好的，这将使我疯狂。我还是个新手（也许是个白痴）但是这个让我跑来跑去。
我正在尝试通过软按钮（向左，向右，向上）在editText中实现光标控制。从我研究过的，看起来我需要Selection对象中的方法，如moveUp（），moveLeft（），extendUp（）等，但它们都需要一个“text.layout”对象，我不知道如何得到一个。
我是否在正确的轨道上？帮助
答案 0 :(得分：1)
移动文本光标的简单示例：
package connect1.de;
import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.text.method.KeyListener;
import android.util.Log;
import android.view.View;
import android.view.inputmethod.BaseInputConnection;
import android.view.inputmethod.CompletionInfo;
import android.view.inputmethod.ExtractedText;
import android.view.inputmethod.ExtractedTextRequest;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.view.View.OnClickListener;
public class Connection1 extends Activity implements OnClickListener
{
/** Called when the activity is first created. */
private EditText s1 = null;
private EditText s2 = null;
Button button1;
Button button2;
private EditableInputConnection in;
private test1 t1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// dieser Aufruf funktioniert nicht !!
// in = new EditableInputConnection(s1);
setContentView(R.layout.main);
// so hunktioniert der Aufruf ohne Absturz
s1 = (EditText) findViewById(R.id.editText1);
// s2 = (EditText) findViewById(R.id.editText2);
s1.setText("Test Button");
button1 = (Button) findViewById(R.id.button1);
button2 = (Button) findViewById(R.id.button2);
// t1 = new test1(s1);
in = new EditableInputConnection(s1);
// dies bewirkt ein absolutes Verschieben des Textcursors auf Position 10 - 1, 1 zeigt ans Ende der Eingabe
// in.commitText("", 5);
// in = new EditableInputConnection(s1);
// in.commitText("", 7);
button1.setOnClickListener(this);
button2.setOnClickListener(this);
// in.cursor_pos();
}
/*
* Copyright (C) 2007-2008 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.
*/
/*
* Copyright (C) 2007-2008 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.
*/
public void onClick(View v)
{
int pos = 0;
pos = in.cursor_pos();
// wie können die verschiedenen Schaltflächen unterschieden werden
if (v.findViewById(R.id.button2) == findViewById(R.id.button2))
// s1.setText(v.findViewById(R.id.button2) + "");
pos = pos + 2;
// else
// s1.setText("Linke Taste gedrückt");
// für links
// in.commitText("", pos);
// -1 hat auch Wirkung für Linksschritt
in.commitText("", pos );
}
public class test1
{
private final TextView mTextView;
public test1(TextView textview)
{
mTextView = textview;
mTextView.setText("Klasse 1");
}
}
public class EditableInputConnection extends BaseInputConnection
{
private static final boolean DEBUG = false;
private static final String TAG = "EditableInputConnection";
private final TextView mTextView;
public EditableInputConnection(TextView textview)
{
super(textview, true);
mTextView = textview;
// mTextView.setText("Inputconnection");
}
public Editable getEditable()
{
TextView tv = mTextView;
if (tv != null)
{
return tv.getEditableText();
}
return null;
}
public boolean beginBatchEdit()
{
mTextView.beginBatchEdit();
return true;
}
public boolean endBatchEdit()
{
mTextView.endBatchEdit();
return true;
}
public boolean clearMetaKeyStates(int states)
{
final Editable content = getEditable();
if (content == null) return false;
KeyListener kl = mTextView.getKeyListener();
if (kl != null) {
try {
kl.clearMetaKeyState(mTextView, content, states);
} catch (AbstractMethodError e) {
// This is an old listener that doesn't implement the
// new method.
}
}
return true;
}
public boolean commitCompletion(CompletionInfo text)
{
if (DEBUG) Log.v(TAG, "commitCompletion " + text);
mTextView.beginBatchEdit();
mTextView.onCommitCompletion(text);
mTextView.endBatchEdit();
return true;
}
public boolean performEditorAction(int actionCode)
{
if (DEBUG) Log.v(TAG, "performEditorAction " + actionCode);
mTextView.onEditorAction(actionCode);
return true;
}
public boolean performContextMenuAction(int id)
{
if (DEBUG) Log.v(TAG, "performContextMenuAction " + id);
mTextView.beginBatchEdit();
mTextView.onTextContextMenuItem(id);
mTextView.endBatchEdit();
return true;
}
public int cursor_pos()
{
int anzahl = 0;
CharSequence str ;
str = super.getTextBeforeCursor(s1.length(), 0);
// s2.setText(str.length()+ "");
anzahl = str.length();
return anzahl;
}
public ExtractedText getExtractedText(ExtractedTextRequest request, int flags)
{
if (mTextView != null)
{
ExtractedText et = new ExtractedText();
if (mTextView.extractText(request, et)) {
if ((flags&GET_EXTRACTED_TEXT_MONITOR) != 0)
{
// dieser Aufruf funktioniert nicht !!
// mTextView.setExtracting(request);
}
return et;
}
}
return null;
}
public boolean performPrivateCommand(String action, Bundle data)
{
mTextView.onPrivateIMECommand(action, data);
return true;
}
@Override
public boolean commitText(CharSequence text, int newCursorPosition)
{
// notwendig, da sonst Eingabetext für Inputmethode nicht aktualisiert wird!!
mTextView.setText(s1.getText());
if (mTextView == null)
{
return super.commitText(text, newCursorPosition);
}
CharSequence errorBefore = mTextView.getError();
// mTextView.setText("");
boolean success = super.commitText(text, newCursorPosition);
CharSequence errorAfter = mTextView.getError();
if (errorAfter != null && errorBefore == errorAfter)
{
mTextView.setError(null, null);
}
// s2.setText(newCursorPosition + "");
return success;
}
}
}
答案 1 :(得分：0)
听起来你想使用DynamicLayout对象。 （它是text.Layout的派生类之一，另一个是StaticLayout。）