![](/img/trans.png)
[英]java.lang.NullPointerException : on android.widget.EditText.addTextchangedlistener
[英]EditText TextWatcher java.lang.NullPointerException for android 2.3 devices
我使用edittext和textwatcher。 我的應用程序在android 2.3上運行時崩潰
我使用以下代碼:
MyEditText.addTextChangedListener(new TextWatcher() {
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count,
int after) {
}
@Override
public void afterTextChanged(Editable s) {
if(salam!=null){
Mybit = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(),Config.ARGB_8888);
Canvas canvas = new Canvas(Mybit);
canvas.drawBitmap(bitmap, 0, 0, null);
Drawtext = s.toString();
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(Color.BLACK);
paint.setTextSize(320);
paint.setStyle(Style.FILL);
paint.setShadowLayer(10f, 10f, 10f, Color.BLACK);
paint.setTextAlign(Align.CENTER);
Rect rectText = new Rect();
paint.getTextBounds(Drawtext, 0, Drawtext.length(), rectText);
int x = (canvas.getWidth() / 2);
int y = (int) ((canvas.getHeight() / 2) - ((paint.descent() + paint.ascent()) / 2)) ;
canvas.drawText(Drawtext, x, y, paint);
}
}
});
一位用戶向我發送了以下日志:
java.lang.RuntimeException: Unable to start activity ComponentInfo{**************************************.MainActivity}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1816)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1837)
at android.app.ActivityThread.access$1500(ActivityThread.java:132)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1033)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:143)
at android.app.ActivityThread.main(ActivityThread.java:4196)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at ********************************.afterTextChanged(MainActivity.java:195)
at android.widget.TextView.sendAfterTextChanged(TextView.java:6561)
at android.widget.TextView.setText(TextView.java:2821)
at android.widget.TextView.setText(TextView.java:2682)
at android.widget.EditText.setText(EditText.java:84)
at android.widget.TextView.setText(TextView.java:2657)
at android.widget.TextView.onRestoreInstanceState(TextView.java:2557)
at android.view.View.dispatchRestoreInstanceState(View.java:6325)
at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:1279)
at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:1279)
at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:1279)
at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:1279)
at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:1279)
at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:1279)
at android.view.View.restoreHierarchyState(View.java:6304)
at com.android.internal.policy.impl.PhoneWindow.restoreHierarchyState(PhoneWindow.java:1538)
at android.app.Activity.onRestoreInstanceState(Activity.java:882)
at android.app.Activity.performRestoreInstanceState(Activity.java:854)
at android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1162)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1794)
... 11 more
我還沒有找到任何解決方案。 我希望我可以做一些事情而不會改變結果。 提前致謝!
嘗試改變
if(photoPath!=null){ ... code}
to
if(null != photoPath && null != s){ ..... code}
我認為Editable可能為null
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