[英]How to add onClick event for individual cardview elements NOT in recyclerview in android?
我正在开发一个具有卡片视图列表的应用程序,我希望每个卡片视图在点击时打开某个活动。 我没有使用任何 recyclerviews 或适配器,我刚刚创建了多个 cardview xml 文件,并将它们包含在 coordinatorlayout 和 collapsingtoolbarlayout 中的主 xml 中。 我试图为单个卡片视图创建 onClick 事件,但应用程序不断崩溃。 以下是我的 main.xml 代码:
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="250dp"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.CollapsingToolbarLayout
android:id="@+id/collapsing_toolbar"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:contentScrim="?attr/colorPrimary"
app:layout_scrollFlags="scroll|exitUntilCollapsed">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="centerCrop"
android:fitsSystemWindows="true"
android:background="@drawable/pic3"
android:id="@+id/profile_id"
app:layout_collapseMode="parallax" />
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin" />
</android.support.design.widget.CollapsingToolbarLayout>
</android.support.design.widget.AppBarLayout>
<android.support.v4.widget.NestedScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFFF"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingTop="10dp">
<include layout="@layout/card_layout1" />
<include layout="@layout/card_layout6"/>
<include layout="@layout/card_layout4"/>
<include layout="@layout/card_layout5"/>
</LinearLayout>
</android.support.v4.widget.NestedScrollView>
我的卡片视图 xml 之一:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/thumbnail"
android:layout_width="match_parent"
android:layout_height="250dp"
android:layout_alignParentTop="true"
android:src="@drawable/categories"
android:layout_marginTop="15dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"/>
<TextView
android:id="@+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/thumbnail"
android:maxLines="3"
android:padding="8dp"
android:text="Categories"
android:textColor="@color/white"
android:textSize="22dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/title"
android:maxLines="3"
android:padding="8dp"
android:text="Embedded systems is ba jksdhkah jksadh bdkbadkwuhs hfoh dn ajbd arh fbkjasd akuhwkjd nsajkbf a dsadjna hwd nlksn ahrja snasfb kjasba sna"
android:textColor="@color/white"
android:textSize="14dp" />
</RelativeLayout>
还有我的 MainActivity.java:
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
private CollapsingToolbarLayout collapsingToolbarLayout=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);
collapsingToolbarLayout = (CollapsingToolbarLayout) findViewById(R.id.collapsing_toolbar);
collapsingToolbarLayout.setTitle(getResources().getString(R.string.user_name));
dynamicToolbarColor();
toolbarTextAppearance();
}
private void dynamicToolbarColor() {
Bitmap bitmap = BitmapFactory.decodeResource(getResources(),
R.drawable.elec);
Palette.from(bitmap).generate(new Palette.PaletteAsyncListener() {
@Override
public void onGenerated(Palette palette) {
int mutedColor = palette.getMutedColor(ContextCompat.getColor(MainActivity.this, R.color.colorPrimary));
collapsingToolbarLayout.setContentScrimColor(mutedColor);
}
});
}
private void toolbarTextAppearance(){
collapsingToolbarLayout.setCollapsedTitleTextAppearance(R.style.collapsedbar);
collapsingToolbarLayout.setExpandedTitleTextAppearance(R.style.expandedappbar);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
@Override
public void onClick(View v) {
}
}
如何在不使用 recyclerview 和适配器的情况下为每个 cardview 实现 onClick 事件?
这是一个不好的做法。 但是您可以为所有卡片视图设置标签,在代码中找到它们并设置点击监听器:
在你的 main.xml
...
<LinearLayout
android:id="@+id/cardsContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingTop="10dp">
<include layout="@layout/card_layout1" />
<include layout="@layout/card_layout6"/>
<include layout="@layout/card_layout4"/>
<include layout="@layout/card_layout5"/>
</LinearLayout>
...
所有在你的卡片布局中都必须有标签:
<android.support.v7.widget.CardView
android:tag="clickableCard"
...>
...
</android.support.v7.widget.CardView>
比您需要使用 thos 标签clickableCard 查找所有视图:(来自此处的解决方案: 查找所有带有标签的视图? )
private ArrayList<View> getViewsByTag(ViewGroup root, String tag){
ArrayList<View> views = new ArrayList<View>();
final int childCount = root.getChildCount();
for (int i = 0; i < childCount; i++) {
final View child = root.getChildAt(i);
if (child instanceof ViewGroup) {
views.addAll(getViewsByTag((ViewGroup) child, tag));
}
final Object tagObj = child.getTag();
if (tagObj != null && tagObj.equals(tag)) {
views.add(child);
}
}
return views;
}
在你 MainActivity.java 的最后 onCreate 方法你需要:
ArrayList<View> clickableViews = getViewsByTag(findViewById(R.id.cardsContainer), "clickableCard");
for (int i = 0; i < clickableViews.size(); i++) {
final Integer viewIndex = i;
View cardView = clickableViews.get(i);
cardView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (viewIndex == 0) {
// do work with first card
}
else if (viewIndex == 1) {
// do work with second card
}
...
}
});
}
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