问题
I am building an app named Ping in Android Studio. So far my activities are LoginActivity ProfileActivity and Timeline. My issue is that a button in the layout corresponding to the Timeline activity has an onClick method that isn't working. When the button is clicked, the emulator gives the "Unfortunatley, Ping has stopped." I'm defining the buttons and onClick methods the same way I have for other buttons whose functions are working, just this one does not seem to work. I'm receiving an error saying the method can't be found, but I've written the method in the corresponding activity. Here is the logcat:
04-30 10:40:08.727 2075-2075/com.ping_social.www.ping E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.ping_social.www.ping, PID: 2075
java.lang.IllegalStateException: Could not find a method onProfilePress(View) in the activity class android.view.ContextThemeWrapper for onClick handler on view class android.widget.Button with id 'profileButton'
at android.view.View$1.onClick(View.java:4007)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NoSuchMethodException: onProfilePress [class android.view.View]
at java.lang.Class.getMethod(Class.java:664)
at java.lang.Class.getMethod(Class.java:643)
at android.view.View$1.onClick(View.java:4000)
at android.view.View.performClick(View.java:4780)
at android.view.View$PerformClick.run(View.java:19866)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5257)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Here is my Timeline activity class:
package com.ping_social.www.ping;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
public class TimeLine extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_time_line);
/*print log that shows we've got here*/
Log.i("LoginActivity", "Layout has been set");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_time_line, 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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/*called when user presses the Log in button*/
public void onProfilePress(View view){
/*Log the button press*/
Log.i("TimeLine", "Has reached the onProfilePress method");
Intent intent = new Intent(this, ProfileActivity.class);
startActivity(intent);
}
}
And here is my Timeline layout xml code:
<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"
android:theme="@style/GeneralTheme"
tools:context="com.ping_social.www.ping.TimeLine">
<TextView android:text="@string/no_pings" android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30sp"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"
android:textIsSelectable="false"
android:textColor="@color/PING_TOP_BAR_RED"
android:id="@+id/textView4" />
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="60dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/timeline_button"
android:id="@+id/timelineButton"
android:textColor="@color/PING_TOP_BAR_RED"
android:layout_weight="1"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/new_ping_button"
android:id="@+id/newPingButton"
android:layout_weight="1"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/activity_button"
android:id="@+id/activityButton"
android:layout_weight="1"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/profile_button"
android:id="@+id/profileButton"
android:layout_weight="1"
android:onClick="onProfilePress"/>
</LinearLayout>
</RelativeLayout>
I'm pretty positive there are not spelling issues, and there are also no other buttons that share the same ID or methods that share the same name. Been stuck on this for a few days, any help is very much appreciated!
回答1:
Ok, so I made my own test. I've put together a basic relative layout with a single button, put android:theme="@style/AppTheme" in it, and a button - app crashed with the same error. Then I removed android:theme attribute - onclick event fired as it should.
All the same happened when I used AppCompatActivity instead of now-deprecated ActionBarActivity.
It's hard for me to say why it doesn't work with android:theme. It's one of Lollipop's features, but I tried to launch in on API 5.0 emulator. The article states that currently this attribute is only supported for android.support.v7.widget.Toolbar.
来源：https://stackoverflow.com/questions/29974482/java-lang-illegalstateexception-cannot-find-buttons-onclick-method-in-android