import com.googlecode.eyesfree.braille.selfbraille.WriteData; //导入依赖的package包/类
@Override
public void write(IBinder clientToken, WriteData writeData) {            
    if (clientToken == null) {
        LogUtils.log(SelfBrailleService.this, Log.ERROR,
                "null client token to write");
        return;
    }
    ServiceUtil serviceUtil = new ServiceUtil(mPackageManager);
    if (!serviceUtil.verifyCaller(Binder.getCallingUid())) {
         LogUtils.log(SelfBrailleService.this, Log.ERROR,
             "non-google signed package try to invoke service, rejected.");
         return;
    }

    if (writeData == null) {
        LogUtils.log(SelfBrailleService.this, Log.ERROR,
                "null writeData to write");
        return;
    }
    LogUtils.log(SelfBrailleService.this, Log.VERBOSE,
            "write %s, %s", writeData.getText(),
            writeData.getAccessibilityNodeInfo());
    try {
        writeData.validate();
    } catch (IllegalStateException ex) {
        LogUtils.log(SelfBrailleService.this, Log.ERROR,
                "Invalid write data: %s", ex);
        return;
    }
    NodeState state = new NodeState();
    state.mClientToken = clientToken;
    state.mWriteData = writeData;
    mHandler.setNodeState(state);
}
 

import com.googlecode.eyesfree.braille.selfbraille.WriteData; //导入依赖的package包/类
public DisplayManager.Content contentForNode(
    AccessibilityNodeInfoCompat node) {
    if (mNodeStates.isEmpty()) {
        return null;
    }
    AccessibilityNodeInfoCompat match =
            AccessibilityNodeInfoUtils.getSelfOrMatchingAncestor(
                this, node, mFilterHaveNodeState);
    if (match == null) {
        return null;
    }
    AccessibilityNodeInfo unwrappedMatch =
            (AccessibilityNodeInfo) match.getInfo();
    WriteData writeData = mNodeStates.get(unwrappedMatch).mWriteData;
    if (writeData == null) {
        return null;
    }
    SpannableStringBuilder sb = new SpannableStringBuilder(
        writeData.getText());
    // NOTE: it is important to use a node returned by the accessibility
    // framework and not a node from a client of this service.
    // The rest of BrailleBack will assume that the node we are adding
    // here is sealed, supports actions etc.
    DisplaySpans.setAccessibilityNode(sb, match);
    int selectionStart = writeData.getSelectionStart();
    if (selectionStart >= 0) {
        int selectionEnd = writeData.getSelectionEnd();
        if (selectionEnd < selectionStart) {
            selectionEnd = selectionStart;
        }
        DisplaySpans.addSelection(sb, selectionStart, selectionEnd);
    }
    return new DisplayManager.Content(sb)
            .setFirstNode(match)
            .setLastNode(match)
            .setPanStrategy(DisplayManager.Content.PAN_CURSOR);
}
 

import com.googlecode.eyesfree.braille.selfbraille.WriteData; //导入依赖的package包/类
private static void sendBrailleText(final View view, final String text, final int selectionStart, final int selectionEnd) {
    AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(view, VIRTUAL_CURSOR_POSITION);
    WriteData data = WriteData.forInfo(info);
    data.setText(text);
    // Set either the focus blink or the current caret position/selection
    data.setSelectionStart(selectionStart);
    data.setSelectionEnd(selectionEnd);
    sSelfBrailleClient.write(data);
}
 

import com.googlecode.eyesfree.braille.selfbraille.WriteData; //导入依赖的package包/类
@JavascriptInterface
@SuppressWarnings("unused")
public void braille(String jsonString) {
    try {
        JSONObject jsonObj = new JSONObject(jsonString);

        WriteData data = WriteData.forView(mView);
        data.setText(jsonObj.getString("text"));
        data.setSelectionStart(jsonObj.getInt("startIndex"));
        data.setSelectionEnd(jsonObj.getInt("endIndex"));
        mSelfBrailleClient.write(data);
    } catch (JSONException ex) {
        Log.w(TAG, "Error parsing JS JSON object", ex);
    }
}