Android 动画

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android设置动画效果可以通过xml和java代码两种方式

1.通过xml设置动画

在文件夹中添加xml文件: 

view_anim_alpha

                    public boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();Animation animation=null;Animation animation2=null;if (id == R.id.action_alpha) {animation=AnimationUtils.loadAnimation(MainActivity.this, R.anim.view_anim_alpha);animation2=new  AlphaAnimation(1, 0); animation2.setRepeatCount(5);animation2.setDuration(2500);animation2.setRepeatMode(AlphaAnimation.REVERSE);img_1.startAnimation(animation2); }else if(id==R.id.action_rotate){animation=AnimationUtils.loadAnimation(MainActivity.this, R.anim.view_anim_rotate);img_1.startAnimation(animation);}else if(id==R.id.action_scale){ animation=AnimationUtils.loadAnimation(MainActivity.this, R.anim.view_anim_scale);img_1.startAnimation(animation);}else if(id==R.id.action_set){ animation=AnimationUtils.loadAnimation(MainActivity.this, R.anim.view_anim_set);img_1.startAnimation(animation);}else if(id==R.id.action_translate){animation=AnimationUtils.loadAnimation(MainActivity.this, R.anim.view_anim_translate);img_1.startAnimation(animation);  }return super.onOptionsItemSelected(item);}

2.通过代码设置动画

private void setAnimation(){Animation animation1=null;Animation animation2=null;Animation animation3=null;Animation animation4=null;animation1=new AlphaAnimation(1,0);animation1.setRepeatCount(2);animation1.setDuration(2500);animation1.setRepeatMode(Animation.REVERSE);animation2=new TranslateAnimation(1, 0, 1, 0, 1, 0, 1, 1);animation2.setRepeatCount(2);animation2.setDuration(2500);animation2.setRepeatMode(Animation.REVERSE);animation3=new RotateAnimation(0, 720, 1,(float)0.5, 1, (float)0.5);animation3.setRepeatCount(2);animation3.setDuration(2500);animation3.setRepeatMode(Animation.REVERSE);animation4=new ScaleAnimation((float)1.0, (float)-1.0, (float)-1.0, (float)1.0,1, (float)0.5, 1, (float)0.5);animation4.setRepeatCount(2);animation4.setDuration(2500);animation4.setRepeatMode(Animation.REVERSE);}