我正在创建一个应用程序，用户必须下载文件才能使应用程序正常运行。 我添加了一个名为“HTTPTest”的新类，它下载了该文件。当我点击按钮下载文件时，它说“不幸的是......已经停止了。”。
首先，继承日志：
Process: com.NautGames.xecta.app, PID: 2759
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 'Button01'
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.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$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
继承HTTPTest类：
package com.NautGames.xecta.app;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.net.URLConnection;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class HTTPTest extends Activity {
String Path = Environment.getExternalStorageDirectory().getPath() + "/Download";
String dwnload_file_path = "https://fbcdn-profile-a.akamaihd.net/hprofile-ak-snc6/187259_10000060421658402_744490318028_q.jpg";
String dest_file_path = Path;
Button b1;
ProgressDialog dialog = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
b1 = (Button)findViewById(R.id.Button01);
b1.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
dialog = ProgressDialog.show(HTTPTest.this, "", "Downloading file...", true);
new Thread(new Runnable() {
public void run() {
downloadFile(dwnload_file_path, dest_file_path);
}
}).start();
}
});
}
public void downloadFile(String url, String dest_file_path) {
try {
File dest_file = new File(dest_file_path);
URL u = new URL(url);
URLConnection conn = u.openConnection();
int contentLength = conn.getContentLength();
DataInputStream stream = new DataInputStream(u.openStream());
byte[] buffer = new byte[contentLength];
stream.readFully(buffer);
stream.close();
DataOutputStream fos = new DataOutputStream(new FileOutputStream(dest_file));
fos.write(buffer);
fos.flush();
fos.close();
hideProgressIndicator();
} catch(FileNotFoundException e) {
hideProgressIndicator();
return;
} catch (IOException e) {
hideProgressIndicator();
return;
}
}
void hideProgressIndicator(){
runOnUiThread(new Runnable() {
public void run() {
dialog.dismiss();
}
});
}
}
activity_main.xml中：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context="com.NautGames.chatbot.app.MainActivity"
android:background="@drawable/oneiric640x960">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/editText1"
android:hint="Talk to Xecta"
android:layout_below="@+id/view"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Send"
android:id="@+id/button1"
android:layout_centerHorizontal="true"
android:layout_below="@+id/editText1"
android:onClick="buttonOnClick" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="File Download Demo from Coderzheaven \n\nFile to download : http://coderzheaven.com/sample_folder/sample_file.png \n\nSaved Path : sdcard/\n"
android:id="@+id/textView"
android:layout_below="@+id/button1"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginTop="31dp" />
<Button
android:text="Download File"
android:id="@+id/Button01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView"
android:layout_centerHorizontal="true"
android:onClick="onClick">
</Button>
</RelativeLayout>
MainActivity.java
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);
}
@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);
}
}
请告诉我如何解决这个问题，谢谢。