小编jas*_*rty的帖子

我有一个充满 LatLng 点的列表，用于在 google maps android v2 中创建多边形，但我无法弄清楚如何将此列表正确添加到 .add 区域。这是我的清单，里面有很多要点：

list.add(new LatLng(la,lo));

这是通过 Google Dev 生成的多边形

Polygon polygon = map.addPolygon(new PolygonOptions()
.add(*******HOW TO ITTERATE LIST************).strokeColor(Color.RED)
.fillColor(Color.BLUE));

你是怎么加分的？

使用 ListView.separated 我们可以在列表项之间添加 Divider()，但是，一旦我转换到 SliverList，我就看不到我的分隔线。

delegate: SliverChildBuilderDelegate(
            // displays the index of the current item.
            (context, index) => new ListTile(
              title: Text(_sagItems[index].manufacturer, style: TextStyle(fontSize: 18),),
              subtitle: Text(_sagItems[index].model, style: TextStyle(fontSize: 16)),
                onTap: () {
                  Navigator.push(
                    context,
                    MaterialPageRoute(
                      builder: (context) => DetailScreen(sagitem: _sagItems[index]),
                    ),
                  );
                },
              ),
              //DIVIDER NOT WORKING HERE
              Divider(color: Colors.blueGrey),
              childCount: _sagItems.length,
          ),

用 SliverList 添加分隔线的关键是什么？

除非我删除这个,否则我会收到例外:

机器人:targetSdkVersion = "15"

我在SO的另一个帖子中找到了.

但是,我已经在那里使用了targetSdkVersion运行了几天.这是我的代码:

public class MainActivity extends BaseActivity {
    private TextView textView;
    private String url = "http://www.backcountryskiers.com/sac/sac-full.html";
    private ImageView image;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView) findViewById(R.id.todaysReport);
        image = (ImageView) findViewById(R.id.dangerRose);

        fetcher task = new fetcher();
        task.execute();
    }

    public static Bitmap getBitmapFromURL(String src) {
        try {
            Log.e("src", src);
            URL url = new URL(src);
            HttpURLConnection connection = (HttpURLConnection) url
                    .openConnection();
            connection.setDoInput(true);
            connection.connect();
            InputStream input = connection.getInputStream();
            Bitmap myBitmap = BitmapFactory.decodeStream(input);
            Log.e("Bitmap", "returned");
            return …

我有一个Async正在运行以从我创建的页面获取数据.它得到的文本很好,但当我尝试通过另一个类从图像src获取图像时,应用程序强制关闭.以下是强制关闭的代码:

public class FullReportActivity extends NavigationActivity {
    private TextView textView;
    private String url = "http://www.backcountryskiers.com/sac/sac-full.html";
    private ImageView ivDangerRose;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        // tell which region this covers
        getSupportActionBar().setSubtitle("...from Sierra Avalanche Center");
        setContentView(R.layout.activity_fullreport);
        textView = (TextView) findViewById(R.id.todaysReport);
        ivDangerRose = (ImageView) findViewById(R.id.dangerRose);
        fetcher task = new fetcher();
        task.execute();
    }

    // GET THE IMAGE and RETURN IT
    public static Bitmap getBitmapFromURL(String src) {
        try {
            URL url = new URL(src);
            HttpURLConnection connection = (HttpURLConnection) url
                    .openConnection();
            connection.setDoInput(true);
            connection.connect(); …