小弟想做个会动的圆,但有问题,请指教 本帖最后由 copico 于 2011-05-19 22:28:01 编辑 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 什么错,描述下,现在你的代码错误比较多,首先类名大小写注意下啊,private viewexample v1 = new viewexample(drawtest.this)这个实例化的时候最好放在onCreate里面还有你的ViewGroup写了等于没写运行出来肯定还是显示R.layout.main里面的布局 首先你的布局貌似没弄好。你可以直接把你的view设置成Activity01中的布局,如:setContentView(view);其次,你圆的x,y 坐标压根就没变化,你叫它怎么移动哦!给你个实例: Activity01: import android.app.Activity;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.KeyEvent;import android.view.MotionEvent;public class Activity01 extends Activity{ private static final int REFRESH = 0x000001; /* 声明GameView类对象 */ private GameView mGameView = null; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); /* 实例化GameView对象 */ this.mGameView = new GameView(this); // 设置显示为我们自定义的View(GameView) setContentView(mGameView); // 开启线程 new Thread(new GameThread()).start(); } Handler myHandler = new Handler() { //接收到消息后处理 public void handleMessage(Message msg) { switch (msg.what) { case Activity01.REFRESH: mGameView.invalidate(); break; } super.handleMessage(msg); } }; class GameThread implements Runnable { public void run() { while (!Thread.currentThread().isInterrupted()) { Message message = new Message(); message.what = Activity01.REFRESH; //发送消息 Activity01.this.myHandler.sendMessage(message); try { Thread.sleep(100); } catch (InterruptedException e) { Thread.currentThread().interrupt(); } } } } /** * 当然可以将GameThread类这样写 * 同样可以更新界面,并且不在需要 * Handler在接受消息 class GameThread implements Runnable { public void run() { while (!Thread.currentThread().isInterrupted()) { try { Thread.sleep(100); } catch (InterruptedException e) { Thread.currentThread().interrupt(); } //使用postInvalidate可以直接在线程中更新界面 mGameView.postInvalidate(); } } } */ //详细事件处理见第三章 //当然这些事件也可以写在GameView中 //触笔事件 public boolean onTouchEvent(MotionEvent event) { return true; } //按键按下事件 public boolean onKeyDown(int keyCode, KeyEvent event) { return true; } //按键弹起事件 public boolean onKeyUp(int keyCode, KeyEvent event) { switch (keyCode) { //上方向键 case KeyEvent.KEYCODE_DPAD_UP: mGameView.y-=3; break; //下方向键 case KeyEvent.KEYCODE_DPAD_DOWN: mGameView.y+=3; break; } return false; } public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { return true; }}GameView.java: import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.view.View;public class GameView extends View{ int miCount = 0; int y = 0; public GameView(Context context) { super(context); } // //具体绘图内容我们紧接着就会讲 public void onDraw(Canvas canvas) { if (miCount < 100) { miCount++; } else { miCount = 0; } //绘图 Paint mPaint = new Paint(); switch (miCount%4) { case 0: mPaint.setColor(Color.BLUE); break; case 1: mPaint.setColor(Color.GREEN); break; case 2: mPaint.setColor(Color.RED); break; case 3: mPaint.setColor(Color.YELLOW); break; default: mPaint.setColor(Color.WHITE); break; } //绘制矩形--后面我们将详细讲解 canvas.drawRect((320-80)/2, y, (320-80)/2+80, y+40, mPaint); }}以上参考,希望有所帮助! 不过代码放在Message message = new Message();message.what = Activity01.REFRESH;//发送消息Activity01.this.myHandler.sendMessage(message);看起来 方便 谢谢大家,问题已解决,主要问题还是mGameView.postInvalidate();mGameView.invalidate();这两个东西,二楼提供的代码很有用一楼指导的对,受教受教谢谢了,结帖 使单词变色 请教通知栏点击事件 关于android中的onTouch 和 onClick 等事件 Android SDK升级以后 Eclipse无法编译项目 如何实现一个类似ajax的登录界面。。。。 蓝牙聊天源码(改进版) android 确定 取消 对话框 android4.1里面怎么判断手机卡是否是激活的(双卡手机) 模范google io做了一个控件 服务器问题 大家好,请教一个图形坐标的问题 求解关于GLU.gluOrtho2D的问题,请大家指教啊啊啊 为什么没人回答呢,OpenGL的问题啊
还有你的ViewGroup写了等于没写
运行出来肯定还是显示R.layout.main里面的布局
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.KeyEvent;
import android.view.MotionEvent;public class Activity01 extends Activity
{
private static final int REFRESH = 0x000001;
/* 声明GameView类对象 */
private GameView mGameView = null; /** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState); /* 实例化GameView对象 */
this.mGameView = new GameView(this); // 设置显示为我们自定义的View(GameView)
setContentView(mGameView); // 开启线程
new Thread(new GameThread()).start();
} Handler myHandler = new Handler()
{
//接收到消息后处理
public void handleMessage(Message msg)
{
switch (msg.what)
{
case Activity01.REFRESH:
mGameView.invalidate();
break;
}
super.handleMessage(msg);
}
}; class GameThread implements Runnable
{
public void run()
{
while (!Thread.currentThread().isInterrupted())
{
Message message = new Message();
message.what = Activity01.REFRESH;
//发送消息
Activity01.this.myHandler.sendMessage(message);
try
{
Thread.sleep(100);
}
catch (InterruptedException e)
{
Thread.currentThread().interrupt();
}
}
}
}
/**
* 当然可以将GameThread类这样写
* 同样可以更新界面,并且不在需要
* Handler在接受消息
class GameThread implements Runnable
{
public void run()
{
while (!Thread.currentThread().isInterrupted())
{
try
{
Thread.sleep(100);
}
catch (InterruptedException e)
{
Thread.currentThread().interrupt();
}
//使用postInvalidate可以直接在线程中更新界面
mGameView.postInvalidate();
}
}
}
*/
//详细事件处理见第三章
//当然这些事件也可以写在GameView中
//触笔事件
public boolean onTouchEvent(MotionEvent event)
{
return true;
}
//按键按下事件
public boolean onKeyDown(int keyCode, KeyEvent event)
{
return true;
}
//按键弹起事件
public boolean onKeyUp(int keyCode, KeyEvent event)
{
switch (keyCode)
{
//上方向键
case KeyEvent.KEYCODE_DPAD_UP:
mGameView.y-=3;
break;
//下方向键
case KeyEvent.KEYCODE_DPAD_DOWN:
mGameView.y+=3;
break;
}
return false;
}
public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event)
{
return true;
}
}
GameView.java:
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;public class GameView extends View
{
int miCount = 0;
int y = 0;
public GameView(Context context)
{
super(context);
}
//
//具体绘图内容我们紧接着就会讲
public void onDraw(Canvas canvas)
{
if (miCount < 100)
{
miCount++;
}
else
{
miCount = 0;
}
//绘图
Paint mPaint = new Paint();
switch (miCount%4)
{
case 0:
mPaint.setColor(Color.BLUE);
break;
case 1:
mPaint.setColor(Color.GREEN);
break;
case 2:
mPaint.setColor(Color.RED);
break;
case 3:
mPaint.setColor(Color.YELLOW);
break;
default:
mPaint.setColor(Color.WHITE);
break;
}
//绘制矩形--后面我们将详细讲解
canvas.drawRect((320-80)/2, y, (320-80)/2+80, y+40, mPaint);
}
}以上参考,希望有所帮助!
message.what = Activity01.REFRESH;
//发送消息
Activity01.this.myHandler.sendMessage(message);看起来 方便
mGameView.postInvalidate();
mGameView.invalidate();
这两个东西,二楼提供的代码很有用
一楼指导的对,受教受教
谢谢了,结帖