Question

您好我的应用程序有问题。当我为Android 2.2或更低版本创建一个新项目时，我的应用程序工作正常，我的toast在屏幕上显示但是当我使用相同的代码创建2.3或2.3.3的新项目时，toast根本不会出现。此外，我在主OnCreate线程中添加了Textview更新，但我仍然没有更新textview。我主要是要解决吐司问题。感谢

public class Location extends Activity  {
/** Called when the activity is first created. */
static String Text;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    LocationManager lm = (LocationManager)getSystemService(Context.LOCATION_SERVICE); 
    final TextView tv = (TextView)findViewById(R.id.textView1);

    lm.requestLocationUpdates( LocationManager.GPS_PROVIDER, 0, 0, new LocationListener() {



    private final String TAG = null;

    @Override
    public void onLocationChanged(android.location.Location location) {
        // TODO Auto-generated method stub

       Text = "My current location is: " + "Latitud = " + location.getLatitude() + "Longitud = "   + location.getLongitude(); 
       Context context = getApplicationContext();
       int duration = Toast.LENGTH_SHORT;
       Toast.makeText(context, Text, duration).show();
            tv.setText(Text);
        try
        {
            File root = Environment.getExternalStorageDirectory();
            File gps = new File(root, "log.txt");




        BufferedWriter out = new BufferedWriter(
                new FileWriter(gps,true)) ;

        out.write(Text);
        out.write("");
        out.close();

        }


        catch (IOException e) {


            Log.e(TAG, "Could not write file " + e.getMessage());

        }
    }

Answer 1

你必须在Toast上调用show（）。

Toast.makeText(context, Text, duration).show();

你所做的只是制作吐司而不是展示它。

由于异常，TextView更新可能会失败。

Android 2.3.3上的Toast Widget

1 个答案: