Question

我正在尝试在两个活动之间创建共享元素转换。这似乎可以在两个布局之间找到，每个布局包含一个ImageView。但是，我遇到了使用ListView进行此转换的问题。

问题是当用户点击第一行时，转换将按预期工作。但是，当点击第二行时，转换的原点似乎也是第一行的图像！

我创建了一个带有自定义行布局的简单列表视图：

row_detailed.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:weightSum="1">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Daft Punk"
        android:id="@+id/primary_textview"
        android:layout_gravity="center_horizontal"
        android:layout_weight="0.07"
        android:layout_alignTop="@+id/primary_imageview"
        android:layout_toRightOf="@+id/primary_imageview" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:text="Random Access Memories"
        android:id="@+id/textView4"
        android:layout_gravity="center_horizontal"
        android:layout_weight="0.07"
        android:layout_alignBottom="@+id/primary_imageview"
        android:layout_toRightOf="@+id/primary_imageview" />


    <ImageView
        android:layout_width="84dp"
        android:layout_height="84dp"
        android:id="@+id/primary_imageview"
        android:src="@drawable/ram"
        android:layout_weight="0.07" />

</RelativeLayout>

辅助活动的布局 activity_transition_secondary.xml ：

<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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context="legiocode.com.tapstrprototype.activity.TransitionSecondaryActivity">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/secondary_imageview"
        android:src="@drawable/ram"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentEnd="true" />

</RelativeLayout>

主要活动 TransitionPrimaryActivity.java ：

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_transition_primary);

        ListView listView = (ListView)findViewById(R.id.listView2);
        ArrayAdapter<String> adapter = new ArrayAdapter(this,
                R.layout.row_detailed,
                R.id.primary_textview,
                items);
        listView.setAdapter(adapter);
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                String transitionName = getString(R.string.transition_image) + String.format("_%d", i);

                ImageView imageView = (ImageView)findViewById(R.id.primary_imageview);
                imageView.setTransitionName(transitionName);

                Intent intent = new Intent(TransitionPrimaryActivity.this, TransitionSecondaryActivity.class);
                intent.putExtra(TransitionSecondaryActivity.TRANSITION_NAME, transitionName);

                ActivityOptionsCompat options =
                        ActivityOptionsCompat.makeSceneTransitionAnimation(TransitionPrimaryActivity.this,
                                imageView,   // The view which starts the transition
                                transitionName    // The transitionName of the view we’re transitioning to
                        );
                ActivityCompat.startActivity(TransitionPrimaryActivity.this, intent, options.toBundle());
            }
        });
    }

辅助活动 TransitionSecondaryActivity.java ：

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_transition_secondary);

        String transitionName = getIntent().getStringExtra(TRANSITION_NAME);

        ImageView imageView = (ImageView)findViewById(R.id.secondary_imageview);
        imageView.setTransitionName(transitionName);
    }

我试图动态地实现转换名称，但这似乎没有多大区别。我是否正确设置过渡？

Answer 1

您必须在

中访问实际点击的视图（在本例中为参数视图）

onItemClick(AdapterView<?> adapterView, View view, int i, long l)

使用

ImageView imageView = (ImageView)findViewById(R.id.primary_imageview);

您始终可以访问列表中的第一个元素。

PS：将转换名称放在xml中。使其更容易阅读。

ListView共享元素转换问题

1 个答案: