android 中如何畫一條動態的畫一條直線.(即從A到慢慢運動到B點的軌跡，走過后軌跡是一條線)

首先找到這條直線的所有點，然后開啟一個線程循環獲取點，用Handle發送消息去畫線

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@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();

}

}

android中如何利用view視圖添加一條直線

你好！

步驟1：在你創建的工程中新建一個class文件，隨便起個名字叫MyView吧，打開文件會看到：

public

class

MyView

{

}

步驟2：讓該類繼承

View類，也就是在MyView后面添幾個字母，如：

public

class

MyView

extends

View

{

}

步驟3：在上面的這個類中，寫一個方法：

public

class

MyView

extends

View

{

protected

void

onDraw(Canvas

canvas)

{

..........

}

}

步驟4：在onDrow方法中寫一條語句：

public

class

MyView

extends

View

{

protected

void

onDraw(Canvas

canvas)

{

canvas.drawLine(起點橫坐標，起點縱坐標,終點橫坐標，終點縱坐標,線的顏色);

}

}

注：看到“drawLine”了吧，這就是在畫線。

如有疑問，請追問。

android 如何畫一條線

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);

// 創建一張空白圖片

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

// 創建一張畫布

canvas = new Canvas(baseBitmap);

// 畫布背景為灰色

canvas.drawColor(Color.GRAY);

// 創建畫筆

paint = new Paint();

// 畫筆顏色為紅色

paint.setColor(Color.RED);

// 寬度5個像素

paint.setStrokeWidth(5);

// 先將灰色背景畫上

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:

// 獲取手按下時的坐標

startX = (int) event.getX();

startY = (int) event.getY();

break;

case MotionEvent.ACTION_MOVE:

// 獲取手移動后的坐標

int stopX = (int) event.getX();

int stopY = (int) event.getY();

// 在開始和結束坐標間畫一條線

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

// 實時更新開始坐標

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();

// 模擬一個廣播，通知系統sdcard被掛載

Intent intent = new Intent();

intent.setAction(Intent.ACTION_MEDIA_MOUNTED);

intent.setData(Uri.fromFile(Environment

.getExternalStorageDirectory()));

sendBroadcast(intent);

Toast.makeText(this, "保存圖片成功", 0).show();

} catch (Exception e) {

Toast.makeText(this, "保存圖片失敗", 0).show();

e.printStackTrace();

}

}

}

android 百度地圖上怎么畫線，畫圓

//代碼如下

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;//?連線的點

@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);

//?設置在縮放動畫過程中也顯示overlay,默認為不繪制

mapView.setDrawOverlayWhenZooming(true);

//?RouteLine?routeLine?=

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

//這里畫點和連接線

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);//設置一個起點

}

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();

//?經度轉像素

projection.toPixels(gpoint1,?p1);

projection.toPixels(gpoint2,?p2);

projection.toPixels(gpoint3,?p3);

//第一個畫筆?畫圓

Paint?fillPaint?=?new?Paint();

fillPaint.setColor(Color.BLUE);

fillPaint.setAntiAlias(true);

fillPaint.setStyle(Style.FILL);

//?將圖畫到上層

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);

//第二個畫筆?畫線

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);

//連接

Path?path?=?new?Path();

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

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

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

//畫出路徑

canvas.drawPath(path,?paint);

}

}

}

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