您好我有一个导航抽屉，它是我的MainActivity（名称为activity_main.xml的布局）和一些片段，在我的一个片段（名为PrimaryFragment）中我有一个计算器（布局名为peimary_layout.xml）的问题是当我运行应用程序并单击任何计算器按钮时，应用程序停止工作，我收到此错误：
06-09 13:17:32.634 14244-14244/com.androidbelieve.drawerwithswipetabs E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.androidbelieve.drawerwithswipetabs, PID: 14244
java.lang.IllegalStateException: Could not find method clickedBtn8(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatButton with id 'eightBtn'
at android.view.View$DeclaredOnClickListener.resolveMethod(View.java:4767)
at android.view.View$DeclaredOnClickListener.onClick(View.java:4731)
at android.view.View.performClick(View.java:5697)
at android.widget.TextView.performClick(TextView.java:10815)
at android.view.View$PerformClick.run(View.java:22526)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7229)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
这是包含计算器的片段：
public class PrimaryFragment extends Fragment {
public String str ="";
Character op = 'q';
double i,num,numtemp;
EditText showResult;
Button x2,x3;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v= inflater.inflate(R.layout.primary_layout,container,false);
x2=(Button)v.findViewById (R.id.btnX2);
x2.setText(Html.fromHtml(getResources().getString(R.string.X2)));
showResult = (EditText)v.findViewById(R.id.display);
return v;
}
public void clickedBtn1(View v){
insert("1");
}
public void clickedBtn2(View v){
insert("2");
}
public void clickedBtn3(View v){
insert("3");
}
public void clickedBtn4(View v){
insert("4");
}
public void clickedBtn5(View v){
insert("5");
}
public void clickedBtn6(View v){
insert("6");
}
public void clickedBtn7(View v){
insert("7");
}
public void clickedBtn8(View v){
insert("8");
}
public void clickedBtn9(View v){
insert("9");
}
public void clickedBtn0(View v){
insert("0");
}
public void clickedBtndot(View v){
insert(".");
}
public void clickedtan(View v){
showResult.setText("tan");
op='T';
Toast.makeText(getActivity().getApplicationContext(),"tan",Toast.LENGTH_SHORT).show();
}
public void clickedSin(View v){
showResult.setText("sin");
op='S';
Toast.makeText(getActivity().getApplicationContext(),"Sin",Toast.LENGTH_SHORT).show();
}
public void clickedCos(View v){
showResult.setText("Cos");
op='C';
// Toast.makeText(getApplicationContext(),"Cos",Toast.LENGTH_SHORT).show();
}
public void clickedSqrt(View v){
showResult.setText("√");
op='√';
//Toast.makeText(getApplicationContext(),"√",Toast.LENGTH_SHORT).show();
}
public void clickedBtnx2(View v){
perform();
op = 'X';
}
public void clickedBtnlog(View v){
op = 'L';
}
public void clickedBtnplus(View v){
perform();
op = '+';
}
public void clickedMinus(View v){
perform();
op = '-';
}
public void clickedBtnDiv(View v){
perform();
op = '/';
}
public void clickedBtnMul(View v){
perform();
op = '*';
}
public void clickedBtnequal(View v){
calculate();
}
public void clickedBtnClear(View v){
reset();
}
private void reset() {
// TODO Auto-generated method stub
str ="";
op ='q';
num = 0;
numtemp = 0;
showResult.setText("");
}
public void insert(String j) {
// TODO Auto-generated method stub
str = str+j;
num = Double.valueOf(str);
showResult.setText(str);
}
private void perform() {
// TODO Auto-generated method stub
str = "";
numtemp = num;
}
private void calculate() {
// TODO Auto-generated method stub
if(op == '+')
num = numtemp+num;
else if(op == '-')
num = numtemp-num;
else if(op == '/')
num = numtemp/num;
else if(op == '*')
num = numtemp*num;
else if(op=='C')
{
perform();
num=Math.cos(Math.toRadians(numtemp));
}
else if(op=='S')
{
perform();
num=Math.sin(Math.toRadians(numtemp));
}
else if(op=='T')
{
perform();
num=Math.tan(Math.toRadians(numtemp));
}
else if(op=='√')
{
perform();
num=Math.sqrt(numtemp);
}
else if(op=='X')
{
num=numtemp*numtemp;
}
else if(op=='L')
{
perform();
num=Math.log(numtemp);
}
// showResult.setText("Cos(" + numtemp + ")");
showResult.setText(String.valueOf(num).toString());
}
}
这是我的MainActivity
public class MainActivity extends AppCompatActivity{
DrawerLayout mDrawerLayout;
NavigationView mNavigationView;
FragmentManager mFragmentManager;
FragmentTransaction mFragmentTransaction;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/**
*Setup the DrawerLayout and NavigationView
*/
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
mNavigationView = (NavigationView) findViewById(R.id.shitstuff) ;
/**
* Lets inflate the very first fragment
* Here , we are inflating the TabFragment as the first Fragment
*/
mFragmentManager = getSupportFragmentManager();
mFragmentTransaction = mFragmentManager.beginTransaction();
mFragmentTransaction.replace(R.id.containerView,new TabFragment()).commit();
/**
* Setup click events on the Navigation View Items.
*/
mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
mDrawerLayout.closeDrawers();
if (menuItem.getItemId() == R.id.nav_item_sent) {
FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.containerView,new SentFragment()).commit();
}
if (menuItem.getItemId() == R.id.nav_item_inbox) {
FragmentTransaction xfragmentTransaction = mFragmentManager.beginTransaction();
xfragmentTransaction.replace(R.id.containerView,new TabFragment()).commit();
}
return false;
}
});
/**
* Setup Drawer Toggle of the Toolbar
*/
android.support.v7.widget.Toolbar toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.toolbar);
ActionBarDrawerToggle mDrawerToggle = new ActionBarDrawerToggle(this,mDrawerLayout, toolbar,R.string.app_name,
R.string.app_name);
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerToggle.syncState();
}
}
请帮忙，我该怎么办？
答案 0 :(得分：0)
我猜您正在设置属性android:onClick="clickedBtn8"。如果是这样，请查看此answer
您需要在活动中声明方法public void clickedBtn8(View v) {...}而不是片段。如果您想在用户单击按钮后在片段中执行某些操作，请从活动中调用片段方法，或者将onclicklistener添加到按钮，如下所示：
Button btn8 = (Button) v.findViewById(R.id.btn8); //or whatever your id is
btn8.setOnClickListener(this);
让您的片段实现View.OnClickListener并实现此方法：
public void onClick(View v) {
// do something when the button is clicked
}
答案 1 :(得分：0)
您已定义 android：onClick XML参数，但您错过了一些步骤。 在此处阅读更多相关信息：https://stackoverflow.com/a/10232111/3546306