在Android对话框中高效显示大文本视图
我试图使用一个对话框片段显示我的Android应用程序的一些许可信息,该对话框片段包含一个包装在ScrollView中的TextView。具体来说,我使用的是从GooglePlayServicesUtil.getOpenSourceSoftwareLicenseInfo()方法生成的字符串。这里生成的字符串包含大量文本,当我将所需信息传递给要显示的对话框时,UI线程会冻结大约3-4秒,然后最终显示对话框。有没有一种更有效的方法可以在DialogFragment中显示大量文本 下面是实例化和显示对话框的代码在Android对话框中高效显示大文本视图,android,textview,android-dialogfragment,Android,Textview,Android Dialogfragment,我试图使用一个对话框片段显示我的Android应用程序的一些许可信息,该对话框片段包含一个包装在ScrollView中的TextView。具体来说,我使用的是从GooglePlayServicesUtil.getOpenSourceSoftwareLicenseInfo()方法生成的字符串。这里生成的字符串包含大量文本,当我将所需信息传递给要显示的对话框时,UI线程会冻结大约3-4秒,然后最终显示对话框。有没有一种更有效的方法可以在DialogFragment中显示大量文本 下面是实例化和显示对
if(googlePlayServicesLicense != null) {
// Google Play Service License Info
TitleParagraphViewModel googlePlayInfo =
new TitleParagraphViewModel("Google Play Services",
googlePlayServicesLicense);
infoList.add(googlePlayInfo);
}
// Create license dialog and show
TitleParagraphListDialog dialog =
TitleParagraphListDialog.newInstance("Licenses", infoList);
// Show the dialog
dialog.show(getSupportFragmentManager(), "dialog");
这是我的DialogFragment的代码
public class TitleParagraphListDialog extends DialogFragment {
private static final String DIALOG_TITLE_EXTRA_KEY = "dialog_title";
private static final String DIALOG_INFO_LIST_EXTRA_KEY = "info_list";
private String mDialogTitle;
private ArrayList<TitleParagraphViewModel> mInfoList;
private TextView mInformation;
public static TitleParagraphListDialog newInstance(String title, ArrayList<TitleParagraphViewModel> infoList) {
TitleParagraphListDialog dialog = new TitleParagraphListDialog();
Bundle args = new Bundle();
args.putString(DIALOG_TITLE_EXTRA_KEY, title);
args.putParcelableArrayList(DIALOG_INFO_LIST_EXTRA_KEY, infoList);
dialog.setArguments(args);
return dialog;
}
@SuppressWarnings("unchecked")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle args = getArguments();
mDialogTitle = args.getString(DIALOG_TITLE_EXTRA_KEY) != null ? args.getString(DIALOG_TITLE_EXTRA_KEY) : "Information";
mInfoList = (ArrayList<TitleParagraphViewModel>) (args.getParcelableArrayList(DIALOG_INFO_LIST_EXTRA_KEY) != null ? args.getParcelableArrayList(DIALOG_INFO_LIST_EXTRA_KEY) : new ArrayList<TitleParagraphViewModel>());
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
View dialogView = inflater.inflate(R.layout.title_paragraph_dialog, null);
TextView dialogTitle = (TextView) dialogView.findViewById(R.id.dialog_title);
mInformation = (TextView) dialogView.findViewById(R.id.information);
dialogTitle.setText(mDialogTitle);
dialogTitle.setTypeface(Typeface.createFromAsset(getActivity()
.getAssets(), "fonts/Roboto-Light.ttf"));
mInformation.setTypeface(Typeface.createFromAsset(getActivity()
.getAssets(), "fonts/Roboto-Light.ttf"));
for(TitleParagraphViewModel info : mInfoList) {
mInformation.append(Html.fromHtml("<b>" + info.getTitle() + "</b>")
+ "\n\n" + info.getParagraph() + "\n\n");
}
builder.setView(dialogView)
.setPositiveButton("Done", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
TitleParagraphListDialog.this.getDialog().cancel();
}
});
return builder.create();
}
您可以做的是初始化某种进度条或“请稍候”对话框,然后在启动asynctask线程后立即在doInBackground上检索文本 这样你就避免了在UI线程上进行长时间调用,你的应用程序也不会冻结。 然后使用asynctask的onPostExecute删除“请稍候”对话框(或您选择使用的任何对话框)并显示文本 另一个想法是只调用滚动条中的几行,并在用户向下滚动时加载更多内容
很抱歉,如果a只回答了一些想法,希望它能给你一些启发。我最终将长文本拆分为一个单独的行数组,然后使用s显示该行数组 代码如下:
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.TypedValue;
import android.view.ContextThemeWrapper;
import android.view.LayoutInflater;
import android.view.ViewGroup;
import android.widget.TextView;
import com.google.android.gms.common.GoogleApiAvailability;
public class GoogleLicenseDialogFragment extends DialogFragment {
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
Activity activity = getActivity();
AlertDialog.Builder builder = new AlertDialog.Builder(activity)
.setPositiveButton(R.string.button_close, null);
GoogleApiAvailability googleApiAvailability = GoogleApiAvailability.getInstance();
String licenseInfo = googleApiAvailability.getOpenSourceSoftwareLicenseInfo(activity);
if (licenseInfo != null) {
Context context = getDialogContext(activity);
RecyclerView recyclerView = createRecyclerView(context);
recyclerView.setAdapter(new LongMessageAdapter(context, licenseInfo));
builder.setView(recyclerView);
}
return builder.create();
}
private Context getDialogContext(Context context) {
TypedValue outValue = new TypedValue();
int resId = android.support.v7.appcompat.R.attr.dialogTheme;
context.getTheme().resolveAttribute(resId, outValue, true);
int themeId = outValue.resourceId;
return themeId == 0 ? context : new ContextThemeWrapper(context, themeId);
}
private RecyclerView createRecyclerView(Context context) {
LayoutInflater inflater = LayoutInflater.from(context);
@SuppressLint("InflateParams")
RecyclerView recyclerView = (RecyclerView) inflater.inflate(R.layout.recycler_dialog, null);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(context));
return recyclerView;
}
private static final class LongMessageAdapter
extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private final Context context;
private final String[] lines;
public LongMessageAdapter(Context context, String message) {
this.context = context;
this.lines = message.split("\\n");
}
@Override
public int getItemCount() {
return lines.length;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
TextView textView = new TextView(context);
textView.setTextAppearance(context, R.style.TextAppearance_AppCompat_Subhead);
return new RecyclerView.ViewHolder(textView) {
};
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
((TextView) holder.itemView).setText(lines[position]);
}
}
}
导入android.annotation.SuppressLint;
导入android.app.Activity;
导入android.app.Dialog;
导入android.app.DialogFragment;
导入android.content.Context;
导入android.os.Bundle;
导入android.support.v7.app.AlertDialog;
导入android.support.v7.widget.LinearLayoutManager;
导入android.support.v7.widget.RecyclerView;
导入android.util.TypedValue;
导入android.view.contexthemewrapper;
导入android.view.LayoutInflater;
导入android.view.ViewGroup;
导入android.widget.TextView;
导入com.google.android.gms.common.GoogleAppAvailability;
公共类GoogleLicenseDialogFragment扩展了DialogFragment{
@凌驾
创建对话框上的公共对话框(Bundle savedInstanceState){
Activity=getActivity();
AlertDialog.Builder=新建AlertDialog.Builder(活动)
.setPositiveButton(R.string.button_close,null);
GoogleAppAvailability GoogleAppAvailability=GoogleAppAvailability.getInstance();
String licenseInfo=GoogleAppAvailability.getOpenSourceSoftwareLicenseInfo(活动);
如果(licenseInfo!=null){
上下文上下文=getDialogContext(活动);
RecyclerView RecyclerView=createRecyclerView(上下文);
setAdapter(新的LongMessageAdapter(上下文,licenseInfo));
builder.setView(recyclerView);
}
返回builder.create();
}
私有上下文getDialogContext(上下文上下文){
TypedValue outValue=新的TypedValue();
int resId=android.support.v7.appcompat.R.attr.dialogTheme;
context.getTheme().resolveAttribute(resId,outValue,true);
int-themeId=outValue.resourceId;
返回themeId==0?上下文:新的ContextThemeWrapper(上下文,themeId);
}
private RecyclerView createRecyclerView(上下文){
LayoutFlater充气机=LayoutFlater.from(上下文);
@SuppressLint(“充气参数”)
RecyclerView RecyclerView=(RecyclerView)充气器。充气(R.layout.recycler\u对话框,空);
recyclerView.setHasFixedSize(true);
setLayoutManager(新的LinearLayoutManager(上下文));
返回回收视图;
}
私有静态最终类LongMessageAdapter
扩展RecyclerView.Adapter{
私人最终语境;
私有最终字符串[]行;
公共LongMessageAdapter(上下文、字符串消息){
this.context=上下文;
this.lines=message.split(\\n”);
}
@凌驾
public int getItemCount(){
返回线长度;
}
@凌驾
public RecyclerView.ViewHolder onCreateViewHolder(视图组父级,int-viewType){
TextView TextView=新的TextView(上下文);
textView.setTextAppearance(上下文,R.style.TextAppearance\u AppCompat\u子标题);
返回新的RecyclerView.ViewHolder(textView){
};
}
@凌驾
BindViewHolder上的公共无效(RecyclerView.ViewHolder,int位置){
((TextView)holder.itemView).setText(行[位置]);
}
}
}
recycler_dialog.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="?attr/dialogPreferredPadding"
android:paddingRight="?attr/dialogPreferredPadding"
android:paddingTop="@dimen/abc_dialog_padding_top_material"
android:scrollbars="vertical"/>
现在已不推荐使用。应用程序不再需要显示此信息。
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="?attr/dialogPreferredPadding"
android:paddingRight="?attr/dialogPreferredPadding"
android:paddingTop="@dimen/abc_dialog_padding_top_material"
android:scrollbars="vertical"/>