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我有一個ListView和一個按鈕，當我按下按鈕時，它將帶我到一個對話框它有一個文本字段和另一個按鈕，當我填充文本並按下按鈕它將保存在列表視圖中（我知道如何將來自同一活動的項目添加到ListView），但我不知道如何添加來自其他活動或AlterDialoge的項目。從Android AlertDialog添加項目到ListView
public class Main3Activity extends AppCompatActivity {
EditText et;
ListView lv;
Button bt;
ArrayList<String> arrayList;
ArrayAdapter<String> adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
et = (EditText) findViewById(R.id.TextAdd);
bt = (Button) findViewById(R.id.btnadd);
lv = (ListView) findViewById(R.id.listView);
arrayList = new ArrayList<String>();
adapter= new ArrayAdapter<String>(Main3Activity.this,android.R.layout.simple_list_item_1,arrayList);
lv.setAdapter(adapter);
Button mShowDialog = (Button) findViewById(R.id.btnSave);
mShowDialog.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
AlertDialog.Builder mBuilder = new AlertDialog.Builder(Main3Activity.this);
View mView = getLayoutInflater().inflate(R.layout.dialog_add,null);
final EditText mUser = (EditText) mView.findViewById(R.id.TextAdd);
Button mAdd = (Button) mView.findViewById(R.id.btnadd);
mAdd.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(!mUser.getText().toString().isEmpty()) {
String result = et.getText().toString();
arrayList.add(result);
adapter.notifyDataSetChanged();
Toast.makeText(Main3Activity.this, "Success", Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(Main3Activity.this, "Error pls Write", Toast.LENGTH_SHORT).show();
}
}
});
mBuilder.setView(mView);
AlertDialog dialog = mBuilder.create();
dialog.show();
}
});
}
<?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="5dp">
<TextView
android:id="@+id/Add"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textStyle="bold"
android:layout_margin="5dp"
android:textSize="25sp"
android:text="POP UP Window" />
<EditText
android:id="@+id/TextAdd"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:layout_marginTop="10dp"
android:inputType="textPersonName"
android:hint="write"/>
<Button
android:id="@+id/btnadd"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorAccent"
android:textColor="@android:color/white"
android:text="Add" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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="com.example.jim_a.testapp.Main3Activity"
tools:layout_editor_absoluteY="81dp"
tools:layout_editor_absoluteX="0dp">
<Button
android:id="@+id/btnSave"
android:layout_height="73dp"
android:text="Open Window"
android:layout_width="0dp"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="16dp"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
tools:layout_constraintRight_creator="1"
tools:layout_constraintLeft_creator="1" />
<ListView
android:id="@+id/listView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="13dp"
tools:layout_constraintTop_creator="1"
tools:layout_constraintRight_creator="1"
tools:layout_constraintBottom_creator="1"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginEnd="13dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginTop="33dp"
app:layout_constraintTop_toBottomOf="@+id/btnSave"
tools:layout_constraintLeft_creator="1"
android:layout_marginBottom="31dp"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="13dp"
android:layout_marginRight="13dp"></ListView>
</android.support.constraint.ConstraintLayout>