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[英]Why I can't take a screenshot using selenium webdriver in java?
[英]can't take screenshot of a layout
我正在嘗試對我的應用程序中的一種布局進行截圖。 但是當我按屏幕截圖按鈕時,App崩潰了。
日志:
05-05 23:17:29.000: E/AndroidRuntime(21992): FATAL EXCEPTION: main
05-05 23:17:29.000: E/AndroidRuntime(21992): java.lang.NullPointerException
05-05 23:17:29.000: E/AndroidRuntime(21992): at android.graphics.Bitmap.createBitmap(Bitmap.java:526)
05-05 23:17:29.000: E/AndroidRuntime(21992): at com.tiktak.babyalbum.Helper$8.onClick(Helper.java:298)
05-05 23:17:29.000: E/AndroidRuntime(21992): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:185)
05-05 23:17:29.000: E/AndroidRuntime(21992): at android.os.Handler.dispatchMessage(Handler.java:99)
05-05 23:17:29.000: E/AndroidRuntime(21992): at android.os.Looper.loop(Looper.java:137)
05-05 23:17:29.000: E/AndroidRuntime(21992): at android.app.ActivityThread.main(ActivityThread.java:5306)
05-05 23:17:29.000: E/AndroidRuntime(21992): at java.lang.reflect.Method.invokeNative(Native Method)
05-05 23:17:29.000: E/AndroidRuntime(21992): at java.lang.reflect.Method.invoke(Method.java:511)
05-05 23:17:29.000: E/AndroidRuntime(21992): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
05-05 23:17:29.000: E/AndroidRuntime(21992): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
05-05 23:17:29.000: E/AndroidRuntime(21992): at dalvik.system.NativeStart.main(Native Method)
我正在使用一個Helper類來獲得更簡潔的代碼,這是Helper Code Arround Line 298:
View u = act.findViewById(id);
u.setDrawingCacheEnabled(true);
LinearLayout z = (LinearLayout) act.findViewById(id);
int totalHeight = z.getHeight();
int totalWidth = z.getWidth();
u.layout(0, 0, totalWidth, totalHeight);
u.buildDrawingCache(true);
298--> Bitmap b = Bitmap.createBitmap(u.getDrawingCache());
u.setDrawingCacheEnabled(false);
String filePath = Environment.getExternalStorageDirectory()
+ File.separator + st1;
File myPath = new File(filePath);
FileOutputStream fos = null;
這是一個奇怪的情況,因為如果我在高水平的手機(如Samsung s4)上測試它會崩潰,但是如果我在低水平的手機(如HTC wildfire s)上測試它就可以了。
任何想法?
編輯:基於Goran注釋,我檢查了一下以這種方式返回null:
View u = act.findViewById(id);
LinearLayout z = (LinearLayout) act.findViewById(id);
u.setDrawingCacheEnabled(true);
int totalHeight = z.getHeight();
int totalWidth = z.getWidth();
u.layout(0, 0, totalWidth, totalHeight);
u.buildDrawingCache(true);
if (u.getDrawingCache() == null) {
Toast.makeText(act.getApplicationContext(), "DrawingCache is Null",
Toast.LENGTH_LONG).show();
} else {
Bitmap b = Bitmap.createBitmap(u.getDrawingCache());
u.setDrawingCacheEnabled(false);
String filePath = Environment.getExternalStorageDirectory()
+ File.separator + st1;
File myPath = new File(filePath);
在Wildfire S中,它起作用了,但是在s4中,我得到了“ DrawingCatch為null” Toast。
那么如何防止空值呢?
多虧了這個答案,我通過使用以下代碼解決了我的問題:
CustomView view = (CustomView) findViewById(R.id.customViewId);
Bitmap bitmap = Bitmap.createBitmap(view.getMeasuredWidth(),
view.getMeasuredHeight(), Bitmap.Config.ARGB_8888);
Canvas bitmapHolder = new Canvas(bitmap);
view.draw(bitmapHolder);
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