百度地图多个InfoWindow同时展示

由于百度的InfoWindow只能展示一个，marker却不受限制，因此换了一个思路，在网上搜集了许多资料，最终实验成功。

通过创建一个自定义的bitmap然后以marker的形式添加到地图上。



在xml中，只有一个地图控件，因为手边没有真机，就用模拟器进行测试的，地图是用的是TextureMapView使用默认的MapVIew会报错。

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.pistol.markerinfos.MainActivity">

<com.baidu.mapapi.map.TextureMapView
android:id="@+id/bmapView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:clickable="true" />

</RelativeLayout>

activity内容如下图：

public class MainActivity extends AppCompatActivity {

private TextureMapView bmapView;
private BaiduMap mBaiduMap;
private BitmapDescriptor mIconMarker;
private Bitmap bitmap = null;

private List<LatLng> latList = new ArrayList<>();

// 天安门坐标
private double mLat1 = 39.915291;
private double mLon1 = 116.403857;
// 百度大厦坐标
private double mLat2 = 40.056858;
private double mLon2 = 116.308194;
// 西湖坐标
private double mLat3 = 30.2446230000;
private double mLon3 = 120.1517040000;

private LatLng loc_start;
private LatLng loc_end;
private LatLng loc_position;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//在使用SDK各组件之前初始化context信息，传入ApplicationContext
//注意该方法要再setContentView方法之前实现
SDKInitializer.initialize(getApplicationContext());
setContentView(R.layout.activity_main);
initView();
initData();
}

private void initView() {
bmapView = (TextureMapView) findViewById(R.id.bmapView);
mBaiduMap = bmapView.getMap();

mIconMarker = BitmapDescriptorFactory.fromResource(R.mipmap.ic_launcher);
}

int i = 0;

private void initData() {
loc_start = new LatLng(mLat1, mLon1);
loc_end = new LatLng(mLat2, mLon2);
loc_position = new LatLng(mLat3, mLon3);

latList.add(loc_start);
latList.add(loc_end);
latList.add(loc_position);

for (LatLng position : latList) {
i++;
showMarker(position, "第" + i + "个框");
}

updateMap();
}

private void updateMap() {
mBaiduMap.setOnMapLoadedCallback(new BaiduMap.OnMapLoadedCallback() {
@Override
public void onMapLoaded() {
//仿照zoomToSpan()写的自适应
LatLngBounds.Builder builder = new LatLngBounds.Builder();
for (int i = 0; i < latList.size(); i++) {
builder.include(latList.get(i));
}
//更新地图
mBaiduMap.animateMapStatus(MapStatusUpdateFactory
.newLatLngBounds(builder.build()));
}
});
}

private void showMarker(LatLng latLng, String str) {
// 创建bitmap
drawBitMap(str);

OverlayOptions option = new MarkerOptions().position(latLng).icon(BitmapDescriptorFactory.fromBitmap(bitmap));
if (mBaiduMap != null) {
mBaiduMap.addOverlay(option);
}
gc();
}

private void drawBitMap(String str) {
float scale = this.getResources().getDisplayMetrics().density;
Log.e("scale", "=" + scale);
int width = mIconMarker.getBitmap().getWidth(), height = mIconMarker.getBitmap().getHeight();//marker的获取宽高
bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_4444); //建立一个空的Bitmap
bitmap = scaleWithWH(bitmap, width * scale, height * scale);//缩放
//画笔进行添加文字（强烈推荐启舰的自定义控件三部曲http://blog.csdn.net/harvic880925/article/details/50995268）
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);//抗锯齿
paint.setDither(true); // 获取跟清晰的图像采样
paint.setFilterBitmap(true);// 过滤
paint.setColor(Color.RED);
paint.setTextSize(14 * scale);

Rect bounds = new Rect();
paint.getTextBounds(str, 0, str.length(), bounds);//获取文字的范围
//文字在mMarker中展示的位置
float paddingLeft = (bitmap.getWidth() - bounds.width()) / 2;//在中间
float paddingTop = (bitmap.getHeight() / scale);//在顶部

Canvas canvas = new Canvas(bitmap);
canvas.drawText(str, paddingLeft, paddingTop, paint);

//合并两个bitmap为一个
canvas.drawBitmap(mIconMarker.getBitmap(), paddingLeft, paddingTop, null);//marker的位置
}

private Bitmap scaleWithWH(Bitmap src, double w, double h) {
if (w == 0 || h == 0 || src == null) {
return src;
} else {
// 记录src的宽高
int width = src.getWidth();
int height = src.getHeight();
// 创建一个matrix容器
Matrix matrix = new Matrix();
// 计算缩放比例
float scaleWidth = (float) (w / width);
float scaleHeight = (float) (h / height);
// 开始缩放
matrix.postScale(scaleWidth, scaleHeight);
// 创建缩放后的图片
return Bitmap.createBitmap(src, 0, 0, width, height, matrix, true);
}
}

private void gc() {
if (bitmap != null) {
// 回收并且置为null
bitmap.recycle();
bitmap = null;
}
System.gc();
}
}

参考博客：http://blog.csdn.net/dawanganban/article/details/51148070