android 添加界面介绍

主要使用场景是在进入新界面对新功能直观的介绍

要点：

1.添加介绍内容

2.确定添加的位置

转自API Demo

SecureView.java

/* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.example.android.apis.view;import com.example.android.apis.R;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.os.Bundle;import android.view.Gravity;import android.view.MotionEvent;import android.view.View;import android.view.View.OnClickListener;import android.view.View.OnTouchListener;import android.widget.Button;import android.widget.ProgressBar;import android.widget.Toast;/** * This activity demonstrates two different ways in which views can be made more * secure to touch spoofing attacks by leveraging framework features. *  * The activity presents 3 buttons that obtensibly perform a risky security * critical function. Under ordinary circumstances, the user would never click * on these buttons or would at least think long and hard about it. However, a * carefully crafted toast can overlay the contents of the activity in such a * way as to make the user believe the buttons are innocuous. Since the toast * cannot receive input, the touches are passed down to the activity potentially * yielding an effect other than what the user intended. *  * To simulate the spoofing risk, this activity pops up a specially crafted * overlay as a toast layed out so as to cover the buttons and part of the * descriptive text. For the purposes of this demonstration, pretend that the * overlay was actually popped up by a malicious application published by the * International Cabal of Evil Penguins. *  * The 3 buttons are set up as follows: *  * 1. The "unsecured button" does not apply any touch filtering of any kind. * When the toast appears, this button remains clickable as usual which creates * an opportunity for spoofing to occur. *  * 2. The "built-in secured button" leverages the * android:filterTouchesWhenObscured view attribute to ask the framework to * filter out touches when the window is obscured. When the toast appears, the * button does not receive the touch and appears to be inoperable. *  * 3. The "custom secured button" adds a touch listener to the button which * intercepts the touch event and checks whether the window is obscured. If so, * it warns the user and drops the touch event. This example is intended to * demonstrate how a view can perform its own filtering and provide additional * feedback by examining the {@MotionEvent} flags to determine * whether the window is obscured. Here we use a touch listener but a custom * view subclass could perform the filtering by overriding * {@link View#onFilterTouchEventForSecurity(MotionEvent)}. *  * Refer to the comments on {@View} for more information about view * security. */public class SecureView extends Activity {private int mClickCount;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.secure_view);Button toastButton = (Button) findViewById(R.id.secure_view_toast_button);toastButton.setOnClickListener(new OnClickListener() {public void onClick(View v) {showOverlay();}});Button unsecureButton = (Button) findViewById(R.id.secure_view_unsecure_button);setClickedAction(unsecureButton);Button builtinSecureButton = (Button) findViewById(R.id.secure_view_builtin_secure_button);setClickedAction(builtinSecureButton);Button customSecureButton = (Button) findViewById(R.id.secure_view_custom_secure_button);setClickedAction(customSecureButton);setTouchFilter(customSecureButton);}private void showOverlay() {// Generate a toast view with a special layout that will position itself// right// on top of this view's interesting widgets. Sneaky huh?SecureViewOverlay overlay = (SecureViewOverlay) getLayoutInflater().inflate(R.layout.secure_view_overlay, null);overlay.setActivityToSpoof(this);Dialog mDialog = new Dialog(SecureView.this, R.style.dialog);mDialog.setContentView(overlay);mDialog.show();// Toast toast = new Toast(getApplicationContext());// toast.setGravity(Gravity.FILL, 0, 0);// toast.setView(overlay);// toast.show();}private void setClickedAction(Button button) {button.setOnClickListener(new OnClickListener() {public void onClick(View v) {String[] messages = getResources().getStringArray(R.array.secure_view_clicked);String message = messages[mClickCount++ % messages.length];new AlertDialog.Builder(SecureView.this).setTitle(R.string.secure_view_action_dialog_title).setMessage(message).setNeutralButton(getResources().getString(R.string.secure_view_action_dialog_dismiss),null).show();}});}private void setTouchFilter(Button button) {button.setOnTouchListener(new OnTouchListener() {public boolean onTouch(View v, MotionEvent event) {if ((event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) {if (event.getAction() == MotionEvent.ACTION_UP) {new AlertDialog.Builder(SecureView.this).setTitle(R.string.secure_view_caught_dialog_title).setMessage(R.string.secure_view_caught_dialog_message).setNeutralButton(getResources().getString(R.string.secure_view_caught_dialog_dismiss),null).show();}// Return true to prevent the button from processing the// touch.return true;}return false;}});}}

覆盖层SecureViewOverlay.java

/* * Copyright (C) 2010 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */package com.example.android.apis.view;import android.content.Context;import android.util.AttributeSet;import android.view.View;import android.view.ViewGroup;import com.example.android.apis.R;/** * This view is part of the {@link SecureView} demonstration activity. * * This view is constructed in such a way as to obscure the buttons and descriptive * text of the activity in a poor attempt to fool the user into clicking on the buttons * despite the activity telling the user that they may be harmful. */public class SecureViewOverlay extends ViewGroup {    private SecureView mActivity;    public SecureViewOverlay(Context context, AttributeSet attrs) {        super(context, attrs);    }    public void setActivityToSpoof(SecureView activity) {        this.mActivity = activity;    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        measureChildren(widthMeasureSpec, heightMeasureSpec);        super.onMeasure(widthMeasureSpec, heightMeasureSpec);    }    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        spoofLayout(findViewById(R.id.secure_view_overlay_description),                mActivity.findViewById(R.id.secure_view_description));        spoofLayout(findViewById(R.id.secure_view_overlay_button1),                mActivity.findViewById(R.id.secure_view_unsecure_button));        spoofLayout(findViewById(R.id.secure_view_overlay_button2),                mActivity.findViewById(R.id.secure_view_builtin_secure_button));        spoofLayout(findViewById(R.id.secure_view_overlay_button3),                mActivity.findViewById(R.id.secure_view_custom_secure_button));    }    private void spoofLayout(View spoof, View original) {        final int[] globalPos = new int[2];        getLocationOnScreen(globalPos);        int x = globalPos[0];        int y = globalPos[1];        original.getLocationOnScreen(globalPos);        x = globalPos[0] - x;        y = globalPos[1] - y;        spoof.layout(x, y, x + original.getWidth(), y + original.getHeight());    }}