java - 我的应用程序崩溃了 android eclipse？

Question

当我在 Android 设备上运行 Android 应用程序时，出现错误。 它说不幸的是，GuessingGame 已停止。它之前运行过，但自从我向布局添加 EditText 后，它就一直崩溃。这是我的 MainActivity.java:

package com.h2ogaming.numberguessinggame;

import java.util.Random;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends Activity {

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

        final TextView textOne = (TextView) findViewById(R.id.textView1);
        Button pressMe = (Button) findViewById(R.id.button1);



    pressMe.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            String randText = "";
            // TODO Auto-generated method stub
            Random randGen = new Random();
            int random = randGen.nextInt(5) + 1;
            randText = Integer.toString(random);
            textOne.setText(randText);
        }
    });
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

}

这是我的 Activity_Main XML 文件:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" 
    android:background="#2288ee">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="79dp"
        android:text="@string/guess_text"
        android:textColor="#ffffff"
        android:textSize="26sp" />

    <EditText
        android:id="@+id/editText1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView2"
        android:layout_centerHorizontal="true"
        android:ems="10"
        android:inputType="number" >

        <requestFocus />
        </EditText>

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/editText1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="19dp"
        android:text="@string/text_view1"
        android:textColor="#ffffff"
        android:textSize="26sp" />

    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="22dp"
        android:text="@string/btn_press" />

</RelativeLayout>

请帮助我。谢谢!

Answer 1

更改组件的初始化。在全局范围内声明所有组件。然后像下面的代码一样初始化它:

public class MainActivity extends Activity {
 TextView textOne;
 Button pressMe;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textOne = (TextView) findViewById(R.id.textView1);
        pressMe = (Button) findViewById(R.id.button1);