如何更改此片段

我有这个片段1，我想从另一个片段的Java在这里。问题是，我导入的java来自MainActivity.java，如果我复制它，它似乎不工作。我已经导入字符串和XML它，只需要知道如何正确获取的Java到这一个：如何更改此片段

当前片段

import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 

public class ConnectFragment extends Fragment { 

public ConnectFragment() { 
} 

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

    View rootView = inflater.inflate(R.layout.fragment_connect, container, false); 

    return rootView; 
} 

}

的Java，我想导入：

import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
import android.widget.TextView; 


public class MainActivity extends AppCompatActivity { 

public String sign = ""; 
public String total= ""; 
public Double tempDouble, tempDouble2; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    // Buttons for Felony 
    Button button1 =(Button)findViewById(R.id.button1); 
    Button button2 =(Button)findViewById(R.id.button2); 
    Button button3 =(Button)findViewById(R.id.button3); 
    Button button4 =(Button)findViewById(R.id.button4); 
    Button button5 =(Button)findViewById(R.id.button5); 
    //Buttons for misdemeanors 
    Button button6 =(Button)findViewById(R.id.button7); 
    Button button7 =(Button)findViewById(R.id.button8); 
    Button button8 =(Button)findViewById(R.id.button6); 
    //Buttons for Infraction 
    Button button9 =(Button)findViewById(R.id.button9); 
    //clear, +, = 
    Button button10=(Button)findViewById(R.id.button10); 
    Button button11 =(Button)findViewById(R.id.button11); 
    Button button12 =(Button)findViewById(R.id.button12); 




    // button 1 event handler 
    button1.setOnClickListener(
      //button 1 interface 
      new Button.OnClickListener() 
      { 
       //Button 1 callback method 
       public void onClick(View v) 
       { 
        TextView output = (TextView)findViewById(R.id.editText); 
        output.append("100 years"); 
       } 
      } 
    ); 
    // button 2 event handler 
    button2.setOnClickListener(
      //button 2 interface 
      new Button.OnClickListener() 
      { 
       //Button 2 callback method 
       public void onClick(View v) 
       { 
        TextView output = (TextView)findViewById(R.id.editText); 
        output.append("25 years"); 
       } 
      } 
    ); 
    // button 3 event handler 
    button3.setOnClickListener(
      //button 3 interface 
      new Button.OnClickListener() 
      { 
       //Button 3 callback method 
       public void onClick(View v) 
       { 
        TextView output = (TextView)findViewById(R.id.editText); 
        output.append("10 years"); 
       } 
      } 
    ); 
    // button 4 event handler 
    button4.setOnClickListener(
      //button 4 interface 
      new Button.OnClickListener() 
      { 
       //Button 4 callback method 
       public void onClick(View v) 
       { 
        TextView output = (TextView)findViewById(R.id.editText); 
        output.append("5 years"); 
       } 
      } 
    ); 
    // button 5 event handler 
    button5.setOnClickListener(
      //button 5 interface 
      new Button.OnClickListener() 
      { 
       //Button 5 callback method 
       public void onClick(View v) 
       { 
        TextView output = (TextView)findViewById(R.id.editText); 
        output.append("1 years"); 
       } 
      } 
    ); 
    // button 6 event handler 
    button6.setOnClickListener(
      //button 1 interface 
      new Button.OnClickListener() 
      { 
       //Button 6 callback method 
       public void onClick(View v) 
       { 
        TextView output = (TextView)findViewById(R.id.editText); 
        output.append("1 years"); 
       } 
      } 
    ); 
    // button 7 event handler 
    button7.setOnClickListener(
      //button 7 interface 
      new Button.OnClickListener() 
      { 
       //Button 7 callback method 
       public void onClick(View v) 
       { 
        TextView output = (TextView)findViewById(R.id.editText); 
        output.append("0.5 years"); 
       } 
      } 
    ); 
    // button 8 event handler 
    button8.setOnClickListener(
      //button 8 interface 
      new Button.OnClickListener() 
      { 
       //Button 8 callback method 
       public void onClick(View v) 
       { 
        TextView output = (TextView)findViewById(R.id.editText); 
        output.append("0.25 years"); 
       } 
      } 
    ); 
    // button 9 event handler 
    button9.setOnClickListener(
      //button 9 interface 
      new Button.OnClickListener() 
      { 
       //Button 9 callback method 
       public void onClick(View v) 
       { 
        TextView output = (TextView)findViewById(R.id.editText); 
        output.append("0.013 years"); 
       } 
      } 
    ); 
    // button 10 event handler 
    button10.setOnClickListener(
      //button 10 interface 
      new Button.OnClickListener() 
      { 
       //Button 10 callback method 
       public void onClick(View v) 
       { 
        TextView output = (TextView)findViewById(R.id.editText); 
        output.setText(""); 
       } 
      } 
    ); 
    // button 12 event handler 
    button12.setOnClickListener(
      //button 12 interface 
      new Button.OnClickListener() 
      { 
       //Button 12 callback method 
       public void onClick(View v) 
       { 
        TextView output = (TextView)findViewById(R.id.editText); 
        tempDouble = Double.parseDouble(output.getText().toString()); 
        output.setText(""); 
        sign = "+"; 
       } 
      } 
    ); 

    // button 11 event handler 
    button11.setOnClickListener(
      //button 11 interface 
      new Button.OnClickListener() 
      { 
       //Button 11 callback method 
       public void onClick(View v) 
       { 
        TextView output = (TextView)findViewById(R.id.editText); 
        tempDouble2 = Double.parseDouble(output.getText().toString()); 
        if (sign=="+") 
        { 
         output.setText(Double.toString(tempDouble+tempDouble2)); 
         sign=""; 
        } 
       } 
      } 
    ); 
} 
}

来源

2016-03-28 Tyrese Benson

好。有什么问题？我看到一个空的片段和你的活动代码。您将代码放入oncreate视图。唯一的规定是你需要，膨胀正确的布局，并使用rootview.findview ... – StarWind0

看看http://www.vogella.com/tutorials/AndroidFragments/article.html – StarWind0

由于您需要执行rootView.findViewById（R.id.the_item_id）以获取对所有UI组件的引用，因此您的代码已崩溃。

见Fragment API Docs

@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

    View rootView = inflater.inflate(R.layout.fragment_connect, container, false); 
    Button aButton = (Button) rootView.findViewById(R.id.button_id); 

    return rootView; 
}

这将帮助你

来源

2016-03-28 02:17:36

如何更改此片段

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