我对此很新。我的按钮没有响应点击。我将android:onClick =“onClick”添加到xml文件中。现在我得到下面的错误。onClick错误 - Android
java.lang.IllegalStateException: Could not find a method onClick(View) in the activity class testapp.two.MainActivity for onClick handler on view class android.widget.Button with id 'buttonMinus'
请帮忙,java代码以及清单文件和主要的xml包含在下面。
谢谢。
package testapp.two;
import testapp.two.R;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity implements OnClickListener{
Button okButton, minusButton, plusButton;
TextView textScore, scoreCard;
int score = 95;
private static final String TAG = "GolfScore";
/** Called when the activity is first created. */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.d(TAG, "onCreate started");
okButton = (Button)findViewById(R.id.buttonOK);
minusButton = (Button)findViewById(R.id.buttonMinus);
plusButton = (Button)findViewById(R.id.buttonPlus);
textScore = (TextView)findViewById(R.id.textScore);
scoreCard = (TextView)findViewById(R.id.scoreCard);
//set button listeners
okButton.setOnClickListener(this);
minusButton.setOnClickListener(this);
plusButton.setOnClickListener(this);
textScore.setText(String.valueOf(score));
Log.d(TAG, "onCreate finished");
}//onCreate
@Override
public void onClick(View v) {
Log.d(TAG, "in onCreate");
switch (v.getId()){
case R.id.buttonMinus:
score--;
textScore.setText(String.valueOf(score));
break;
case R.id.buttonPlus:
score++;
textScore.setText(String.valueOf(score));
break;
case R.id.buttonOK:
break;
}//end of switch
}//end of my onclick
}//end of MainActivity
<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:onClick="@+id/buttonMinus, @+id/buttonPlus, @+id/textScore"
tools:context="${relativePackage}.${activityClass}" >
<TextView
android:id="@+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerInParent="false"
android:layout_centerVertical="false"
android:text="Golf Score App"
android:textAlignment="center" />
<LinearLayout
android:id="@+id/LinearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/title"
android:layout_marginTop="14dp"
android:baselineAligned="false"
android:gravity="fill"
android:orientation="horizontal" >
<Button
android:id="@+id/buttonMinus"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="fill"
android:layout_marginLeft="5dp"
android:clickable="true"
android:onClick="onClick"
android:layout_marginTop="0dp"
android:layout_weight="1"
android:gravity="center"
android:text="-" />
<Button
android:id="@+id/buttonPlus"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="fill"
android:layout_marginLeft="0dp"
android:clickable="true"
android:onClick="onClick"
android:layout_weight="1"
android:text="+" />
<TextView
android:id="@+id/textScore"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="fill"
android:layout_marginTop="5dp"
android:layout_weight="1"
android:gravity="center_horizontal"
android:text="92"
android:textSize="20sp" />
<Button
android:id="@+id/buttonOK"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="fill"
android:layout_marginLeft="0dp"
android:layout_marginRight="33dp"
android:clickable="true"
android:onClick="onClick"
android:layout_weight="1"
android:text="Ok"
android:textSize="15sp" />
</LinearLayout>
<TextView
android:id="@+id/scoreCard"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/LinearLayout1"
android:layout_marginTop="22dp"
android:text="Score card info goes here" />
</RelativeLayout>
我不是100%肯定的,但我认为当你在xml中使用'android:onClick =“onClick”'时,你不必在'MainActivity'中实现'onClickListener' – 0xDEADC0DE 2014-09-26 22:22:38