1 public class Main4Activity extends Activity {
2
3 private TextView tv1;
4 private Button button1;
5 private RelativeLayout rlMain;
6 private int mHeight = 0;
7 int topHide;
8 int topShow;
9
10 @Override
11 protected void onCreate(Bundle savedInstanceState) {
12 super.onCreate(savedInstanceState);
13 setContentView(R.layout.activity_main4);
14
15 rlMain = (RelativeLayout) findViewById(R.id.rlMain);
16 tv1 = (TextView) findViewById(R.id.tv1);
17 tv1.setVisibility(View.GONE);
18 button1 = (Button) findViewById(R.id.button1);
19
20 final LayoutTransition transitioner = new LayoutTransition();
21 transitioner.setDuration(150);
22 rlMain.setLayoutTransition(transitioner);
23
24 mHeight = getResources().getDisplayMetrics().heightPixels
25 - getStatusBarHeight(this);
26
27 getWindow().getDecorView().addOnLayoutChangeListener(
28 new View.OnLayoutChangeListener() {
29
30 @Override
31 public void onLayoutChange(View arg0, int arg1, int arg2,
32 int arg3, int arg4, int arg5, int arg6, int arg7,
33 int arg8) {
34
35 //计算显示时y坐标
36 topShow = mHeight - dip2px(Main4Activity.this, 70)
37 - getActionBar().getHeight();
38 //计算隐藏时y坐标
39 topHide = mHeight - getActionBar().getHeight();
40
41 // VISIBLE
42 ObjectAnimator customAppearingAnim = ObjectAnimator
43 .ofFloat(null, "y", topHide, topShow);
44 customAppearingAnim
45 .addListener(new AnimatorListenerAdapter() {
46 public void onAnimationEnd(Animator anim) {
47 View view = (View) ((ObjectAnimator) anim)
48 .getTarget();
49 view.setY(topShow);
50 }
51 });
52
53 // GONE
54 ObjectAnimator customDisappearingAnim = ObjectAnimator
55 .ofFloat(null, "y", topShow, topHide);
56 customDisappearingAnim
57 .addListener(new AnimatorListenerAdapter() {
58 public void onAnimationEnd(Animator anim) {
59 View view = (View) ((ObjectAnimator) anim)
60 .getTarget();
61 view.setY(topHide);
62 }
63 });
64
65 transitioner.setAnimator(LayoutTransition.APPEARING,
66 customAppearingAnim);
67
68 transitioner.setAnimator(LayoutTransition.DISAPPEARING,
69 customDisappearingAnim);
70
71 }
72 });
73
74 button1.setOnClickListener(new OnClickListener() {
75
76 @Override
77 public void onClick(View arg0) {
78
79 if (tv1.getVisibility() == View.GONE) {
80
81 tv1.setVisibility(View.VISIBLE);
82
83 } else {
84 tv1.setVisibility(View.GONE);
85 }
86
87 }
88 });
89
90 }
91
92 /**
93 * dip转px
94 * @param context
95 * @param dipValue
96 * @return
97 */
98 public static int dip2px(Context context, float dipValue) {
99 final float scale = context.getResources().getDisplayMetrics().density;
100 return (int) (dipValue * scale + 0.5f);
101 }
102
103 /**
104 * 获取系统状态栏高度
105 * @param context
106 * @return
107 */
108 public int getStatusBarHeight(Context context) {
109 Class<?> c = null;
110 Object obj = null;
111 Field field = null;
112 int x = 0, statusBarHeight = 0;
113 try {
114 c = Class.forName("com.android.internal.R$dimen");
115 obj = c.newInstance();
116 field = c.getField("status_bar_height");
117 x = Integer.parseInt(field.get(obj).toString());
118 statusBarHeight = context.getResources().getDimensionPixelSize(x);
119 Log.v("@@@@@@", "the status bar height is : " + statusBarHeight);
120 } catch (Exception e1) {
121 e1.printStackTrace();
122 }
123 return statusBarHeight;
124 }
125
126 }
1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
2 xmlns:tools="http://schemas.android.com/tools"
3 android:id="@+id/rlMain"
4 android:layout_width="match_parent"
5 android:layout_height="match_parent" >
6
7 <TextView
8 android:id="@+id/tv1"
9 android:layout_width="match_parent"
10 android:layout_height="70dp"
11 android:layout_alignParentBottom="true"
12 android:background="@android:color/holo_red_dark"
13 android:gravity="center"
14 android:text="@string/hello_world"
15 android:textColor="@android:color/white" />
16
17 <Button
18 android:id="@+id/button1"
19 android:layout_width="wrap_content"
20 android:layout_height="wrap_content"
21 android:layout_alignParentLeft="true"
22 android:layout_alignParentTop="true"
23 android:layout_marginLeft="44dp"
24 android:text="Button" />
25
26 <TextView
27 android:id="@+id/textView1"
28 android:layout_width="match_parent"
29 android:layout_height="wrap_content"
30 android:layout_alignLeft="@+id/button1"
31 android:layout_below="@+id/button1"
32 android:maxLines="10"
33 android:scrollbars="vertical"
34 android:text="TextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextViewTextView" />
35
36 </RelativeLayout>
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