Android/Java - 自定義在Google地圖上查看FragmentActivity未顯示

我試圖畫一些東西在自定義視圖中進行測試，該視圖添加到GoogleMaps FragmentActivity中。但不知何故，當我在模擬器中運行它時，它看起來像我的CustomView不是繪圖。我嘗試了一個新的RelativeLayout和一個MapLayout。有任何想法嗎？我做錯了什麼？Android/Java - 自定義在Google地圖上查看FragmentActivity未顯示

public class GoogleMaps extends FragmentActivity implements OnMapReadyCallback { 

private GoogleMap mMap; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.google_maps); 
    // Obtain the SupportMapFragment and get notified when the map is ready to be used. 
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() 
      .findFragmentById(R.id.map); 
    mapFragment.getMapAsync(this); 

    //RelativeLayout relativeLayout = new RelativeLayout(this); 
    //relativeLayout.addView(new SpriteLayer(this)); 

    MapView map = new MapView(this); 
    map.addView(new SpriteLayer(this)); 

} 

@Override 
public void onMapReady(GoogleMap googleMap) { 
    mMap = googleMap; 

    // Add a marker in Sydney and move the camera 
    LatLng sydney = new LatLng(-34, 151); 
    mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney")); 
    mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney)); 
} 
}

這就是我的CustomView代碼：

繼承人我主要的GoogleMaps FragmentActivity碼，從Android的模板自動生成

public class SpriteLayer extends View { 

Paint paint = new Paint(); 

public SpriteLayer(Context context) { 
    super(context); 

    setWillNotDraw(false); 

} 

@Override 
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 

    int desiredWidth = 100; 
    int desiredHeight = 100; 

    int widthMode = MeasureSpec.getMode(widthMeasureSpec); 
    int widthSize = MeasureSpec.getSize(widthMeasureSpec); 
    int heightMode = MeasureSpec.getMode(heightMeasureSpec); 
    int heightSize = MeasureSpec.getSize(heightMeasureSpec); 

    int width; 
    int height; 

    //Measure Width 
    if (widthMode == MeasureSpec.EXACTLY) { 
     //Must be this size 
     width = widthSize; 
    } else if (widthMode == MeasureSpec.AT_MOST) { 
     //Can't be bigger than... 
     width = Math.min(desiredWidth, widthSize); 
    } else { 
     //Be whatever you want 
     width = desiredWidth; 
    } 

    //Measure Height 
    if (heightMode == MeasureSpec.EXACTLY) { 
     //Must be this size 
     height = heightSize; 
    } else if (heightMode == MeasureSpec.AT_MOST) { 
     //Can't be bigger than... 
     height = Math.min(desiredHeight, heightSize); 
    } else { 
     //Be whatever you want 
     height = desiredHeight; 
    } 

    //MUST CALL THIS 
    setMeasuredDimension(width, height); 

} 

@Override 
public void onDraw(Canvas canvas) { 

    paint.setColor(Color.GREEN); 
    Rect rect = new Rect(20, 56, 200, 112); 
    canvas.drawRect(rect, paint); 

    Log.println(Log.ERROR,"Test ","One"); 
} 
}

目前我只看到了標準地圖，上面有一個標記，還沒有矩形:(

來源

2017-02-10 genaray

您需要測量所需視圖的大小。你只是通過你正在收到，可能是0.

另一種選擇是設置一個LayoutParams與MATCH_PARENT，但我不知道這是否會工作。

你想要做的是先進的，你應該在嘗試之前閱讀一些教程。

來源

2017-02-10 16:20:25 jonathanrz

謝謝你的快速答案！我看了一下，做了幾次嘗試。也沒有工作。我要添加自定義視圖嗎？或者是有邏輯錯誤。我沒有發現很多關於它的文章。另外我編輯了我的問題:) – genaray

您仍然使用收到的參數調用super.onMeasure。你不需要調用它。 – jonathanrz

所以我刪除它並再次測試，仍然沒有： - /。任何其他想法？ – genaray

Android/Java - 自定義在Google地圖上查看FragmentActivity未顯示

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