Android应用程式-应用程式可运作,但运作缓慢
作者：互联网
这是我的第一个正式且已完成的应用程序…或者所以我想…这是我的一些问题(我也会发布代码)：
>加载应用程序时,ui出现大约需要3-6秒的时间…它所显示的只是标题
>我有一个进度条视图,在加载下一张图片时我可以看到它……永远都不会变得可见.
>当您单击下一个或上一个按钮时,该按钮将保持按下状态,直到加载为止
这些问题使我发疯…谁能指出正确的方向
Main.XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
android:id="@+id/widget210"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/lib/com.google.ads">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1">
<ImageView
android:id="@+id/ImageView01"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
<ProgressBar
android:indeterminate="true"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/progressBar1"
style="?android:attr/progressBarStyleLarge" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:text="Medium Text "
android:textAppearance="?android:attr/textAppearanceMedium"
android:ellipsize="end"
android:maxLines="2"
android:textColor="#88ffffff"
android:background="#88000000" android:gravity="center"/>
</RelativeLayout>
<TableLayout
android:id="@+id/widget214"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TableRow
android:id="@+id/widget215"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/Previous"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".5"
android:text="Previous"
android:onClick="GetPrevPic"/>
<Button
android:id="@+id/Next"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight=".5"
android:text="Next"
android:onClick="GetNextPic"/>
</TableRow>
</TableLayout>
<com.google.ads.AdView
android:id="@+id/adView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
ads:adSize="BANNER"
ads:adUnitId="xxxxxxxxxxxxxxx"
ads:loadAdOnCreate="true"/>
</LinearLayout>
爪哇
package com.ndai.funnys;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.*;
import android.widget.*;
import com.google.ads.*;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.w3c.dom.*;
public class GuysFunnysActivity extends Activity
{
String xml;
Document doc;
NodeList nodes;
int iIndex = 0;
int iTotal = 0;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
GetXMLStuff();
GetPic();
CheckForUpdates();
CheckForReferral();
}
public void GetXMLStuff()
{
xml = XMLfunctions.getXML();
doc = XMLfunctions.XMLfromString(xml);
nodes = doc.getElementsByTagName("item");
iTotal = nodes.getLength();
}
public void CheckForReferral()
{
SharedPreferences settings = getSharedPreferences("GuysFunnys", 0);
SharedPreferences.Editor editor = settings.edit();
long loads = settings.getLong("Loads", 0);
if (loads % 50 == 0)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("Thank you for using Guy's Funnys. Our app is only know to those who use it (it isn't in the Play Store). Please send a link for it to your friends. Send link now?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
Intent ii=new Intent(android.content.Intent.ACTION_SEND);
ii.setType("text/plain");
ii.putExtra(Intent.EXTRA_SUBJECT, "Share Guy's Funnys App");
ii.putExtra(Intent.EXTRA_TEXT, "I wanted to share this cool app with you - Guy's Funnys - https://sites.google.com/site/guysfunnysapp/Guys%20Funnys.apk");
startActivity(Intent.createChooser(ii, "Share Guy's Funnys App"));
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
dialog.cancel();
}
});
AlertDialog alert = builder.create();
alert.show();
}
editor.putLong("Loads",(loads + 1));
editor.commit();
}
public void CheckForUpdates()
{
PackageInfo pInfo;
try
{
pInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
int s = pInfo.versionCode;
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost("https://sites.google.com/site/guysfunnysapp/appversion.txt");
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
String line = EntityUtils.toString(httpEntity);
if (Long.valueOf(line) > s)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("A new verison of Guy's Funnys is ready to download. The older verisons will not work. Download Now?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
Update("https://sites.google.com/site/guysfunnysapp/Guys%20Funnys.apk");
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
finish();
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
catch (NameNotFoundException e)
{
e.printStackTrace();
}
catch (ClientProtocolException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
}
public void Update(String apkurl)
{
try
{
URL url = new URL(apkurl);
HttpURLConnection c = (HttpURLConnection) url.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
String PATH = Environment.getExternalStorageDirectory() + "/download/";
File file = new File(PATH);
file.mkdirs();
File outputFile = new File(file, "app.apk");
FileOutputStream fos = new FileOutputStream(outputFile);
InputStream is = c.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1)
{
fos.write(buffer, 0, len1);
}
fos.close();
is.close();
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory() + "/download/" + "app.apk")), "application/vnd.android.package-archive");
startActivity(intent);
}
catch (IOException e)
{
Toast.makeText(getApplicationContext(), "Update error!", Toast.LENGTH_LONG).show();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
menu.add(1, 1, 0, "View Page").setIcon(R.drawable.pageico);
menu.add(1, 2, 1, "Share Pic").setIcon(R.drawable.shareico);
menu.add(1, 3, 2, "Share App").setIcon(R.drawable.shareico);
menu.add(1, 4, 2, "Exit").setIcon(R.drawable.exitico);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
Element e = (Element)nodes.item(iIndex);
switch(item.getItemId())
{
case 1:
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(XMLfunctions.getValue(e, "link")));
startActivity(browserIntent);
return true;
case 2:
Intent i=new Intent(android.content.Intent.ACTION_SEND);
i.setType("text/plain");
i.putExtra(Intent.EXTRA_SUBJECT, "Guy's Funnys");
i.putExtra(Intent.EXTRA_TEXT, XMLfunctions.getValue(e, "guid"));
startActivity(Intent.createChooser(i, "Guy's Funnys"));
return true;
case 3:
Intent ii=new Intent(android.content.Intent.ACTION_SEND);
ii.setType("text/plain");
ii.putExtra(Intent.EXTRA_SUBJECT, "Share Guy's Funnys App");
ii.putExtra(Intent.EXTRA_TEXT, "I wanted to share this cool app with you - Guy's Funnys - https://sites.google.com/site/guysfunnysapp/Guys%20Funnys.apk");
startActivity(Intent.createChooser(ii, "Share Guy's Funnys App"));
return true;
case 4:
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
public void GetNextPic(View view)
{
iIndex++;
if (iIndex == iTotal)
{
iIndex--;
Toast.makeText(this, "At last photo", Toast.LENGTH_LONG).show();
}
else
{
GetPic();
AdView adView = (AdView)this.findViewById(R.id.adView);
adView.loadAd(new AdRequest());
}
}
public void GetPrevPic(View view)
{
iIndex--;
if (iIndex == -1)
{
iIndex++;
Toast.makeText(this, "At first photo", Toast.LENGTH_LONG).show();
}
else
{
GetPic();
AdView adView = (AdView)this.findViewById(R.id.adView);
adView.loadAd(new AdRequest());
}
}
public void ShowDebug(View v)
{
}
public void GetPic()
{
ProgressBar progressBar = (ProgressBar) this.findViewById(R.id.progressBar1);
progressBar.setVisibility(View.VISIBLE);
ImageView imgView =(ImageView)findViewById(R.id.ImageView01);
TextView txtView =(TextView)findViewById(R.id.textView1);
if (iTotal==0)
{
txtView.setText("Network Error");
Toast.makeText(this, "Error connecting to server. Try again later", Toast.LENGTH_LONG).show();
}
else
{
Element e = (Element)nodes.item(iIndex);
txtView.setText(XMLfunctions.getValue(e, "title"));
Drawable drawable = LoadImageFromWebOperations(XMLfunctions.getValue(e, "guid"));
imgView.setImageDrawable(drawable);
}
progressBar.setVisibility(View.INVISIBLE);
}
private Drawable LoadImageFromWebOperations(String url)
{
try
{
InputStream is = (InputStream) new URL(url).getContent();
Drawable d = Drawable.createFromStream(is, "src name");
return d;
}
catch (Exception e)
{
System.out.println("Exc="+e);
return null;
}
}
}
解决方法:
看来您正在主UI线程上建立网络连接,例如：checkForUpdates().建立网络连接应该在后台线程的帮助下进行. AsyncTask将使您更轻松.就目前而言,您正在捆绑UI线程,这将导致UI出现“滞后”问题.
http://developer.android.com/reference/android/os/AsyncTask.html
标签：performance,progress-bar,android 来源： https://codeday.me/bug/20191201/2078103.html