使用FrameLayout实现遮罩层.doc

使用FrameLayout实现遮罩层 博客分类：android基础AndroidITeyeOSXML利用FrameLayout的特性,可以实现一个简单的遮罩层.Xml代码 1 2 7 12 19 24 28 29 Java代码 30 package com.ql.app; 31 32 import android.app.Activity; 33 import android.graphics.Color; 34 import android.os.Bundle; 35 import android.view.Gravity; 36 import android.view.View; 37 import android.view.ViewGroup; 38 import android.view.Window; 39 import android.view.View.OnClickListener; 40 import android.widget.Button; 41 import android.widget.FrameLayout; 42 import android.widget.TextView; 43 44 public class App extends Activity 45 46 private boolean isMask = true; 47 48 private FrameLayout layout = null; 49 private Button btn = null; 50 private TextView textView = null; 51 52 public void onCreate(Bundle savedInstanceState) 53 super.onCreate(savedInstanceState); 54 requestWindowFeature(Window.FEATURE_NO_TITLE); 55 setContentView(R.layout.main); 56 57 initViews(); 58 59 60 private void initViews() 61 62 layout = (FrameLayout) findViewById(R.id.layout); 63 btn = (Button) findViewById(R.id.btn); 64 btn.setOnClickListener(new MaskListener(); 65 66 67 68 / 按钮监听，显示/隐藏遮罩 69 private class MaskListener implements OnClickListener 70 public void onClick(View v) 71 if (isMask) 72 if(textView=null) 73 textView = new TextView(App.this); 74 textView.setTextColor(Color.BLUE); 75 textView.setTextSize(20); 76 textView.setText(I am a mask.); 77 textView.setGravity(Gravity.CENTER); 78 textView.setLayoutParams(new ViewGroup.LayoutParams( 79 ViewGroup.LayoutParams.FILL_PARENT, 80 ViewGroup.LayoutParams.FILL_PARENT); 81 textView.setBackgroundColor(Color.parseColor(#33FFFFFF); 82 83 btn.setText(show); 84 isMask = false; 85 layout.addView(textView); 86 e