1.落笔缘由
之前有遇到要做透明遮罩的需求，现在来好好总结一下。实现遮罩的方式我这里总结了四种，分别是使用FrameLayout实现，PopupWindow实现，Dialog实现和WindowManager实现。
2.例子解析
1）FrameLayout实现
FrameLayout实现的遮罩能够控制遮罩大小，但是无法控制位置。而且能设置动画，但是FrameLayout实现的遮罩有个需要处理的问题，就是透过透明遮罩，是点击下一层的按钮是能触发该按钮的点击事件的。解决这个问题的方法是在透明遮罩的布局里设置android:clickable="true"，或者在代码里直接设置setClickable(true);
/**
* 遮罩
* 1.是否可以控制遮罩大小和位置
* 2.是否有动画 有
*FrameLayout作为底布局，可以控制遮罩大小，但是无法控制遮罩的位置，例如你无法让遮罩居中，因为FrameLayout只能从左上角开始布置布局，而且，你可以点击遮罩下布局的按钮
* FrameLayout两布局重叠,如何让下层不响应事件？可以在上层布局设置android:clickable="true"，经过测试是有效的
*/
public class TestFramelayoutActivity extends Activity{
private View translucenceLayut = null;
private Button btnShow,btnHide,btnClose;
private FrameLayout body = null;
private Animation inAnimation ,outAnimation;
private LinearLayout llbody = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.test_framelayout);
body = (FrameLayout) findViewById(R.id.framebody);
llbody = (LinearLayout) findViewById(R.id.body);
inAnimation = AnimationUtils.loadAnimation(this,R.anim.top_in2);
outAnimation = AnimationUtils.loadAnimation(this,R.anim.top_out2);
translucenceLayut = LayoutInflater.from(this).inflate(R.layout.translucence_layer_framelayout_layout,null,false);
body.addView(translucenceLayut,new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT));
translucenceLayut.setVisibility(View.INVISIBLE);
btnHide = (Button) findViewById(R.id.btn_hide);
btnHide.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
translucenceLayut.startAnimation(outAnimation);
translucenceLayut.setVisibility(View.INVISIBLE);
}
});
btnShow = (Button) findViewById(R.id.btn_show);
btnShow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
translucenceLayut.startAnimation(inAnimation);
translucenceLayut.setVisibility(View.VISIBLE);
}
});
btnClose = (Button) translucenceLayut.findViewById(R.id.close);
btnClose.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
translucenceLayut.startAnimation(outAnimation);
translucenceLayut.setVisibility(View.INVISIBLE);
}
});
}
}
2）PopupWindow实现
PopupWindow实现的遮罩，可以控制大小和位置，可以设置动画效果，通过 popup.setAnimationStyle(R.style.popwin_anim_style)设置。但是也有一些需要注意的地方，这些在代码中指出。
/**
* 可以控制大小和位置
* 可以设置动画效果，通过 popup.setAnimationStyle(R.style.popwin_anim_style)设置
*/
public class TestPopupWindowActivity extends Activity {
private Button btnShow = null;
private PopupWindow popup = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test_popupwindow);
btnShow = (Button) findViewById(R.id.btnShow);
btnShow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (popup!=null)
{
popup.showAtLocation(TestPopupWindowActivity.this.findViewById(R.id.body), Gravity.CENTER, 0, 0);
}
}
});
popup = new PopupWindow(this);
View popView = LayoutInflater.from(this).inflate(R.layout.popupwindow_translucence_layer_layout, null);
// 设置透明度setAlpha，在popupWindow里最好设置，因为popupWindow透明效果不是很好
// popView.setAlpha(0.5f);
popup.setContentView(popView);
popup.setAnimationStyle(R.style.popwin_anim_style);
// popup.setEnterTransition(inAnimation);
// popup.setExitTransition(outAnimation);
popup.setFocusable(true);
//需要设置这个，否则popup的遮罩无法撑满整个屏幕（边上会有漏光）
popup.setBackgroundDrawable(new ColorDrawable(Color.parseColor("#00000000")));// 设置背景图片，不能在布局中设置，要通过代码来设置
DisplayMetrics metric = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metric);
int width = metric.widthPixels; // 屏幕宽度（像素）
int height = metric.heightPixels; // 屏幕高度（像素）
// popup.setWidth(Integer.parseInt(new DecimalFormat("0").format(width * 0.8)));
//
// popup.setHeight(Integer.parseInt(new DecimalFormat("0").format(height * 0.8)));
// popup.setWidth(width);
// popup.setHeight(height);
popup.setWidth(WindowManager.LayoutParams.MATCH_PARENT);
popup.setHeight(WindowManager.LayoutParams.MATCH_PARENT);
Button btnHide = (Button) popView.findViewById(R.id.btn_hide);
btnHide.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
popup.dismiss();
}
});
}
}
3)Dialog实现
Dialog实现的遮罩需要处理的问题比较多，不太建议作为遮罩使用。
/**
* Created by LGY on 2017/4/30.
* 1.使用dialog确实能控制遮罩大小和位置，dialog本来就自带透明背景，所以如果遮罩如果小于被遮布局，那么看起来效果不好
* 而且要实现透明的dialog,需要设置dialog的透明度，但是这会使dialog里的控件也都拥有透明度，
* 即使里面的控件设置了背景色和透明度也没有效果
* 2.dialog不太适合做遮罩，要处理的细节太多
*/
public class OutlineDialog extends Dialog {
private Button btn_hide = null;
private OnBtnHideClickListner mListner = null;
public OutlineDialog(Context context) {
super(context);
}
/**
* @param context
* @param theme
*/
public OutlineDialog(Context context, int theme) {
super(context, theme);
}
@Override
protected void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.dialog_translucence_layout);
Window dialogWindow = getWindow();
WindowManager.LayoutParams lp = dialogWindow.getAttributes();
lp.width = LayoutParams.MATCH_PARENT; // 宽度
lp.height = LayoutParams.MATCH_PARENT; // 高度
lp.alpha = 0.7f;
dialogWindow.setAttributes(lp);
dialogWindow.setWindowAnimations(R.style.popwin_anim_style);
btn_hide = (Button) findViewById(R.id.btn_hide);
btn_hide.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (mListner!=null )
{
mListner.OnBtnHideClick();
}
}
});
}
public void setOnBtnHideClickListner(OnBtnHideClickListner mListner)
{
this.mListner = mListner;
}
public interface OnBtnHideClickListner
{
public void OnBtnHideClick();
}
}
4）WindowManager实现
WindowManager实现的遮罩可以控制遮罩大小和位置，但是没有动画，至少我还没发现如何实现动画。
/*
* WindowManager可以控制遮罩大小和位置
* 但是，它不适合给遮罩添加转场动画
*
* */
public class TestWindowManagerActivity extends Activity {
private WindowManager windowManager = null;
private LinearLayout translucenceLayout = null;
private Button btnShow,btnClose;
WindowManager.LayoutParams params = null;
private Animation inAnimation ,outAnimation;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.test_window_manager);
initTranslucenceLayout();
initWindowManager();
inAnimation = AnimationUtils.loadAnimation(this,R.anim.top_in);
outAnimation = AnimationUtils.loadAnimation(this,R.anim.top_out);
btnClose.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Log.e("lgy","123");
if (windowManager!=null)
{
// translucenceLayout.startAnimation(outAnimation);
windowManager.removeView(translucenceLayout);
}
}
});
btnShow = (Button) findViewById(R.id.btnShow);
btnShow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (windowManager!=null&¶ms!=null)
{
windowManager.addView(translucenceLayout,params);
// translucenceLayout.setVisibility(View.INVISIBLE);
// translucenceLayout.startAnimation(inAnimation);
// translucenceLayout.setVisibility(View.VISIBLE);
}
}
});
}
@Override
protected void onStart() {
super.onStart();
}
@Override
protected void onResume() {
super.onResume();
}
private void initTranslucenceLayout()
{
translucenceLayout = new LinearLayout(this);
if (translucenceLayout!=null){
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT,LinearLayout.LayoutParams.MATCH_PARENT);
translucenceLayout.setLayoutParams(params);
translucenceLayout.setBackgroundColor(Color.parseColor("#e0999999"));
translucenceLayout.setOrientation(LinearLayout.VERTICAL);
translucenceLayout.setGravity(Gravity.CENTER_VERTICAL);
btnClose = new Button(this);
if (btnClose!=null)
{
params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);
btnClose.setLayoutParams(params);
btnClose.setText("隐藏");
translucenceLayout.addView(btnClose);
}
}
}
private void initWindowManager() {
windowManager = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
// 设置LayoutParams参数
params = new WindowManager.LayoutParams();
// 设置显示的类型，TYPE_PHONE指的是来电话的时候会被覆盖，其他时候会在最前端，显示位置在stateBar下面，其他更多的值请查阅文档
params.type = WindowManager.LayoutParams.TYPE_APPLICATION_PANEL ;
// 设置显示格式
params.format = PixelFormat.RGBA_8888;
// 设置对齐方式
params.gravity = Gravity.LEFT | Gravity.TOP;
// 设置宽高
params.width = WindowManager.LayoutParams.MATCH_PARENT;
params.height = WindowManager.LayoutParams.MATCH_PARENT;
//在进行 windowManager.addView操作前，务必要确定当前的activity已经创建运行，否则
//会报错WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
// windowManager.addView(translucenceLayout,params);
// translucenceLayout.setVisibility(View.INVISIBLE);
}
}
3.源码地址
http://download.csdn.net/detail/lgywsdy/9851645