＆QUOT;不幸的是，...已经停止＆QUOT;在Android的下载文件时， [英] "Unfortunately, ... has stopped" when Downloading file in Android
本文介绍了＆QUOT;不幸的是，...已经停止＆QUOT;在Android的下载文件时，的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图在Android的Studio中的应用程序，它要求你将文件下载到用户设备上的SD卡/下载/文件夹。问题是，当我输入从下载并点击下载网址，应用程序说不幸的是，*已停止。我有好几个文件，以便他们在这里。
I'm trying to make an app in Android Studio which requires you to download a file to the sdcard/Download/ folder on the users device. The problem is that when I enter the URL to download from and click Download, the app says "Unfortunately, * has stopped". I have quite a few files so here they are.
首先，继承人的清单...
First, heres the Manifest...
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.NautGames.xecta.app" >
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.NautGames.xecta.app.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<!-- Permission: Writing to SDCard -->
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
</manifest>
继承人的MainActivity类...
Heres the MainActivity class...
package com.NautGames.xecta.app;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
//Chat bot library
import org.alicebot.ab.Chat;
import org.alicebot.ab.Bot;
import android.view.View;
import android.widget.Button;
import android.os.Environment;
import android.widget.TextView;
public class MainActivity extends ActionBarActivity {
TextView input;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
//EditText mEdit = (EditText)findViewById(R.id.editText1);
public void buttonOnClick(View v)
{
input = (TextView) findViewById(R.id.editText1);
String dbPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Download/Ab";
Button button=(Button) v;
//Creating bot
String botname="xecta";
String path= dbPath;
Bot xecta = new Bot(botname, path);
Chat chatSession = new Chat(xecta);
String request = input.getText().toString();
String response = chatSession.multisentenceRespond(request);
((Button) v).setText(response);
}
public void buttonDownload(View v)
{
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
DownloaderThread（下载文件）...
DownloaderThread (to download file)...
package com.NautGames.xecta.app;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import android.os.Environment;
import android.os.Message;
/**
* Downloads a file in a thread. Will send messages to the
* AndroidFileDownloader activity to update the progress bar.
*/
public class DownloaderThread extends Thread
{
// constants
private static final int DOWNLOAD_BUFFER_SIZE = 4096;
// instance variables
private AndroidFileDownloader parentActivity;
private String downloadUrl;
/**
//Instantiates a new DownloaderThread object.
// @param parentActivity Reference to AndroidFileDownloader activity.
// @param inUrl String representing the URL of the file to be downloaded.
*/
public DownloaderThread(AndroidFileDownloader inParentActivity, String inUrl)
{
downloadUrl = "";
if(inUrl != null)
{
downloadUrl = inUrl;
}
parentActivity = inParentActivity;
}
/**
* Connects to the URL of the file, begins the download, and notifies the
* AndroidFileDownloader activity of changes in state. Writes the file to
* the root of the SD card.
*/
@Override
public void run()
{
URL url;
URLConnection conn;
int fileSize, lastSlash;
String fileName;
BufferedInputStream inStream;
BufferedOutputStream outStream;
File outFile;
FileOutputStream fileStream;
Message msg;
// we're going to connect now
msg = Message.obtain(parentActivity.activityHandler,
AndroidFileDownloader.MESSAGE_CONNECTING_STARTED,
0, 0, downloadUrl);
parentActivity.activityHandler.sendMessage(msg);
try
{
url = new URL(downloadUrl);
conn = url.openConnection();
conn.setUseCaches(false);
fileSize = conn.getContentLength();
// get the filename
lastSlash = url.toString().lastIndexOf('/');
fileName = "file.bin";
if(lastSlash >=0)
{
fileName = url.toString().substring(lastSlash + 1);
}
if(fileName.equals(""))
{
fileName = "file.bin";
}
// notify download start
int fileSizeInKB = fileSize / 1024;
msg = Message.obtain(parentActivity.activityHandler,
AndroidFileDownloader.MESSAGE_DOWNLOAD_STARTED,
fileSizeInKB, 0, fileName);
parentActivity.activityHandler.sendMessage(msg);
// start download
inStream = new BufferedInputStream(conn.getInputStream());
outFile = new File(Environment.getExternalStorageDirectory() + "/" + fileName);
fileStream = new FileOutputStream(outFile);
outStream = new BufferedOutputStream(fileStream, DOWNLOAD_BUFFER_SIZE);
byte[] data = new byte[DOWNLOAD_BUFFER_SIZE];
int bytesRead = 0, totalRead = 0;
while(!isInterrupted() && (bytesRead = inStream.read(data, 0, data.length)) >= 0)
{
outStream.write(data, 0, bytesRead);
// update progress bar
totalRead += bytesRead;
int totalReadInKB = totalRead / 1024;
msg = Message.obtain(parentActivity.activityHandler,
AndroidFileDownloader.MESSAGE_UPDATE_PROGRESS_BAR,
totalReadInKB, 0);
parentActivity.activityHandler.sendMessage(msg);
}
outStream.close();
fileStream.close();
inStream.close();
if(isInterrupted())
{
// the download was canceled, so let's delete the partially downloaded file
outFile.delete();
}
else
{
// notify completion
msg = Message.obtain(parentActivity.activityHandler,
AndroidFileDownloader.MESSAGE_DOWNLOAD_COMPLETE);
parentActivity.activityHandler.sendMessage(msg);
}
}
catch(MalformedURLException e)
{
String errMsg = parentActivity.getString(R.string.error_message_bad_url);
msg = Message.obtain(parentActivity.activityHandler,
AndroidFileDownloader.MESSAGE_ENCOUNTERED_ERROR,
0, 0, errMsg);
parentActivity.activityHandler.sendMessage(msg);
}
catch(FileNotFoundException e)
{
String errMsg = parentActivity.getString(R.string.error_message_file_not_found);
msg = Message.obtain(parentActivity.activityHandler,
AndroidFileDownloader.MESSAGE_ENCOUNTERED_ERROR,
0, 0, errMsg);
parentActivity.activityHandler.sendMessage(msg);
}
catch(Exception e)
{
String errMsg = parentActivity.getString(R.string.error_message_general);
msg = Message.obtain(parentActivity.activityHandler,
AndroidFileDownloader.MESSAGE_ENCOUNTERED_ERROR,
0, 0, errMsg);
parentActivity.activityHandler.sendMessage(msg);
}
}
}
最后，该AndroidFileDownload（也下载文件）...
And lastly, The AndroidFileDownload(also to download file)...
package com.NautGames.xecta.app;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class AndroidFileDownloader extends Activity implements OnClickListener
{
// Used to communicate state changes in the DownloaderThread
public static final int MESSAGE_DOWNLOAD_STARTED = 1000;
public static final int MESSAGE_DOWNLOAD_COMPLETE = 1001;
public static final int MESSAGE_UPDATE_PROGRESS_BAR = 1002;
public static final int MESSAGE_DOWNLOAD_CANCELED = 1003;
public static final int MESSAGE_CONNECTING_STARTED = 1004;
public static final int MESSAGE_ENCOUNTERED_ERROR = 1005;
// instance variables
private AndroidFileDownloader thisActivity;
private Thread downloaderThread;
private ProgressDialog progressDialog;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
thisActivity = this;
downloaderThread = null;
progressDialog = null;
setContentView(R.layout.activity_main);
Button button = (Button) this.findViewById(R.id.download_button);
button.setOnClickListener(this);
}
/** Called when the user clicks on something. */
@Override
public void onClick(View view)
{
EditText urlInputField = (EditText) this.findViewById(R.id.url_input);
String urlInput = urlInputField.getText().toString();
downloaderThread = new DownloaderThread(thisActivity, urlInput);
downloaderThread.start();
}
/**
* This is the Handler for this activity. It will receive messages from the
* DownloaderThread and make the necessary updates to the UI.
*/
public Handler activityHandler = new Handler()
{
public void handleMessage(Message msg)
{
switch(msg.what)
{
/*
* Handling MESSAGE_UPDATE_PROGRESS_BAR:
* 1. Get the current progress, as indicated in the arg1 field
* of the Message.
* 2. Update the progress bar.
*/
case MESSAGE_UPDATE_PROGRESS_BAR:
if(progressDialog != null)
{
int currentProgress = msg.arg1;
progressDialog.setProgress(currentProgress);
}
break;
/*
* Handling MESSAGE_CONNECTING_STARTED:
* 1. Get the URL of the file being downloaded. This is stored
* in the obj field of the Message.
* 2. Create an indeterminate progress bar.
* 3. Set the message that should be sent if user cancels.
* 4. Show the progress bar.
*/
case MESSAGE_CONNECTING_STARTED:
if(msg.obj != null && msg.obj instanceof String)
{
String url = (String) msg.obj;
// truncate the url
if(url.length() > 16)
{
String tUrl = url.substring(0, 15);
tUrl += "...";
url = tUrl;
}
String pdTitle = thisActivity.getString(R.string.progress_dialog_title_connecting);
String pdMsg = thisActivity.getString(R.string.progress_dialog_message_prefix_connecting);
pdMsg += " " + url;
dismissCurrentProgressDialog();
progressDialog = new ProgressDialog(thisActivity);
progressDialog.setTitle(pdTitle);
progressDialog.setMessage(pdMsg);
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressDialog.setIndeterminate(true);
// set the message to be sent when this dialog is canceled
Message newMsg = Message.obtain(this, MESSAGE_DOWNLOAD_CANCELED);
progressDialog.setCancelMessage(newMsg);
progressDialog.show();
}
break;
/*
* Handling MESSAGE_DOWNLOAD_STARTED:
* 1. Create a progress bar with specified max value and current
* value 0; assign it to progressDialog. The arg1 field will
* contain the max value.
* 2. Set the title and text for the progress bar. The obj
* field of the Message will contain a String that
* represents the name of the file being downloaded.
* 3. Set the message that should be sent if dialog is canceled.
* 4. Make the progress bar visible.
*/
case MESSAGE_DOWNLOAD_STARTED:
// obj will contain a String representing the file name
if(msg.obj != null && msg.obj instanceof String)
{
int maxValue = msg.arg1;
String fileName = (String) msg.obj;
String pdTitle = thisActivity.getString(R.string.progress_dialog_title_downloading);
String pdMsg = thisActivity.getString(R.string.progress_dialog_message_prefix_downloading);
pdMsg += " " + fileName;
dismissCurrentProgressDialog();
progressDialog = new ProgressDialog(thisActivity);
progressDialog.setTitle(pdTitle);
progressDialog.setMessage(pdMsg);
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.setProgress(0);
progressDialog.setMax(maxValue);
// set the message to be sent when this dialog is canceled
Message newMsg = Message.obtain(this, MESSAGE_DOWNLOAD_CANCELED);
progressDialog.setCancelMessage(newMsg);
progressDialog.setCancelable(true);
progressDialog.show();
}
break;
/*
* Handling MESSAGE_DOWNLOAD_COMPLETE:
* 1. Remove the progress bar from the screen.
* 2. Display Toast that says download is complete.
*/
case MESSAGE_DOWNLOAD_COMPLETE:
dismissCurrentProgressDialog();
displayMessage(getString(R.string.user_message_download_complete));
break;
/*
* Handling MESSAGE_DOWNLOAD_CANCELLED:
* 1. Interrupt the downloader thread.
* 2. Remove the progress bar from the screen.
* 3. Display Toast that says download is complete.
*/
case MESSAGE_DOWNLOAD_CANCELED:
if(downloaderThread != null)
{
downloaderThread.interrupt();
}
dismissCurrentProgressDialog();
displayMessage(getString(R.string.user_message_download_canceled));
break;
/*
* Handling MESSAGE_ENCOUNTERED_ERROR:
* 1. Check the obj field of the message for the actual error
* message that will be displayed to the user.
* 2. Remove any progress bars from the screen.
* 3. Display a Toast with the error message.
*/
case MESSAGE_ENCOUNTERED_ERROR:
// obj will contain a string representing the error message
if(msg.obj != null && msg.obj instanceof String)
{
String errorMessage = (String) msg.obj;
dismissCurrentProgressDialog();
displayMessage(errorMessage);
}
break;
default:
// nothing to do here
break;
}
}
};
/**
* If there is a progress dialog, dismiss it and set progressDialog to
* null.
*/
public void dismissCurrentProgressDialog()
{
if(progressDialog != null)
{
progressDialog.hide();
progressDialog.dismiss();
progressDialog = null;
}
}
/**
* Displays a message to the user, in the form of a Toast.
* @param message Message to be displayed.
*/
public void displayMessage(String message)
{
if(message != null)
{
Toast.makeText(thisActivity, message, Toast.LENGTH_SHORT).show();
}
}
}
和继承人的日志：
Process: com.NautGames.xecta.app, PID: 3032
java.lang.IllegalStateException: Could not find a method onClick(View) in the activity class com.NautGames.xecta.app.MainActivity for onClick handler on view class android.widget.Button with id 'download_button'
at android.view.View$1.onClick(View.java:3810)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.om.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NoSuchMethodException: onClick [class android.view.View]
at java.lang.Class.getConstructorOrMethod(Class.java:472)
at java.lang.Class.getMethod(Class.java:857)
at android.view.View$1.onClick(View.java:3803)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
谁能告诉我是什么问题？ 先谢谢了。
Could anyone tell me what the problem is? Thanks in advance.
推荐答案
既然你说这是在 AndroidFileDownload ，我建议你做如下：
Since you said it's in AndroidFileDownload, I'd suggest you to do as follows:
@Override
public void onClick(View view)
// you need to get the id of the clicked view:
if(view.getId() == R.id.download_button) {
EditText urlInputField = (EditText) thisActivity.findViewById(R.id.url_input);
String urlInput = urlInputField.getText().toString();
downloaderThread = new DownloaderThread(thisActivity, urlInput);
downloaderThread.start();
}
}
这是原因： NoSuchMethodException：的onClick [类android.view.View] 。这意味着，你的的onClick 方法找不到您的按钮（ ID ），您也设置一个 onClickListener 方法。
This is the cause of: NoSuchMethodException: onClick [class android.view.View]. It means that your onClick method cannot find your button (id) where you did set an onClickListener method.
然后，在未来，我认为这个问题将是 AndroidFileDownload 未在清单文件中声明。你应该如下添加：
And then, in the future, I think the problem will be that AndroidFileDownload is not declared in your Manifest file. You should add it as follows:
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.NautGames.xecta.app.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
// add every activity in your app like this below
<activity
android:name="com.NautGames.xecta.app.AndroidFileDownloader"
android:label="@string/app_name" />
</application>
这篇关于＆QUOT;不幸的是，...已经停止＆QUOT;在Android的下载文件时，的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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