下面的代码在Kotlin / Android中崩溃,底部提供了堆栈跟踪。它是从Java / Android转换而来的,并没有出现这样的问题。还提供了原始Java代码。当我尝试将字符添加到密码字段时发生崩溃。编辑现有字符效果很好。
我有两个问题:
Kotlin代码崩溃了Android的Paint
mPwd!!.transformationMethod = object : PasswordTransformationMethod() {
override fun getTransformation(source: CharSequence, view: View): CharSequence {
return PasswordCharSequence(source)
}
internal inner class PasswordCharSequence(private val source: CharSequence)// Store char sequence
: CharSequence {
val mSource = source
public override val length = mSource.length
init {
App.d(TAG, "SOURCE " + mSource + " " + length)
}
override fun get(index: Int): Char {
App.d(TAG, "SOURCE IND " + index + " " + mSource.length)
return if (mChkUnmask!!.isChecked) mSource.get(index) else '*'
}
override fun subSequence(start: Int, end: Int): CharSequence {
App.d(TAG, "SOURCE SUB " + start + " " + end)
return mSource.subSequence(start, end) // Return default
}
}
}
完美运行的原始Java代码
mPwd.setTransformationMethod(new PasswordTransformationMethod() {
@Override
public CharSequence getTransformation(CharSequence source, View view) {
return new PasswordCharSequence(source);
}
class PasswordCharSequence implements CharSequence {
private CharSequence mSource;
public PasswordCharSequence(CharSequence source) {
mSource = source; // Store char sequence
}
public char charAt(int index) {
return mChkUnmask.isChecked()?mSource.charAt(index):'*';
}
public int length() {
return mSource.length(); // Return default
}
public CharSequence subSequence(int start, int end) {
return mSource.subSequence(start, end); // Return default
}
}
});
从Logcat堆栈跟踪
06-03 00:35:08.143 16694 16694 E AndroidRuntime: java.lang.IndexOutOfBoundsException
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.graphics.Paint.getRunAdvance(Paint.java:2986)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.text.TextLine.handleText(TextLine.java:719)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.text.TextLine.handleRun(TextLine.java:873)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.text.TextLine.measureRun(TextLine.java:387)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.text.TextLine.measure(TextLine.java:277)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.text.TextLine.metrics(TextLine.java:251)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.text.Layout.getLineExtent(Layout.java:1072)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.text.Layout.getLineWidth(Layout.java:1038)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.widget.TextView.desired(TextView.java:8142)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.widget.TextView.onMeasure(TextView.java:8208)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.view.View.measure(View.java:21051)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.view.View.measure(View.java:21051)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.view.View.measure(View.java:21051)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6459)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:141)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.view.View.measure(View.java:21051)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6459)
06-03 00:35:08.143 16694 16694 E AndroidRuntime: at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:400)
来自Log.d(...)的程序输出
10这里是CharSequence长度。第一位数 - 当前指数。当我尝试从键盘添加索引为9的字符时发生崩溃。它从未被添加,并且没有出现在
下面的输出中06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 810
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 710
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 610
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 510
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 410
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 310
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 210
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 110
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 010
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 010
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 110
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 210
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 310
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 410
06-03 00:35:08.121 16694 16694 D GAC-STORE: SOURCE IND 510
06-03 00:35:08.122 16694 16694 D GAC-STORE: SOURCE IND 610
06-03 00:35:08.122 16694 16694 D GAC-STORE: SOURCE IND 710
06-03 00:35:08.122 16694 16694 D GAC-STORE: SOURCE IND 810
06-03 00:35:08.122 16694 16694 D GAC-STORE: SOURCE IND 010
06-03 00:35:08.122 16694 16694 D GAC-STORE: SOURCE IND 110
06-03 00:35:08.122 16694 16694 D GAC-STORE: SOURCE IND 210
06-03 00:35:08.122 16694 16694 D GAC-STORE: SOURCE IND 310
06-03 00:35:08.122 16694 16694 D GAC-STORE: SOURCE IND 410
06-03 00:35:08.122 16694 16694 D GAC-STORE: SOURCE IND 510
06-03 00:35:08.122 16694 16694 D GAC-STORE: SOURCE IND 610
06-03 00:35:08.122 16694 16694 D GAC-STORE: SOURCE IND 710
06-03 00:35:08.122 16694 16694 D GAC-STORE: SOURCE IND 810
06-03 00:35:08.122 16694 16694 D GAC-STORE: SOURCE IND 810
mPwd的布局
<EditText
android:id="@+id/txtDlgPwd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/chkStorePwd"
android:hint ="Ecnryption Password"
android:maxLines="1"
android:singleLine="true"
android:inputType="textPassword|textNoSuggestions"
android:imeOptions="actionDone"
android:layout_marginLeft="10dp"
android:layout_marginTop="20dp"
android:textSize="15sp"/>
答案 0 :(得分:1)
幸运的是,Android / Kotlin允许在单个项目中混合使用Java和Kotlin文件。我用它来解决这个问题。
为密码处理创建了一个Java类。请注意,CharSequence是一个本地Java类,这有所不同。
import java.lang.CharSequence;
public class PasswordHandler implements CharSequence {
private CharSequence mSource;
private Switch mUnmask;
public PasswordHandler(CharSequence source, Switch unmask) {
mSource = source;
mUnmask = unmask;
}
public char charAt(int index) {
return mUnmask.isChecked()?mSource.charAt(index):'*';
}
public int length() {
return mSource.length();
}
public CharSequence subSequence(int start, int end) {
return mSource.subSequence(start, end);
}
@NonNull
@Override
public String toString() {
String star = new String();
int l = length();
if (!mUnmask.isChecked()) {
while (l-- > 0){
star += "*";
}
}
return mUnmask.isChecked()? mSource.toString():star;
}
}
在Kotlin的类中的getTransfromation方法中实例化此类。 Kotlin编译器这次很好。崩溃不再发生。我仍然希望看到纯粹的Kotlin解决方案。
mPwd!!.transformationMethod = object : PasswordTransformationMethod() {
override fun getTransformation(source: CharSequence, view: View): CharSequence {
return PasswordHandler(source, mChkUnmask)
}
}
答案 1 :(得分:0)
发生这种情况是因为在初始化期间设置了 length
字段。尝试使用 getter。
internal class PasswordCharSequence(private val source: CharSequence) : CharSequence {
override val length: Int
get() = source.length
// Rest implementation
}
答案 2 :(得分:-1)
class CustomPasswordSymbole : PasswordTransformationMethod() {
override fun getTransformation(source: CharSequence?, view: View?): CharSequence {
return PasswordCharSequence(source)
}
class PasswordCharSequence(source: CharSequence?) : CharSequence{
val mSource = source
override val length: Int=6 ///manually enter lenght of your password
override fun get(index: Int): Char {
return '*'
}
override fun subSequence(startIndex: Int, endIndex: Int): CharSequence {
return mSource!!.subSequence(startIndex, endIndex)
}
}
}