下面的代码在 Kotlin/Android 中崩溃,堆栈跟踪位于底部。它是从Java/Android转换而来的,没有这样的问题。还提供了原始 Java 代码。当我尝试向密码字段添加字符时发生崩溃。编辑现有字符效果很好。
我对此有两个问题:
- Kotlin 用 Kotlin 的 CharSequence 替换 java.lang.CharSequence 的动机是什么?这两者有很大不同,我怀疑它导致了崩溃。
- 有什么办法让它在 Kotlin 中工作吗?
导致 Android Paint 崩溃的 Kotlin 代码
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
}
}
}
运行良好的原始 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
}
}
});
来自 Logcat 的堆栈跟踪
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)
Log.d(...) 的程序输出
10 是这里的 CharSequence 长度。第一个数字 - 当前索引。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,也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"/>