如何在Android中创建ListView内部可聚焦的EditText?
此示例演示了如何在Android中创建ListView内部的可聚焦EditText。
步骤1 - 在Android Studio中创建一个新项目,转到文件 ⇒ 新建项目,并填写所有必需的详细信息以创建新项目。
步骤2 - 将以下代码添加到res/layout/activity_main.xml。
<?xml version="1.0" encoding="utf-8"?> <LinearLayout 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:orientation="vertical" android:padding="4dp" tools:context=".MainActivity"> <ListView android:id="@+id/listView" android:layout_width="fill_parent" android:layout_height="fill_parent" android:descendantFocusability="beforeDescendants"> </ListView> </LinearLayout>
步骤3 - 创建一个新的布局资源文件并添加以下代码-
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <EditText android:id="@+id/ItemCaption" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_marginStart="2dip" android:singleLine="true"> </EditText> </LinearLayout>
步骤4 - 将以下代码添加到src/MainActivity.java
import androidx.appcompat.app.AppCompatActivity; import android.annotation.SuppressLint; import android.app.LauncherActivity; import android.content.Context; import android.os.Bundle; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.EditText; import android.widget.ListView; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { ListView listView; MyAdapter myAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); listView = findViewById(R.id.listView); listView.setItemsCanFocus(true); myAdapter = new MyAdapter(); listView.setAdapter(myAdapter); } private class MyAdapter extends BaseAdapter { private LayoutInflater layoutInflater; ArrayList<LauncherActivity.ListItem> myItems = new ArrayList<>(); MyAdapter() { layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); for (int i = 0; i < 7; i++) { LauncherActivity.ListItem listItem = new LauncherActivity.ListItem(); listItem.className = "Caption" + i; myItems.add(listItem); } notifyDataSetChanged(); } @Override public int getCount() { return myItems.size(); } @Override public Object getItem(int position) { return position; } @Override public long getItemId(int position) { return position; } @SuppressLint("InflateParams") @Override public View getView(int position, View convertView, ViewGroup parent) { ViewHolder holder; if (convertView == null) { holder = new ViewHolder(); convertView = layoutInflater.inflate(R.layout.listitem, null); holder.caption = convertView.findViewById(R.id.ItemCaption); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } holder.caption.setText(myItems.get(position).className); holder.caption.setId(position); holder.caption.setOnFocusChangeListener(new View.OnFocusChangeListener() { public void onFocusChange(View v, boolean hasFocus) { if (!hasFocus) { final int position = v.getId(); final EditText Caption = (EditText) v; myItems.get(position).className = Caption.getText().toString(); } } }); return convertView; } } class ViewHolder { EditText caption; } }
步骤5 - 将以下代码添加到androidManifest.xml
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity" android:windowSoftInputMode="adjustPan"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
让我们尝试运行您的应用程序。我假设您已将您的实际Android移动设备连接到您的计算机。要从Android Studio运行应用程序,请打开项目中的一个活动文件,然后单击工具栏中的运行 图标。选择您的移动设备作为选项,然后检查您的移动设备,它将显示您的默认屏幕
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