Android对不起应用程序已意外停止

Question

The following code works fine without any errors but when i try to get the url through intent i get the error the application stopped unexpectedly. can anyone please help me out.

public class MjpegSample extends Activity {
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        String URL = "http://121.6.98.160:8081/videostream.cgi?"
                   + "user=admin&pwd=admin&resolution=8"; 
    }
}

The following code make the error when i replace the above code:

public class MjpegSample extends Activity {
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        String URL;
        Bundle extras = getIntent().getExtras();
        URL = extras.getString("flink");
    }
}

To get the "flink" by intent i use the following

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    b1 = (Button) findViewById(R.id.viewcam);
    t=(EditText)findViewById(R.id.username);
    p=(EditText)findViewById(R.id.password);
    i=(EditText)findViewById(R.id.ip);
    po=(EditText)findViewById(R.id.port);
    b1.setOnClickListener(new OnClickListener()
    {
        public void onClick(View v)
        {
            String tt=t.getText().toString();
            String pp=p.getText().toString();
            String ii=i.getText().toString();
            String por=po.getText().toString();
            String link="http://"+ii+":"+por
                       +"/videostream.cgi?user="+tt
                       +"&pwd="+pp+"resolution=8";
            Intent myIntent = new Intent(v.getContext(), MjpegSample.class);
            myIntent.putExtra("flink",link);
            startActivityForResult(myIntent, 0);                

        }
    });
}

Answer 1

Try to replace v.getContext() with NameOfCurrentActivity.this , Also check in the other Activity:

if (extras != null)
{
    // do your thing
}

Answer 2

您应该直接从意图而不是从额外内容获得url：

getIntent().getString("flink")