_light_background">
                            <com.mikhaellopez.circularimageview.CircularImageView
                                android:layout_gravity="end"
                                android:layout_width="45dp"
                                android:layout_height="45dp"
                                android:layout_margin="2dp"
                                app:civ_border_color="@color/colorPrimaryDark"
                                app:civ_border_width="4dp"
                                android:src="@{user.ImageUrl, default=@drawable/user}"
                                android:tint="@color/cardview_light_background"
                                 />
                        </android.support.v7.widget.Toolbar>
                    </android.support.v7.widget.LinearLayoutCompat>
                    <ProgressBar
                        android:visibility="@{user.IsLoadingAccount ? View.VISIBLE : View.INVISIBLE}"
                        style="?android:attr/progressBarStyleHorizontal"
                        android:layout_marginBottom="-8dp"
                        android:layout_marginTop="-4dp"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:backgroundTint="@color/colorAccent"
                        android:indeterminate="true"
                        android:indeterminateBehavior="cycle"/>
                </android.support.design.widget.AppBarLayout>

                <android.support.design.widget.TextInputLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    app:errorEnabled="true"
                    android:errorText="@{usernameError}"
                    android:paddingEnd="8dp"
                    android:paddingRight="8dp"
                    android:paddingStart="8dp"
                    android:paddingLeft="8dp">
                    <android.support.design.widget.TextInputEditText
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:inputType="textNoSuggestions"
                        android:hint="@string/username"
                        android:text="@={user.UserName}"/>
                </android.support.design.widget.TextInputLayout>

                <android.support.design.widget.TextInputLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    app:errorEnabled="true"
                    android:errorText="@{passwordError}"
                    android:paddingEnd="8dp"
                    android:paddingRight="8dp"
                    android:paddingStart="8dp"
                    android:paddingLeft="8dp">
                    <android.support.design.widget.TextInputEditText
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:inputType="textPassword"
                        android:hint="@string/password"
                        android:text="@={user.Password}"/>
                </android.support.design.widget.TextInputLayout>
                <android.support.v7.widget.ButtonBarLayout
                    android:layout_gravity="right"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content">
                    <android.support.v7.widget.AppCompatButton
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:visibility="@{!user.IsReAuth ? View.GONE : View.VISIBLE}"
                        android:text="@string/removeAccount"
                        style="@style/Base.Widget.AppCompat.Button.Borderless"/>
                    <android.support.v7.widget.AppCompatButton
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="@string/login"
                        android:onClick="@{loginBtnEvent}"
                        style="@style/Base.Widget.AppCompat.Button.Borderless"/>
                </android.support.v7.widget.ButtonBarLayout>

            </android.support.v7.widget.LinearLayoutCompat>
        </android.support.v7.widget.CardView>

    </FrameLayout>

</layout>

设置片段的代码:(编辑：问题是此函数的第一行）

private void setRootFragment(Fragment f, boolean addToStack) {
    rootBinding = (RootBinding) DataBindingUtil.setContentView(this, R.layout.root);
    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
    transaction.replace(R.id.fragment_container, f);
    if(addToStack){
        transaction.addToBackStack(null);
    }else{
        transaction.disallowAddToBackStack();
    }
    transaction.commit();
}

Strings.xml Trasparent值：

<color name="Transparent">#00000000</color>

Answer 1

问题是每次我想切换片段时，我都在重置数据绑定对象并使其视图膨胀。

设置片段的代码：

private void setRootFragment(Fragment f, boolean addToStack) {

    //this line of code needs to be in oncreate and not called every time I switch fragments.
    //rootBinding = (RootBinding) DataBindingUtil.setContentView(this, R.layout.root);
    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
    transaction.replace(R.id.fragment_container, f);
    if(addToStack){
        transaction.addToBackStack(null);
    }else{
        transaction.disallowAddToBackStack();
    }
    transaction.commit();
}

在片段布局

1 个答案: