java.lang.IllegalArgumentException：寬度和高度必須> 0在android

Question

我試圖從MultiAutoCompleteTextView從用戶的文本，並顯示他們在像泡沫格式，但我得到 ：寬度和高度必須是在Android的

final MultiAutoCompleteTextView tags = (MultiAutoCompleteTextView) findViewById(R.id.multiAutoCompleteTextView1); 
    String[] TAGS = getResources().getStringArray(R.array.countries); 
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, TAGS); 
    tags.setAdapter(adapter); 
    tags.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer()); 
    tags.setThreshold(1); 
    String contactName = tags.getText().toString(); 
    final SpannableStringBuilder sb = new SpannableStringBuilder(); 
    TextView tv = createContactTextView(contactName); 
    BitmapDrawable bd = (BitmapDrawable) convertViewToDrawable(tv); 
    bd.setBounds(0, 0, bd.getIntrinsicWidth(), bd.getIntrinsicHeight()); 

    sb.append(contactName + ","); 
    sb.setSpan(new ImageSpan(bd), sb.length() - (contactName.length() + 1), sb.length() - 1, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 
    Toast.makeText(getApplicationContext(),sb,Toast.LENGTH_SHORT).show(); 

} 

    public TextView createContactTextView(String text){ 
     //creating textview dynamically 
     TextView tv = new TextView(this); 
     tv.setText(text); 
     tv.setTextSize(20); 
     tv.setBackgroundResource(R.drawable.oval); 
     tv.setCompoundDrawablesWithIntrinsicBounds(0, 0, R.drawable.ic_clear_search_api_holo_light, 0); 
     return tv; 
    } 

    public static Object convertViewToDrawable(View view) { 
     int spec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED); 
     view.measure(spec, spec); 
     view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight()); 
     Bitmap b = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888); 
     Canvas c = new Canvas(b); 
     c.translate(-view.getScrollX(), -view.getScrollY()); 
     view.draw(c); 
     view.setDrawingCacheEnabled(true); 
     Bitmap cacheBmp = view.getDrawingCache(); 
     Bitmap viewBmp = cacheBmp.copy(Bitmap.Config.ARGB_8888, true); 
     view.destroyDrawingCache(); 
     return new BitmapDrawable(viewBmp); 

    } 

> 0時，我嘗試牛逼運行此我得到這個錯誤 寬度和高度必須大於0

E/AndroidRuntime: FATAL EXCEPTION: main 
               Process: com.androidbegin.train, PID: 11263 
               java.lang.RuntimeException: Unable to start activity ComponentInfo{com.androidbegin.train/com.androidbegin.loginregister.WorkNow}: java.lang.IllegalArgumentException: width and height must be > 0 
                at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2339) 
                at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413) 
                at android.app.ActivityThread.access$800(ActivityThread.java:155) 
                at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317) 
                at android.os.Handler.dispatchMessage(Handler.java:102) 
                at android.os.Looper.loop(Looper.java:135) 
                at android.app.ActivityThread.main(ActivityThread.java:5343) 
                at java.lang.reflect.Method.invoke(Native Method) 
                at java.lang.reflect.Method.invoke(Method.java:372) 
                at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905) 
                at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700) 
               Caused by: java.lang.IllegalArgumentException: width and height must be > 0 
                at android.graphics.Bitmap.createBitmap(Bitmap.java:836) 
                at android.graphics.Bitmap.createBitmap(Bitmap.java:815) 
                at android.graphics.Bitmap.createBitmap(Bitmap.java:782) 
                at com.androidbegin.loginregister.WorkNow.convertViewToDrawable(WorkNow.java:57) 
                at com.androidbegin.loginregister.WorkNow.onCreate(WorkNow.java:34) 
                at android.app.Activity.performCreate(Activity.java:6010) 
                at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129) 
                at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2292) 
                at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2413)  
                at android.app.ActivityThread.access$800(ActivityThread.java:155)  
                at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1317)  
                at android.os.Handler.dispatchMessage(Handler.java:102)  

Answer 1

我認爲主要的問題是，spec被設置爲0

int spec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED); 

然後，在這裏，鑑於將有0寬度和高度...

view.measure(spec, spec); 
view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight()); 

因此，在創建位圖時，一個Exception不會發生，因爲view.getMeasuredWidth()和view.getMeasuredHeight()都是0，他們不可能是

Bitmap b = Bitmap.createBitmap(view.getMeasuredWidth(), view.getMeasuredHeight(), Bitmap.Config.ARGB_8888); 

如果可能，請嘗試更改類似於：

int spec = View.MeasureSpec.makeMeasureSpec(ViewGroup.LayoutParams.WRAP_CONTENT, View.MeasureSpec.UNSPECIFIED);