Android TextView for scrolling display effects
Last Update:2016-03-18
Source: Internet
Author: User
<span id="Label3"></p><p><p>In android, if you set the TextView control to be a single-line display, and the text that is displayed is too long, the default is to cause the display to be incomplete, in which case we need to set the control property as Follows:</p></p><pre> <span style="color: #0000ff;"><span style="color: #0000ff;"><</span></span><span style="color: #800000;"><span style="color: #800000;">TextView</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:id</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "@+id/tv1"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:layout_width</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "wrap_content"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:layout_height</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "wrap_content"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:singleline</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "true"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">android:ellipsize</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "marquee"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">android:focusable</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "true"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:focusableintouchmode</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "true"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:text</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "@string/hello_world"</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">/></span></span></pre>Note that the above 3 properties of the red, according to the above setting these 3 properties, this textview space will scroll to display the text content, to ensure the full display of Text. however, The above method only applies to only 1 TextView in the interface, when there are multiple TextView in one interface set the same property, and only one control will scroll to display, the other TextView controls will not Scroll. The reason for this is that the TextView space must have the focus when scrolling, but by default, only one textview space gets the focus, so this is the Case. The workaround is simple, overriding the method isFocused () of the class textview, so that it always returns true, which is always the selected state, so that multiple TextView controls have the effect of scrolling. The first is the class that inherits Textview:<pre><span style="color: #0000ff;"><span style="color: #0000ff;"></span> package</span><span style="color: #000000;"><span style="color: #000000;">com.example.administrator.test_hello_world;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">android.content.Context;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">android.util.AttributeSet;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">android.widget.TextView;</span></span><span style="color: #008000;"><span style="color: #008000;">/**</span></span><span style="color: #008000;"><span style="color: #008000;">* Created by Administrator on 2016/3/17. * Achieve the TextView of the marquee effect</span></span><span style="color: #008000;"><span style="color: #008000;">*/</span></span><span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span> <span style="color: #0000ff;"><span style="color: #0000ff;">class</span></span>MarqueeText<span style="color: #0000ff;"><span style="color: #0000ff;">extends</span></span><span style="color: #000000;"><span style="color: #000000;">TextView {</span></span><span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span><span style="color: #000000;"><span style="color: #000000;">MarqueeText (context Context) {</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Super</span></span><span style="color: #000000;"><span style="color: #000000;">(context); } </span></span><span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span><span style="color: #000000;"><span style="color: #000000;">marqueetext (context context, attributeset attrs) {</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Super</span></span><span style="color: #000000;"><span style="color: #000000;">(context, attrs); } </span></span><span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span>MarqueeText (context context, AttributeSet attrs,<span style="color: #0000ff;"><span style="color: #0000ff;">int</span></span><span style="color: #000000;"><span style="color: #000000;">Defstyleattr) { </span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Super</span></span><span style="color: #000000;"><span style="color: #000000;">(context, attrs, defstyleattr); } </span></span><span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">returns whether the TextView is in the selected state</span></span><span style="color: #008000;"><span style="color: #008000;">//</span></span><span style="color: #008000;"><span style="color: #008000;">and only the selected TextView can achieve the marquee effect</span></span><span style="color: #000000;"><span style="color: #000000;">@Override</span></span><span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span> <span style="color: #0000ff;"><span style="color: #0000ff;">Boolean</span></span><span style="color: #000000;"><span style="color: #000000;">isFocused () {</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">return</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">true</span></span><span style="color: #000000;"><span style="color: #000000;">; }}</span></span></pre>Next is the layout file: activity_main.xml<pre><span style="color: #0000ff;"><span style="color: #0000ff;"><?</span></span><span style="color: #ff00ff;"><span style="color: #ff00ff;">XML version= "1.0" encoding= "utf-8"</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">?></span></span><span style="color: #0000ff;"><span style="color: #0000ff;"><</span></span><span style="color: #800000;"><span style="color: #800000;">LinearLayout</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">xmlns:android</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "http://schemas.android.com/apk/res/android"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Xmlns:tools</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "http://schemas.android.com/tools"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:layout_width</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "match_parent"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:layout_height</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "match_parent"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">android:orientation</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "vertical"</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">></span></span> <span style="color: #008000;"><span style="color: #008000;"><!--</span></span><span style="color: #008000;"><span style="color: #008000;">Singleline can only be single-line display</span></span><span style="color: #008000;"><span style="color: #008000;"></span> -</span> <span style="color: #0000ff;"><span style="color: #0000ff;"><</span></span><span style="color: #800000;"><span style="color: #800000;">Com.example.administrator.test_hello_world.marqueeText</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:id</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "@+id/tv1"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:layout_width</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "wrap_content"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:layout_height</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "wrap_content"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:singleline</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "true"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">android:ellipsize</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "marquee"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">android:focusable</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "true"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:focusableintouchmode</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "true"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:text</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "@string/hello_world"</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">/></span></span> <span style="color: #0000ff;"><span style="color: #0000ff;"><</span></span><span style="color: #800000;"><span style="color: #800000;">Com.example.administrator.test_hello_world.marqueeText</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:id</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "@+id/tv2"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:layout_width</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "wrap_content"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:layout_height</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "wrap_content"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:layout_margintop</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "10dp"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:singleline</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "true"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">android:ellipsize</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "marquee"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">android:focusable</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "true"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:focusableintouchmode</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "true"</span></span><span style="color: #ff0000;"><span style="color: #ff0000;">Android:text</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">= "@string/hello_world"</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">/></span></span><span style="color: #0000ff;"><span style="color: #0000ff;"></</span></span><span style="color: #800000;"><span style="color: #800000;">LinearLayout</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">></span></span></pre>and finally the Activity:MainActivity.java.<pre><span style="color: #0000ff;"><span style="color: #0000ff;"></span> package</span><span style="color: #000000;"><span style="color: #000000;">com.example.administrator.test_hello_world;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">android.app.Activity;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">android.os.Bundle;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">android.view.View;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Import</span></span><span style="color: #000000;"><span style="color: #000000;">android.widget.Button;</span></span><span style="color: #0000ff;"><span style="color: #0000ff;"></span> public</span> <span style="color: #0000ff;"><span style="color: #0000ff;">class</span></span>Mainactivity<span style="color: #0000ff;"><span style="color: #0000ff;">extends</span></span><span style="color: #000000;"><span style="color: #000000;">Activity {</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">void</span></span><span style="color: #000000;"><span style="color: #000000;">init_view () {} @Override</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">protected</span></span> <span style="color: #0000ff;"><span style="color: #0000ff;">void</span></span><span style="color: #000000;"><span style="color: #000000;">onCreate (Bundle Savedinstancestate) {</span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Super</span></span><span style="color: #000000;"><span style="color: #000000;">. OnCreate (savedinstancestate); </span></span><span style="color: #0000ff;"><span style="color: #0000ff;">Super</span></span><span style="color: #000000;"><span style="color: #000000;">. Setcontentview (r.layout.activity_main); Init_view (); }}</span></span></pre><p><p></p></p><p><p></p></p><p><p>Android TextView for scrolling display effects</p></p></span>
