如何添加一个textview和一个edittext一旦我点击一个按钮？

Question

我想问如何添加一个textview和一个edittext一旦我点击一个按钮？我的按钮，添加一个TextView和EditText上是 “按钮addStaff”

这里是我的代码：

_12_EventAssign.java

public class _12_EventAssign extends AppCompatActivity { 

LinearLayout linearL; 
TextView tvdept1; 
EditText etdept1; 
TextView tvheadofdept1; 
EditText etheadofdept1; 
View lineview; 


Button addStaff; 
LinearLayout staff; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity__12__event_assign); 

    getSupportActionBar().setTitle("Add Event: Information"); 

    getSupportActionBar().setDisplayHomeAsUpEnabled(true); 

    linearL = (LinearLayout)findViewById(R.id.ev_assign_linearlay); 
    tvdept1 = (TextView)findViewById(R.id.textv_dept1); 
    etdept1 = (EditText)findViewById(R.id.editT_dept1); 
    tvheadofdept1 = (TextView)findViewById(R.id.textv_headofdept1); 
    etheadofdept1 = (EditText)findViewById(R.id.editT_headofdept1); 
    lineview = findViewById(R.id.view1); 

    // staff = (LinearLayout)findViewById(R.id.add_staff); 


    addStaff = (Button)findViewById(R.id.btnaddstaff); 
    addStaff.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      linearL.addView(tvdept1); 
     } 
    }); 
} 
} 

这里是我的xml文件

activity__12__event_assign.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
xmlns:tools="http://schemas.android.com/tools" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
tools:context="com.ortegapatriciaa.enventer._12_EventAssign" 
android:background="@color/colorWhite" 
> 


<ScrollView 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 

    <LinearLayout 
     android:id="@+id/ev_assign_linearlay" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:orientation="vertical"> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:orientation="vertical" 
      android:id="@+id/add_staff"> 

      <TextView 
       android:id="@+id/textv_dept1" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:layout_marginLeft="20dp" 
       android:layout_marginTop="25dp" 
       android:text="Department" 
       android:textColor="@color/colorBlack" 
       android:textSize="23dp" /> 

      <EditText 
       android:id="@+id/editT_dept1" 
       android:layout_width="300dp" 
       android:layout_height="40dp" 
       android:layout_marginLeft="35dp" 
       android:layout_marginTop="7dp" 
       android:background="@color/colorGray" 
       android:ems="10" 
       android:inputType="textPersonName" /> 

      <TextView 
       android:id="@+id/textv_headofdept1" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:layout_marginLeft="20dp" 
       android:layout_marginTop="10dp" 
       android:text="Head of the Department" 
       android:textColor="@color/colorBlack" 
       android:textSize="23dp" /> 

      <EditText 
       android:id="@+id/editT_headofdept1" 
       android:layout_width="300dp" 
       android:layout_height="40dp" 
       android:layout_marginLeft="35dp" 
       android:layout_marginTop="7dp" 
       android:background="@color/colorGray" 
       android:ems="10" 
       android:inputType="textPersonName" /> 

      <View 
       android:id="@+id/view1" 
       android:layout_width="330dp" 
       android:layout_height="1dip" 
       android:layout_marginLeft="15dp" 
       android:layout_marginTop="20dp" 
       android:background="@color/colorBlack" /> 

     </LinearLayout> 

     <Button 
      android:id="@+id/btnaddstaff" 
      android:layout_width="130dp" 
      android:layout_height="45dp" 
      android:text="Add Staff" 
      android:textStyle="bold" 
      android:textAllCaps="false" 
      android:layout_marginLeft="10dp" 
      android:layout_marginRight="20dp" 
      android:layout_weight="1" 
      android:height="60dp" 
      android:background="@color/colorWhite" 
      android:drawablePadding="6dp" 
      android:drawableLeft="@drawable/ic_person_add_black_24dp" 
      android:gravity="left|center" 
      android:padding="6dp" 
      android:textColor="#000" 
      android:textSize="18dp" 
      android:layout_marginTop="5dp" 
      /> 

     <Button 
      android:id="@+id/btnsave" 
      android:layout_width="250dp" 
      android:layout_height="40dp" 
      android:text="Save" 
      android:textAllCaps="false" 
      android:textSize="22dp" 
      android:background="@color/buttonColor" 
      android:layout_gravity="center" 
      android:layout_marginTop="20dp" 
      android:layout_marginBottom="10dp" 
      /> 


    </LinearLayout> 
</ScrollView> 

我希望你能帮助我。谢谢！

Answer 1

您不能将现有视图添加到布局。您必须创建新的TextView并添加：

addStaff.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      TextView tv = new TextView(getApplicationContext()); 
      tv.setBackgroundColor(Color.GRAY); 
      LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 100); 
      linearL.addView(tv, params); 
     } 
    }); 

Answer 2

尝试这种方式

addStaff = (Button)findViewById(R.id.btnaddstaff); 
    addStaff.setOnClickListener(new View.OnClickListener() { 
    @Override 
    public void onClick(View v) { 
     TextView tv = new TextView(this) 
     tv.setText("yourtext") 
     EditText et = new Edittext(this) 
     et.setText("yourtext") 
     linearL.addView(tv); 
     linearL.addView(et); 

    } 
}); 

Answer 3

这完美的作品...

您可以更改lparams根据您的需要

LinearLayout linearLayout =(LinearLayout)findViewById(R.id.yourLinearLayoutID); 
Button yourButton = (Button)findViewById(R.id.yourButtonID); 

yourButtonID.setOnClickListener(new View.OnClickListener() { 
    @Override 
    public void onClick(View v) { 

    LayoutParams layoutparam = new LayoutParams(
     LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 

    TextView textview=new TextView(this); 
    textview.setLayoutParams(lparams);  
    textview.setText("Your Text Here");  //For TextView 
    this.linearLayout.addView(textView); 

    EditText editText=new EditText(this); 
    editText.setLayoutParams(lparams); 
    editText.setText("Your Text Here"); //For EditText 
    this.linearLayout.addView(editText); 
} 
});