android - Android：致命异常主要

Question

好的，所以我是编程的初学者，这是我的第一个编程项目。我想做的是创建一个“励志名言”应用程序，其中包含大约 10 个人，每个人都有多个引号。只是一些简单的视图翻转和随机化数组。我正在编写视图翻转部分的代码，然后当我尝试在模拟器中运行它时，它给了我“应用程序已意外停止”。Logcat 显示“FATAL EXCEPTION Main”。希望有人可以帮助我完成这项工作，我陷入了死胡同，截止日期很快就结束了。

我试着四处搜索，大多数都要求 src、main.xml 和 manifest.xml，所以我将它们发布在这里：

源代码：

package first.motivationalquotes;

import java.util.Random;
import android.app.Activity;
import android.content.res.Resources;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.ViewFlipper;

public class MotivationalQuotesActivity extends Activity {
    /** Called when the activity is first created. */

Button next,previous;
ViewFlipper vf;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        next = (Button) findViewById(R.id.button1);
        previous = (Button) findViewById(R.id.button2);
        next.setOnClickListener((OnClickListener) this);
        previous.setOnClickListener((OnClickListener) this);
        vf=(ViewFlipper)findViewById(R.id.viewFlipper1);
    }

    public void randomize(View v)
    {
        Random ran = new Random();
        String[] ButtonText = null;
        Resources res = getResources();
        ButtonText = res.getStringArray(R.array.Quotes);
        String strRandom = ButtonText[ran.nextInt(ButtonText.length)];
        System.out.println("Random string is : "+strRandom);

        TextView tv = (TextView) findViewById(R.id.textView2);
        tv.setText(ButtonText[ran.nextInt(ButtonText.length)]);
    }

    public void onClick(View v) {
        if (v == next) {
            vf.showNext();
        }
        if (v == previous) {
            vf.showPrevious();
        }
    }

}

接下来是 main.xml（目前仅编码为 2 人）：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <ViewFlipper
        android:id="@+id/viewFlipper1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <!-- View 1- Einstein - person1 -->
         <TableLayout 
         android:orientation="vertical"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent" >

        <TableRow>
        <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Albert Einstein"
        android:layout_gravity="center"
        android:textSize="28dp" >
        </TextView>
        </TableRow>

        <TableRow>

            <ImageView
                android:id="@+id/imageView1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:src="@drawable/clear_einstein" />

        </TableRow>

        <TableRow>
        <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/einstein1"
        android:textAppearance="?android:attr/textAppearanceMedium" />
        </TableRow>

    </TableLayout>

         <!-- View 2- Tesla - person2 -->
     <TableLayout 
         android:orientation="vertical"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent" >

        <TableRow>
        <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Nikola Tesla"
        android:layout_gravity="center"
        android:textSize="28dp" >
        </TextView>
        </TableRow>

        <TableRow>
        <ImageView
        android:id="@+id/imageView1"
        android:layout_weight="1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/nikola_tesla" />
        </TableRow>

        <TableRow>
        <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/einstein1"
        android:textAppearance="?android:attr/textAppearanceMedium" />
        </TableRow>

    </TableLayout>

     <TableLayout 
         android:orientation="vertical"
         android:layout_width="fill_parent"
         android:layout_height="fill_parent" >

        <TableRow>
        <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Albert Einstein"
        android:layout_gravity="center"
        android:textSize="28dp" >
        </TextView>
        </TableRow>

        <TableRow>
        <ImageView
        android:id="@+id/imageView1"
        android:layout_weight="1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/clear_einstein" />
        </TableRow>

        <TableRow>
        <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/einstein1"
        android:textAppearance="?android:attr/textAppearanceMedium" />
        </TableRow>

    </TableLayout>

    </ViewFlipper>

     <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal" 
        android:layout_gravity="center">
    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="button2Click"
        android:clickable="true"
        android:text="&lt;Previous"
        android:layout_gravity="center" />
    <Button
        android:id="@+id/aboutMeButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="randomize"
        android:text="Randomize" 
        android:layout_gravity="center"/>
    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="button1Click"
        android:text="Next&gt;" 
        android:layout_gravity="center"/>
    </LinearLayout>

    </LinearLayout>

然后是 manifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="first.motivationalquotes"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".MotivationalQuotesActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Logcat：http: //i56.photobucket.com/albums/g183/luq_man/Logcat.png

score 1 · Accepted Answer

我认为你必须实现 OnClickListener。

公共 MotivationalQuotesActivity 扩展 Activity 实现 OnClickListener{

…… }

score 0 · Accepted Answer

可能忘记实施OnClickListener？

public class MyActivity extends Activity implements View.OnClickListener

或者是这样的：

public class MyActivity extends Activity {
Button next, previous;
ViewFlipper vf;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    next = (Button) findViewById(R.id.button1);
    previous = (Button) findViewById(R.id.button2);
    next.setOnClickListener(nextOnClick);//<--------new listener
    previous.setOnClickListener(previousOnClick);//<--------new listener
    vf = (ViewFlipper) findViewById(R.id.viewFlipper1);
}

private View.OnClickListener nextOnClick = new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        vf.showNext();
    }
};

private View.OnClickListener previousOnClick = new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        vf.showPrevious();
    }
};

android - Android：致命异常主要

2 回答 2

Related

Reference