Question

My Fragment.java

    package make.appaplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

    public class Fragment41 extends AppCompatActivity {

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.fragment_41);
            TextView textViewDisplayResult = (TextView) findViewById(R.id.text_view_display_result);

            textViewDisplayResult.setText(getIntent().getBooleanExtra("KEY_ANSWER", false)?R.string.Good_answer:R.string.Wrong_answer);
        }
    }

在MainActivity中

fragmentList.add(new Fragment41());

抛出add(android.support.v4.app.Fragment) in List can not be applied to (make.application.Fragment)

我添加了compile 'com.android.support:support-v4:25.1.1'并重建，但一切都没有改变。

更新了Lalit用户的代码。（我现在得到三种方法Can not resolve并加下划线protected）

    package make.appaplication;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.widget.TextView;

public class Fragment41 extends android.support.v4.app.Fragment{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_41);
        TextView textViewDisplayResult = (TextView) findViewById(R.id.text_view_display_result);

        textViewDisplayResult.setText(getIntent().getBooleanExtra("KEY_ANSWER", false)?R.string.Good_answer:R.string.Wrong_answer);
    }
}

Answer 1

替换

中的代码

public class MyFragment extends Fragment{
}

与

public class MyFragment extends android.support.v4.app.Fragment{
}

并更改导入

import android.app.Fragment;

到

import android.support.v4.app.Fragment;

无法解决列表中的add（android.support.v4.app.Fragment）无法应用于（make.application.Fragment）

1 个答案: