提示框二

1. MainActivity

public class MainActivity extends AppCompatActivity {    private Button mybutton = null;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        this.mybutton = (Button) super.findViewById(R.id.mybutton);        this.mybutton.setOnClickListener(new OnClickListenerImp());    }    private class OnClickListenerImp implements OnClickListener {        @Override        public void onClick(View v) {            MainActivity.this.exitDialog();        }    }    private void exitDialog() {        Dialog dialog =  new AlertDialog.Builder(MainActivity.this)                .setTitle("program back?")                .setMessage("are you sure to exit this program?")                .setPositiveButton("sure",                        new DialogInterface.OnClickListener() {                            @Override                            public void onClick(DialogInterface dialog, int which) {                                MainActivity.this.finish();    //end of program                            }                        }).setNegativeButton("cancel",     //add cancel button                        new DialogInterface.OnClickListener() {                            @Override                            public void onClick(DialogInterface dialog, int which) {                            }                        }).create();   //create Dialog        dialog.show();   //show Dialog    }}

2. activity_main.xml

<EditText    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:id="@+id/mytext"    android:layout_alignParentTop="true"    android:layout_centerHorizontal="true"    android:layout_marginTop="60dp"    android:text="hello" /><Button    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="delete"    android:id="@+id/mybutton"    android:layout_below="@+id/mytext"    android:layout_centerHorizontal="true"    android:layout_marginTop="55dp" />

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