Android作业05

概述<?xmlversion="1.0"encoding="utf-8"?><androidx.constraintlayout.widget.ConstraintLayoutxmlns:android="http://schemas.android.com/apkes/android"xmlns:app="http://schemas.android.com/apkes-auto"

<?xml version="1.0" enCoding="utf-8"?><androIDx.constraintlayout.Widget.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:ID="@+ID/bg"    androID:layout_wIDth="match_parent"    androID:layout_height="match_parent"    tools:context=".MainActivity"    tools:ignore="InvalIDID">    <button        androID:ID="@+ID/bt"        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:layout_marginEnd="80dp"        androID:layout_marginRight="80dp"        androID:layout_marginBottom="408dp"        androID:background="#cccccc"        androID:onClick="click"        androID:text="  Change the background color  "        androID:textcolor="#ffffff"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintEnd_toEndOf="parent"        tools:ignore="MissingConstraints,OnClick" /></androIDx.constraintlayout.Widget.ConstraintLayout>

package com.example.myapplication1;import androIDx.appcompat.app.AlertDialog;import androIDx.appcompat.app.AppCompatActivity;import androID.annotation.Suppresslint;import androID.content.DialogInterface;import androID.graphics.color;import androID.os.Bundle;import androID.text.style.BackgroundcolorSpan;import androID.vIEw.VIEw;import androID.Widget.relativeLayout;import androID.Widget.TextVIEw;import androID.Widget.Toast;import java.util.List;public class MainActivity extends AppCompatActivity {    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.activity_main);    }    String ba="000000";    public voID click(VIEw vIEw){        AlertDialog dialog;        AlertDialog.Builder builder = new AlertDialog.Builder(this);        builder.setTitle("color");        builder.setIcon(R.drawable.ic_launcher_background);        builder.setSingleChoiceItems(new String[]{"orange", "blue", "pink", "green"}, 0, new DialogInterface.OnClickListener() {            @OverrIDe            public voID onClick(DialogInterface dialog, int which) {                switch(which){                    case 0:                        ba="#ffba8f";                        break;                    case 1:                        ba="#98caec";                        break;                    case 2:                        ba="fca0c9";                        break;                    case 3:                        ba="bbe094";                        break;                }            }        });        builder.setPositivebutton("OK", new DialogInterface.OnClickListener() {            @OverrIDe            public voID onClick(DialogInterface dialog, int which) {                (findVIEwByID(R.ID.bg)).setBackgroundcolor(color.parsecolor(ba));                dialog.dismiss();            }        });        builder.setNegativebutton("cancel", new DialogInterface.OnClickListener() {            @OverrIDe            public voID onClick(DialogInterface dialog, int which) {                dialog.dismiss();            }        });        dialog=builder.create();        dialog.show();    }}

 

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