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[英]how to make scrollable horizontally and vertically the contents of a TextView
[英]Make textview vertically scrollable
如何使多個textview在屏幕的某些不同部分中垂直滾動?
<ImageView android:id="@+id/imageView" android:layout_width="200dp" android:layout_height="200dp" android:src="@drawable/girl1" /> <TextView android:layout_width="200dp" android:layout_height="200dp" android:id="@+id/textview" android:maxLines="8" android:scrollbars="vertical" android:layout_alignTop="@+id/imageView" android:layout_toEndOf="@+id/imageView" android:layout_toRightOf="@+id/imageView"></TextView> </RelativeLayout> TextView intro; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_meet_our_team); TextView txtview=(TextView)findViewById(R.id.textview); String text="I like programming in Android. This tip shows you how to make a TextView scrollable in Android."; txtview.setText(text); intro.setMovementMethod(new ScrollingMovementMethod()); } }
我收到以下錯誤:
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setMovementMethod(android.text.method.MovementMethod)' on a null object reference
at com.example.cepl_pc.trial.MeetOurTeam.onCreate
您的問題在於intro.setMovementMethod(new ScrollingMovementMethod());
您尚未為TextView簡介分配任何ID,請用txtView替換它。 另外,您有android:maxLines = "8"
並且您的文本字符串不夠長,無法獲得滾動視圖,請使用下面的代碼查看滾動效果。
<ImageView
android:id="@+id/imageView"
android:layout_width="200dp"
android:layout_height="200dp"
android:src="@drawable/girl1" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/textview"
android:maxLines = "3"
android:scrollbars="vertical"
android:layout_alignTop="@+id/imageView"
android:layout_toEndOf="@+id/imageView"
android:layout_toRightOf="@+id/imageView"></TextView>
在Java中,
TextView txtview=(TextView)findViewById(R.id.textview);
String text="I like programming in Android. This tip shows you how to make a TextView scrollable in Android.";
txtview.setText(text);
txtview.setMovementMethod(new ScrollingMovementMethod());
你甚至可以
<ScrollView
android:layout_width="200dp"
android:layout_height="200dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="text"/>
</ScrollView>
如果您想讓所有布局都滾動,請將ScrollView設置為根布局,並將fillview端口設置為true,如下所示:
<Scroll View
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fillViewport="true"/>
.
.
//rest of your xml code.
.
.
<ScrollView/>
如果可行,請在評論部分讓我知道。
解決該問題的最佳方法是將其包含在.xml文件的ScrollView
中,如下所示。
<ScrollView
android:id="@+id/scrollView"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/imageView"
android:layout_width="200dp"
android:layout_height="200dp"
android:src="@drawable/girl1" />
<TextView
android:layout_width="200dp"
android:layout_height="200dp"
android:id="@+id/textview"
android:maxLines="8"
android:scrollbars="vertical"
android:layout_alignTop="@+id/imageView"
android:layout_toEndOf="@+id/imageView"
android:layout_toRightOf="@+id/imageView"></TextView>
</ScrollView>
聲明textView
textView1 = (TextView) findViewById(R.id.textView1);
在方法中添加以下代碼
textView1.setMovementMethod(new ScrollingMovementMethod());
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