介绍屏幕中的 ArrayIndexOutOfBoundsException
ArrayIndexOutOfBoundsException in intro screen
我在 post 中遇到了类似的问题。那里没有答案 - android intro screen error when add to 8 screen, but not error if 4 screen
但是，在我的页面中有 4 张欢迎幻灯片，应用程序只显示其中的 2 张。第三个只是有一个错误。我的代码：
public class WelcomeActivity extends AppCompatActivity {
private ViewPager viewPager;
private MyViewPagerAdapter myViewPagerAdapter;
private LinearLayout dotsLayout;
private TextView[] dots;
private int[] layouts;
private Button btnSkip, btnNext;
private PrefManager prefManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Checking for first time launch - before calling setContentView()
prefManager = new PrefManager(this);
if (!prefManager.isFirstTimeLaunch()) {
launchHomeScreen();
finish();
}
// Making notification bar transparent
if (Build.VERSION.SDK_INT >= 21) {
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}
setContentView(R.layout.activity_welcome);
viewPager = (ViewPager) findViewById(R.id.view_pager);
dotsLayout = (LinearLayout) findViewById(R.id.layoutDots);
btnSkip = (Button) findViewById(R.id.btn_skip);
btnNext = (Button) findViewById(R.id.btn_next);
// layouts of all welcome sliders
// add few more layouts if you want
layouts = new int[]{
R.layout.welcome_slide1,
R.layout.welcome_slide2,
R.layout.welcome_slide3,
R.layout.welcome_slide4};
// adding bottom dots
addBottomDots(0);
// making notification bar transparent
changeStatusBarColor();
myViewPagerAdapter = new MyViewPagerAdapter();
viewPager.setAdapter(myViewPagerAdapter);
viewPager.addOnPageChangeListener(viewPagerPageChangeListener);
btnSkip.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
launchHomeScreen();
}
});
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// checking for last page
// if last page home screen will be launched
int current = getItem(+1);
if (current < layouts.length) {
// move to next screen
viewPager.setCurrentItem(current);
} else {
launchHomeScreen();
}
}
});
}
private void addBottomDots(int currentPage) {
dots = new TextView[layouts.length];
int[] colorsActive = getResources().getIntArray(R.array.array_dot_active);
int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);
dotsLayout.removeAllViews();
for (int i = 0; i < dots.length; i++) {
dots[i] = new TextView(this);
dots[i].setText(Html.fromHtml("•"));
dots[i].setTextSize(35);
dots[i].setTextColor(colorsInactive[currentPage]);
dotsLayout.addView(dots[i]);
}
if (dots.length > 0)
dots[currentPage].setTextColor(colorsActive[currentPage]);
}
private int getItem(int i) {
return viewPager.getCurrentItem() + i;
}
private void launchHomeScreen() {
prefManager.setFirstTimeLaunch(false);
startActivity(new Intent(WelcomeActivity.this, MainActivity.class));
finish();
}
// viewpager change listener
ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
addBottomDots(position);
// changing the next button text 'NEXT' / 'GOT IT'
if (position == layouts.length - 1) {
// last page. make button text to GOT IT
btnNext.setText(getString(R.string.start));
btnSkip.setVisibility(View.GONE);
} else {
// still pages are left
btnNext.setText(getString(R.string.next));
btnSkip.setVisibility(View.VISIBLE);
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
};
/**
* Making notification bar transparent
*/
private void changeStatusBarColor() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(Color.TRANSPARENT);
}
}
/**
* View pager adapter
*/
public class MyViewPagerAdapter extends PagerAdapter {
private LayoutInflater layoutInflater;
public MyViewPagerAdapter() {
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate(layouts[position], container, false);
container.addView(view);
return view;
}
@Override
public int getCount() {
return layouts.length;
}
@Override
public boolean isViewFromObject(View view, Object obj) {
return view == obj;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
View view = (View) object;
container.removeView(view);
}
}
}
错误：
07-01 11:17:24.961 10911-10911/com.google.android.gms.samples.vision.ocrreader E/InputEventReceiver: Exception dispatching input event.
07-01 11:17:24.961 10911-10911/com.google.android.gms.samples.vision.ocrreader E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback
07-01 11:17:24.967 10911-10911/com.google.android.gms.samples.vision.ocrreader E/MessageQueue-JNI: java.lang.ArrayIndexOutOfBoundsException: length=2; index=2
at com.google.android.gms.samples.vision.ocrreader.WelcomeActivity.addBottomDots(WelcomeActivity.java:107)
at com.google.android.gms.samples.vision.ocrreader.WelcomeActivity.access0(WelcomeActivity.java:21)
at com.google.android.gms.samples.vision.ocrreader.WelcomeActivity.onPageSelected(WelcomeActivity.java:130)
at android.support.v4.view.ViewPager.dispatchOnPageSelected(ViewPager.java:1941)
at android.support.v4.view.ViewPager.scrollToItem(ViewPager.java:680)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:664)
at android.support.v4.view.ViewPager.onTouchEvent(ViewPager.java:2257)
at android.view.View.dispatchTouchEvent(View.java:9314)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2592)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2283)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2598)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2297)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2598)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2297)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2598)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2297)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2598)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2297)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2598)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2297)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2598)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2297)
at com.android.internal.policy.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2430)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent_aroundBody0(PhoneWindow.java:1762)
at com.android.internal.policy.PhoneWindow$AjcClosure1.run(PhoneWindow.java:1)
at android.view.PhoneWindowAO.ajc$around$android_view_PhoneWindowAOce526bproceed(PhoneWindowAO.aj:149)
at android.view.PhoneWindowAO.ajc$around$android_view_PhoneWindowAOce526b(PhoneWindowAO.aj:153)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1762)
at android.app.Activity.dispatchTouchEvent(Activity.java:2807)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:68)
at com.android.internal.policy.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2391)
at android.view.View.dispatchPointerEvent(View.java:9534)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4422)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4288)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3739)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3792)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3758)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3766)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3739)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3792)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3758)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3885)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3766)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3942)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3739)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3792)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3758)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3766)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3739)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6146)
at android.view
关于您的问题
dots[i].setTextColor(colorsInactive[currentPage]);
您从资源
中获得colorsInactive
int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);
您可以在 src/main/res/arrays.xml 或类似名称的文件中找到它们。那里定义的数组名称为 array_dot_[in]active 并且只包含两个元素。要使您的代码正常工作，您需要向这些数组添加两种颜色或更改代码本身以反映只有两种颜色的事实。
一种方法是使用 %2 或 &1 产生相同的值（0 如果是偶数，1 如果是奇数 ）：
dots[i].setTextColor(colorsInactive[currentPage & 1]);
我在 post 中遇到了类似的问题。那里没有答案 - android intro screen error when add to 8 screen, but not error if 4 screen
但是，在我的页面中有 4 张欢迎幻灯片，应用程序只显示其中的 2 张。第三个只是有一个错误。我的代码：
public class WelcomeActivity extends AppCompatActivity {
private ViewPager viewPager;
private MyViewPagerAdapter myViewPagerAdapter;
private LinearLayout dotsLayout;
private TextView[] dots;
private int[] layouts;
private Button btnSkip, btnNext;
private PrefManager prefManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Checking for first time launch - before calling setContentView()
prefManager = new PrefManager(this);
if (!prefManager.isFirstTimeLaunch()) {
launchHomeScreen();
finish();
}
// Making notification bar transparent
if (Build.VERSION.SDK_INT >= 21) {
getWindow().getDecorView().setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_STABLE | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}
setContentView(R.layout.activity_welcome);
viewPager = (ViewPager) findViewById(R.id.view_pager);
dotsLayout = (LinearLayout) findViewById(R.id.layoutDots);
btnSkip = (Button) findViewById(R.id.btn_skip);
btnNext = (Button) findViewById(R.id.btn_next);
// layouts of all welcome sliders
// add few more layouts if you want
layouts = new int[]{
R.layout.welcome_slide1,
R.layout.welcome_slide2,
R.layout.welcome_slide3,
R.layout.welcome_slide4};
// adding bottom dots
addBottomDots(0);
// making notification bar transparent
changeStatusBarColor();
myViewPagerAdapter = new MyViewPagerAdapter();
viewPager.setAdapter(myViewPagerAdapter);
viewPager.addOnPageChangeListener(viewPagerPageChangeListener);
btnSkip.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
launchHomeScreen();
}
});
btnNext.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// checking for last page
// if last page home screen will be launched
int current = getItem(+1);
if (current < layouts.length) {
// move to next screen
viewPager.setCurrentItem(current);
} else {
launchHomeScreen();
}
}
});
}
private void addBottomDots(int currentPage) {
dots = new TextView[layouts.length];
int[] colorsActive = getResources().getIntArray(R.array.array_dot_active);
int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);
dotsLayout.removeAllViews();
for (int i = 0; i < dots.length; i++) {
dots[i] = new TextView(this);
dots[i].setText(Html.fromHtml("•"));
dots[i].setTextSize(35);
dots[i].setTextColor(colorsInactive[currentPage]);
dotsLayout.addView(dots[i]);
}
if (dots.length > 0)
dots[currentPage].setTextColor(colorsActive[currentPage]);
}
private int getItem(int i) {
return viewPager.getCurrentItem() + i;
}
private void launchHomeScreen() {
prefManager.setFirstTimeLaunch(false);
startActivity(new Intent(WelcomeActivity.this, MainActivity.class));
finish();
}
// viewpager change listener
ViewPager.OnPageChangeListener viewPagerPageChangeListener = new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int position) {
addBottomDots(position);
// changing the next button text 'NEXT' / 'GOT IT'
if (position == layouts.length - 1) {
// last page. make button text to GOT IT
btnNext.setText(getString(R.string.start));
btnSkip.setVisibility(View.GONE);
} else {
// still pages are left
btnNext.setText(getString(R.string.next));
btnSkip.setVisibility(View.VISIBLE);
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageScrollStateChanged(int arg0) {
}
};
/**
* Making notification bar transparent
*/
private void changeStatusBarColor() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
window.setStatusBarColor(Color.TRANSPARENT);
}
}
/**
* View pager adapter
*/
public class MyViewPagerAdapter extends PagerAdapter {
private LayoutInflater layoutInflater;
public MyViewPagerAdapter() {
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = layoutInflater.inflate(layouts[position], container, false);
container.addView(view);
return view;
}
@Override
public int getCount() {
return layouts.length;
}
@Override
public boolean isViewFromObject(View view, Object obj) {
return view == obj;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
View view = (View) object;
container.removeView(view);
}
}
}
错误：
07-01 11:17:24.961 10911-10911/com.google.android.gms.samples.vision.ocrreader E/InputEventReceiver: Exception dispatching input event.
07-01 11:17:24.961 10911-10911/com.google.android.gms.samples.vision.ocrreader E/MessageQueue-JNI: Exception in MessageQueue callback: handleReceiveCallback
07-01 11:17:24.967 10911-10911/com.google.android.gms.samples.vision.ocrreader E/MessageQueue-JNI: java.lang.ArrayIndexOutOfBoundsException: length=2; index=2
at com.google.android.gms.samples.vision.ocrreader.WelcomeActivity.addBottomDots(WelcomeActivity.java:107)
at com.google.android.gms.samples.vision.ocrreader.WelcomeActivity.access0(WelcomeActivity.java:21)
at com.google.android.gms.samples.vision.ocrreader.WelcomeActivity.onPageSelected(WelcomeActivity.java:130)
at android.support.v4.view.ViewPager.dispatchOnPageSelected(ViewPager.java:1941)
at android.support.v4.view.ViewPager.scrollToItem(ViewPager.java:680)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:664)
at android.support.v4.view.ViewPager.onTouchEvent(ViewPager.java:2257)
at android.view.View.dispatchTouchEvent(View.java:9314)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2592)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2283)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2598)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2297)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2598)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2297)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2598)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2297)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2598)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2297)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2598)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2297)
at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2598)
at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:2297)
at com.android.internal.policy.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2430)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent_aroundBody0(PhoneWindow.java:1762)
at com.android.internal.policy.PhoneWindow$AjcClosure1.run(PhoneWindow.java:1)
at android.view.PhoneWindowAO.ajc$around$android_view_PhoneWindowAOce526bproceed(PhoneWindowAO.aj:149)
at android.view.PhoneWindowAO.ajc$around$android_view_PhoneWindowAOce526b(PhoneWindowAO.aj:153)
at com.android.internal.policy.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1762)
at android.app.Activity.dispatchTouchEvent(Activity.java:2807)
at android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent(WindowCallbackWrapper.java:68)
at com.android.internal.policy.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2391)
at android.view.View.dispatchPointerEvent(View.java:9534)
at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4422)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4288)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3739)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3792)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3758)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3766)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3739)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3792)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3758)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3885)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3766)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3942)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3739)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3792)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3758)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3766)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3739)
at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:6146)
at android.view
关于您的问题
dots[i].setTextColor(colorsInactive[currentPage]);
您从资源
中获得colorsInactive
int[] colorsInactive = getResources().getIntArray(R.array.array_dot_inactive);
您可以在 src/main/res/arrays.xml 或类似名称的文件中找到它们。那里定义的数组名称为 array_dot_[in]active 并且只包含两个元素。要使您的代码正常工作，您需要向这些数组添加两种颜色或更改代码本身以反映只有两种颜色的事实。
一种方法是使用 %2 或 &1 产生相同的值（0 如果是偶数，1 如果是奇数 ）：
dots[i].setTextColor(colorsInactive[currentPage & 1]);