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法律研究如何在 Android 中建立分頁文字？
這個例子演示瞭如何在 Android 中建立分頁文字。
步驟 1 − 在 Android Studio 中建立一個新專案，轉到檔案 ⇒ 新專案並填寫所有必需的詳細資訊以建立一個新專案。
步驟 2 − 將以下程式碼新增到 res/layout/activity_main.xml 中。
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingLeft="16dp" android:paddingTop="16dp" android:paddingRight="16dp" android:paddingBottom="16dp"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent"> <Button android:id="@+id/btn_back" style="?android:attr/buttonBarButtonStyle" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:background="@android:color/transparent" /> <Button android:id="@+id/btn_forward" style="?android:attr/buttonBarButtonStyle" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="1" android:background="@android:color/transparent" /> </LinearLayout> <TextView android:id="@+id/tv" android:layout_width="match_parent" android:layout_height="match_parent" /> </RelativeLayout>
步驟 3 − 將以下程式碼新增到 src/MainActivity.java 中
package app.com.sample;
import android.graphics.Color;
import android.graphics.Typeface;
import android.os.Bundle;
import android.text.Html;
import android.text.Spannable;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.TextUtils;
import android.text.style.ForegroundColorSpan;
import android.text.style.RelativeSizeSpan;
import android.text.style.StyleSpan;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private TextView mTextView;
private Pagination mPagination;
private CharSequence mText;
private int mCurrentIndex = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextView = findViewById(R.id.tv);
Spanned htmlString = Html.fromHtml(getString(R.string.html_string));
Spannable spanString = new SpannableString(getString(R.string.long_string));
spanString.setSpan(new ForegroundColorSpan(Color.BLUE), 0, 24, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spanString.setSpan(new RelativeSizeSpan(2f), 0, 24, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spanString.setSpan(new StyleSpan(Typeface.MONOSPACE.getStyle()), 0, 24, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spanString.setSpan(new ForegroundColorSpan(Color.BLUE), 700, spanString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spanString.setSpan(new RelativeSizeSpan(2f), 700, spanString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spanString.setSpan(new StyleSpan(Typeface.MONOSPACE.getStyle()), 700, spanString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
mText = TextUtils.concat(htmlString, spanString);
mTextView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
// Removing layout listener to avoid multiple calls
mTextView.getViewTreeObserver().removeOnGlobalLayoutListener(this);
mPagination = new Pagination(
mText, mTextView.getWidth(),
mTextView.getHeight(),
mTextView.getPaint(),
mTextView.getLineSpacingMultiplier(),
mTextView.getLineSpacingExtra(),
mTextView.getIncludeFontPadding());
update();
}
});
findViewById(R.id.btn_back).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mCurrentIndex = (mCurrentIndex > 0) ? mCurrentIndex - 1 : 0;
update();
}
});
findViewById(R.id.btn_forward).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mCurrentIndex = (mCurrentIndex < mPagination.size() - 1) ? mCurrentIndex + 1 : mPagination.size() - 1;
update();
}
});
}
private void update() {
final CharSequence text = mPagination.get(mCurrentIndex);
if (text != null) mTextView.setText(text);
}
}步驟 4 − 將以下程式碼新增到 src/Pagination.java 中
package app.com.sample;
import android.text.Layout;
import android.text.StaticLayout;
import android.text.TextPaint;
import java.util.ArrayList;
import java.util.List;
class Pagination {
private final boolean mIncludePad;
private final int mWidth;
private final int mHeight;
private final float mSpacingMult;
private final float mSpacingAdd;
private final CharSequence mText;
private final TextPaint mPaint;
private final List<CharSequence> mPages;
Pagination(CharSequence text, int pageW, int pageH, TextPaint paint, float spacingMult, float spacingAdd, boolean inclidePad) {
this.mText = text;
this.mWidth = pageW;
this.mHeight = pageH;
this.mPaint = paint;
this.mSpacingMult = spacingMult;
this.mSpacingAdd = spacingAdd;
this.mIncludePad = inclidePad;
this.mPages = new ArrayList<>();
layout();
}
private void layout() {
final StaticLayout layout = new StaticLayout(mText, mPaint, mWidth, Layout.Alignment.ALIGN_NORMAL, mSpacingMult, mSpacingAdd, mIncludePad);
final int lines = layout.getLineCount();
final CharSequence text = layout.getText();
int startOffset = 0;
int height = mHeight;
for (int i = 0; i < lines; i++) {
if (height < layout.getLineBottom(i)) {
// When the layout height has been exceeded
addPage(text.subSequence(startOffset, layout.getLineStart(i)));
startOffset = layout.getLineStart(i);
height = layout.getLineTop(i) + mHeight;
}
if (i == lines - 1) {
// Put the rest of the text into the last page
addPage(text.subSequence(startOffset, layout.getLineEnd(i)));
return;
}
}
}
private void addPage(CharSequence text) {
mPages.add(text);
}
int size() {
return mPages.size();
}
CharSequence get(int index) {
return (index >= 0 && index < mPages.size()) ? mPages.get(index) : null;
}
}步驟 5 − 將以下程式碼新增到 androidManifest.xml 中
<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="app.com.sample"> <application android:allowBackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:roundIcon="@mipmap/ic_launcher_round" android:supportsRtl="true" android:theme="@style/AppTheme"> <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
讓我們嘗試執行你的應用程式。我假設你已經將你的實際 Android 移動裝置連線到你的電腦。要從 Android Studio 執行該應用程式，請開啟該專案的一個活動檔案，然後單擊工具欄中執行 
圖示。選擇你的移動裝置作為選項，然後檢查你的移動裝置，它將顯示你的預設螢幕 −
單擊此處下載專案程式碼。
更新於：2019 年 7 月 31 日
244 次瀏覽
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