Android获取TextView显示的字符串宽度

public float getTextWidth(Context Context,String text,int textSize){
		TextPaint paint = new TextPaint();
		float scaledDensity = Context.getResource().getDisplayMetrics().scaledDensity;
		paint.setTextSize(scaledDensity * textSize);
		return paint.measureText(text);
	}

public class MainActivity extends Activity {
	
	private final static String TAG = "MainActivity";

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		
		// 测试字符串
		// 测试例子均用15sp的字体大小
		String text = "测试中文";
		
		TextView textView = (TextView) findViewById(R.id.test);
		textView.setText(text);
		
		int spec = MeasureSpec.makeMeasureSpec(0,MeasureSpec.UNSPECIFIED);
		textView.measure(spec,spec);
		
		// getMeasuredWidth
		int measuredWidth = textView.getMeasuredWidth();
		
		// new textpaint measureText
		TextPaint newPaint = new TextPaint();
		float textSize = getResources().getDisplayMetrics().scaledDensity * 15;
		newPaint.setTextSize(textSize);
		float newPaintWidth = newPaint.measureText(text);
		
		// textView getPaint measureText
		TextPaint textPaint = textView.getPaint();
		float textPaintWidth = textPaint.measureText(text);
		
		Log.i(TAG,"测试字符串:" + text);
		Log.i(TAG,"getMeasuredWidth:" + measuredWidth);
		Log.i(TAG,"newPaint measureText:" + newPaintWidth);
		Log.i(TAG,"textView getPaint measureText:" + textPaintWidth);
		
	}
}

测试字符串:测试中文
getMeasuredWidth:180
measureText:180.0
getPaint measureText:180.0 

测试字符串:测试英文abcd
getMeasuredWidth:279
newPaint measureText:278.0
textView getPaint measureText:279.0