启动引导界面实现(类似手机主界面切换应用屏幕)
我们手机安装很多应用时，分屏摆放，不同屏的应用切换时的效果我们使用得多，如何实现呢?转载自:
(1)主界面代码SwitchViewDemoActivity.java:
package com.example.switchview;
import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.LinearLayout.LayoutParams;
public class SwitchViewDemoActivity extends Activity implements
OnViewChangeListener, OnClickListener {
private MyScrollLayout mScrollLayout;
private ImageView[] mImageViews;
private int mViewCount;
private int mCurSel;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
mScrollLayout = (MyScrollLayout) findViewById(R.id.ScrollLayout);
LinearLayout linearLayout = (LinearLayout) findViewById(R.id.llayout);
//如果不想写死在布局文件里也可以动态添加，这里动态添加一个作为示例
// 动态添加一个layout控件
LinearLayout layout = new LinearLayout(this);
layout.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));
layout.setBackgroundResource(R.drawable.mm_1);
mScrollLayout.addView(layout);
// 动态添加一个imageView控件
ImageView imageView = new ImageView(this);
LayoutParams lp = new LayoutParams(LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
lp.gravity = Gravity.CENTER;
imageView.setLayoutParams(lp);
imageView.setPadding(15, 15, 15, 15);
imageView.setImageResource(R.drawable.white_dot);
linearLayout.addView(imageView);
mViewCount = mScrollLayout.getChildCount();
mImageViews = new ImageView[mViewCount];
for (int i = 0; i < mViewCount; i++) {
mImageViews[i] = (ImageView) linearLayout.getChildAt(i);
mImageViews[i].setEnabled(true);
mImageViews[i].setOnClickListener(this);
mImageViews[i].setTag(i);
}
mCurSel = 0;
mImageViews[mCurSel].setEnabled(false);
mScrollLayout.SetOnViewChangeListener(this);
}
private void setCurPoint(int index) {
if (index < 0 || index > mViewCount - 1 || mCurSel == index) {
return;
}
mImageViews[mCurSel].setImageResource(R.drawable.white_dot);
mImageViews[index].setImageResource(R.drawable.green_dot);
mImageViews[mCurSel].setEnabled(true);
mImageViews[index].setEnabled(false);
mCurSel = index;
}
@Override
public void OnViewChange(int view) {
setCurPoint(view);
}
@Override
public void onClick(View v) {
int pos = (Integer) (v.getTag());
setCurPoint(pos);
mScrollLayout.snapToScreen(pos);
}
}(2) 主滑动自定义控件MyScrollLayout.java:
package com.example.switchview;
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Scroller;
/**
* 一组图片滑动主控件
*
* @author chenwenbiao
* @date 2014-6-7 下午3:55:12
* @version V1.0
*/
public class MyScrollLayout extends ViewGroup {
private VelocityTracker mVelocityTracker; // 用于判断甩动手势
private static final int SNAP_VELOCITY = 600;
private Scroller mScroller; // 滑动控制器
private int mCurScreen;
private int mDefaultScreen = 0;
private float mLastMotionX;
// private int mTouchSlop;
private OnViewChangeListener mOnViewChangeListener;
public MyScrollLayout(Context context) {
super(context);
// TODO Auto-generated constructor stub
init(context);
}
public MyScrollLayout(Context context, AttributeSet attrs) {
super(context, attrs);
// TODO Auto-generated constructor stub
init(context);
}
public MyScrollLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
// TODO Auto-generated constructor stub
init(context);
}
private void init(Context context) {
mCurScreen = mDefaultScreen;
// mTouchSlop =
// ViewConfiguration.get(getContext()).getScaledTouchSlop();
mScroller = new Scroller(context);
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
// TODO Auto-generated method stub
if (changed) {
int childLeft = 0;
final int childCount = getChildCount();
for (int i = 0; i < childCount; i++) {
final View childView = getChildAt(i);
if (childView.getVisibility() != View.GONE) {
final int childWidth = childView.getMeasuredWidth();
childView.layout(childLeft, 0, childLeft + childWidth,
childView.getMeasuredHeight());
childLeft += childWidth;
}
}
}
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
// TODO Auto-generated method stub
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
final int width = MeasureSpec.getSize(widthMeasureSpec);
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
final int count = getChildCount();
for (int i = 0; i < count; i++) {
getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec);
}
scrollTo(mCurScreen * width, 0);
}
public void snapToDestination() {
final int screenWidth = getWidth();
final int destScreen = (getScrollX() + screenWidth / 2) / screenWidth;
snapToScreen(destScreen);
}
public void snapToScreen(int whichScreen) {
// get the valid layout page
whichScreen = Math.max(0, Math.min(whichScreen, getChildCount() - 1));
if (getScrollX() != (whichScreen * getWidth())) {
final int delta = whichScreen * getWidth() - getScrollX();
mScroller.startScroll(getScrollX(), 0, delta, 0,
Math.abs(delta) * 2);
mCurScreen = whichScreen;
invalidate(); // Redraw the layout
if (mOnViewChangeListener != null) {
mOnViewChangeListener.OnViewChange(mCurScreen);
}
}
}
@Override
public void computeScroll() {
// TODO Auto-generated method stub
if (mScroller.computeScrollOffset()) {
scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
postInvalidate();
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
// TODO Auto-generated method stub
final int action = event.getAction();
final float x = event.getX();
final float y = event.getY();
switch (action) {
case MotionEvent.ACTION_DOWN:
Log.i("", "onTouchEvent ACTION_DOWN");
if (mVelocityTracker == null) {
mVelocityTracker = VelocityTracker.obtain();
mVelocityTracker.addMovement(event);
}
if (!mScroller.isFinished()) {
mScroller.abortAnimation();
}
mLastMotionX = x;
break;
case MotionEvent.ACTION_MOVE:
int deltaX = (int) (mLastMotionX - x);
if (IsCanMove(deltaX)) {
if (mVelocityTracker != null) {
mVelocityTracker.addMovement(event);
}
mLastMotionX = x;
scrollBy(deltaX, 0);
}
break;
case MotionEvent.ACTION_UP:
int velocityX = 0;
if (mVelocityTracker != null) {
mVelocityTracker.addMovement(event);
mVelocityTracker.computeCurrentVelocity(1000);
velocityX = (int) mVelocityTracker.getXVelocity();
}
if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {
// Fling enough to move left
snapToScreen(mCurScreen - 1);
} else if (velocityX < -SNAP_VELOCITY
&& mCurScreen < getChildCount() - 1) {
// Fling enough to move right
snapToScreen(mCurScreen + 1);
} else {
snapToDestination();
}
if (mVelocityTracker != null) {
mVelocityTracker.recycle();
mVelocityTracker = null;
}
// mTouchState = TOUCH_STATE_REST;
break;
}
return true;
}
private boolean IsCanMove(int deltaX) {
if (getScrollX() <= 0 && deltaX < 0) {
return false;
}
if (getScrollX() >= (getChildCount() - 1) * getWidth() && deltaX > 0) {
return false;
}
return true;
}
public void SetOnViewChangeListener(OnViewChangeListener listener) {
mOnViewChangeListener = listener;
}
}（3）接口OnViewChangeListener:
package com.example.switchview;
public interface OnViewChangeListener {
public void OnViewChange(int view);
}（4）布局文件activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<com.example.switchview.MyScrollLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/ScrollLayout"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/mm_1" >
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/mm_2" >
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/mm_3" >
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/mm_4" >
</LinearLayout>
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/mm_5" >
</LinearLayout>
</com.example.switchview.MyScrollLayout>
<LinearLayout
android:id="@+id/llayout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="24.0dip"
android:orientation="horizontal" >
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:clickable="true"
android:padding="15.0dip"
android:src="@drawable/green_dot" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:clickable="true"
android:padding="15.0dip"
android:src="@drawable/white_dot" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:clickable="true"
android:padding="15.0dip"
android:src="@drawable/white_dot" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:clickable="true"
android:padding="15.0dip"
android:src="@drawable/white_dot" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:clickable="true"
android:padding="15.0dip"
android:src="@drawable/white_dot" />
</LinearLayout>
</RelativeLayout>效果图:
切换的都是图片，这里可能会使用到就是点，也上传了.
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