Question

当我在API22上运行我的代码时，它可以正常工作，粘贴＆＃34;测试测试＆＃34;在我发布EditText的应用中所需的AccessibilityEvent。但是当我在API 17上运行它时，它不起作用。它将数据复制到剪辑但无法粘贴。我要求该机制适用于API 16及更高版本。

到目前为止，这是我的代码：

public class MyAccessibilityService extends AccessibilityService {
    @Override
    public void onAccessibilityEvent(AccessibilityEvent event) {
        AccessibilityNodeInfo nodeInf = null;
        AccessibilityNodeInfo nodeInfo = null;
        final int eventType = event.getEventType();
        String eventText = null;
        switch(eventType) {
            case AccessibilityEvent.TYPE_VIEW_CLICKED:
                eventText = "Clicked: ";
                nodeInf = this.getRootInActiveWindow();
                Log.d("AccessibilityNodeInfo", ""+ nodeInf.getChildCount());
                nodeInf.recycle();
                break;
            case AccessibilityEvent.TYPE_VIEW_FOCUSED:
                AccessibilityRecordCompat record = AccessibilityEventCompat.asRecord(event);
                AccessibilityNodeInfoCompat source = record.getSource();

                ClipboardManager clipboard = (ClipboardManager) this.getSystemService(Context.CLIPBOARD_SERVICE);
                ClipData clip = ClipData.newPlainText("label", "TESTING TESTING");
                clipboard.setPrimaryClip(clip);

                source.performAction(AccessibilityNodeInfoCompat.ACTION_PASTE);
                //}

                Log.d("AccessibilityNodeInfo", ""+ source.getClassName());
                Intent intent = new Intent(MyAccessibilityService.this, TestActivity.class);
                intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                intent.addFlags(Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
                startActivity(intent);
                break;
        }


        eventText = eventText + event.getText();

        // Do something nifty with this text, like speak the composed string
        // back to the user.
        Log.d("Information", eventText);
        Toast.makeText(getApplicationContext(), eventText + " " + android.os.Build.VERSION.SDK_INT,
                Toast.LENGTH_LONG).show();
    }
}

Answer 1

不幸的是，在API级别18中添加了AccessibilityNodeInfo.ACTION_PASTE，因此它无法使用API 17及更低版本。 AccessibilityNodeInfoCompat只是现有功能的包装器，它不提供缺少功能的自定义实现。

v4支持库的来源非常清楚：

当您在performAction中致电AccessibilityNodeInfoCompat时，支持图书馆会调用IMPL.performAction [1]

public boolean performAction(int action) {
    return IMPL.performAction(mInfo, action);
}

当API级别为16和17时，

IMPL为AccessibilityNodeInfoJellybeanImpl [2]

if (Build.VERSION.SDK_INT >= 22) {
    IMPL = new AccessibilityNodeInfoApi22Impl();
} else if (Build.VERSION.SDK_INT >= 21) {
    IMPL = new AccessibilityNodeInfoApi21Impl();
} else if (Build.VERSION.SDK_INT >= 19) { // KitKat
    IMPL = new AccessibilityNodeInfoKitKatImpl();
} else if (Build.VERSION.SDK_INT >= 18) { // JellyBean MR2
    IMPL = new AccessibilityNodeInfoJellybeanMr2Impl();
} else if (Build.VERSION.SDK_INT >= 16) { // JellyBean
    IMPL = new AccessibilityNodeInfoJellybeanImpl();
} else if (Build.VERSION.SDK_INT >= 14) { // ICS
    IMPL = new AccessibilityNodeInfoIcsImpl();
} else {
    IMPL = new AccessibilityNodeInfoStubImpl();
}

这是performAction [3]

中的AccessibilityNodeInfoJellybeanImpl

public static boolean performAction(Object info, int action, Bundle arguments) {
    return ((AccessibilityNodeInfo) info).performAction(action, arguments);
}

正如您所见，支持库会调用标准performAction的{{1}}，因此，如果系统不支持android.view.accessibility.AccessibilityNodeInfo，则v4支持库也不会支持ACTION_PASTE。 t支持ACTION_PASTE。

您可以检查此代码是否支持ACTION_PASTE：

AccessibilityNodeInfoCompat source = record.getSource();
int supportedActions = source.getActions();
boolean isSupported = (supportedActions & AccessibilityNodeInfoCompat.ACTION_PASTE) == AccessibilityNodeInfoCompat.ACTION_PASTE;
Log.d(TAG, String.format("AccessibilityNodeInfoCompat.ACTION_PASTE %1$s supported", isSupported ? "is" : "is NOT"));

Answer 2

也许你应该改进你的答案并添加一些关于你的进口的更多细节。

<强>粘贴：正如您在评论中提到的，它更多的是再次从剪贴板中获取该东西？

从Android Copy and Paste Documentation 开始，你可以像这样的文字获取复制的内容：

// Examines the item on the clipboard. If getText() does not return null, the clip item contains the
// text. Assumes that this application can only handle one item at a time.
 ClipData.Item item = clipboard.getPrimaryClip().getItemAt(0);

// Gets the clipboard as text.
pasteData = item.getText();

// If the string contains data, then the paste operation is done
if (pasteData != null) {
    return;

// The clipboard does not contain text. If it contains a URI, attempts to get data from it
} else {
    Uri pasteUri = item.getUri();

    // If the URI contains something, try to get text from it
    if (pasteUri != null) {

        // calls a routine to resolve the URI and get data from it. This routine is not
        // presented here.
        pasteData = resolveUri(Uri);
        return;
    } else {

    // Something is wrong. The MIME type was plain text, but the clipboard does not contain either
    // text or a Uri. Report an error.
    Log.e("Clipboard contains an invalid data type");
    return;
    }
}

<强>复制：

ClipBoardManager有两种不同的变体。 Honeycomb推出了新款产品。您必须确保您的代码使用了正确的变体。

看看这段代码示例：

int sdk = android.os.Build.VERSION.SDK_INT;
if(sdk < android.os.Build.VERSION_CODES.HONEYCOMB) {
    android.text.ClipboardManager clipboard = (android.text.ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE);
    clipboard.setText("text to clip");
} else {
    android.content.ClipboardManager clipboard = (android.content.ClipboardManager) getSystemService(Context.CLIPBOARD_SERVICE); 
    android.content.ClipData clip = android.content.ClipData.newPlainText("text label","text to clip");
    clipboard.setPrimaryClip(clip);
}

这只是一个假设，因为这个问题错过了一些信息。

来自API22的AccessibilityService工作的粘贴在API17中不起作用

2 个答案: