按钮打开 Activity 显示片段

Question

我有一个片段需要显示在 activity 上，但是 activity 中的按钮一直显示在 fragment.I 上，需要片段完全覆盖 activity.

activity的xml。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="@color/colorPrimary"
    android:minHeight="?attr/actionBarSize"
    app:navigationIcon="@drawable/ic_close_black_24dp"
    app:popupTheme="@style/Theme.AppCompat.NoActionBar"
    app:titleTextColor="@color/toolbarTextColor" />

<android.support.design.widget.TextInputLayout

    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <EditText
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:inputType="textMultiLine"
        android:lines="3"
        android:maxLines="10"
        android:scrollbars="vertical" />


</android.support.design.widget.TextInputLayout>

</LinearLayout>

片段

    <?xml version="1.0" encoding="utf-8"?>
    <FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/colorPrimary"
        android:minHeight="?attr/actionBarSize"
        app:navigationIcon="@drawable/ic_close_black_24dp"
        app:popupTheme="@style/Theme.AppCompat.NoActionBar"
        app:titleTextColor="@color/toolbarTextColor" />

    <TextView
        android:id="@+id/firstnameTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="@dimen/activity_horizontal_margin"
       />

    <TextView
        android:id="@+id/lastnameTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="@dimen/activity_horizontal_margin"
       />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

        android:text="Chat" />

    <fragment
        android:id="@+id/fragment_chat"
        android:name="user.InitiateChat_Fragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>

private void init() {
    final FragmentManager fragmentManager = getSupportFragmentManager();
    fragment = fragmentManager.findFragmentById(R.id.fragment_chat);
    final FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
    fragmentTransaction.hide(fragment);
    fragmentTransaction.commit();
}

public void showChatForm() {
    showHideFragment(fragment);
}

private void showHideFragment(final Fragment fragment) {

    final FragmentTransaction fragTransaction = getSupportFragmentManager().beginTransaction();
    fragTransaction.setCustomAnimations(R.anim.fragment_slide_from_bottom, R.anim.fragment_slide_to_bottom);

    if (fragment.isHidden()) {
        fragTransaction.show(fragment);
    } else {
        fragTransaction.hide(fragment);
    }
    fragTransaction.commit();
}

在 activity 上调用了初始化代码 create.Fragment 是一个全局变量。

Answer 1

尝试像这样为您的片段添加背景颜色

<?xml version="1.0" encoding="utf-8"?>
    <FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:background="#ffffff" /* Add any color you want */
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

Answer 2

试试这个：

<fragment
    android:id="@+id/fragment_chat"
    android:name="user.InitiateChat_Fragment"
    android:layout_width="match_parent"
    android:background="?android:attr/colorBackground"   //add this
    android:layout_height="match_parent" />

第二种方式

在片段中创建布局并在显示片段时隐藏它的可见性

    <?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/colorPrimary"
        android:minHeight="?attr/actionBarSize"
        app:navigationIcon="@drawable/ic_close_black_24dp"
        app:popupTheme="@style/Theme.AppCompat.NoActionBar"
        app:titleTextColor="@color/toolbarTextColor" />

    <LinearLayout
        android:id="@+id/activity_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/firstnameTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="@dimen/activity_horizontal_margin" />

        <TextView
            android:id="@+id/lastnameTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:padding="@dimen/activity_horizontal_margin" />

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"

            android:text="Chat" />

    </LinearLayout>

    <fragment
        android:id="@+id/fragment_chat"
        android:name="user.InitiateChat_Fragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>

现在在您的代码中：

  private void showHideFragment(final Fragment fragment) {

    final FragmentTransaction fragTransaction = getSupportFragmentManager().beginTransaction();
    fragTransaction.setCustomAnimations(R.anim.fragment_slide_from_bottom, R.anim.fragment_slide_to_bottom);

    if (fragment.isHidden()) {
        fragTransaction.show(fragment); //show fragment
        layout.setVisibility(View.GONE);  //hide Linearlayout
    } else {
        fragTransaction.hide(fragment);
    }
    fragTransaction.commit();
}

哪里LinearLayout layout =(LinearLayout)findViewById(R.id.activity_button);

Answer 3

您的按钮可见，因为在使用 Material 设计主题时它的默认高度为 2dp。您应该为按钮上方的布局提供 2 或更多 dp 的高度。在您的案例中，这将使按钮消失在片段布局后面。

   android:elevation="2dp"

按钮打开 Activity 显示片段

Button On Activity Showing Over Fragment

xml

android

android-layout

android-fragments

android-fragmentactivity