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Activity遮罩效果的实现
来源:互联网   发布日期:2016-01-14 10:39:56   浏览:1325次  

导读: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...

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();

}

@Override

protected void onResume() {

// TODO Auto-generated method stu

super.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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