android划线,安卓手机上划线怎样设置

android 中如何画一条动态的画一条直线.(即从A到慢慢运动到B点的轨迹，走过后轨迹是一条线)

首先找到这条直线的所有点，然后开启一个线程循环获取点，用Handle发送消息去画线

@Override

public void run() {

try {

for(int i = 0 ; i myPointList.size(); i++)

{

MyPoint myPoint = myPointList1.get(i);

Message message = Message.obtain();

message.what = 2;

message.obj = myPoint;

mHandler.sendMessage(message);

Thread.sleep(100);

}

} catch (Exception e) {

e.printStackTrace();

}

}

相关问答

Q1: android中如何利用view视图添加一条直线

你好！

步骤1：在你创建的工程中新建一个class文件，随便起个名字叫MyView吧，打开文件会看到：

public

class

MyView

{

}

步骤2：让该类继承

View类，也就是在MyView后面添几个字母，如：

public

class

MyView

extends

View

{

}

步骤3：在上面的这个类中，写一个方法：

public

class

MyView

extends

View

{

protected

void

onDraw(Canvas

canvas)

{

..........

}

}

步骤4：在onDrow方法中写一条语句：

public

class

MyView

extends

View

{

protected

void

onDraw(Canvas

canvas)

{

canvas.drawLine(起点横坐标，起点纵坐标,终点横坐标，终点纵坐标,线的颜色);

}

}

注：看到“drawLine”了吧，这就是在画线。

如有疑问，请追问。

Q2: android 如何画一条线

public class MainActivity extends Activity {

 private ImageView iv;

 private Bitmap baseBitmap;

 private Canvas canvas;

 private Paint paint;

 @Override

 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.activity_main);

  this.iv = (ImageView) this.findViewById(R.id.iv);

  // 创建一张空白图片

  baseBitmap = Bitmap.createBitmap(480, 640, Bitmap.Config.ARGB_8888);

  // 创建一张画布

  canvas = new Canvas(baseBitmap);

  // 画布背景为灰色

  canvas.drawColor(Color.GRAY);

  // 创建画笔

  paint = new Paint();

  // 画笔颜色为红色

  paint.setColor(Color.RED);

  // 宽度5个像素

  paint.setStrokeWidth(5);

  // 先将灰色背景画上

  canvas.drawBitmap(baseBitmap, new Matrix(), paint);

  iv.setImageBitmap(baseBitmap);

  iv.setOnTouchListener(new OnTouchListener() {

   int startX;

   int startY;

   @Override

   public boolean onTouch(View v, MotionEvent event) {

    switch (event.getAction()) {

    case MotionEvent.ACTION_DOWN:

     // 获取手按下时的坐标

     startX = (int) event.getX();

     startY = (int) event.getY();

     break;

    case MotionEvent.ACTION_MOVE:

     // 获取手移动后的坐标

     int stopX = (int) event.getX();

     int stopY = (int) event.getY();

     // 在开始和结束坐标间画一条线

     canvas.drawLine(startX, startY, stopX, stopY, paint);

     // 实时更新开始坐标

     startX = (int) event.getX();

     startY = (int) event.getY();

     iv.setImageBitmap(baseBitmap);

     break;

    }

    return true;

   }

  });

 }

 public void save(View view) {

  try {

   File file = new File(Environment.getExternalStorageDirectory(),

     System.currentTimeMillis() + ".jpg");

   OutputStream stream = new FileOutputStream(file);

   baseBitmap.compress(CompressFormat.JPEG, 100, stream);

   stream.close();

   // 模拟一个广播，通知系统sdcard被挂载

   Intent intent = new Intent();

   intent.setAction(Intent.ACTION_MEDIA_MOUNTED);

   intent.setData(Uri.fromFile(Environment

     .getExternalStorageDirectory()));

   sendBroadcast(intent);

   Toast.makeText(this, "保存图片成功", 0).show();

  } catch (Exception e) {

   Toast.makeText(this, "保存图片失败", 0).show();

   e.printStackTrace();

  }

 }

}

Q3: android 百度地图上怎么画线，画圆

//代码如下

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Paint.Style;

import android.graphics.Path;

import android.graphics.Point;

import android.os.Bundle;

import com.baidu.mapapi.BMapManager;

import com.baidu.mapapi.GeoPoint;

import com.baidu.mapapi.MapActivity;

import com.baidu.mapapi.MapController;

import com.baidu.mapapi.MapView;

import com.baidu.mapapi.Overlay;

import com.baidu.mapapi.Projection;

 

public class BaiduMapActivity extends MapActivity {

        private Context mContext;

        private MapView mapView;

        @Override

        protected boolean isRouteDisplayed() {

                // TODO Auto-generated method stub

                return false;

        }

        private GeoPoint gpoint1, gpoint2, gpoint3;// 连线的点

        @Override

        protected void onCreate(Bundle arg0) {

                super.onCreate(arg0);

                setContentView(R.layout.baidumap_layout);

 

                BaseApplication baseApp = (BaseApplication) this.getApplication();

                if (baseApp.mBMapManage == null) {

                        baseApp.mBMapManage = new BMapManager(mContext);

                        baseApp.mBMapManage.init(baseApp.mStrKey,

                                        new BaseApplication.MyGeneralListener());

                }

                baseApp.mBMapManage.start();

                super.initMapActivity(baseApp.mBMapManage);// 初始化map sdk

                mapView = (MapView) findViewById(R.id.bmapView);

                mapView.setBuiltInZoomControls(true);

                // 设置在缩放动画过程中也显示overlay,默认为不绘制

                mapView.setDrawOverlayWhenZooming(true);

 

                // RouteLine routeLine =

                // (RouteLine)getIntent().getSerializableExtra("routeLine");

 

                //这里画点和连接线

                MyOverlay myOverlay = new MyOverlay();

                mapView.getOverlays().add(myOverlay);

                 

                MapController mapController = mapView.getController();

                mapController.zoomIn();

                 

                gpoint1 = new GeoPoint((int) (2259316 * 10),

                                (int) (11396279 * 10));

                gpoint2 = new GeoPoint((int) (2259245 * 10),

                                (int) (11396226 * 10));

                gpoint3 = new GeoPoint((int) (2259121 * 10),

                                (int) (11396066 * 10));                

                mapController.animateTo(gpoint1);//设置一个起点

        }

 

        class MyOverlay extends Overlay {

 

                @Override

                public void draw(Canvas canvas, MapView mapView, boolean shadow) {

                        super.draw(canvas, mapView, shadow);

                         

                        Projection projection = mapView.getProjection();

                        Point p1 = new Point();

                        Point p2 = new Point();

                        Point p3 = new Point();

                        // 经度转像素

                        projection.toPixels(gpoint1, p1);

                        projection.toPixels(gpoint2, p2);

                        projection.toPixels(gpoint3, p3);

                 

                        //第一个画笔 画圆

                        Paint fillPaint = new Paint();

                        fillPaint.setColor(Color.BLUE);

                        fillPaint.setAntiAlias(true);

                        fillPaint.setStyle(Style.FILL);

                         

                        // 将图画到上层

                        canvas.drawCircle(p1.x, p1.y, 5.0f, fillPaint);

                        canvas.drawCircle(p2.x, p2.y, 5.0f, fillPaint);

                        canvas.drawCircle(p3.x, p3.y, 5.0f, fillPaint);

 

                        //第二个画笔 画线

                        Paint paint = new Paint();

                        paint.setColor(Color.BLUE);

                        paint.setDither(true);

                        paint.setStyle(Paint.Style.STROKE);

                        paint.setStrokeJoin(Paint.Join.ROUND);

                        paint.setStrokeCap(Paint.Cap.ROUND);

                        paint.setStrokeWidth(4);

 

                        //连接

                        Path path = new Path();

                        path.moveTo(p1.x, p1.y);

                        path.lineTo(p2.x, p2.y);

                        path.lineTo(p3.x, p3.y);

                        //画出路径

                        canvas.drawPath(path, paint);

                }

        }

 

}