[英]Add event OnClickListener in dynamically Linear layout in android
如何在每個布局上設置點擊事件在 LinearLayout 中:
我想顯示一個包含 5 個元素的列表,如下所示(不要使用 RecycleView、ListView):
但是捕獲每個項目的點擊事件時出現問題,以及如何知道我點擊了哪個項目,請幫助我。
這是我的代碼:
activity_main.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"
tools:context=".MainActivity">
<LinearLayout
android:id="@+id/layoutRoot"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
</LinearLayout>
</LinearLayout>
item_content.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="10dp"
>
<ImageView
android:layout_width="150dp"
android:layout_height="150dp"
android:src="@drawable/ic_launcher_background"
/>
<TextView
android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="12dp"
android:textSize="18sp"
android:text="string name"
/>
</LinearLayout>
和 Java 代碼:
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addView();
}
public void addView() {
ViewGroup viewGroup = findViewById(R.id.layoutRoot);
for (int i = 0; i <= 5; i++) {
LayoutInflater inflater = (LayoutInflater) getApplicationContext().
getSystemService(getApplicationContext().LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.item_content, null);
TextView textView = view.findViewById(R.id.text);
textView.setText("Name " + i);
viewGroup.addView(view);
}
// viewGroup.setOnClickListener(this);
}
@Override
public void onClick(View view) {
}
}
對於循環中的每個view
( item_content.xml
) 您可以使用 position 添加tag
。 然后在onClick
中,您可以獲得該標簽並解析為Integer
。
例子:
public class MainActivity extends AppCompatActivity
{
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addView();
}
public void addView()
{
ViewGroup viewGroup = findViewById(R.id.layoutRoot);
for (int i = 0; i <= 5; i++)
{
LayoutInflater inflater = (LayoutInflater) getApplicationContext().
getSystemService(getApplicationContext().LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.item_content, null);
view.setTag(Integer.toString(i));
TextView textView = view.findViewById(R.id.text);
textView.setText("Name " + i);
viewGroup.addView(view);
view.setOnClickListener(clickInLinearLayout()); //setting click to each item_content
}
}
private View.OnClickListener clickInLinearLayout()
{
return new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Integer position = Integer.parseInt(v.getTag().toString());
System.out.println("Clicked item at position: " + position);
}
};
}
}
或者變量不是 function 的第二個類似選項:
public class MainActivity extends AppCompatActivity
{
private View.OnClickListener clickInLinearLayout;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
clickInLinearLayout = new View.OnClickListener()
{
@Override
public void onClick(View v)
{
Integer position = Integer.parseInt(v.getTag().toString());
System.out.println("Clicked item at position: " + position);
}
};
addView();
}
public void addView()
{
ViewGroup viewGroup = findViewById(R.id.layoutRoot);
for (int i = 0; i <= 5; i++)
{
LayoutInflater inflater = (LayoutInflater) getApplicationContext().
getSystemService(getApplicationContext().LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.item_content, null);
view.setTag(Integer.toString(i));
TextView textView = view.findViewById(R.id.text);
textView.setText("Name " + i);
viewGroup.addView(view);
view.setOnClickListener(clickInLinearLayout); //setting click to each item_content
}
}
}
將標簽添加到視圖( setTag()
)可以是像 id 之類的數字(例如:1,2,3,... 甚至是您在 for 循環中使用的i
),然后當您單擊檢查標簽( getTag()
),例如:
@Override
public void onClick(View view) {
switch(view.getTag()){
case 1:
....
}
或者只使用 if else 語句
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