android.webkit.WebView#postDelayed ( )源码实例Demo

public static void webViewLoadLocalHtml(final WebView view, String jsPath) {
    String htmlData = assetFileToString(view.getContext(), jsPath);
    view.loadDataWithBaseURL("http://localhost", htmlData, "text/html", "UTF-8", null);
    //必须要延迟一定的时间 方便html字符串先加载完
    view.postDelayed(new Runnable() {
        @Override
        public void run() {
            LatLng latLng = GpsMockConfig.getMockLocation();
            if (latLng == null) {
                latLng = new LatLng(0, 0);
            }
            String url = String.format("javascript:init(%s,%s)", latLng.latitude, latLng.longitude);
            //String url = String.format("javascript:init(%s,%s)", 0, 0);
            //String url = String.format("javascript:init(%s,%s)", 39.901933, 116.396613);
            view.loadUrl(url);
        }
    }, 1000);

}
 

@Override
public void onScaleChanged(final WebView view, final float oldScale, final float newScale) {
	if (view.isShown() && mTextReflow && API >= android.os.Build.VERSION_CODES.KITKAT) {
		if (mIsRunning)
			return;
		if (Math.abs(mZoomScale - newScale) > 0.01f) {
			mIsRunning = view.postDelayed(new Runnable() {

				@Override
				public void run() {
					mZoomScale = newScale;
					view.evaluateJavascript(Constants.JAVASCRIPT_TEXT_REFLOW, null);
					mIsRunning = false;
				}

			}, 100);
		}

	}
}
 

@Override
public void onProgressChanged(WebView view, int newProgress) {
    fragment.getProgressBar().setProgress(newProgress);
    if (newProgress == 100) {
        view.postDelayed(new Runnable() {
            @Override
            public void run() {
                fragment.getProgressBar().setVisibility(View.GONE);
            }
        }, 500);
    } else {
        if (fragment.getProgressBar().getVisibility() == View.GONE) {
            fragment.getProgressBar().setVisibility(View.VISIBLE);
        }
    }
}
 

@TargetApi(Build.VERSION_CODES.KITKAT)
@Override
public void onScaleChanged(@NonNull final WebView view, final float oldScale, final float newScale) {
    if (view.isShown() && mLightningView.mPreferences.getTextReflowEnabled() &&
        Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
        if (mIsRunning)
            return;
        float changeInPercent = Math.abs(100 - 100 / mZoomScale * newScale);
        if (changeInPercent > 2.5f && !mIsRunning) {
            mIsRunning = view.postDelayed(new Runnable() {
                @Override
                public void run() {
                    mZoomScale = newScale;
                    view.evaluateJavascript(Constants.JAVASCRIPT_TEXT_REFLOW, new ValueCallback<String>() {
                        @Override
                        public void onReceiveValue(String value) {
                            mIsRunning = false;
                        }
                    });
                }
            }, 100);
        }

    }
}
 

@TargetApi(Build.VERSION_CODES.KITKAT)
@Override
public void onScaleChanged(@NonNull final WebView view, final float oldScale, final float newScale) {
    if (view.isShown() && mLightningView.mPreferences.getTextReflowEnabled() &&
        Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT) {
        if (mIsRunning)
            return;
        float changeInPercent = Math.abs(100 - 100 / mZoomScale * newScale);
        if (changeInPercent > 2.5f && !mIsRunning) {
            mIsRunning = view.postDelayed(new Runnable() {
                @Override
                public void run() {
                    mZoomScale = newScale;
                    view.evaluateJavascript(Constants.JAVASCRIPT_TEXT_REFLOW, new ValueCallback<String>() {
                        @Override
                        public void onReceiveValue(String value) {
                            mIsRunning = false;
                        }
                    });
                }
            }, 100);
        }

    }
}
 

@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
    super.onPageStarted(view, url, favicon);

    if (startsWith(url, mOnErrorUrl)) {
        mUrl = url;
        mLoadingError = true;
        mLoadingFinished = false;
        onPageFinished(view, url);
    }
    if (mUrl == null) {
        mUrl = url;
        mLoadingError = false;
        mLoadingFinished = false;
        view.removeCallbacks(mPageLoadingTimeoutHandlerTask);
        view.postDelayed(mPageLoadingTimeoutHandlerTask, LOADING_ERROR_TIMEOUT);
        mReference = new WeakReference<>(view);
    }
}
 

/**
 * 控制键盘显隐，如果输入法在窗口上已经显示，则隐藏，反之则显示
 */
public static void closeInputKeyboard(final IQuickFragment webLoader, WebView wv, JSONObject param, final Callback callback) {
    wv.postDelayed(new Runnable() {
        public void run() {
            DeviceUtil.hideInputKeyboard(webLoader.getPageControl().getActivity());
            callback.applySuccess();
        }
    }, 200);
}
 

@Override
public void onScaleChanged(final WebView view, float oldScale, float newScale) {
    final long now = System.currentTimeMillis();
    if (mStableScale == null || (now - mStableScaleCalculationStart) < STABLE_SCALE_CALCULATION_DURATION) {
        mStableScale = "" + newScale;
    } else if (!mStableScale.equals("" + newScale)) {
        boolean zooming = (now - mRestoringScaleStart) < STABLE_SCALE_CALCULATION_DURATION;
        if (!zooming) {
            mRestoringScaleStart = now;
            view.zoomOut();
            view.postDelayed(view::zoomOut
            , STABLE_SCALE_CALCULATION_DURATION);
        }
    }
}