Question

您好，我尝试在手机上通过USB运行该应用程序，只是为了确保它可以正常工作，并且出现了此错误。

当我更深入地研究错误时，它提到了有关XML文件底部的centerHorizontal的内容。

尝试了一些无效的解决方案。任何帮助都很好。非常感谢你！

<?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:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="0dp"
android:paddingTop="0dp"
android:paddingLeft="0dp"
android:paddingRight="0dp"
tools:context=".MainActivity">

<include
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    layout="@layout/buttons"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:id="@+id/include"/>
<include
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    layout="@layout/hands"
    android:layout_centerHoriztonal="true"
    android:layout_alignParentTop="true"/>

package com.example.rockpaper;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import java.util.Random;

  public class MainActivity extends AppCompatActivity {
Button b_rock, b_paper, b_scissors;
ImageView iv_cpu, iv_me;
String myChoice, cpuChoice, result;
Random r;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    iv_cpu = (ImageView) findViewById(R.id.iv_cpu);
    iv_me = (ImageView) findViewById(R.id.iv_me);

    b_rock = (Button) findViewById(R.id.b_rock);
    b_paper = (Button) findViewById(R.id.b_paper);
    b_scissors = (Button) findViewById(R.id.b_scissors);

    r = new Random();

    b_rock.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            myChoice = "rock";
            iv_cpu.setImageResource(R.drawable.rock);
            calculate();

        }
    });
    b_paper.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            myChoice = "paper";
            iv_cpu.setImageResource(R.drawable.paper);
            calculate();

        }
    });
    b_scissors.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            myChoice = "scissors";
            iv_cpu.setImageResource(R.drawable.scissors);
            calculate();


        }
    });
}

public void calculate() {
    int cpu = r.nextInt(3);
    if (cpu == 0) {
        cpuChoice = "rock";
        iv_cpu.setImageResource(R.drawable.rock);
    } else if (cpu == 1) {
        cpuChoice = "paper";
        iv_cpu.setImageResource(R.drawable.paper);

    } else if (cpu == 2) {
        cpuChoice = "scissors";
        iv_cpu.setImageResource(R.drawable.scissors);
    }

    if(myChoice.equals("rock") && cpuChoice.equals("paper")){
        result = "you lose";
    } else
    if(myChoice.equals("rock") && cpuChoice.equals("scissors")){
        result = "you win";
    } else
    if(myChoice.equals("rock") && cpuChoice.equals("rock")){
        result = "draw";
    } else
    if(myChoice.equals("paper") && cpuChoice.equals("paper")){
        result = "draw";
    } else
    if(myChoice.equals("paper") && cpuChoice.equals("scissors")){
        result = "you lose";
    } else
    if(myChoice.equals("paper") && cpuChoice.equals("rock")){
        result = "you win";
    } else
    if(myChoice.equals("scissors") && cpuChoice.equals("paper")){
        result = "you win";
    } else
    if(myChoice.equals("scissors") && cpuChoice.equals("scissors")){
        result = "draw";
    } else
    if(myChoice.equals("scissors") && cpuChoice.equals("rock")){
        result = "you lose";
    }
    Toast.makeText(MainActivity.this, result, Toast.LENGTH_SHORT).show();
}
 }

更详细的错误消息

Answer 1

您的根布局为ConstraintLayout，但这些

android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"

属性属于RelativeLayout

解决方案

将根布局更改为RelativeLayout或在ConstraintLayout标签内指定include的相应定位元素

喜欢

app:layout_constraintLeft_toRightOf = "id or parent" 
app:layout_constraintRight_toLeftOf = "id or parent" 
app:layout_constraintTop_toTopOf = "id or parent" 
app:layout_constraintBottom_toBottomOf = "id or parent"

链接文件资源文件失败

1 个答案: