Question

我试图制作一个简单的引用应用程序，但每次在我的下一个按钮后按下我的后退按钮它将转到下一个数组而不是向后。我使用int num跟踪用户所在的引用。这是我的后退按钮

package me.me.quote;


public class Startme extends Activity {
 Random gen= new Random();
int num;

 String[] quotes = new String[15];





public void next(View N){
         quotes[0]= "Love is timeless";
            quotes[1]= "I hate you";
            quotes[2]= "arggg!";
            quotes[3]= "The end is near";
            quotes[4]= "Leave be";

            if(num == 5){
                num =0;}



           TextView text = (TextView) findViewById(R.id.Quote);
           text.setText(quotes[num++]);



           TextView number = (TextView) findViewById(R.id.Qn);
            number.setText(""+num);

        }
public void back(View B){

 quotes[0]= "Love is timeless";
   quotes[1]= "I hate you";
   quotes[2]= "arggg!";
   quotes[3]= "The end is near";
   quotes[4]= "Leave be";

 TextView text = (TextView) findViewById(R.id.Quote);
 text.setText(quotes[num--]);

 TextView number = (TextView) findViewById(R.id.Qn);
    number.setText(""+num);}




  public void rand(View G)  {

 num = gen.nextInt(5);

  quotes[0]= "Love is timeless";
  quotes[1]= "I hate you";
  quotes[2]= "arggg!";
  quotes[3]= "The end is near";
  quotes[4]= "Leave be";
  TextView text = (TextView) findViewById(R.id.Quote);
  text.setText(quotes[num]);

TextView number = (TextView) findViewById(R.id.Qn);
number.setText(""+num);         
}


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.setContentView(R.layout.startquotes);

    TextView Dark=(TextView)findViewById(R.id.Quote); 
    Typeface face=Typeface.createFromAsset(getAssets(), "fonts/font1.ttf"); 
    Dark.setTypeface(face); 


}


}

Answer 1

// LAYOUT FILE text.xml

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

        <TextView
            android:id="@+id/textView"
            android:layout_width="wrap_content"
            android:layout_height="50dp"
            android:layout_alignParentTop="true"
            android:text="VISIBLE EVERY TIME"
            android:visibility="visible" />

        <Button
            android:id="@+id/back"
            android:layout_width="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_height="wrap_content"
            android:layout_below="@+id/textView"
            android:text="NEXT" >
        </Button>

        <Button
            android:id="@+id/next"
            android:layout_alignParentRight="true"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/textView"
            android:text="BACK" >
        </Button>

    </RelativeLayout>

/// ACTIVITY CLASS

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

    public class Test extends Activity {

        Button next;
        Button back ;
        TextView quoteText;
        int currentSelectedQuote=0;
        String[] quote={"QUOTE1","QUOTE2","QUOTE3","QUOTE4","QUOTE5",};

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);

            setContentView(R.layout.text);

            quoteText=(TextView)findViewById(R.id.textView);


            quoteText.setText(quote[currentSelectedQuote]);

             next=(Button)findViewById(R.id.next);

             next.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    currentSelectedQuote++;


                    if(currentSelectedQuote == 5){
                        currentSelectedQuote =0;}

                    quoteText.setText(quote[currentSelectedQuote]);

                }
            });
             back=(Button)findViewById(R.id.back); 

             back.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {

                    if(currentSelectedQuote==0)
                    {
                        currentSelectedQuote=4;
                    }
                    else
                    {
                    currentSelectedQuote--;
                    }

                    quoteText.setText(quote[currentSelectedQuote]);

                    // TODO Auto-generated method stub

                }
            });





        }

    }

Android Quote应用程序，下一个和后退按钮

1 个答案: