Java tutorial
/******************************************************************************* * Copyright 2011, 2012 Chris Banes. * 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 cn.djangoogle.pull2load.internal; import android.annotation.SuppressLint; import android.content.Context; import android.content.res.ColorStateList; import android.content.res.TypedArray; import android.graphics.Typeface; import android.graphics.drawable.AnimationDrawable; import android.graphics.drawable.Drawable; import android.support.v4.content.ContextCompat; import android.text.TextUtils; import android.util.TypedValue; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.animation.Interpolator; import android.view.animation.LinearInterpolator; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.TextView; import com.pnikosis.materialishprogress.ProgressWheel; import cn.djangoogle.pull2load.ILoadingLayout; import cn.djangoogle.pull2load.Pull2LoadBase.Mode; import cn.djangoogle.pull2load.Pull2LoadBase.Orientation; import cn.djangoogle.pull2load.R; @SuppressLint("ViewConstructor") public abstract class LoadingLayout extends FrameLayout implements ILoadingLayout { static final Interpolator ANIMATION_INTERPOLATOR = new LinearInterpolator(); private FrameLayout mInnerLayout; protected final ImageView mHeaderImage; protected final ProgressWheel mHeaderProgressWheel; private boolean mUseIntrinsicAnimation; private final TextView mHeaderText; private final TextView mSubHeaderText; protected final Mode mMode; protected final Orientation mScrollDirection; private CharSequence mPullLabel; private CharSequence mRefreshingLabel; private CharSequence mReleaseLabel; public LoadingLayout(Context context, final Mode mode, final Orientation scrollDirection, TypedArray attrs) { super(context); mMode = mode; mScrollDirection = scrollDirection; switch (scrollDirection) { case HORIZONTAL: LayoutInflater.from(context).inflate(R.layout.pull2load_header_horizontal, this); break; case VERTICAL: default: LayoutInflater.from(context).inflate(R.layout.pull2load_header_vertical, this); break; } mInnerLayout = (FrameLayout) findViewById(R.id.fl_inner); mHeaderText = (TextView) mInnerLayout.findViewById(R.id.pull_to_refresh_text); mHeaderProgressWheel = (ProgressWheel) mInnerLayout.findViewById(R.id.pull_to_refresh_progress_wheel); mSubHeaderText = (TextView) mInnerLayout.findViewById(R.id.pull_to_refresh_sub_text); mHeaderImage = (ImageView) mInnerLayout.findViewById(R.id.pull_to_refresh_image); LayoutParams lp = (LayoutParams) mInnerLayout.getLayoutParams(); switch (mode) { case PULL_FROM_END: lp.gravity = scrollDirection == Orientation.VERTICAL ? Gravity.TOP : Gravity.LEFT; // Load in labels mPullLabel = context.getString(R.string.pull_to_refresh_from_bottom_pull_label); mRefreshingLabel = context.getString(R.string.pull_to_refresh_from_bottom_refreshing_label); mReleaseLabel = context.getString(R.string.pull_to_refresh_from_bottom_release_label); break; case PULL_FROM_START: default: lp.gravity = scrollDirection == Orientation.VERTICAL ? Gravity.BOTTOM : Gravity.RIGHT; // Load in labels mPullLabel = context.getString(R.string.pull_to_refresh_pull_label); mRefreshingLabel = context.getString(R.string.pull_to_refresh_refreshing_label); mReleaseLabel = context.getString(R.string.pull_to_refresh_release_label); break; } if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderBackground)) { Drawable background = attrs.getDrawable(R.styleable.PullToRefresh_ptrHeaderBackground); if (null != background) { ViewCompat.setBackground(this, background); } } if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderTextAppearance)) { TypedValue styleID = new TypedValue(); attrs.getValue(R.styleable.PullToRefresh_ptrHeaderTextAppearance, styleID); setTextAppearance(styleID.data); } if (attrs.hasValue(R.styleable.PullToRefresh_ptrSubHeaderTextAppearance)) { TypedValue styleID = new TypedValue(); attrs.getValue(R.styleable.PullToRefresh_ptrSubHeaderTextAppearance, styleID); setSubTextAppearance(styleID.data); } // Text Color attrs need to be set after TextAppearance attrs if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderTextColor)) { ColorStateList colors = attrs.getColorStateList(R.styleable.PullToRefresh_ptrHeaderTextColor); if (null != colors) { setTextColor(colors); } } if (attrs.hasValue(R.styleable.PullToRefresh_ptrHeaderSubTextColor)) { ColorStateList colors = attrs.getColorStateList(R.styleable.PullToRefresh_ptrHeaderSubTextColor); if (null != colors) { setSubTextColor(colors); } } // Try and get defined drawable from Attrs Drawable imageDrawable = null; if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawable)) { imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawable); } // Check Specific Drawable from Attrs, these overrite the generic // drawable attr above switch (mode) { case PULL_FROM_START: default: if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableStart)) { imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableStart); } else if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableTop)) { Pull2LoadCommonUtil.warnDeprecation("ptrDrawableTop", "ptrDrawableStart"); imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableTop); } break; case PULL_FROM_END: if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableEnd)) { imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableEnd); } else if (attrs.hasValue(R.styleable.PullToRefresh_ptrDrawableBottom)) { Pull2LoadCommonUtil.warnDeprecation("ptrDrawableBottom", "ptrDrawableEnd"); imageDrawable = attrs.getDrawable(R.styleable.PullToRefresh_ptrDrawableBottom); } break; } // If we don't have a user defined drawable, load the default if (null == imageDrawable) { imageDrawable = ContextCompat.getDrawable(context, getDefaultDrawableResId()); } // Set Drawable, and save width/height setLoadingDrawable(imageDrawable); reset(); } public final void setHeight(int height) { ViewGroup.LayoutParams lp = getLayoutParams(); lp.height = height; requestLayout(); } public final void setWidth(int width) { ViewGroup.LayoutParams lp = getLayoutParams(); lp.width = width; requestLayout(); } public final int getContentSize() { switch (mScrollDirection) { case HORIZONTAL: return mInnerLayout.getWidth(); case VERTICAL: default: return mInnerLayout.getHeight(); } } public final void hideAllViews() { if (View.VISIBLE == mHeaderText.getVisibility()) { mHeaderText.setVisibility(View.INVISIBLE); } if (View.VISIBLE == mHeaderProgressWheel.getVisibility()) { mHeaderProgressWheel.setVisibility(View.INVISIBLE); } if (View.VISIBLE == mHeaderImage.getVisibility()) { mHeaderImage.setVisibility(View.INVISIBLE); } if (View.VISIBLE == mSubHeaderText.getVisibility()) { mSubHeaderText.setVisibility(View.INVISIBLE); } } public final void onPull(float scaleOfLayout) { if (!mUseIntrinsicAnimation) { onPullImpl(scaleOfLayout); } } public final void pullToRefresh() { if (null != mHeaderText) { mHeaderText.setText(mPullLabel); } // Now call the callback pullToRefreshImpl(); } public final void refreshing() { if (null != mHeaderText) { mHeaderText.setText(mRefreshingLabel); } if (mUseIntrinsicAnimation) { ((AnimationDrawable) mHeaderImage.getDrawable()).start(); } else { // Now call the callback refreshingImpl(); } if (null != mSubHeaderText) { mSubHeaderText.setVisibility(View.GONE); } } public final void releaseToRefresh() { if (null != mHeaderText) { mHeaderText.setText(mReleaseLabel); } // Now call the callback releaseToRefreshImpl(); } public final void reset() { if (null != mHeaderText) { mHeaderText.setText(mPullLabel); } mHeaderImage.setVisibility(View.VISIBLE); if (mUseIntrinsicAnimation) { ((AnimationDrawable) mHeaderImage.getDrawable()).stop(); } else { // Now call the callback resetImpl(); } if (null != mSubHeaderText) { if (TextUtils.isEmpty(mSubHeaderText.getText())) { mSubHeaderText.setVisibility(View.GONE); } else { mSubHeaderText.setVisibility(View.VISIBLE); } } } @Override public void setLastUpdatedLabel(CharSequence label) { setSubHeaderText(label); } public final void setLoadingDrawable(Drawable imageDrawable) { // Set Drawable mHeaderImage.setImageDrawable(imageDrawable); mUseIntrinsicAnimation = (imageDrawable instanceof AnimationDrawable); // Now call the callback onLoadingDrawableSet(imageDrawable); } public void setPullLabel(CharSequence pullLabel) { mPullLabel = pullLabel; } public void setRefreshingLabel(CharSequence refreshingLabel) { mRefreshingLabel = refreshingLabel; } public void setReleaseLabel(CharSequence releaseLabel) { mReleaseLabel = releaseLabel; } @Override public void setTextTypeface(Typeface tf) { mHeaderText.setTypeface(tf); } public final void showInvisibleViews() { if (View.INVISIBLE == mHeaderText.getVisibility()) { mHeaderText.setVisibility(View.VISIBLE); } if (View.INVISIBLE == mHeaderProgressWheel.getVisibility()) { mHeaderProgressWheel.setVisibility(View.VISIBLE); } if (View.INVISIBLE == mHeaderImage.getVisibility()) { mHeaderImage.setVisibility(View.VISIBLE); } if (View.INVISIBLE == mSubHeaderText.getVisibility()) { mSubHeaderText.setVisibility(View.VISIBLE); } } /** * Callbacks for derivative Layouts */ protected abstract int getDefaultDrawableResId(); protected abstract void onLoadingDrawableSet(Drawable imageDrawable); protected abstract void onPullImpl(float scaleOfLayout); protected abstract void pullToRefreshImpl(); protected abstract void refreshingImpl(); protected abstract void releaseToRefreshImpl(); protected abstract void resetImpl(); private void setSubHeaderText(CharSequence label) { if (null != mSubHeaderText) { if (TextUtils.isEmpty(label)) { mSubHeaderText.setVisibility(View.GONE); } else { mSubHeaderText.setText(label); // Only set it to Visible if we're GONE, otherwise VISIBLE will // be set soon if (View.GONE == mSubHeaderText.getVisibility()) { mSubHeaderText.setVisibility(View.VISIBLE); } } } } private void setSubTextAppearance(int value) { if (null != mSubHeaderText) { mSubHeaderText.setTextAppearance(getContext(), value); } } private void setSubTextColor(ColorStateList color) { if (null != mSubHeaderText) { mSubHeaderText.setTextColor(color); } } private void setTextAppearance(int value) { if (null != mHeaderText) { mHeaderText.setTextAppearance(getContext(), value); } if (null != mSubHeaderText) { mSubHeaderText.setTextAppearance(getContext(), value); } } private void setTextColor(ColorStateList color) { if (null != mHeaderText) { mHeaderText.setTextColor(color); } if (null != mSubHeaderText) { mSubHeaderText.setTextColor(color); } } }