标签:android style blog http io color ar 使用 java
勿以恶小而为之,勿以善小而不为。惟贤惟德,能服于人。—— 刘 备
本讲内容:Animation 动画
一、Interpolator 插值器 (定义动画变化的速率) 我们也可以自定义的插值器
Interpolator对象 | 资源ID | 功能作用 |
AccelerateDecelerateInterpolator | @android:anim/accelerate_decelerate_interpolator | 先加速再减速 |
AccelerateInterpolator | @android:anim/accelerate_interpolator | 加速 |
AnticipateInterpolator | @android:anim/anticipate_interpolator | 先回退一小步然后加速前进 |
AnticipateOvershootInterpolator | @android:anim/anticipate_overshoot_interpolator | 在上一个基础上超出终点一小步再回到终点 |
BounceInterpolator | @android:anim/bounce_interpolator | 最后阶段弹球效果 |
CycleInterpolator | @android:anim/cycle_interpolator | 周期运动 |
DecelerateInterpolator | @android:anim/decelerate_interpolator | 减速 |
LinearInterpolator | @android:anim/linear_interpolator | 匀速 |
OvershootInterpolator | @android:anim/overshoot_interpolator | 速到达终点并超出一小步最后回到终点 |
二、上一讲我们用编码实现动画效果,本讲将以XML形式定义动画
我们通过一个例子感受一下,代码的讲解都写在注释里了
下面是res/layout/activity_main.xml
布局文件:
<LinearLayout 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="com.example.text.MainActivity$PlaceholderFragment" > <ImageView android:id="@+id/image" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:src="@drawable/c1" android:layout_weight="1"/> <Button android:id="@+id/translate" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="测试translate动画效果" /> <Button android:id="@+id/alpha" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="测试alpha动画效果" /> <Button android:id="@+id/rotate" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="测试rotate动画效果" /> <Button android:id="@+id/scale" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="测试scale动画效果" /> </LinearLayout>
下面是新建res/anim/alpha.xml文件:
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator"> <scale android:fromXScale="1.0" android:toXScale="0.0" android:fromYScale="1.0" android:toYScale="0.0" android:pivotX="50%" android:pivotY="50%" android:duration="2000" /> </set>
android:interpolator="@android:anim/accelerate_interpolator" <span style="font-family: Arial; font-size: 14px; line-height: 26px;">定义一个加速插值器</span>
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator"> <rotate android:fromDegrees="0" android:toDegrees="-360" android:pivotX="50%" android:pivotY="50%" android:duration="5000" /> </set>
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator"> <scale android:fromXScale="1.0" android:toXScale="0.0" android:fromYScale="1.0" android:toYScale="0.0" android:pivotX="50%" android:pivotY="50%" android:duration="2000" /> </set>
<?xml version="1.0" encoding="utf-8"?> <set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator"> <translate android:fromXDelta="50%" android:toXDelta="100%" android:fromYDelta="0%" android:toYDelta="100%" android:duration="2000" /> </set>
public class MainActivity extends Activity implements OnClickListener { private Button translate; private Button alpha; private Button rotate; private Button scale; private ImageView image; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); image = (ImageView) findViewById(R.id.image); translate = (Button) findViewById(R.id.translate); alpha = (Button) findViewById(R.id.alpha); rotate = (Button) findViewById(R.id.rotate); scale = (Button) findViewById(R.id.scale); translate.setOnClickListener(this); alpha.setOnClickListener(this); rotate.setOnClickListener(this); scale.setOnClickListener(this); } @Override public void onClick(View v) { switch (v.getId()) { case R.id.translate: // 使用AnimationUtils装载动画设置文件 Animation anim1 = (Animation) AnimationUtils.loadAnimation(MainActivity.this, R.anim.translate); image.startAnimation(anim1); break; case R.id.alpha: Animation anim2 = AnimationUtils.loadAnimation(MainActivity.this,R.anim.alpha); image.startAnimation(anim2); break; case R.id.rotate: Animation anim3 = AnimationUtils.loadAnimation(MainActivity.this,R.anim.rotate); image.startAnimation(anim3); break; case R.id.scale: Animation anim4 = AnimationUtils.loadAnimation(MainActivity.this,R.anim.scale); image.startAnimation(anim4); break; } } }
本讲到这里,谢谢大家!
标签:android style blog http io color ar 使用 java
原文地址:http://blog.csdn.net/liguojin1230/article/details/40748835