4.5 腾讯手机卫士小火箭发射效果-优快云博客

本文链接：https://blog.youkuaiyun.com/yangxingting/article/details/13162391

//设置动画效果:

<? xml version = "1.0" encoding = "utf-8" ?>

< animation-list xmlns:android = "http://schemas.android.com/apk/res/android"

android:oneshot = "false" >

< item android:drawable = "@drawable/desktop_rocket_launch_1" android:duration = "200" />

< item android:drawable = "@drawable/desktop_rocket_launch_2" android:duration = "200" />

</ animation-list >

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public class MainActivity extends Activity {

AnimationDrawable rocketAnimation ;

ImageView rocketImage ;

ImageView iv_bottom ;

ImageView iv_somke_top ;

//跟新ui

Handler handler = new Handler(){

public void handleMessage(android.os.Message msg) {

int height = msg. what ;

int iv_height = rocketImage .getBottom() - rocketImage .getTop(); //得到imageview 的高度

rocketImage .layout( rocketImage .getLeft(), height, rocketImage .getRight(), height+iv_height );

if (msg. what ==0){

AlphaAnimation aa = new AlphaAnimation(1.0f, 0.0f);

aa.setFillAfter( true );

aa.setDuration(1000);

iv_somke_top .startAnimation(aa);

iv_bottom .setVisibility(View. INVISIBLE );

}

if (msg. what ==200){

iv_somke_top .setVisibility(View. VISIBLE );

}

};

@Override

protected void onCreate(Bundle savedInstanceState) {

super .onCreate(savedInstanceState);

setContentView(R.layout. activity_main );

//找到关心的控件

rocketImage = (ImageView) findViewById(R.id. iv_rocket );

rocketImage .setBackgroundResource(R.drawable. rocket );

rocketAnimation = (AnimationDrawable) rocketImage .getBackground();

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

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

//给imageView设置触摸事件

rocketImage .setOnTouchListener( new OnTouchListener() {

int startX =0;

int startY = 0;

@Override

public boolean onTouch(View v, MotionEvent event) {

if (! rocketAnimation .isRunning()) {

rocketAnimation .start();

}

switch (event.getAction()) {

case MotionEvent. ACTION_DOWN : //摸到时

startX = ( int ) event.getRawX();

startY = ( int ) event.getRawY();

break ;

case MotionEvent. ACTION_MOVE : //移动时

int newX = ( int ) event.getRawX();

int newY = ( int ) event.getRawY();

int dx = newX - startX ;

int dy = newY - startY ;

int l = rocketImage .getLeft();

int r = rocketImage .getRight();

int t = rocketImage .getTop();

int b = rocketImage .getBottom();

int newl = l+ dx;

int newr = r+ dx;

int newt = t + dy;

int newb = b + dy;

rocketImage .layout(newl, newt, newr, newb); //确定 imageview的位置

startX = ( int ) event.getRawX();

startY = ( int ) event.getRawY();

break ;

case MotionEvent. ACTION_UP : //离开时

int bottom = rocketImage .getBottom();

int left = rocketImage .getLeft();

if ( bottom > 400 && left>100){

Toast. makeText(getApplicationContext(), "发射火箭" , 0).show();

iv_bottom .setVisibility(View. VISIBLE );

AlphaAnimation aa = new AlphaAnimation(0.0f, 1.0f);

aa.setDuration(1000);

iv_bottom .startAnimation(aa);

//动态定时更新 view对象的位置.

new Thread(){

public void run() {

for ( int i =1 ;i<=8;i++){

try {

Thread. sleep(10);

} catch (InterruptedException e) {

e.printStackTrace();

}

int height = 50*i;

handler .sendEmptyMessage(400-height);

}

};

}.start();

}

break ;

}

return true ;

}

});

}