android自定义下载进度弹窗

使用的系统默认的progressdialog显示如下：

ProgressDialog progressDialog = new ProgressDialog(this);
        progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        // 设置ProgressDialog 标题
        progressDialog.setTitle("下载提示");
        // 设置ProgressDialog 提示信息
        progressDialog.setMessage("当前下载进度:");
        // 设置ProgressDialog 是否可以按退回按键取消
        progressDialog.setCancelable(true);
        progressDialog.show();
        progressDialog.setMax(18268544);
        progressDialog.setProgress(1866954);

Paste_Image.png

现在需要显示文件总大小和当前进度，以M为单位。
效果如下：

Paste_Image.png

代码如下（完全参照系统的progressdialog）

  public class DownloadProgressDialog extends AlertDialog {
    /** Creates a ProgressDialog with a horizontal progress bar.
     */
    public static final int STYLE_HORIZONTAL = 1;
    private String mProgressNumberFormat;
    private NumberFormat mProgressPercentFormat;
    private ProgressBar mProgress;
    private Handler mViewUpdateHandler;
    private TextView mProgressNumber;
    private TextView mProgressPercent;
    private TextView mMessageView;
    private int mProgressStyle = STYLE_SPINNER;
    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;
    protected DownloadProgressDialog(Context context) {
        super(context);
        initFormats();
    }

    protected DownloadProgressDialog(Context context, boolean cancelable, OnCancelListener cancelListener) {
        super(context, cancelable, cancelListener);
        initFormats();
    }

    protected DownloadProgressDialog(Context context, @StyleRes int themeResId) {
        super(context, themeResId);
        initFormats();
    }
    private void initFormats() {
        mProgressNumberFormat = "%1.2fM/%2.2fM";
        mProgressPercentFormat = NumberFormat.getPercentInstance();
        mProgressPercentFormat.setMaximumFractionDigits(0);
    }
    public static DownloadProgressDialog show(Context context, CharSequence title,
                                      CharSequence message) {
        return show(context, title, message, false);
    }

    public static DownloadProgressDialog show(Context context, CharSequence title,
                                      CharSequence message, boolean indeterminate) {
        return show(context, title, message, indeterminate, false, null);
    }

    public static DownloadProgressDialog show(Context context, CharSequence title,
                                      CharSequence message, boolean indeterminate, boolean cancelable) {
        return show(context, title, message, indeterminate, cancelable, null);
    }

    public static DownloadProgressDialog show(Context context, CharSequence title,
                                      CharSequence message, boolean indeterminate,
                                      boolean cancelable, OnCancelListener cancelListener) {
        DownloadProgressDialog dialog = new DownloadProgressDialog(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(getContext());
        if (mProgressStyle == STYLE_HORIZONTAL) {
            mViewUpdateHandler = new Handler() {
                @Override
                public void handleMessage(Message msg) {
                    super.handleMessage(msg);
                    /* Update the number and percent */
                    double progress =(double) mProgress.getProgress()/(double)(1024*1024);
                    double max = (double)mProgress.getMax()/(double)(1024*1024);
                    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(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(R.layout.progress_dialog, null);
            mProgress = (ProgressBar) view.findViewById(R.id.progress);
            mMessageView = (TextView) view.findViewById(R.id.message);
            setView(view);
        }
        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);
            }
        }
    }
}

布局文件alert_dialog_progress

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content" android:layout_height="match_parent">
    <ProgressBar android:id="@+id/progress"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="12dip"
        android:layout_marginBottom="1dip"
        android:layout_marginStart="10dip"
        android:layout_marginEnd="10dip"
        android:layout_centerHorizontal="true" />
    <TextView
        android:id="@+id/progress_percent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingBottom="12dip"
        android:layout_marginStart="10dip"
        android:layout_marginEnd="10dip"
        android:layout_alignParentStart="true"
        android:layout_below="@id/progress"
        android:layout_alignParentLeft="true" />
    <TextView
        android:id="@+id/progress_number"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:paddingBottom="12dip"
        android:layout_marginStart="10dip"
        android:layout_marginEnd="10dip"
        android:layout_alignParentEnd="true"
        android:layout_below="@id/progress"
        android:layout_alignParentRight="true" />
</RelativeLayout>

progress_dialog

  <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <LinearLayout android:id="@+id/body"
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:baselineAligned="false"
        android:paddingStart="8dip"
        android:paddingTop="10dip"
        android:paddingEnd="8dip"
        android:paddingBottom="10dip">

        <ProgressBar android:id="@android:id/progress"
            style="?android:attr/progressBarStyle"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:max="10000"
            android:layout_marginEnd="12dip"
            android:layout_marginRight="12dip" />

        <TextView android:id="@+id/message"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical" />
    </LinearLayout>
</FrameLayout>

使用方法和progressdialog完全一下：

   DownloadProgressDialog progressDialog = new DownloadProgressDialog(this);
        progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        // 设置ProgressDialog 标题
        progressDialog.setTitle("下载提示");
        // 设置ProgressDialog 提示信息
        progressDialog.setMessage("当前下载进度:");
        // 设置ProgressDialog 标题图标
        //progressDialog.setIcon(R.drawable.a);
        // 设置ProgressDialog 进度条进度
        // 设置ProgressDialog 的进度条是否不明确
        progressDialog.setIndeterminate(false);
        // 设置ProgressDialog 是否可以按退回按键取消
        progressDialog.setCancelable(true);
        progressDialog.show();
        progressDialog.setMax(18268544);
        progressDialog.setProgress(1866954);