• 第五次作业


    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/main_layout"
       >
    
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="100dp"
            android:text="点击按钮改变背景颜色"
            />
    
        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true"
            android:text="Button" />
    
    </RelativeLayout>
    package cn.itcase.backcolor;
    
    import androidx.appcompat.app.AlertDialog;
    import androidx.appcompat.app.AppCompatActivity;
    
    import android.content.DialogInterface;
    import android.graphics.Color;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.RelativeLayout;
    
    public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private  Button button;
    int textSize=1;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            button=(Button)findViewById(R.id.button);
            button.setOnClickListener(this);
        }
    
        @Override
        public void onClick(View view) {
            AlertDialog dialog;
            AlertDialog.Builder builder = new AlertDialog.Builder(this)
                    .setTitle("设置背景颜色")           //设置标题
                    .setIcon(R.drawable.ic_launcher)
                    .setSingleChoiceItems(new String[]{"红色", "白色", "黑色", "蓝色",
                            "黄色"},textSize,new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            if (which==0){
                                ((RelativeLayout)findViewById(R.id.main_layout)).setBackgroundColor(Color.parseColor("#ff0000"));
                            }
                            else if(which==1){
                                ((RelativeLayout)findViewById(R.id.main_layout)).setBackgroundColor(Color.parseColor("#ffffff"));
                            }
                            else if(which==2){
                                ((RelativeLayout)findViewById(R.id.main_layout)).setBackgroundColor(Color.parseColor("#000000"));
                            }
                            else if(which==3){
                                ((RelativeLayout)findViewById(R.id.main_layout)).setBackgroundColor(Color.parseColor("#0000fb"));
                            }
                            else {
                                ((RelativeLayout)findViewById(R.id.main_layout)).setBackgroundColor(Color.parseColor("#f1ff00"));
                            }
                        }
                    })
                    .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
    //                        ((RelativeLayout)findViewById(R.id.main_layout)).setBackgroundColor(Color.parseColor("#3FE2C5"));
                            dialog.dismiss();
                        }
                    })//添加“确定”按钮
                    .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();
                        }
                    });
            dialog = builder.create();
            dialog.show();
    
        }
    }
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  • 原文地址:https://www.cnblogs.com/rongrui/p/11584681.html
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