小火箭案例

我会带着你远行 2022-08-05 02:17 171阅读 0赞

package com.itheima.rocket;
    
    import java.nio.channels.AlreadyConnectedException;
    
    import android.os.Bundle;
    import android.os.Handler;
    import android.os.Message;
    import android.app.Activity;
    import android.graphics.drawable.AnimationDrawable;
    import android.view.Menu;
    import android.view.MotionEvent;
    import android.view.View;
    import android.view.View.OnTouchListener;
    import android.view.animation.AlphaAnimation;
    import android.view.animation.Animation;
    import android.widget.ImageView;
    import android.widget.Toast;
    
    public class MainActivity extends Activity {
    	private ImageView iv;
    	private ImageView iv_bottom; 
    	private ImageView iv_top;
    	private AnimationDrawable rocketAnimation;
    	private Handler handler = new Handler(){
    		public void handleMessage(android.os.Message msg) {
    			int position = (Integer) msg.obj ;
    			iv.layout(iv.getLeft(), position, iv.getRight(), position+iv.getHeight());
    			if(position<320){
    				iv_top.setVisibility(View.VISIBLE);
    				AlphaAnimation aa = new AlphaAnimation(0.6f, 1.0f);
    				aa.setDuration(300);
    				iv_top.startAnimation(aa);
    			}
    			if(position<20){
    				AlphaAnimation aa = new AlphaAnimation(1.0f, 0.0f);
    				aa.setDuration(300);
    				aa.setFillAfter(true);
    				iv_top.startAnimation(aa);
    			}
    			
    		};
    	};
    
    	@Override
    	protected void onCreate(Bundle savedInstanceState) {
    		super.onCreate(savedInstanceState);
    		setContentView(R.layout.activity_main);
    		iv = (ImageView) findViewById(R.id.iv);
    		iv.setBackgroundResource(R.drawable.rocket);
    		iv_top = (ImageView) findViewById(R.id.iv_top);
    		iv_bottom = (ImageView) findViewById(R.id.iv_bottom);
    		rocketAnimation = (AnimationDrawable) iv.getBackground();
    		rocketAnimation.start();
    
    		iv.setOnTouchListener(new OnTouchListener() {
    			int startX;
    			int startY;
    
    			@Override
    			public boolean onTouch(View v, MotionEvent event) {
    				switch (event.getAction()) {
    				case MotionEvent.ACTION_DOWN:
    					startX =(int) event.getRawX();
    					startY =(int) event.getRawY();
    					break;
    
    				case MotionEvent.ACTION_MOVE:
    					int newX =(int) event.getRawX();
    					int newY =(int) event.getRawY();
    					int dx = newX - startX;
    					int dy = newY - startY;
    					//wm.updateViewLayout();
    					iv.layout(iv.getLeft()+dx, iv.getTop()+dy, iv.getRight()+dx, iv.getBottom()+dy);
    					startX =(int) event.getRawX();
    					startY =(int) event.getRawY();
    					break;
    				case MotionEvent.ACTION_UP:
    					int top = iv.getTop();
    					int left = iv.getLeft();
    					int right = iv.getRight();
    					if(top>300&&left>100&&right<220){
    						Toast.makeText(getApplicationContext(), "发射火箭", 0).show();
    						iv_bottom.setVisibility(View.VISIBLE);
    						AlphaAnimation aa = new AlphaAnimation(0.0f, 1.0f);
    						aa.setDuration(500);
    						aa.setRepeatCount(1);
    						aa.setRepeatMode(Animation.REVERSE);
    						aa.setFillAfter(true);
    						iv_bottom.startAnimation(aa);
    						sendRocket();
    					}
    					break;
    				}
    				return true;
    			}
    		});
    	}
    
    	protected void sendRocket() {
    		new Thread(){
    			public void run() {
    				int start = 380;
    				for(int i = 0 ;i<=11;i++){
    					try {
    						Thread.sleep(50);
    					} catch (InterruptedException e) {
    						e.printStackTrace();
    					}
    					//更新一下ui
    					Message msg = Message.obtain();
    					msg.obj = 380 - i*38;//计算出火箭的高度
    					handler.sendMessage(msg);
    				}
    			};
    		}.start();
    		
    	}
    }