Java 字符串格式不正确
我正在处理PDF渲染,现在出现错误消息:“格式字符串不是有效格式”。到目前为止,我掌握的代码是:Java 字符串格式不正确,java,android,Java,Android,我正在处理PDF渲染,现在出现错误消息:“格式字符串不是有效格式”。到目前为止,我掌握的代码是: import android.app.Fragment; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.pdf.PdfRenderer; import android.os.Bundle; import android.os.ParcelFileDescriptor; impo
import android.app.Fragment;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.pdf.PdfRenderer;
import android.os.Bundle;
import android.os.ParcelFileDescriptor;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import java.io.IOException;
/**
*/
public class PDFRenderFragment extends android.support.v4.app.Fragment {
private ParcelFileDescriptor fileDescriptor;
private PdfRenderer pdfRenderer;
private PdfRenderer.Page currentPage;
private ImageView image;
private Button btnPrevious;
private Button btnNext;
public PDFRenderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_pdfrender, container, false);
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// Retain view references.
image = (ImageView) view.findViewById(R.id.image);
btnPrevious = (Button) view.findViewById(R.id.btn_previous);
btnNext = (Button) view.findViewById(R.id.btn_next);
//set buttons event
btnPrevious.setOnClickListener(onActionListener(-1)); //previous button clicked
btnNext.setOnClickListener(onActionListener(1)); //next button clicked
int index = 0;
// If there is a savedInstanceState (screen orientations, etc.), we restore the page index.
if (null != savedInstanceState) {
index = savedInstanceState.getInt("current_page", 0);
}
showPage(index);
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
openRenderer(activity);
} catch (IOException e) {
e.printStackTrace();
Log.i("Fragment", "Error occurred!");
Log.e("Fragment", e.getMessage());
activity.finish();
}
}
@Override
public void onDestroy() {
try {
closeRenderer();
} catch (IOException e) {
e.printStackTrace();
}
super.onDestroy();
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
if (null != currentPage) {
outState.putInt("current_page", currentPage.getIndex());
}
}
/**
* Create a PDF renderer
* @param activity
* @throws IOException
*/
private void openRenderer(Activity activity) throws IOException {
// Reading a PDF file from the assets directory.
fileDescriptor = activity.getAssets().openFd("*****.pdf").getParcelFileDescriptor();
// This is the PdfRenderer we use to render the PDF.
pdfRenderer = new PdfRenderer(fileDescriptor);
}
/**
* Closes PdfRenderer and related resources.
*/
private void closeRenderer() throws IOException {
if (null != currentPage) {
currentPage.close();
}
pdfRenderer.close();
fileDescriptor.close();
}
/**
* Shows the specified page of PDF file to screen
* @param index The page index.
*/
private void showPage(int index) {
if (pdfRenderer.getPageCount() <= index) {
return;
}
// Make sure to close the current page before opening another one.
if (null != currentPage) {
currentPage.close();
}
//open a specific page in PDF file
currentPage = pdfRenderer.openPage(index);
// Important: the destination bitmap must be ARGB (not RGB).
Bitmap bitmap = Bitmap.createBitmap(currentPage.getWidth(), currentPage.getHeight(),
Bitmap.Config.ARGB_8888);
// Here, we render the page onto the Bitmap.
currentPage.render(bitmap, null, null, PdfRenderer.Page.RENDER_MODE_FOR_DISPLAY);
// showing bitmap to an imageview
image.setImageBitmap(bitmap);
updateUIData();
}
/**
* Updates the state of 2 control buttons in response to the current page index.
*/
private void updateUIData() {
int index = currentPage.getIndex();
int pageCount = pdfRenderer.getPageCount();
btnPrevious.setEnabled(0 != index);
btnNext.setEnabled(index + 1 < pageCount);
getActivity().setTitle(getString(R.string.app_name , index + 1, pageCount));
}
private View.OnClickListener onActionListener(final int i) {
return new View.OnClickListener() {
@Override
public void onClick(View v) {
if (i < 0) {//go to previous page
showPage(currentPage.getIndex() - 1);
} else {
showPage(currentPage.getIndex() + 1);
}
}
};
}
}
导入android.app.Fragment;
导入android.app.Activity;
导入android.graphics.Bitmap;
导入android.graphics.pdf.PdfRenderer;
导入android.os.Bundle;
导入android.os.ParcelFileDescriptor;
导入android.util.Log;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.Button;
导入android.widget.ImageView;
导入java.io.IOException;
/**
*/
公共类PDFRenderFragment扩展了android.support.v4.app.Fragment{
专用ParcelFileDescriptor文件描述符;
私人PdfRenderer PdfRenderer;
私人PDFRender.Page当前页面;
私有图像查看图像;
私人按钮BTN先前;
私人按钮btnNext;
公共PDFRenderFragment(){
}
@凌驾
创建视图上的公共视图(布局、充气机、视图组容器、,
Bundle savedInstanceState){
返回充气机。充气(R.layout.fragment\u pdfrender,容器,错误);
}
@凌驾
已创建视图上的公共void(视图,捆绑保存状态){
super.onViewCreated(视图,savedInstanceState);
//保留视图引用。
image=(ImageView)view.findviewbyd(R.id.image);
btnPrevious=(按钮)view.findViewById(R.id.btn_previous);
btnNext=(按钮)view.findviewbyd(R.id.btn_next);
//设置按钮事件
btnPrevious.setOnClickListener(onActionListener(-1));//单击了上一个按钮
btnNext.setOnClickListener(onActionListener(1));//单击下一步按钮
int指数=0;
//如果存在savedInstanceState(屏幕方向等),则恢复页面索引。
如果(null!=savedInstanceState){
index=savedInstanceState.getInt(“当前页面”,0);
}
展示页(索引);
}
@凌驾
公共事务主任(活动){
超级转速计(活动);
试一试{
公开展览(活动);
}捕获(IOE异常){
e、 printStackTrace();
Log.i(“片段”,“发生错误!”);
Log.e(“片段”,e.getMessage());
activity.finish();
}
}
@凌驾
公共空间{
试一试{
关闭渲染器();
}捕获(IOE异常){
e、 printStackTrace();
}
super.ondestory();
}
@凌驾
SaveInstanceState上的公共无效(束超出状态){
super.onSaveInstanceState(超出状态);
如果(null!=currentPage){
outState.putInt(“当前页面”,currentPage.getIndex());
}
}
/**
*创建PDF渲染器
*@param活动
*@抛出异常
*/
私有void openRenderer(活动)引发IOException{
//正在从资产目录中读取PDF文件。
fileDescriptor=activity.getAssets().openFd(“******.pdf”).getParcelFileDescriptor();
//这是我们用来渲染PDF的PdfRenderer。
pdfRenderer=新的pdfRenderer(文件描述符);
}
/**
*关闭PdfRenderer和相关资源。
*/
私有void closeRenderer()引发IOException{
如果(null!=currentPage){
currentPage.close();
}
pdfRenderer.close();
fileDescriptor.close();
}
/**
*显示要显示的PDF文件的指定页面
*@param index页面索引。
*/
专用void显示页(整数索引){
如果(pdfRenderer.getPageCount()如果希望在标题中同时显示索引
和pageCount
,请按以下步骤执行:
1.将strings.xml文件中的字符串更改为:
<string name="app_name">NewApp2 %1$d / %2$d </string>
错误消息是否给出了导致错误的行的指示?因此,我只需替换字符串名称并添加一个额外的行?@Desthstro:Yes替换字符串名称,就像这样
是必需的,但不需要额外的行,它只是为了使代码更可读。您可以按当前的方式执行。
<string name="app_name">NewApp2 %1$d / %2$d </string>
String strTitle= getString(R.string.app_name , index + 1, pageCount);
getActivity().setTitle(strTitle);