目前我正在开发一个基于自定义键盘的应用程序。基本上，我有一个带有和编辑文本的布局和一个带有键盘布局的辅助 xml。该应用程序应该启动，隐藏默认键盘并显示自定义键盘。
几天前我完成了这个应用程序，我正在用 2.1 2.2 和 2.3 的 AVD 测试它，它们都像魅力一样工作！
之后我决定在实际设备上尝试，但自定义键盘不起作用，所以我调试了它。为键设置 onclick 侦听器时会出现问题，它们都抛出 nullPointerException。
真正让我感到困惑的是，它在 AVD 上完美运行，也为 AVD 调试了它，根本没有 nullPointerException。
这是正常的吗？
代码如下：
public class Main extends Activity implements OnTouchListener, OnClickListener,
OnFocusChangeListener {
private EditText mEt;
private Button mBSpace, mBack, mBorrar;
private RelativeLayout mLayout, mKLayout;
private boolean isEdit = true;
private int w, mWindowWidth;
private String cL[] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9",
"A", "B", "C", "D", "E", "F", "G", "H", "I", "J",
"K", "L", "M", "N", "Ñ", "O", "P", "Q", "R", "S", "T", "U", "V", "W",
"X", "Y", "Z", ".", "?", "!"};
private Button mB[] = new Button[40];
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
try {
setContentView(R.layout.main);
setKeys(); //get ids from xml and setOnClickListeners for every button.
mEt = (EditText) findViewById(R.id.xEt);
mEt.setOnTouchListener(this);
mEt.setOnFocusChangeListener(this);
mEt.setOnClickListener(this);
mLayout = (RelativeLayout) findViewById(R.id.xK1);
mKLayout = (RelativeLayout) findViewById(R.id.xKeyBoard);
hideDefaultKeyboard(); //abrir teclado al prender app
enableKeyboard();
changeCapitalLetters();
changeCapitalTags();
} catch (Exception e) {
Log.w(getClass().getName(), e.toString());
}
}
@Override
public boolean onTouch(View v, MotionEvent event) {
if (v == mEt) {
hideDefaultKeyboard();
enableKeyboard();
}
return true;
}
@Override
public void onClick(View v) {
if (v != mBack && v != mBorrar) {
addText(v);
} else if (v != mBorrar && v == mBack) {
isBack(v);
} else if (v != mBack && v == mBorrar) {
isBorrar(v);
}
}
@Override
public void onFocusChange(View v, boolean hasFocus) {
if (v == mEt && hasFocus == true) {
isEdit = true;
}
}
private void addText(View v) {
if (isEdit == true) {
String b = "";
b = (String) v.getTag();
if (b != null) {
// adding text in Edittext
mEt.append(b);
}
}
}
private void isBack(View v) {
if (isEdit == true) {
CharSequence cc = mEt.getText();
if (cc != null && cc.length() > 0) {
{
mEt.setText("");
mEt.append(cc.subSequence(0, cc.length() - 1));
}
}
}
}
private void isBorrar(View v) {
if (isEdit == true) {
CharSequence cc = mEt.getText();
if (cc != null && cc.length() > 0) {
{
mEt.setText("");
}
}
}
}
private void changeCapitalLetters() {
for (int i = 0; i < cL.length; i++)
mB[i].setText(cL[i]);
}
private void changeCapitalTags() {
for (int i = 0; i < cL.length; i++)
mB[i].setTag(cL[i]);
}
// enabling customized keyboard
private void enableKeyboard() {
mLayout.setVisibility(RelativeLayout.VISIBLE);
mKLayout.setVisibility(RelativeLayout.VISIBLE);
}
// Disable customized keyboard
private void disableKeyboard() {
mLayout.setVisibility(RelativeLayout.INVISIBLE);
mKLayout.setVisibility(RelativeLayout.INVISIBLE);
}
private void hideDefaultKeyboard() {
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(mEt.getWindowToken(), 0);
//imm.hideSoftInputFromWindow(mKLayout.getApplicationWindowToken(), 0);
}
//get ids del xml y setOnClickListeners
private void setKeys() {
mWindowWidth = getWindowManager().getDefaultDisplay().getWidth();
mB[0] = (Button) findViewById(R.id.xCero);
mB[1] = (Button) findViewById(R.id.xUno);
mB[2] = (Button) findViewById(R.id.xDos);
mB[3] = (Button) findViewById(R.id.xTres);
mB[4] = (Button) findViewById(R.id.xCuatro);
mB[5] = (Button) findViewById(R.id.xCinco);
mB[6] = (Button) findViewById(R.id.xSeis);
mB[7] = (Button) findViewById(R.id.xSiete);
mB[8] = (Button) findViewById(R.id.xOcho);
mB[9] = (Button) findViewById(R.id.xNueve);
mB[10] = (Button) findViewById(R.id.xA);
mB[11] = (Button) findViewById(R.id.xB);
mB[12] = (Button) findViewById(R.id.xC);
mB[13] = (Button) findViewById(R.id.xD);
mB[14] = (Button) findViewById(R.id.xE);
mB[15] = (Button) findViewById(R.id.xF);
mB[16] = (Button) findViewById(R.id.xG);
mB[17] = (Button) findViewById(R.id.xH);
mB[18] = (Button) findViewById(R.id.xI);
mB[19] = (Button) findViewById(R.id.xJ);
mB[20] = (Button) findViewById(R.id.xK);
mB[21] = (Button) findViewById(R.id.xL);
mB[22] = (Button) findViewById(R.id.xM);
mB[23] = (Button) findViewById(R.id.xN);
mB[24] = (Button) findViewById(R.id.xENIE);
mB[25] = (Button) findViewById(R.id.xO);
mB[26] = (Button) findViewById(R.id.xP);
mB[27] = (Button) findViewById(R.id.xQ);
mB[28] = (Button) findViewById(R.id.xR);
mB[29] = (Button) findViewById(R.id.xS);
mB[30] = (Button) findViewById(R.id.xT);
mB[31] = (Button) findViewById(R.id.xU);
mB[32] = (Button) findViewById(R.id.xV);
mB[33] = (Button) findViewById(R.id.xW);
mB[34] = (Button) findViewById(R.id.xX);
mB[35] = (Button) findViewById(R.id.xY);
mB[36] = (Button) findViewById(R.id.xZ);
mB[37] = (Button) findViewById(R.id.xPUNTO);
mB[38] = (Button) findViewById(R.id.xPREGUNTA);
mB[39] = (Button) findViewById(R.id.xEXCLAMACION);
mBorrar = (Button) findViewById(R.id.xBorrar);
mBSpace = (Button) findViewById(R.id.xSpace);
mBack = (Button) findViewById(R.id.xBack);
for (int i = 0; i < mB.length; i++)
mB[i].setOnClickListener(this);
mBorrar.setOnClickListener(this);
mBSpace.setOnClickListener(this);
mBack.setOnClickListener(this);
}
}
和布局文件：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:id="@+id/xMLayout"
android:background="#000000" android:layout_height="fill_parent"
android:focusable="true"><!-- android:orientation="vertical" -->
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:id="@+id/xsubLayout"
android:keepScreenOn="true"
android:layout_height="fill_parent"><!-- android:orientation="vertical" -->
<EditText android:id="@+id/xEt" android:layout_width="fill_parent"
android:focusableInTouchMode="true" android:layout_height="wrap_content" />
<!--<EditText android:id="@+id/et1" android:layout_width="fill_parent"
android:layout_below="@+id/xEt" android:layout_height="wrap_content" />-->
</RelativeLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:id="@+id/xK1"
android:layout_height="wrap_content"
android:visibility="gone"> <!-- android:orientation="vertical" -->
<include android:id="@+id/xKeyBoard" layout="@layout/keyboard"></include>
</RelativeLayout>
键盘布局文件：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/hebrwKeyboardView" android:layout_width="fill_parent"
android:layout_alignParentBottom="true" android:layout_below="@+id/xsubLayout"
android:orientation="vertical" android:background="#252625"
android:visibility="visible" android:layout_height="225sp">
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="225sp"
android:orientation="vertical" android:layout_alignParentBottom="true"
android:clipChildren="true">
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content" android:layout_height="225sp"
android:padding="0sp">
<TableRow android:layout_width="fill_parent"
android:layout_height="fill_parent" android:padding="0sp">
<LinearLayout android:baselineAligned="true"
android:layout_width="fill_parent" android:layout_height="45sp"
android:fitsSystemWindows="true">
<Button android:soundEffectsEnabled="true" android:id="@+id/xCero"
android:layout_width="32sp" android:layout_height="fill_parent"
android:text="0" android:textColor="#000" android:tag="0"
android:padding="0sp" android:textStyle="bold" android:layout_gravity="center"/>
<Button android:soundEffectsEnabled="true" android:id="@+id/xUno"
android:layout_width="32sp" android:layout_height="fill_parent"
android:padding="0sp" android:textColor="#000" android:tag="1"
android:text="1" android:textStyle="bold" android:layout_gravity="center" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xDos"
android:layout_gravity="center" android:layout_width="32sp"
android:padding="0sp" android:layout_height="fill_parent"
android:text="2" android:tag="2" android:textStyle="bold"
android:textColor="#000" android:fitsSystemWindows="true" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xTres"
android:layout_width="32sp" android:layout_gravity="center"
android:layout_height="fill_parent" android:text="3" android:tag="3"
android:textColor="#000" android:textStyle="bold" android:padding="0sp"
android:fitsSystemWindows="true" /><!-- android:ellipsize="marquee" /> -->
<Button android:soundEffectsEnabled="true" android:id="@+id/xCuatro"
android:layout_width="32sp" android:layout_height="fill_parent"
android:layout_gravity="center_horizontal" android:text="4"
android:tag="4" android:fitsSystemWindows="true"
android:textColor="#000" android:textStyle="bold"
android:ellipsize="marquee" android:padding="0sp"/>
<Button android:soundEffectsEnabled="true" android:id="@+id/xCinco"
android:layout_width="32sp" android:layout_height="fill_parent"
android:tag="5" android:layout_gravity="center" android:text="5"
android:fitsSystemWindows="true" android:textColor="#000" android:padding="0sp"
android:textStyle="bold" android:ellipsize="marquee" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xSeis"
android:layout_width="32sp" android:layout_gravity="center_horizontal"
android:layout_height="fill_parent" android:text="6" android:tag="6"
android:textColor="#000" android:textStyle="bold" android:padding="0sp"
android:fitsSystemWindows="true" android:ellipsize="marquee" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xSiete"
android:layout_width="32sp" android:layout_height="fill_parent"
android:text="7" android:fitsSystemWindows="true" android:tag="7"
android:textColor="#000" android:textStyle="bold" android:padding="0sp"
android:layout_gravity="center_horizontal" android:ellipsize="marquee" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xOcho"
android:layout_width="32sp" android:layout_height="fill_parent"
android:text="8" android:fitsSystemWindows="true" android:tag="8"
android:textColor="#000" android:textStyle="bold" android:padding="0sp"
android:layout_gravity="center_horizontal" android:ellipsize="marquee" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xNueve"
android:layout_width="32sp" android:layout_height="fill_parent"
android:textColor="#000" android:textStyle="bold" android:text="9"
android:fitsSystemWindows="true" android:tag="9" android:padding="0sp"
android:layout_gravity="center_horizontal" android:ellipsize="marquee" />
</LinearLayout>
</TableRow>
<TableRow android:layout_width="fill_parent"
android:layout_height="fill_parent" android:padding="0sp">
<LinearLayout android:baselineAligned="true"
android:layout_width="fill_parent" android:layout_height="45sp"
android:fitsSystemWindows="true">
<Button android:soundEffectsEnabled="true" android:id="@+id/xA"
android:layout_width="32sp" android:layout_height="fill_parent"
android:text="A" android:textColor="#000" android:tag="A"
android:padding="0sp" android:textStyle="bold" android:layout_gravity="center"/>
<Button android:soundEffectsEnabled="true" android:id="@+id/xB"
android:layout_width="32sp" android:layout_height="fill_parent"
android:padding="0sp" android:textColor="#000" android:tag="B"
android:text="B" android:textStyle="bold" android:layout_gravity="center" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xC"
android:layout_gravity="center" android:layout_width="32sp"
android:padding="0sp" android:layout_height="fill_parent"
android:text="C" android:tag="C" android:textStyle="bold"
android:textColor="#000" android:fitsSystemWindows="true" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xD"
android:layout_width="32sp" android:layout_gravity="center"
android:layout_height="fill_parent" android:text="D" android:tag="D"
android:textColor="#000" android:textStyle="bold" android:padding="0sp"
android:fitsSystemWindows="true" /><!-- android:ellipsize="marquee" /> -->
<Button android:soundEffectsEnabled="true" android:id="@+id/xE"
android:layout_width="32sp" android:layout_height="fill_parent"
android:layout_gravity="center_horizontal" android:text="E"
android:tag="E" android:fitsSystemWindows="true"
android:textColor="#000" android:textStyle="bold"
android:ellipsize="marquee" android:padding="0sp"/>
<Button android:soundEffectsEnabled="true" android:id="@+id/xF"
android:layout_width="32sp" android:layout_height="fill_parent"
android:tag="F" android:layout_gravity="center" android:text="F"
android:fitsSystemWindows="true" android:textColor="#000" android:padding="0sp"
android:textStyle="bold" android:ellipsize="marquee" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xG"
android:layout_width="32sp" android:layout_gravity="center_horizontal"
android:layout_height="fill_parent" android:text="G" android:tag="G"
android:textColor="#000" android:textStyle="bold" android:padding="0sp"
android:fitsSystemWindows="true" android:ellipsize="marquee" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xH"
android:layout_width="32sp" android:layout_height="fill_parent"
android:text="H" android:fitsSystemWindows="true" android:tag="H"
android:textColor="#000" android:textStyle="bold" android:padding="0sp"
android:layout_gravity="center_horizontal" android:ellipsize="marquee" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xI"
android:layout_width="32sp" android:layout_height="fill_parent"
android:text="I" android:fitsSystemWindows="true" android:tag="I"
android:textColor="#000" android:textStyle="bold" android:padding="0sp"
android:layout_gravity="center_horizontal" android:ellipsize="marquee" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xJ"
android:layout_width="32sp" android:layout_height="fill_parent"
android:textColor="#000" android:textStyle="bold" android:text="J"
android:fitsSystemWindows="true" android:tag="J" android:padding="0sp"
android:layout_gravity="center_horizontal" android:ellipsize="marquee" />
</LinearLayout>
</TableRow>
...
...
<TableRow android:layout_width="fill_parent"
android:layout_height="fill_parent" android:fitsSystemWindows="true"
android:orientation="horizontal">
<LinearLayout android:layout_width="fill_parent"
android:layout_height="45sp" android:gravity="bottom"
android:orientation="horizontal">
<Button android:soundEffectsEnabled="true" android:id="@+id/xBorrar"
android:textColor="#000" android:textStyle="bold"
android:layout_width="115sp" android:layout_height="fill_parent"
android:tag="borrarTodo" android:text="BORRA_TODO" android:fitsSystemWindows="true" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xSpace"
android:textColor="#000" android:textStyle="bold"
android:layout_width="135sp" android:layout_height="fill_parent"
android:tag=" " android:text="|___ESPACIO___|" android:fitsSystemWindows="true" />
<Button android:soundEffectsEnabled="true" android:id="@+id/xBack"
android:layout_width="70sp" android:layout_height="fill_parent"
android:textColor="#000" android:textStyle="bold" android:tag="back"
android:layout_gravity="center_horizontal|center_vertical|center"
android:fitsSystemWindows="true" android:text="BORRA" />
</LinearLayout>
</TableRow>
</TableLayout>
</TableLayout>
该应用程序基于我从以下网址下载的示例：http: //tutorials-android.blogspot.com/2011/06/create-your-own-custom-keyboard-for.html
任何帮助都会很棒，我不知道现在还能尝试什么......