Android TextView Some instances of text (text folding/color)

TextView text State one , TextView text color TextColor Focus effect

The code is as follows

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<textview Android:id= "@+id/tv_quit" Android:layout_width= "Wrap_content" android:layout_height= "Wrap_content" Android:textcolor= "@drawable/list_item_color"/> List_item_color file <?xml version= "1.0" encoding= "Utf-8"?> <selector xmlns:android= "Http://schemas.android.com/apk/res/android" > <!--click--> Font Color When selected <item android:state_pressed= "true" android:color= "#FFFFFF"/> < font color When the!--has focus--> <item android:state_focused= "true" android:color= "#FFFFFF"/> <!--font Color--> when scrolling selected <item android:state_selected= "true" android:color= "#FFFFFF"/> <!--default font color--> <item android:color= "#000000"/> </selector>

TextView text State two , Android textview text Folding effect

This example to achieve the effect of text expansion, that is, the default display only 4 lines of text, if TextView text more than 4 lines, click on the lower right corner of more buttons to see all the content. The previous practice is based on the number of words in the TextView to judge, the effect is not very good. Here in a framelayout package of two TextView

Layout file Activity_main.xml

The code is as follows

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<relativelayout xmlns:android= "Http://schemas.android.com/apk/res/android" Xmlns:tools= "Http://schemas.android.com/tools" Android:layout_width= "Match_parent" android:layout_height= "Match_parent" Android:padding= "10DP" Tools:context= ". Mainactivity "> <textview Android:id= "@+id/tv_title" Android:layout_width= "Wrap_content" android:layout_height= "Wrap_content" Android:layout_centerhorizontal= "true" android:layout_margintop= "10DP" Android:layout_marginbottom= "10DP" android:text= "@string/textview_fold"/> <FrameLayout          android:id= "@+id/fl_desc"           android:layout_width= "fill_parent"            android:layout_height= "wrap_content"           android:layout_below= "@id/tv_title"           android:fadingedge= " Horizontal "          android:fadingedgelength=" 5DP ">&NBSP;         <TextView               android:id= "@+id/tv_desc_short"                android:layout_width= "fill_parent"                android:layout_height= "wrap_content"                android:maxlines= "4"                android:textcolor= "@color/black"                android:textsize= "16sp"/>&NBSP;         <TextView               android:id= "@+id/tv_desc_long"                android:layout_width= "fill_parent"                android:layout_height= "wrap_content"                android:textcolor= "@color/black"                android:textsize= "16sp"/>      </FrameLayout>   <button Android:id= "@+id/bt_more" Android:layout_width= "50DP" android:layout_height= "25DP" Android:layout_alignparentright= "true" android:layout_below= "@id/fl_desc" android:layout_marginright= "10DP" Android:background= "#1c000000" android:gravity= "Center" android:text= "@string/label_more" Android:textsize= "15SP" android:visibility= "Gone"/> <imageview Android:id= "@+id/iv_more_line" Android:layout_width= "Fill_parent" android:layout_height= "Wrap_content" Android:layout_alignbaseline= "@id/bt_more" android:layout_below= "@id/fl_desc" android:layout_toleftof= "@id/bt_more" android:background= "@drawable/more_line" android:contentdescription= "@string/app_name" android:visibility= "Gone"/> </RelativeLayout>

Mainactivity.java

The code is as follows

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Package com.example.textviewfold; Import android.app.Activity; Import Android.os.Bundle; Import Android.view.View; Import Android.view.View.OnClickListener; Import Android.view.ViewTreeObserver; Import Android.view.ViewTreeObserver.OnPreDrawListener; Import Android.widget.Button; Import Android.widget.FrameLayout; Import Android.widget.ImageView; Import Android.widget.TextView; public class Mainactivity extends activity implements Onclicklistener { Private Button Bt_more; Private Framelayout Fl_desc; Private TextView Tv_desc_short; Private TextView Tv_desc_long; Private Boolean isinit = false; Private Boolean isshowshorttext = true; Private ImageView Iv_more_line; @Override protected void OnCreate (Bundle savedinstancestate) { Super.oncreate (savedinstancestate); Setcontentview (R.layout.activity_main); Findview (); Initview (); Setlistener (); } private void Setlistener () { Bt_more.setonclicklistener (this); } private void Initview () { String content = "Sina Science and technology news Beijing time July 25, in the morning of the new product launch, Google released the Android 4.3 version, code-named still" jelly beans (Jelly bean). Today's new generation of Nexus 7 will be equipped with the operating system, and Nexus Series devices can receive OTA push updates today. The Android 4.3 operating system adds a range of features. The first is the multiuser Settings feature, including the restricted file (Restricted profiles) feature for child protection. Users can limit the application content to prevent children from seeing inappropriate content when using the application, or to purchase advertisements in inappropriate applications. This feature is similar to the Microsoft Windows Phone's "Children's Park (Microsoft's Kid ' Corner)" feature. The second upgrade is the smart Bluetooth (Bluetooth Smart) feature, the Low-power bluetooth (Bluetooth low energy). "; Tv_desc_short.settext (content); Tv_desc_long.settext (content); Viewtreeobserver vto = Fl_desc.getviewtreeobserver (); Vto.addonpredrawlistener (New Onpredrawlistener () { @Override public Boolean Onpredraw () { if (isinit) return true; if (Mesuredescription (Tv_desc_short, Tv_desc_long)) { Iv_more_line.setvisibility (view.visible); Bt_more.setvisibility (view.visible); } Isinit = true; return true; } }); } /** * Calculate whether the descriptive information is too long */ Private Boolean mesuredescription (TextView Shortview, TextView longView) { Final int shortheight = Shortview.getheight (); Final int longheight = Longview.getheight (); if (Longheight > Shortheight) { Shortview.setvisibility (view.visible); Longview.setvisibility (View.gone); return true; } Shortview.setvisibility (View.gone); Longview.setvisibility (view.visible); return false; } private void Findview () { Fl_desc = (framelayout) Findviewbyid (R.ID.FL_DESC); Tv_desc_short = (TextView) Findviewbyid (R.id.tv_desc_short); Tv_desc_long = (TextView) Findviewbyid (R.id.tv_desc_long); Bt_more = (Button) Findviewbyid (R.id.bt_more); Iv_more_line = (ImageView) Findviewbyid (r.id.iv_more_line); } @Override public void OnClick (View v) { Switch (V.getid ()) { Case R.id.bt_more: if (Isshowshorttext) { Tv_desc_short.setvisibility (View.gone); Tv_desc_long.setvisibility (view.visible); } else { Tv_desc_short.setvisibility (view.visible); Tv_desc_long.setvisibility (View.gone); } Tooglemorebutton (Bt_more); Isshowshorttext =!isshowshorttext; Break Default Break } } /** * Change the text of the button "more" */ private void Tooglemorebutton (Button btn) { String text = (string) btn.gettext (); String MoreText = getString (R.string.label_more); String Lesstext = getString (r.string.label_less); if (moretext.equals (text)) { Btn.settext (Lesstext); } else { Btn.settext (MoreText); } } }

Run effect

is the expanded state

The status after the expansion