Zi 字媒體

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 相關文章: [Android] Android 學習總集