New UI-set visible and invisible view, newui-view visible

New UI-set visible and invisible view, newui-view visible

New UI-set visible and invisible View

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This section introduces:

Controlling the visibility of a View is invisible. It can be understood as hiding. This is also an attribute that we use when writing a painting layout,

For example, hide a button to display it in a specific situation, or click a button to display the hidden ImageView or

ListView and so on. This attribute is still quite common. You need to know it! When you need a View, you do not want it to be displayed

You can use the Visibility attribute on the interface!

1) XML settings

Android: visibility = "gone" // invisible and not occupying space
Android: visibility = "visible" // visible
Android: visibility = "invisible" // invisible, but occupying space

2) Dynamic Setting of Java code

Suppose there is such a TextView TV in the interface;

TV. setVisibility (View. GONE); // invisible and not occupying space. The constant value is 0x00000008.
TV. setVisibility (View. VISIBLE); // VISIBLE, constant value: 0x00000000
TV. setVisibility (View. INVISIBLE); // INVISIBLE, but occupying space, constant value: 0x00000004

3) simple example:

Run:

The usage of this attribute is simple, so let's look at the sample code:

Activity_main.xml:

<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" tools: context = "com. jay. example. visibilitydemo. mainActivity "> <TextView android: id =" @ + id/txtPage "android: layout_width =" wrap_content "android: layout_height =" wrap_content "android: layout_centerInParent =" true "android: text = "1/10" android: textColor = "# FF7878" android: textSize = "20sp"/> <Button android: id = "@ + id/btnPageBefore" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: layout_alignParentLeft = "true" android: layout_centerVertical = "true" android: text = "Previous Page"/> <Button android: id = "@ + id/btnPageNext" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: layout_alignParentRight = "true" android: layout_centerVertical = "true: text = "next page"/> </RelativeLayout>

MainActivity. java:

package com.jay.example.visibilitydemo;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity {private TextView txtPage;private Button btnPageNext;private Button btnPageBefore;private MyClick myClick;private int page = 1;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);findViews();setUpViews();}private void findViews() {txtPage = (TextView) findViewById(R.id.txtPage);btnPageNext = (Button) findViewById(R.id.btnPageNext);btnPageBefore = (Button) findViewById(R.id.btnPageBefore);}private void setUpViews() {myClick = new MyClick();btnPageNext.setOnClickListener(myClick);btnPageBefore.setOnClickListener(myClick);}private class MyClick implements OnClickListener {@Overridepublic void onClick(View v) {switch (v.getId()) {case R.id.btnPageNext:btnPageBefore.setVisibility(View.VISIBLE);page++;txtPage.setText(page + "/10");if(page == 10){btnPageNext.setVisibility(View.GONE);}break;case R.id.btnPageBefore:btnPageNext.setVisibility(View.VISIBLE);page--;txtPage.setText(page + "/10");if(page == 0){btnPageBefore.setVisibility(View.GONE);}break;}}}}