该程序中的所有内容都可以正常工作，除了 html。当我尝试使用x或任何其他 html 代码时，代码根本不会格式化它。有任何想法吗？我通常让 html 工作。html 不适用于任一字符串数组。我知道我还没有为第二个字符串数组定义 html。它只是不适用于我认为可行的第一个字符串数组。
package wompa.pro;
import java.util.Random;
import android.app.Activity;
import android.os.Bundle;
import android.text.Html;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.style.StyleSpan;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.Animation;
import android.view.animation.TranslateAnimation;
import android.widget.Button;
import android.widget.TextView;
import android.widget.ViewFlipper;
public class Flashcard extends Activity implements OnClickListener{
View.OnTouchListener gestureListener;
ViewFlipper flipper;
String facts[] = {
//Calculus
"Product Rule: d/dx(fg)=",
"Quotient Rule: d/dx(f/g)=",
"(d/dx)c=",
"(d/dx)cx=",
"(d/dx)x<sup>n</sup>=",
"(d/dx)e<sup>x</sup>=",
"(d/dx)ln(x)=",
"(d/dx)a<sup>x</sup>=",
"(d/dx)log<sub>a</sup>x=",
"(d/dx)sin(x)",
"(d/dx)cos(x)",
"(d/dx)tan(x)",
"(d/dx)csc(x)",
"(d/dx)sec(x)",
"(d/dx)cot(x)",
"d/dx(arcsin(x))",
"d/dx(arccos(x))",
"d/dx(arctan(x))",
"d/dx(arccsc(x))",
"d/dx(arcsec(x))",
"d/dx(arccot(x))",
};
String answers[] = {
//Biology ch. 9
"f'g+fg'",
"(f'g-fg')/g<sup>2</sup>",
"0",
"c",
"nx<sup>n-1</sup>",
"e<sup>x</sup>",
"1/x",
"a<sup>x</sup>lna",
"(1/x)(1/lna)",
"cos(x)",
"-sin(x)",
"sec<sup>2</sup>x",
"-cscxcotx",
"secxtanx",
"-csc<sup>2</sup>",
"1/(1-x<sup>2</sup>)<sup>1/2</sup>",
"-1/(1-x<sup>2</sup>)<sup>1/2</sup>",
"1/(1+x<sup>2</sup>)",
"-1/(1+x<sup>2</sup>)",
"1/(|x|(x<sup>2</sup>-1)<sup>1/2</sup>)",
"-1/(|x|(x<sup>2</sup>-1)<sup>1/2</sup>)",
};
private Animation inFromRightAnimation() {
Animation inFromRight = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, +1.0f, Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f
);
inFromRight.setDuration(500);
inFromRight.setInterpolator(new AccelerateInterpolator());
return inFromRight;
}
private Animation outToLeftAnimation() {
Animation outtoLeft = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, -1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f
);
outtoLeft.setDuration(500);
outtoLeft.setInterpolator(new AccelerateInterpolator());
return outtoLeft;
}
private Animation inFromLeftAnimation() {
Animation inFromLeft = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, -1.0f, Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f
);
inFromLeft.setDuration(500);
inFromLeft.setInterpolator(new AccelerateInterpolator());
return inFromLeft;
}
private Animation outToRightAnimation() {
Animation outtoRight = new TranslateAnimation(
Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, +1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f
);
outtoRight.setDuration(500);
outtoRight.setInterpolator(new AccelerateInterpolator());
return outtoRight;
}
TextView display, display1;
TextView counter;
Button begin;
Button next;
Button previous;
Button random;
Random myRandom;
TextView tvResults;
int index = facts.length;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
flipper = (ViewFlipper) findViewById(R.id.flipper);
Button button1 = (Button) findViewById(R.id.Button01);
Button button2 = (Button) findViewById(R.id.Button02);
TextView t = (TextView)findViewById(R.id.tvResults);
button1.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
flipper.setInAnimation(inFromRightAnimation());
flipper.setOutAnimation(outToLeftAnimation());
flipper.showNext();
}
});
button2.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
flipper.setInAnimation(inFromLeftAnimation());
flipper.setOutAnimation(outToRightAnimation());
flipper.showPrevious();
}
});
display = (TextView) findViewById(wompa.pro.R.id.tvResults);
display1 = (TextView) findViewById(wompa.pro.R.id.tvAnswers);
counter = (TextView) findViewById(wompa.pro.R.id.tvCounter);
next = (Button) findViewById(wompa.pro.R.id.Next);
previous = (Button) findViewById(wompa.pro.R.id.Previous);
random = (Button) findViewById(wompa.pro.R.id.Random);
next.setOnClickListener(this);
previous.setOnClickListener(this);
random.setOnClickListener(this);
myRandom = new Random();
index++;
if (index > facts.length - 1) {
index = 0;
}
showDisplay();}
private void showDisplay() {
Spanned span = Html.fromHtml(facts[index]);
SpannableStringBuilder builder = new SpannableStringBuilder(span);
int start = builder.nextSpanTransition(0, builder.length(), StyleSpan.class);
int stop = builder.nextSpanTransition(start, builder.length(), StyleSpan.class);
builder.setSpan(span, start, stop, Spanned.SPAN_INCLUSIVE_EXCLUSIVE);
display.setText(facts[index]);
display1.setText(answers[index]);
counter.setText(String.valueOf(index + 1) + "/"
+ String.valueOf(facts.length));
}
public void onClick(View arg0) {
// TODO Auto-generated method stub
switch (arg0.getId()) {
case wompa.pro.R.id.Next:
index++;
if (index > facts.length - 1) {
index = 0;
}
showDisplay();
break;
case wompa.pro.R.id.Previous:
index--;
if (index < 0) {
index = facts.length - 1;
}
showDisplay();
break;
case wompa.pro.R.id.Random:
index = (myRandom.nextInt(facts.length) - 1);
if (index < 0) {
index = facts.length - 1;
}
showDisplay();
break;
}
}
}