由於百度的InfoWindow只能展示一個，marker卻不受限制，因此換了一個思路，在網上搜集了許多資料，最終實驗成功。

通過建立一個自定義的bitmap然後以marker的形式新增到地圖上。

在xml中，只有一個地圖控制元件，因為手邊沒有真機，就用模擬器進行測試的，地圖是用的是TextureMapView使用預設的MapVIew會報錯。

<?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>

public class MainActivity extends AppCompatActivity {

    private TextureMapView bmapView;
    private BaiduMap mBaiduMap;
    private BitmapDescriptor mIconMarker;
    private 
 
Bitmap bitmap = null;
    private List<LatLng> latList = new ArrayList<>();
// 天安門座標
private double mLat1 = 39.915291;
    private double mLon1 = 116.403857;
// 百度大廈座標
private double mLat2 = 40.056858;
    private double mLon2 = 116.308194;
// 西湖座標
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各元件之前初始化context資訊，傳入ApplicationContext
        //注意該方法要再setContentView方法之前實現
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 + "個框");
}

        updateMap();
}

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

    private void showMarker(LatLng latLng, String str) {
        // 建立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的獲取寬高
bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_4444); //建立一個空的Bitmap
bitmap = scaleWithWH(bitmap, width * scale, height * scale);//縮放
        //畫筆進行新增文字（強烈推薦啟艦的自定義控制元件三部曲http://blog.csdn.net/harvic880925/article/details/50995268）
Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);//抗鋸齒
paint.setDither(true); // 獲取跟清晰的影象取樣
paint.setFilterBitmap(true);// 過濾
paint.setColor(Color.RED);
paint.setTextSize(14 * scale);
Rect bounds = new Rect();
paint.getTextBounds(str, 0, str.length(), bounds);//獲取文字的範圍
        //文字在mMarker中展示的位置
float paddingLeft = (bitmap.getWidth() - bounds.width()) / 2;//在中間
float paddingTop = (bitmap.getHeight() / scale);//在頂部
Canvas canvas = new Canvas(bitmap);
canvas.drawText(str, paddingLeft, paddingTop, paint);
//合併兩個bitmap為一個
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 {
            // 記錄src的寬高
int width = src.getWidth();
            int height = src.getHeight();
// 建立一個matrix容器
Matrix matrix = new Matrix();
// 計算縮放比例
float scaleWidth = (float) (w / width);
            float scaleHeight = (float) (h / height);
// 開始縮放
matrix.postScale(scaleWidth, scaleHeight);
// 建立縮放後的圖片
return Bitmap.createBitmap(src, 0, 0, width, height, matrix, true);
}
    }

    private void gc() {
        if (bitmap != null) {
            // 回收並且置為null
bitmap.recycle();
bitmap = null;
}
        System.gc();
}
}