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最近为这个事情焦头烂额，原因无他。原来打算是把ViewPager放在WindowManager中，再设定一个定时器，让图片自动切换，但是搞了很久，发现无论如何，这个图片只显示一张。虽然日志看得出来图片确实在切换，但是除了这初始化的这张图片之外，其他的都是黑窗口，也就是没有显示出来。
此路不通，另找出路。其实未必用得着PagerAdapter。安卓就是这点方便，反正View，不管咋整，都是可以往窗口里面放的，我对界面不懂，所以这里也说不出个所以然来。但是这种需求，估计也是有的（比如有些比较恶心的广告程序，就是想要独占最上层，那用windowManager就是比较合适的方式）。
废话不多说，直接上代码
1 public class MainActivity extends Activity { 2 private Runnable viewpagerRunnable; 3 private Handler MainThreadhandler; 4 private WindowManager mWndMgr; 5 private ViewPager mViewPager; 6 private ImageView mImgView; 7 private WindowManager.LayoutParams mLayoutParams; 8 private Context mContext; 9 private List<ImageView> mImgViewList; 10 private int[] picRes = {R.drawable.first,R.drawable.second,R.drawable.third}; 11 int CurrentIndex = 0; 12 @Override 13 protected void onCreate(Bundle savedInstanceState) { 14 super.onCreate(savedInstanceState); 15 setContentView(R.layout.activity_main); 16 mContext = this.getApplicationContext(); 17 MainThreadhandler = new Handler(); 18 prepareImageView(); 19 initView(); 20 startAutomaticRoll(); 21 } 22 23 24 @Override 25 public boolean onCreateOptionsMenu(Menu menu) { 26 // Inflate the menu; this adds items to the action bar if it is present. 27 getMenuInflater().inflate(R.menu.main, menu); 28 return true; 29 } 30 31 @Override 32 public boolean onOptionsItemSelected(MenuItem item) { 33 // Handle action bar item clicks here. The action bar will 34 // automatically handle clicks on the Home/Up button, so long 35 // as you specify a parent activity in AndroidManifest.xml. 36 int id = item.getItemId(); 37 if (id == R.id.action_settings) { 38 return true; 39 } 40 return super.onOptionsItemSelected(item); 41 } 42 43 private void prepareImageView(){ 44 mViewPager = new ViewPager(mContext); 45 mWndMgr = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE); 46 DisplayMetrics outMetrics = new DisplayMetrics(); 47 mWndMgr.getDefaultDisplay().getMetrics(outMetrics); 48 mLayoutParams = new WindowManager.LayoutParams(); 49 mLayoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT; 50 mLayoutParams.width = outMetrics.widthPixels; 51 mLayoutParams.height = outMetrics.heightPixels - 150; 52 //mViewPager.setLayoutParams(mLayoutParams); 53 mImgViewList = new ArrayList<ImageView>(); 54 int len = picRes.length; 55 for(int i = 0; i < len ;i++){ 56 ImageView view = new ImageView(mContext); 57 view.setBackgroundResource(picRes[i]); 58 mImgViewList.add(view); 59 } 60 //mViewPager.setAdapter(new ViewAdapha(mImgViewList)); 61 } 62 63 public void initView(){ 64 //mWndMgr.addView(mViewPager, mLayoutParams); 65 mImgView = mImgViewList.get(CurrentIndex); 66 mImgView.setLayoutParams(mLayoutParams); 67 mWndMgr.addView(mImgView, mLayoutParams); 68 //mWndMgr.updateViewLayout(mImgView, mLayoutParams); 69 } 70 71 private void startAutomaticRoll() { 72 viewpagerRunnable = new Runnable() { 73 @Override 74 public void run() { 75 //int nowIndex = mViewPager.getCurrentItem(); 76 //int count = mViewPager.getAdapter().getCount(); 77 if (CurrentIndex + 1 >= 3) { 78 //mViewPager.setCurrentItem(0); 79 CurrentIndex = 0; 80 } else { 81 CurrentIndex = CurrentIndex + 1; 82 } 83 mWndMgr.removeView(mImgView); 84 mImgView = mImgViewList.get(CurrentIndex); 85 mImgView.setLayoutParams(mLayoutParams); 86 //mViewPager.removeAllViews(); 87 Log.i("index", "index="+CurrentIndex); 88 //mViewPager.removeAllViews(); 89 //mViewPager.addView(mImgViewList.get(CurrentIndex)); 90 mWndMgr.addView(mImgView, mLayoutParams); 91 //mWndMgr.updateViewLayout(mImgView, mLayoutParams); 92 MainThreadhandler.postDelayed(viewpagerRunnable, 3000); 93 } 94 }; 95 MainThreadhandler.postDelayed(viewpagerRunnable, 3000); 96 } 97 }
这种方式比较戳，在图片切换之间，会有闪断的现象，也就是切换的不平滑。如果有知道的朋友，还请指点下是什么情况。或者是如何才能做到在我这种方式下，把ViewPager放到WindowManager里面，再把ImageView数组放在ViewPager里面，然后还能实现正常的切换的效果。
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又修改了下，效果更好了。哈哈～～～
public class MainActivity extends Activity {
private Runnable viewpagerRunnable;
private Handler MainThreadhandler;
private WindowManager mWndMgr;
private ImageView mImgView;
private WindowManager.LayoutParams mLayoutParams;
private Context mContext;
private List<ImageView> mImgViewList;
private int[] picRes = {R.drawable.first,R.drawable.second,R.drawable.third};
int CurrentIndex = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mContext = this.getApplicationContext();
MainThreadhandler = new Handler();
prepareView();
initView();
startAutomaticRoll();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
private void prepareView(){
new ViewPager(mContext);
mWndMgr = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics outMetrics = new DisplayMetrics();
mWndMgr.getDefaultDisplay().getMetrics(outMetrics);
mLayoutParams = new WindowManager.LayoutParams();
mLayoutParams.type = WindowManager.LayoutParams.TYPE_SYSTEM_ALERT;
mLayoutParams.width = outMetrics.widthPixels;
mLayoutParams.height = outMetrics.heightPixels - 150;
mImgViewList = new ArrayList<ImageView>();
int len = picRes.length;
for(int i = 0; i < len ;i++){
ImageView view = new ImageView(mContext);
view.setBackgroundResource(picRes[i]);
mImgViewList.add(view);
}
}
public void initView(){
mImgView = mImgViewList.get(CurrentIndex);
mImgView.setLayoutParams(mLayoutParams);
mWndMgr.addView(mImgView, mLayoutParams);
}
private void startAutomaticRoll() {
viewpagerRunnable = new Runnable() {
@Override
public void run() {
if (CurrentIndex + 1 >= 3) {
CurrentIndex = 0;
} else {
CurrentIndex = CurrentIndex + 1;
}
mImgView.setBackgroundResource(picRes[CurrentIndex]);
Log.i("index", "index="+CurrentIndex);
MainThreadhandler.postDelayed(viewpagerRunnable, 3000);
}
};
MainThreadhandler.postDelayed(viewpagerRunnable, 3000);
}
}
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原文地址：http://www.cnblogs.com/duyiwuai/p/4286631.html
