Android setText（）不'；我有时似乎不工作。找不出原因

我正在做学校的项目。setText（）方法有时有效，有时似乎没有任何作用。找不到原因。下面是我的java类，我试图在其中设置视图的值。我可以在下面的日志语句中找到正确的值

  import android.app.Activity;
  import android.content.Intent;
  import android.os.Bundle;
  import android.util.Log;
  import android.widget.TextView;


  public class CourseDetail extends Activity{
TextView txtcourse;
TextView txtcoursetitle;
TextView txthours;
TextView txtsession;
TextView txtunits;
TextView txtconditions;
TextView txtdescription;

String course,courseTitle,hours,units,conditions,description,session;



@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.course_details);

    Intent i = getIntent();

    course = i.getStringExtra("cid");
    courseTitle = i.getStringExtra("name");
    session = i.getStringExtra("session");
    hours = i.getStringExtra("hours");
    conditions = i.getStringExtra("conditions");
    description= i.getStringExtra("description");
    units= i.getStringExtra("units");

    Log.i("Inside coursedetails","coursedetails"+course+"|"+courseTitle+"|"+session+"|"+hours+"|"+conditions+"|"+description);  

    txtcourse = (TextView) findViewById(R.id.course);
    txtcoursetitle = (TextView) findViewById(R.id.coursetitle);
    txthours = (TextView) findViewById(R.id.hours);
    txtconditions = (TextView) findViewById(R.id.conditions);
    txtsession = (TextView) findViewById(R.id.session);
    txtunits = (TextView) findViewById(R.id.units);
    txtdescription = (TextView) findViewById(R.id.description);

   txtcourse.setText(course);
   txtcoursetitle.setText(courseTitle);
   txthours.setText(hours);
   txtconditions.setText(conditions);
   txtsession.setText(session);
   txtunits.setText(units);
   txtdescription.setText(description);



}



}

xml布局

  <?xml version="1.0" encoding="utf-8"?>
  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:orientation="vertical" >

  <RelativeLayout
              android:layout_width="match_parent"
              android:layout_height="wrap_content"
              android:background="@drawable/customshape"
              android:padding="7px"
              >

        <TextView
            android:id="@+id/tab2_title"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:text="Courses"
            android:textAlignment="inherit"
            android:textColor="#FFF"
            android:textSize="20dp"
            android:textStyle="bold"

            android:gravity="center" />

          </RelativeLayout>    

     <TableLayout
    android:id="@+id/tableLayout1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >



   <TableRow
    android:id="@+id/tableRow1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="2dp"
    android:layout_marginTop="2dp"
    android:padding="5dp" >

     <TextView
         android:id="@+id/title1"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:background="#cac9c9"
         android:padding="5dp"
         android:text="Course"
         android:textColor="#040404"
         android:textSize="15dp"
         android:textStyle="bold"
         android:typeface="sans" />

     <TextView
         android:id="@+id/course"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_marginLeft="20dp"
         android:layout_marginRight="5dp"
         android:textColor="#040404"
         android:textSize="15dp"
         android:textStyle="bold"
         android:typeface="sans"
         android:layout_weight="1"
         android:layout_gravity="fill" />

   </TableRow>



   <TableRow
    android:id="@+id/tableRow2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="2dp"
    android:layout_marginTop="2dp"
    android:padding="5dp" >

    <TextView
          android:id="@+id/title2"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Course Title"
          android:textColor="#040404"
          android:textSize="15dp"
          android:textStyle="bold"
          android:typeface="sans"
          android:background="#cac9c9"
           android:padding="5dp" />

     <TextView
         android:id="@+id/coursetitle"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_marginLeft="20dp"
         android:layout_marginRight="5dp"
         android:textColor="#040404"
         android:textSize="15dp"
         android:textStyle="bold"
         android:typeface="sans"
         android:layout_weight="1"
         android:layout_gravity="fill" />

    </TableRow>

   <TableRow
    android:id="@+id/tableRow1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="2dp"
    android:layout_marginTop="2dp"
    android:padding="5dp" >

     <TextView
          android:id="@+id/title1"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Session"
          android:textColor="#040404"
          android:textSize="15dp"
          android:textStyle="bold"
          android:typeface="sans"
          android:background="#cac9c9"
           android:padding="5dp" />

     <TextView
         android:id="@+id/session"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_marginLeft="20dp"
         android:layout_marginRight="5dp"
         android:textColor="#040404"
         android:textSize="15dp"
         android:textStyle="bold"
         android:typeface="sans"
         android:layout_weight="1"
         android:layout_gravity="fill" />

   </TableRow>

  <TableRow
   android:id="@+id/tableRow2"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_marginBottom="2dp"
   android:layout_marginTop="2dp"
   android:padding="5dp" >

  <TextView
          android:id="@+id/title3"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Hours"
          android:textColor="#040404"
          android:textSize="15dp"
          android:textStyle="bold"
          android:typeface="sans"
          android:background="#cac9c9"
           android:padding="5dp" />

     <TextView
         android:id="@+id/hours"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_marginLeft="20dp"
         android:layout_marginRight="5dp"
         android:textColor="#040404"
         android:textSize="15dp"
         android:textStyle="bold"
         android:typeface="sans"
         android:layout_weight="1"
         android:layout_gravity="fill" />

 </TableRow>


 <TableRow
    android:id="@+id/tableRow3"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="2dp"
    android:layout_marginTop="2dp"
    android:padding="5dp" >

    <TextView
          android:id="@+id/title4"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Units"
          android:textColor="#040404"
          android:textSize="15dp"
          android:textStyle="bold"
          android:typeface="sans"
          android:background="#cac9c9"
           android:padding="5dp" />

     <TextView
         android:id="@+id/units"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_marginLeft="20dp"
         android:layout_marginRight="5dp"
         android:textColor="#040404"
         android:textSize="15dp"
         android:textStyle="bold"
         android:typeface="sans"
         android:layout_weight="1"
         android:layout_gravity="fill" />

   </TableRow>



   <TableRow
    android:id="@+id/tableRow4"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginBottom="2dp"
    android:layout_marginTop="2dp"
    android:padding="5dp" >

    <TextView
          android:id="@+id/title5"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text="Conditions"
          android:textColor="#040404"
          android:textSize="15dp"
          android:textStyle="bold"
          android:typeface="sans"
          android:background="#cac9c9"
           android:padding="5dp" />

     <TextView
         android:id="@+id/conditions"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_marginLeft="20dp"
         android:layout_marginRight="5dp"
         android:textColor="#040404"
         android:textSize="15dp"
         android:textStyle="bold"
         android:typeface="sans"
         android:layout_weight="1"
         android:layout_gravity="fill" />

   </TableRow>





  </TableLayout>

  <ScrollView
    android:id="@+id/scrollView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/description"
            android:layout_width="match_parent"
            android:layout_height="match_parent"

         android:layout_gravity="fill"
         android:layout_weight="1"
         android:ellipsize="end"
         android:singleLine="false"

         android:textColor="#040404"
         android:textSize="15dp"
         android:textStyle="bold"
         android:typeface="sans"
         android:padding="5dp" />

      </LinearLayout>

   </ScrollView>

  </LinearLayout>

这是日志的截图

这是详细视图的屏幕截图

有效的案例

---

试试这个方法这里是一个演示示例，您必须根据您的要求进行修改

1。activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    android:background="@android:color/darker_gray"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/tab2_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Courses"
        android:textAlignment="inherit"
        android:textColor="#FFF"
        android:textSize="20dp"
        android:textStyle="bold"
        android:background="@android:color/black"
        android:gravity="center" />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:gravity="center">
        <TextView
            android:id="@+id/title1"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:background="#cac9c9"
            android:padding="5dp"
            android:text="Course"
            android:textColor="#040404"
            android:gravity="right"
            android:textSize="15dp"
            android:textStyle="bold"
            android:typeface="sans" />

        <TextView
            android:id="@+id/course"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:padding="5dp"
            android:textColor="#040404"
            android:textSize="15dp"
            android:textStyle="bold"
            android:typeface="sans"
            android:layout_weight="1"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:gravity="center">
        <TextView
            android:id="@+id/title2"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:text="Course Title"
            android:textColor="#040404"
            android:textSize="15dp"
            android:textStyle="bold"
            android:typeface="sans"
            android:gravity="right"
            android:background="#cac9c9"
            android:padding="5dp" />

        <TextView
            android:id="@+id/coursetitle"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:padding="5dp"
            android:textColor="#040404"
            android:textSize="15dp"
            android:textStyle="bold"
            android:typeface="sans"
            android:layout_weight="1"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:gravity="center">

        <TextView
            android:id="@+id/title1"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:text="Session"
            android:textColor="#040404"
            android:textSize="15dp"
            android:textStyle="bold"
            android:typeface="sans"
            android:gravity="right"
            android:background="#cac9c9"
            android:padding="5dp" />

        <TextView
            android:id="@+id/session"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:padding="5dp"
            android:textColor="#040404"
            android:textSize="15dp"
            android:textStyle="bold"
            android:typeface="sans"
            android:layout_weight="1"/>
    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:gravity="center">

        <TextView
            android:id="@+id/title3"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:text="Hours"
            android:textColor="#040404"
            android:textSize="15dp"
            android:textStyle="bold"
            android:typeface="sans"
            android:gravity="right"
            android:background="#cac9c9"
            android:padding="5dp" />

        <TextView
            android:id="@+id/hours"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:padding="5dp"
            android:textColor="#040404"
            android:textSize="15dp"
            android:textStyle="bold"
            android:typeface="sans"
            android:layout_weight="1"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:gravity="center">

        <TextView
            android:id="@+id/title4"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:text="Units"
            android:textColor="#040404"
            android:textSize="15dp"
            android:textStyle="bold"
            android:gravity="right"
            android:typeface="sans"
            android:background="#cac9c9"
            android:padding="5dp" />

        <TextView
            android:id="@+id/units"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:padding="5dp"
            android:textColor="#040404"
            android:textSize="15dp"
            android:textStyle="bold"
            android:typeface="sans"
            android:layout_weight="1" />

    </LinearLayout>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:gravity="center">
        <TextView
            android:id="@+id/title5"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            android:text="Conditions"
            android:textColor="#040404"
            android:textSize="15dp"
            android:textStyle="bold"
            android:typeface="sans"
            android:gravity="right"
            android:background="#cac9c9"
            android:padding="5dp" />

        <TextView
            android:id="@+id/conditions"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="5dp"
            android:padding="5dp"
            android:textColor="#040404"
            android:textSize="15dp"
            android:textStyle="bold"
            android:typeface="sans"
            android:layout_weight="1"/>
    </LinearLayout>


    <ScrollView
        android:id="@+id/scrollView1"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginTop="10dp"
        android:layout_weight="1">
        <TextView
            android:id="@+id/description"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textColor="#040404"
            android:textSize="15dp"
            android:textStyle="bold"
            android:typeface="sans"
            android:padding="5dp" />
    </ScrollView>
</LinearLayout>

---

有什么错误吗？如果是这样，请显示您的日志您的屏幕截图似乎表明存在布局/格式问题，因此

setText

so，会发生什么情况？你的问题很清楚，只是想知道一些额外的细节。文本是否重置为默认值、变为空白、保持不变等。此外，它是一次性发生在所有记录上，还是仅发生在某些记录上？只发生在少数记录上。有些字段已设置，有些字段未设置。在其他一些情况下，所有内容都保持空白，但会弄乱表格布局。正如我发布的详细图片所示。这与表格布局有关吗？

public class MyActivity extends Activity {
    TextView txtcourse;
    TextView txtcoursetitle;
    TextView txthours;
    TextView txtsession;
    TextView txtunits;
    TextView txtconditions;
    TextView txtdescription;

    String course,courseTitle,hours,units,conditions,description,session;

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

        Intent i = getIntent();

        course = i.getStringExtra("cid")==null?"Demo Course":i.getStringExtra("cid");
        courseTitle = i.getStringExtra("name")==null?"Demo Name":i.getStringExtra("name");
        session = i.getStringExtra("session")==null?"Demo Session":i.getStringExtra("session");
        hours = i.getStringExtra("hours")==null?"Demo Hours":i.getStringExtra("hours");
        conditions = i.getStringExtra("conditions")==null?"Demo Conditions":i.getStringExtra("conditions");
        description= i.getStringExtra("description")==null?"Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions Demo Descriptions":i.getStringExtra("description");
        units= i.getStringExtra("units")==null?"Demo Units":i.getStringExtra("units");

        Log.i("Inside coursedetails", "coursedetails" + course + "|" + courseTitle + "|" + session + "|" + hours + "|" + conditions + "|" + description);

        txtcourse = (TextView) findViewById(R.id.course);
        txtcoursetitle = (TextView) findViewById(R.id.coursetitle);
        txthours = (TextView) findViewById(R.id.hours);
        txtconditions = (TextView) findViewById(R.id.conditions);
        txtsession = (TextView) findViewById(R.id.session);
        txtunits = (TextView) findViewById(R.id.units);
        txtdescription = (TextView) findViewById(R.id.description);

        txtcourse.setText(course);
        txtcoursetitle.setText(courseTitle);
        txthours.setText(hours);
        txtconditions.setText(conditions);
        txtsession.setText(session);
        txtunits.setText(units);
        txtdescription.setText(description);
    }
}