我有 2 個活動。一是AlertDialogActivity& 二是MainActivity。我AlertDialogActivity在MainActivity.像這樣public class MainActivity extends AlertDialogActivity現在如何覆蓋AlertDialogActivity我的方法MainActivity？警報對話活動：package com.jimmytrivedi.alertdialog;import android.app.AlertDialog;import android.app.Dialog;import android.content.Context;import android.os.Bundle;import android.widget.EditText;import android.widget.TextView;import androidx.appcompat.app.AppCompatActivity;public class AlertDialogActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_alert_dialog); showAlertDialog(AlertDialogActivity.this); } private void showAlertDialog(final Context context) { // 1. Instantiate an <code><a href="/reference/android/app/AlertDialog.Builder.html">AlertDialog.Builder</a></code> with its constructor AlertDialog.Builder builder = new AlertDialog.Builder(AlertDialogActivity.this);// 2. Chain together various setter methods to set the dialog characteristics builder.setMessage("How are you?") .setTitle("Hello");// 3. Get the <code><a href="/reference/android/app/AlertDialog.html">AlertDialog</a></code> from <code><a href="/reference/android/app/AlertDialog.Builder.html#create()">create()</a></code> AlertDialog dialog = builder.create(); dialog.show(); }}
3 回答
莫回無
TA貢獻1865條經驗 獲得超7個贊
如果您希望其他類能夠調用它，請將其showAlertDialog protected改為，甚至公開。private
protected void showAlertDialog(final Context context) {
}
私有方法不能被覆蓋。
慕工程0101907
TA貢獻1887條經驗 獲得超5個贊
如果你想覆蓋一個方法使用 抽象 關鍵字
public abstract class AlertDialogActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_alert_dialog);
showAlertDialog(AlertDialogActivity.this);
}
public abstract void showAlertDialog(final Context context) {
// 1. Instantiate an <code><a href="/reference/android/app/AlertDialog.Builder.html">AlertDialog.Builder</a></code> with its constructor
AlertDialog.Builder builder = new AlertDialog.Builder(AlertDialogActivity.this);
// 2. Chain together various setter methods to set the dialog characteristics
builder.setMessage("How are you?")
.setTitle("Hello");
// 3. Get the <code><a
href="/reference/android/app/AlertDialog.html">AlertDialog</a></code> from <code><a
href="/reference/android/app/AlertDialog.Builder.html#create()">create()</a></code>
AlertDialog dialog = builder.create();
dialog.show();
}
添加回答
舉報
0/150
提交
取消