Question

以下是我的代码。

MainActivity.java 代码如下：

public class Login extends AppCompatActivity {
 @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        getSupportFragmentManager().beginTransaction().replace(R.id.loginFrame, new LoginFragment()).commit();

    }
}

在 MainActivity.java

中调用的

片段活动 .java代码

  public class LoginFragment extends Fragment {
        EditText emailEt,passwordEt;
        String email,password;
        Button login,signup;
        @Nullable
        @Override
        public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            View rootview = super.onCreateView(inflater, container, savedInstanceState);

            emailEt=(EditText)rootview.findViewById(R.id.emailEt);
            passwordEt=(EditText)rootview.findViewById(R.id.passEt);
            login=(Button)rootview.findViewById(R.id.loginBtn);
            signup=(Button)rootview.findViewById(R.id.signupBtn);

            login.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    email=emailEt.getText().toString();
                    password=passwordEt.getText().toString();

                    if(email.length()==0){
                        emailEt.requestFocus();
                        emailEt.setError("FIELD CANNOT BE EMPTY");
                    }else if(password.length()==0){
                        passwordEt.requestFocus();
                        passwordEt.setError("FIELD CANNOT BE EMPTY");
                    }else{
                        Toast.makeText(getActivity(),"Validation Done",Toast.LENGTH_SHORT).show();
                        Intent in=new Intent(getActivity(),Options_class.class);
                        startActivity(in);
                    }
                }
            });

            signup.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent intent=new Intent(getActivity(),Signup.class);
                    startActivity(intent);
                }
            });
            return rootview;
        }
    }

错误 logcat 的代码显示oncreate（）mainclass中的错误

t dalvik.system.VMRuntime.newNonMovableArray（原生方法）在android.graphics.BitmapFactory.nativeDecodeAsset（本机方法）在android.graphics.BitmapFactory.decodeStream（BitmapFactory.java:620）在 android.graphics.BitmapFactory.decodeResourceStream（BitmapFactory.java:455）在 android.graphics.drawable.Drawable.createFromResourceStream（Drawable.java:1152）在 android.content.res.ResourcesImpl.loadDrawableForCookie（ResourcesImpl.java:724）在 android.content.res.ResourcesImpl.loadDrawable（ResourcesImpl.java:575）在android.content.res.Resources.loadDrawable（Resources.java:854）在android.content.res.TypedArray.getDrawable（TypedArray.java:928）在android.widget.ImageView。（ImageView.java:167）在android.widget.ImageView。（ImageView.java:155）在 android.support.v7.widget.AppCompatImageView。（AppCompatImageView.java:60）在 android.support.v7.widget.AppCompatImageView。（AppCompatImageView.java:56）在 android.support.v7.app.AppCompatViewInflater.createView（AppCompatViewInflater.java:106）在 android.support.v7.app.AppCompatDelegateImplV9.createView（AppCompatDelegateImplV9.java:1021）在 android.support.v7.app.AppCompatDelegateImplV9.onCreateView（AppCompatDelegateImplV9.java:1080）在 android.support.v4.view.LayoutInflaterCompatHC $ FactoryWrapperHC.onCreateView（LayoutInflaterCompatHC.java:47）在 android.view.LayoutInflater.createViewFromTag（LayoutInflater.java:769）在 android.view.LayoutInflater.createViewFromTag（LayoutInflater.java:727）在android.view.LayoutInflater.rInflate（LayoutInflater.java:858）在 android.view.LayoutInflater.rInflateChildren（LayoutInflater.java:821）在android.view.LayoutInflater.inflate（LayoutInflater.java:518）在android.view.LayoutInflater.inflate（LayoutInflater.java:426）在android.view.LayoutInflater.inflate（LayoutInflater.java:377）在 android.support.v7.app.AppCompatDelegateImplV9.setContentView（AppCompatDelegateImplV9.java:288）在 android.support.v7.app.AppCompatActivity.setContentView（AppCompatActivity.java:140）在com.example.nirmit.demo_frg.Login.onCreate（Login.java:13）在android.app.Activity.performCreate（Activity.java:6672）在 android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1140）在 android.app.ActivityThread.performLaunchActivity（ActivityThread.java:2612）在 android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:2724）在android.app.ActivityThread.-wrap12（ActivityThread.java）在 android.app.ActivityThread $ H.handleMessage（ActivityThread.java:1473）在android.os.Handler.dispatchMessage（Handler.java:102）在android.os.Looper.loop（Looper.java:154）在android.app.ActivityThread.main（ActivityThread.java:6123） at java.lang.reflect.Method.invoke（Native Method）在 com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run（ZygoteInit.java:867）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:757）

任何正文都可以帮我解决mainActivity和片段代码中的logcat问题。

Answer 1

修改此行

View rootview = super.onCreateView(inflater, container, savedInstanceState);

进入这个

   View rootview = inflater.inflate(R.layout.fragmentlayout, container, false);

Answer 2

 public class Login extends AppCompatActivity {
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_login);

            Bundle bundle = new Bundle();
            fragment = new LoginFragment();
            fragment.setArguments(bundle);

            if (fragment != null) {
                FragmentManager fragmentManager = getSupportFragmentManager();
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.replace(R.id.loginFrame, fragment);
                fragmentTransaction.commit();
                //initToolbar();
            }


        }
    }

和

public class LoginFragment extends Fragment {
    View rootview;

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        rootview = inflater.inflate(your_layout, null);


        return rootview;
    }
}

如何解决碎片错误

2 个答案: