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builder.setTitle("關於印發《省環境監察局關於開展黨的群眾路線教育實踐活動的實施方案》的通知");
然後進入setTitle的方法：
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/**
* Set the title displayed in the {@link Dialog}.
*
* @return This Builder object to allow for chaining of calls to set methods
*/
public Builder setTitle(CharSequence title) {
P.mTitle = title;
return this;
}
好了，它把字符串賦給了對象P，然後再來看看P的類型：
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public static class Builder {
private final AlertController.AlertParams P;
private int mTheme;
/**
* Constructor using a context for this builder and the {@link AlertDialog} it creates.
*/
public Builder(Context context) {
this(context, resolveDialogTheme(context, 0));
}
嗯，從Builder處可以看到P是類型為AlertController.AlertParams的對象。然後再接著看AlertController.AlertParams這個類裏面的屬性(註意：如果妳沒有專門設置過可以查看Android內部類的方法的話，這裏是看不了的，相關設置可以參見：/kf/201311/259006.html)：
好了，進入AlertController.AlertParams類內可以看到該類是屬於AlertController的內部類，以下為該類的部分屬性：
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public static class AlertParams {
public final Context mContext;
public final LayoutInflater mInflater;
public int mIconId = 0;
public Drawable mIcon;
public int mIconAttrId = 0;
public CharSequence mTitle;
好了，所以那個字符串設置時最終會設置到這個類對象的mTitle處，然後接下來就是要查看這個屬性什麽時候被使用了呢：
在內類可以看到該方法使用了該屬性：
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public void apply(AlertController dialog) {
if (mCustomTitleView != null) {
dialog.setCustomTitle(mCustomTitleView);
} else {
if (mTitle != null) {
dialog.setTitle(mTitle);
}
這裏說明mTitle被設置給了AlertController的對象dialog，然後接下來就是尋找這個dialog對象是怎麽被傳入進來的：
通過尋找找到apply該方法的被調用處是：
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/**
* Creates a {@link AlertDialog} with the arguments supplied to this builder. It does not
* {@link Dialog#show()} the dialog. This allows the user to do any extra processing
* before displaying the dialog. Use {@link #show()} if you don't have any other processing
* to do and want this to be created and displayed.
*/
public AlertDialog create() {
final AlertDialog dialog = new AlertDialog(P.mContext, mTheme, false);
P.apply(dialog.mAlert);
dialog.setCancelable(P.mCancelable);
if (P.mCancelable) {
dialog.setCanceledOnTouchOutside(true);
}
dialog.setOnCancelListener(P.mOnCancelListener);
dialog.setOnDismissListener(P.mOnDismissListener);
if (P.mOnKeyListener != null) {
dialog.setOnKeyListener(P.mOnKeyListener);
}
return dialog;
}
該方法位於AlertDialog.Builder的內部，也就是當Builder對象調用create方法時會將AlertController的對象dialog傳入，這裏可以看到是dialog的mAlert屬性，也就是說dialog的mAlert屬性是AlertController的對象。好了，到這裏分析完畢。現在就剩下取出該對象，對該對象進行反射了。
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AlertDialog dialog = builder.create();
try {
Class<?> mAlert = dialog.getClass();
Log.e("sahadev", mAlert.getName());
Field field = mAlert.getDeclaredField("mAlert");
field.setAccessible(true);
Log.e("sahadev", field.getName() + "----" + field.get(dialog));
Field mTitleView = field.get(dialog).getClass().getDeclaredField("mTitleView");
mTitleView.setAccessible(true);
Object AlertController = field.get(dialog);
mTitleView.set(AlertController, new TextView(this));//該方法<span style="font-family:Microsoft YaHei;">沒起作用，不知道為什麽，有大神清楚麽？</span>
dialog.show();
Object obj = mTitleView.get(AlertController);
TextView textView = (TextView) obj;
textView.setSingleLine(false);
} catch (Exception e) {
e.printStackTrace();
}
好了，到了這裏就解決完畢了。