[Android] AlertDialog 對話窗

示範

XML

xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/b1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="dialog"
        android:text="對話窗"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/t1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toTopOf="@+id/b1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />
android.support.constraint.ConstraintLayout>

JAVA

public class MainActivity extends AppCompatActivity {
TextView t1;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
t1=(TextView)findViewById(R.id.t1);
    }
    public void dialog(View v){
        new AlertDialog.Builder(this)
                .setMessage("對談窗示範")
                .setCancelable(false)
                .setTitle("AlertDialog")
                .setNegativeButton("確定", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {//按下確定按鈕處理的事件
                        t1.setText("按下確定");
                    }
                })
                .setPositiveButton("取消", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {//按下取消按鈕處理的事件
                        t1.setText("按下取消");
                    }
                })
                .show();

    }
}

展示

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