Question

所以今天我创建了标签视图栏和片段，并在其中一个片段中添加了一些图像按钮。当我在按钮代码上添加android:onClick="name"并在.java文件中写入Intent时，当我点击该按钮时，它会给我强制关闭错误。

这是我的代码：

fragment.xml之

<ImageButton
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/btnProgramiPL5x5"
            android:minHeight="80dp"
            android:background="@mipmap/btn_programi_pl_5x5"
            android:onClick="ProgramiPowerlifting5x5"/>

fragment.java

   package hr.app.liftme.liftmehr;


import android.content.Intent;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;


/**
 * A simple {@link Fragment} subclass.
 */
public class FragmentPowerlifting extends Fragment {



    public FragmentPowerlifting() {
        // Required empty public constructor
    }




    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_powerlifting, container, false);


    }

ProgramiPowerlifting5x5.java

    package hr.app.liftme.liftmehr;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;

public class ProgramiPowerlifting5x5 extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_programi_powerlifting5x5);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        Intent intent = getIntent();
    }

}

我得到的错误是：

01-26 23:00:44.766 14491-14491/hr.app.liftme.liftmehr E/AndroidRuntime: FATAL EXCEPTION: main
                                                                        Process: hr.app.liftme.liftmehr, PID: 14491
                                                                        java.lang.IllegalStateException: Could not find method ProgramiPowerlifting5x5(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatImageButton with id 'btnProgramiPL5x5'
                                                                            at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.resolveMethod(AppCompatViewInflater.java:307)
                                                                            at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:266)
                                                                            at android.view.View.performClick(View.java:4856)
                                                                            at android.view.View$PerformClick.run(View.java:19956)
                                                                            at android.os.Handler.handleCallback(Handler.java:739)
                                                                            at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                            at android.os.Looper.loop(Looper.java:211)
                                                                            at android.app.ActivityThread.main(ActivityThread.java:5389)
                                                                            at java.lang.reflect.Method.invoke(Native Method)
                                                                            at java.lang.reflect.Method.invoke(Method.java:372)
                                                                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
                                                                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)

当我链接我使用this, name.class的两项活动时，我不知道问题是什么，但在这种情况下没有用，所以我使用了getActivity它仍然不起作用。

我真的很感激帮助！

谢谢！

Answer 1

这里的问题是：

无法在父级或祖先语境中找到方法ProgramiPowerlifting5x5（View）

onClick属性引用父Context（作为父Activity），因此片段的方法不会被触发，也不会被此属性处理。
您必须处理活动中的点击：

public class ProgramiPowerlifting5x5 extends AppCompatActivity {
    ...
    // change the method's name to avoid confusion with constuctor
    public void ProgramiPowerLifting(View view){
        Intent intent = new Intent(this, ProgramiPowerlifting5x5.class);
        startActivity(intent);
    }
}

或者在你的片段中触发相同的方法：

public class ProgramiPowerlifting5x5 extends AppCompatActivity {
    private ProgramPowerFragment fragment;
    ...
    public void ProgramiPowerLifting(View view){
        fragment.ProgramiPowerLifting(view);
    }
}

This great answer使用一个回调界面，我个人建议。或者您可以轻松忘记onClick xml属性，并使用setOnClickListener()动态执行此操作所以，让我们试试这个简单的方法：

public class FragmentPowerlifting extends Fragment {

    public FragmentPowerlifting() { }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
        // store the layout in a view variable
        View v = inflater.inflate(R.layout.fragment_powerlifting, container, false);
        // use this view ("v") to retrieve elements on the layout by its id
        ImageButton imgButton = (ImageButton) v.findViewById(R.id.btnProgramiPL5x5);
        // set a listener to the button
        imgButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                // open a new activity when onClick is triggered
                Intent intent = new Intent(getActivity(), ProgramiPowerLiftingActivity.class);
                startActivity(intent);
            }
        }
        // return the inflated view to display it
        return v;
   }
}

从碎片强制关闭错误打开活动

1 个答案: