【Android】Activity遮罩效果的实现
16lz
2021-12-04
Activity文件
package com.app.test02;import android.app.Activity;import android.graphics.Color;import android.os.Bundle;import android.view.Gravity;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.view.Window;import android.widget.Button;import android.widget.FrameLayout;import android.widget.TextView;public class ShadeActivity extends Activity {// 设置是否展开private boolean isFolded = true;// 设置控件private FrameLayout layout = null;private Button unfoldButton = null;private TextView textView = null;public void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_shade);initView();}@Overrideprotected void onResume() {// TODO Auto-generated method stusuper.onResume();isFolded = true;}// 初始化private void initView() {layout = (FrameLayout) findViewById(R.id.layout);unfoldButton = (Button) findViewById(R.id.unfoldButton);unfoldButton.setOnClickListener(new UnfoldClickListener());}// 按钮监听，展开一个透明的显示文本的遮挡层private class UnfoldClickListener implements OnClickListener {public void onClick(View v) {if (isFolded) {textView = new TextView(ShadeActivity.this);textView.setTextColor(Color.BLUE);textView.setTextSize(20);textView.setText("滚滚长江东逝水，浪花淘尽英雄。\n" + "是非成败转头空，\n"+ "青山依旧在，几度夕阳红。\n" + "白发渔樵江渚上，惯看秋月春风。 \n"+ "一壶浊酒喜相逢，\n" + "古今多少事，都付笑谈中。");textView.setGravity(Gravity.CENTER);textView.setLayoutParams(new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT,ViewGroup.LayoutParams.FILL_PARENT));textView.setBackgroundColor(Color.parseColor("#86222222"));unfoldButton.setText("取消遮罩");isFolded = false;layout.addView(textView);} else {unfoldButton.setText("显示遮罩");isFolded = true;layout.removeView(textView);}}}} XML布局文件
<?xml version="1.0" encoding="utf-8"?><FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/layout" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#fff"> <Gallery android:id="@+id/showGallery" android:layout_width="fill_parent" android:layout_height="fill_parent" android:spacing="0dip" /> <RelativeLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="bottom" android:background="#86222222" android:orientation="horizontal" > <TextView android:id="@+id/titleTextView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="遮罩效果" android:textColor="#ff0000" /> <Button android:id="@+id/unfoldButton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:text="显示遮罩" /> </RelativeLayout></FrameLayout>
效果图
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