Question

我正在研究学校项目。 setText（）方法可以工作一段时间，而其他时候似乎没有做任何事情。无法找出原因。下面是我的java类，我试图将值设置为视图。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>

以下是日志的屏幕截图

以下是详细视图的屏幕截图

正在运作的案例

Answer 1

尝试这种方式是演示示例，你必须根据你的要求进行修改。

<强> 1。 activity_main.xml中

<?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>

<强> 2。 MyActivity

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);
    }
}

setText（）有时似乎不起作用。无法弄清楚原因

1 个答案: