經(jīng)過(guò)測(cè)試發(fā)現(xiàn)屏幕的像素點(diǎn) 如果

density =1 那么 1dp = 1px

density =2 那么 1dp = 2px

density =3 那么 1dp = 3px

在字體設(shè)置的時(shí)候用dp比用px好，因?yàn)檫@樣可以防止在不同的分辨率上顯示的字體大小不同

textView_bacMsg = (TextView) findViewById(R.id.textView_bacMsg);

bacImg = (ImageView) findViewById(R.id.bacImg);

drawable = new MyProgressDrawable(this);

// 獲取屏幕密度(方法2)

DisplayMetrics dm = new DisplayMetrics();

dm = getResources().getDisplayMetrics();

float density? = dm.density;??????? // 屏幕密度(像素比例：0.75/1.0/1.5/2.0)

int densityDPI = dm.densityDpi;???? // 屏幕密度(每寸像素：120/160/240/320)

float xdpi = dm.xdpi;

float ydpi = dm.ydpi;

int screenWidth? = dm.widthPixels;????? // 屏幕寬(像素，如：480px)

int? screenHeight = dm.heightPixels;???? // 屏幕高(像素，如：800px)

RelativeLayout.LayoutParams? layoutParams =new? RelativeLayout.LayoutParams(-2, -2);

layoutParams.width = screenWidth-200;

layoutParams.height = screenWidth-200;

layoutParams.topMargin = (int) ((screenHeight - 240*density - ( screenWidth-200))/2);

layoutParams.leftMargin = (int) ((screenWidth- ( screenWidth-200))/2);

bacImg.setLayoutParams(layoutParams);

bacImg.setBackgroundDrawable(drawable);

drawable.start();

RelativeLayout.LayoutParams? layoutParams_text =(LayoutParams) textView_bacMsg.getLayoutParams();

layoutParams_text.topMargin =(int) ((screenHeight - 240*density - (layoutParams_text.height))/2);

Log.e("中間的字體寬度", layoutParams_text.width+"");

layoutParams_text.leftMargin = (int) ((screenWidth - (20*4*density))/2);

textView_bacMsg.setLayoutParams(layoutParams_text);

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