Java tutorial
package android.support.v4.app; /* * Copyright (C) 2007 The Android Open Source Project * 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. */ import java.text.NumberFormat; import android.content.Context; import android.content.res.TypedArray; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.support.v4.preferencefragment.R; import android.text.Spannable; import android.text.SpannableString; import android.text.style.StyleSpan; import android.view.LayoutInflater; import android.view.View; import android.widget.ProgressBar; import android.widget.TextView; /** * <p> * A dialog showing a progress indicator and an optional text message or view. Only a text message * or a view can be used at the same time. * </p> * <p> * The dialog can be made cancelable on back key press. * </p> * <p> * The progress range is 0..10000. * </p> */ public class ProgressDialog extends AlertDialog { /** * Creates a ProgressDialog with a circular, spinning progress * bar. This is the default. */ public static final int STYLE_SPINNER = 0; /** * Creates a ProgressDialog with a horizontal progress bar. */ public static final int STYLE_HORIZONTAL = 1; private ProgressBar mProgress; private TextView mMessageView; private int mProgressStyle = STYLE_SPINNER; private TextView mProgressNumber; private String mProgressNumberFormat; private TextView mProgressPercent; private NumberFormat mProgressPercentFormat; private int mMax; private int mProgressVal; private int mSecondaryProgressVal; private int mIncrementBy; private int mIncrementSecondaryBy; private Drawable mProgressDrawable; private Drawable mIndeterminateDrawable; private CharSequence mMessage; private boolean mIndeterminate; private boolean mHasStarted; private Handler mViewUpdateHandler; public ProgressDialog(Context context) { super(context); initFormats(); } public ProgressDialog(Context context, int theme) { super(context, theme); initFormats(); } private void initFormats() { mProgressNumberFormat = "%1d/%2d"; mProgressPercentFormat = NumberFormat.getPercentInstance(); mProgressPercentFormat.setMaximumFractionDigits(0); } public static ProgressDialog show(Context context, CharSequence title, CharSequence message) { return show(context, title, message, false); } public static ProgressDialog show(Context context, CharSequence title, CharSequence message, boolean indeterminate) { return show(context, title, message, indeterminate, false, null); } public static ProgressDialog show(Context context, CharSequence title, CharSequence message, boolean indeterminate, boolean cancelable) { return show(context, title, message, indeterminate, cancelable, null); } public static ProgressDialog show(Context context, CharSequence title, CharSequence message, boolean indeterminate, boolean cancelable, OnCancelListener cancelListener) { ProgressDialog dialog = new ProgressDialog(context); dialog.setTitle(title); dialog.setMessage(message); dialog.setIndeterminate(indeterminate); dialog.setCancelable(cancelable); dialog.setOnCancelListener(cancelListener); dialog.show(); return dialog; } @Override protected void onCreate(Bundle savedInstanceState) { LayoutInflater inflater = LayoutInflater.from(mContext); TypedArray a = mContext.obtainStyledAttributes(null, R.styleable.AlertDialog, R.attr.alertDialogStyle, 0); if (mProgressStyle == STYLE_HORIZONTAL) { /* * Use a separate handler to update the text views as they * must be updated on the same thread that created them. */ mViewUpdateHandler = new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); /* Update the number and percent */ int progress = mProgress.getProgress(); int max = mProgress.getMax(); if (mProgressNumberFormat != null) { String format = mProgressNumberFormat; mProgressNumber.setText(String.format(format, progress, max)); } else { mProgressNumber.setText(""); } if (mProgressPercentFormat != null) { double percent = (double) progress / (double) max; SpannableString tmp = new SpannableString(mProgressPercentFormat.format(percent)); tmp.setSpan(new StyleSpan(android.graphics.Typeface.BOLD), 0, tmp.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); mProgressPercent.setText(tmp); } else { mProgressPercent.setText(""); } } }; View view = inflater.inflate(a.getResourceId(R.styleable.AlertDialog_horizontalProgressLayout, R.layout.alert_dialog_progress), null); mProgress = (ProgressBar) view.findViewById(R.id.progress); mProgressNumber = (TextView) view.findViewById(R.id.progress_number); mProgressPercent = (TextView) view.findViewById(R.id.progress_percent); setView(view); } else { View view = inflater.inflate( a.getResourceId(R.styleable.AlertDialog_progressLayout, R.layout.progress_dialog), null); mProgress = (ProgressBar) view.findViewById(R.id.progress); mMessageView = (TextView) view.findViewById(R.id.message); setView(view); } a.recycle(); if (mMax > 0) { setMax(mMax); } if (mProgressVal > 0) { setProgress(mProgressVal); } if (mSecondaryProgressVal > 0) { setSecondaryProgress(mSecondaryProgressVal); } if (mIncrementBy > 0) { incrementProgressBy(mIncrementBy); } if (mIncrementSecondaryBy > 0) { incrementSecondaryProgressBy(mIncrementSecondaryBy); } if (mProgressDrawable != null) { setProgressDrawable(mProgressDrawable); } if (mIndeterminateDrawable != null) { setIndeterminateDrawable(mIndeterminateDrawable); } if (mMessage != null) { setMessage(mMessage); } setIndeterminate(mIndeterminate); onProgressChanged(); super.onCreate(savedInstanceState); } @Override public void onStart() { super.onStart(); mHasStarted = true; } @Override protected void onStop() { super.onStop(); mHasStarted = false; } public void setProgress(int value) { if (mHasStarted) { mProgress.setProgress(value); onProgressChanged(); } else { mProgressVal = value; } } public void setSecondaryProgress(int secondaryProgress) { if (mProgress != null) { mProgress.setSecondaryProgress(secondaryProgress); onProgressChanged(); } else { mSecondaryProgressVal = secondaryProgress; } } public int getProgress() { if (mProgress != null) { return mProgress.getProgress(); } return mProgressVal; } public int getSecondaryProgress() { if (mProgress != null) { return mProgress.getSecondaryProgress(); } return mSecondaryProgressVal; } public int getMax() { if (mProgress != null) { return mProgress.getMax(); } return mMax; } public void setMax(int max) { if (mProgress != null) { mProgress.setMax(max); onProgressChanged(); } else { mMax = max; } } public void incrementProgressBy(int diff) { if (mProgress != null) { mProgress.incrementProgressBy(diff); onProgressChanged(); } else { mIncrementBy += diff; } } public void incrementSecondaryProgressBy(int diff) { if (mProgress != null) { mProgress.incrementSecondaryProgressBy(diff); onProgressChanged(); } else { mIncrementSecondaryBy += diff; } } public void setProgressDrawable(Drawable d) { if (mProgress != null) { mProgress.setProgressDrawable(d); } else { mProgressDrawable = d; } } public void setIndeterminateDrawable(Drawable d) { if (mProgress != null) { mProgress.setIndeterminateDrawable(d); } else { mIndeterminateDrawable = d; } } public void setIndeterminate(boolean indeterminate) { if (mProgress != null) { mProgress.setIndeterminate(indeterminate); } else { mIndeterminate = indeterminate; } } public boolean isIndeterminate() { if (mProgress != null) { return mProgress.isIndeterminate(); } return mIndeterminate; } @Override public void setMessage(CharSequence message) { if (mProgress != null) { if (mProgressStyle == STYLE_HORIZONTAL) { super.setMessage(message); } else { mMessageView.setText(message); } } else { mMessage = message; } } public void setProgressStyle(int style) { mProgressStyle = style; } /** * Change the format of the small text showing current and maximum units * of progress. The default is "%1d/%2d". * Should not be called during the number is progressing. * * @param format * A string passed to {@link String#format String.format()}; * use "%1d" for the current number and "%2d" for the maximum. If null, * nothing will be shown. */ public void setProgressNumberFormat(String format) { mProgressNumberFormat = format; onProgressChanged(); } /** * Change the format of the small text showing the percentage of progress. * The default is {@link NumberFormat#getPercentInstance() * NumberFormat.getPercentageInstnace().} Should not be called during the number is progressing. * * @param format * An instance of a {@link NumberFormat} to generate the * percentage text. If null, nothing will be shown. */ public void setProgressPercentFormat(NumberFormat format) { mProgressPercentFormat = format; onProgressChanged(); } private void onProgressChanged() { if (mProgressStyle == STYLE_HORIZONTAL) { if (mViewUpdateHandler != null && !mViewUpdateHandler.hasMessages(0)) { mViewUpdateHandler.sendEmptyMessage(0); } } } }