[英]Cant display the item of my List View
我有一個為我的學校制作FAB和浮動標簽的項目。
問題是,列表視圖上的項目沒有顯示出來,我對此很難解決。
我有兩個java類。 MainActivity.java和MyCustomAdapter.java
這是MainActivity.java的代碼
package com.example.sugara.floatingaction_mario;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.preference.DialogPreference;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private ListView myList;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myList = (ListView) findViewById(R.id.list);
myList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(MainActivity.this, "Row " + position + " clicked", Toast.LENGTH_SHORT).show();
}
});
FloatingActionButton FAB = (FloatingActionButton) findViewById(R.id.fab);
FAB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showInputDialog();
}
});
final ArrayList list = new ArrayList<>();
list.add("Richard Felmon age 23");
list.add("Nestor Mersy age 44");
list.add("Bruto Char age 12");
list.add("Filemon Mandela age 33");
list.add("Sukyuu Nirasu age 39");
// final MainActivity adapter = new MyCustomAdapter(MainActivity.this, list);
// myList.setAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
protected void showInputDialog() {
LayoutInflater layoutInflater = LayoutInflater.from(MainActivity.this);
View promptView = layoutInflater.inflate(R.layout.activity_second, null);
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);
alertDialogBuilder.setView(promptView);
alertDialogBuilder.setCancelable(false).setPositiveButton("Save", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
Toast.makeText(getApplicationContext(), "Data saved ", Toast.LENGTH_LONG).show();
}
}).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = alertDialogBuilder.create();
alert.show();
}
}
這是我的MyCustomAdapter.java
package com.example.sugara.floatingaction_mario;
import android.content.Context;
import android.os.Bundle;
import android.support.design.widget.TextInputLayout;
import android.support.v7.app.AppCompatActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.TextView;
import java.util.ArrayList;
public class MyCustomAdapter extends AppCompatActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
//Displaying TextInputLayout Error
TextInputLayout lNameLayout = (TextInputLayout) findViewById(R.id.lNameLayout);
lNameLayout.setErrorEnabled(true);
lNameLayout.setError("Min 2 chars required");
//Displaying EditText Error
EditText age = (EditText) findViewById(R.id.age);
age.setError("Required");
}
}
我嘗試過為列表視圖制作適配器,但是當我這樣做時,它與
public class MyCustomAdapter extends AppCompatActivity {
您能幫我解決這個問題,並使輸入也顯示在列表視圖中嗎?
對不起,這是我的困惑,這是我第一次發布這樣的問題
您的適配器必須擴展Android的Adapter類。 嘗試
public class MyCustomAdapter extends BaseAdapter {
然后實施必要的方法。
如果只希望ListView中的文本,則可能無法自定義適配器類。 請使用這個。 這將為您提供幫助。
使用TextView(layout_list.xml)創建布局
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dp"
android:textSize="20sp" >
</TextView>
像這樣修改MainActivity.java。
...
final ArrayList list = new ArrayList<>();
list.add("Richard Felmon age 23");
list.add("Nestor Mersy age 44");
list.add("Bruto Char age 12");
list.add("Filemon Mandela age 33");
list.add("Sukyuu Nirasu age 39");
myList.setAdapter(new ArrayAdapter<String>(this, R.layout.layout_list, list));
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