After setting the text size View TextView height change

Encounter a problem is this: When the character TextView displays only one line, narrow height unchanged text size, View of. Why is this so? TextView set for my height wrap_content, why not have the same high degree View of narrow? If I want to shrink it, how to do it?
When TextView is displayed as two lines of text when the problem does not exist. This time the height decrease the text size, View is also reduced.

To confirm this, I deliberately write a Demo in the following:

A string resource:.

  AB  
 AB \ nCD  

2.main.xml

  
android: layout_width = "fill_parent" 
android: layout_height = "fill_parent" 
android: orientation = "vertical"> 

android: id = "@ + id / test" 
android: layout_width = "fill_parent" 
android: layout_height = "wrap_content" 
android: background = "# FFFFFF00" /> 

 

 

 

3.TestActivity.java

 public class TestActivity extends Activity {

TextView tvTest; 
Button btnChangeSize; 
Button btnChangeText; 
boolean sizeChanged; 
boolean textChanged; 

/ ** Called when the activity is first created. * / 
@ Override 
public void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState); 
setContentView (R.layout.main); 

tvTest = (TextView) findViewById (R.id.test); 
tvTest.setTextSize (30f); 
tvTest.setText (R.string.one_line); 
btnChangeSize = (Button) findViewById (R.id.btn_changeSize); 
btnChangeSize.setOnClickListener (new OnClickListener () {

@ Override 
public void onClick (View v) {
/ / TODO Auto-generated method stub 
if (sizeChanged) {
sizeChanged = false; 
tvTest.setTextSize (30f); 
} Else {
sizeChanged = true; 
tvTest.setTextSize (18f); 
} 

} 
}); 

btnChangeText = (Button) findViewById (R.id.btn_changeTest); 
btnChangeText.setOnClickListener (new OnClickListener () {

@ Override 
public void onClick (View v) {
/ / TODO Auto-generated method stub 
if (textChanged) {
textChanged = false; 
tvTest.setText (R.string.one_line); 
} Else {
textChanged = true; 
tvTest.setText (R.string.two_line); 
} 
} 
}); 
} 
} 

Seeking advice! !
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Reply:
Not ah, only one line you can also change the Text size Text reduce the height of the outside, fitness has always been a high
Reply:
Under clean look
Reply:
clean under it
Reply:

landlord references replies:

encountered a problem is this: When the character TextView displays only one line, reduce the size of the text, the height unchanged View . Why is this so? TextView set for my height wrap_content, why not have the same high degree View of narrow? If I want to shrink it, how to do it?
When TextView is displayed as two lines of text when the problem does not exist. This time the height decrease the text size, View is also reduced.

To confirm this, I deliberately write a Demo in the following:

......

My version 4.0.3, I heard that this version has this bug. postInvalidate () are not refreshed.
Reply:
I also have the same problem, how to allow view of the highly adaptable height variation the textview? ?
Reply:
Find related topics:
http://stackoverflow.com/questions/9541196/androidtextview-height-doesnt-change-after-shrinking-the-font-size