关于Android基本动画的应用

public class MainActivity extends Activity {

private TextView textView;
private EditText editText1;
private EditText editText2;
private LinearLayout layout;
private int height;

private boolean hasUp = false;
private boolean hasShow = false;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

layout = (LinearLayout) findViewById(R.id.layout);
textView = (TextView) findViewById(R.id.textView);
editText1 = (EditText) findViewById(R.id.editText1);
editText2 = (EditText) findViewById(R.id.editText2);

editText1.setOnFocusChangeListener(mFocusChangeListener);
editText1.addTextChangedListener(mTextWatcher);

int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
editText2.measure(w, h);
height = editText2.getMeasuredHeight() / 2;
}

/**
* 焦点监听
*/
private OnFocusChangeListener mFocusChangeListener = new OnFocusChangeListener() {

@Override
public void onFocusChange(View v, boolean hasFocus) {
if (hasFocus && !hasUp) {
slideview(textView.getTop(), -48);
}
}
};

/**
* 内容监听
*/
private TextWatcher mTextWatcher = new TextWatcher() {

@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
if (s.length() > 0 && !hasShow) {
showView(layout.getTop() + height, 150);
}
}

@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {

}

@Override
public void afterTextChanged(Editable s) {

}
};

/**
* 上移动画
*
* @param p1
* @param p2
*/
public void slideview(final float p1, final float p2) {
/* 位置移动渐变效果 */
TranslateAnimation animation = new TranslateAnimation(0, 0, p1, p2);
animation.setInterpolator(new OvershootInterpolator());
animation.setDuration(400);
animation.setStartOffset(100);
animation.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
}

@Override
public void onAnimationRepeat(Animation animation) {
}

@Override
public void onAnimationEnd(Animation animation) {
hasUp = true;
int left = textView.getLeft();
int top = textView.getTop();
int right = textView.getRight();
int bottom = textView.getBottom();
textView.clearAnimation();
textView.layout(left, top + (int) p2, right, bottom);

LayoutParams params = (LayoutParams) textView.getLayoutParams();
params.topMargin += p2;
textView.setLayoutParams(params);
}
});
textView.startAnimation(animation);
}

/**
* 显示动画
*
* @param p1
* @param p2
*/
private void showView(final float p1, final float p2) {
/* 渐变透明度渐变效果 */
AnimationSet animationSet = new AnimationSet(true);
AlphaAnimation alphaAnimation = new AlphaAnimation(0, 1);
alphaAnimation.setInterpolator(new LinearInterpolator());
alphaAnimation.setDuration(1200);
animationSet.addAnimation(alphaAnimation);

/* 位置移动渐变效果 */
TranslateAnimation animation = new TranslateAnimation(0, 0, p1, p2);
animation.setInterpolator(new LinearInterpolator());
animation.setDuration(400);
animation.setStartOffset(100);
animation.setAnimationListener(new Animation.AnimationListener() {
@Override
public void onAnimationStart(Animation animation) {
layout.setVisibility(View.VISIBLE);
}

@Override
public void onAnimationRepeat(Animation animation) {
}

@Override
public void onAnimationEnd(Animation animation) {
hasShow = true;
int left = layout.getLeft();
int top = layout.getTop();
int right = layout.getRight();
int bottom = layout.getBottom();
layout.clearAnimation();
layout.layout(left, top + (int) p2, right, bottom);

LayoutParams params = (LayoutParams) layout.getLayoutParams();
params.topMargin += p2;
layout.setLayoutParams(params);
}
});
layout.startAnimation(animation);
// animationSet.addAnimation(animation);
// animationSet.setFillBefore(false);
// animationSet.setFillAfter(true);
// layout.startAnimation(animationSet);
}

}

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity" >

<LinearLayout
android:id="@+id/layout"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="24dp"
android:layout_marginLeft="24dp"
android:layout_marginRight="24dp"
android:layout_marginTop="60dp"
android:orientation="vertical"
android:visibility="gone" >

<EditText
android:id="@+id/editText2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:hint="请再次输入账号"
android:paddingTop="24dp"
android:textColor="#333333"
android:textColorHint="#999999"
android:textSize="15sp" />
</LinearLayout>

<RelativeLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="24dp"
android:layout_marginLeft="24dp"
android:layout_marginRight="24dp"
android:layout_marginTop="60dp"
android:focusableInTouchMode="true" >

<EditText
android:id="@+id/editText1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingTop="24dp"
android:textColor="#333333"
android:textSize="15sp" />

<TextView
android:id="@+id/textView"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="bottom"
android:paddingBottom="12dp"
android:paddingLeft="12dp"
android:paddingTop="24dp"
android:text="请输入账号"
android:textColor="#999999"
android:textSize="15sp" />
</RelativeLayout>

</RelativeLayout>