Question

我对android编程比较陌生。目前正在使用eclipse，我遇到了问题。

我被要求编写一个名为clockin的按钮，此按钮将检查“允许非工作站点”是否进入。这意味着在打开此应用程序时，此按钮将自动检查是否允许非工作站点。如果允许，它将进行身份验证，否则将检查其在工地和当前位置之间的距离。如果在范围内，启用按钮，如果没有禁用按钮。

这可能听起来相当复杂，但我的任务是尽快完成。

我的代码如下：

public class MainActivity extends Activity {

EditText txtusername;
EditText txtpassword;
Button btnclockin;
Button btnclockout;
GPSTracker gps;


/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    txtusername=(EditText)this.findViewById(R.id.username);
    txtpassword=(EditText)this.findViewById(R.id.password);
    btnclockin=(Button)this.findViewById(R.id.clockin);
    btnclockout=(Button)this.findViewById(R.id.clockout);
    btnclockin.setOnClickListener(new OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub

if((txtusername.getText().toString()).equals(txtpassword.getText().toString())){

Calendar c1 = Calendar.getInstance();
SimpleDateFormat sdf1 = new SimpleDateFormat("dd/MM/yyyy   hh:mm");
String strdate1 = sdf1.format(c1.getTime());

TextView txtdate1 = (TextView) findViewById(R.id.textView1);
txtdate1.setText(strdate1);

gps = new GPSTracker(MainActivity.this);

// check if GPS enabled
if(gps.canGetLocation()){

    double latitude = gps.getLatitude();
    double longitude = gps.getLongitude();

    // \n is for new line
    Toast.makeText(getApplicationContext(), "You have clock in succesfully at \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
}else{
    // can't get location
    // GPS or Network is not enabled
    // ask user to enable GPS/Network in settings
    gps.showSettingsAlert();

}
   } else{
    Toast.makeText(MainActivity.this, "Invalid Username//Password",Toast.LENGTH_LONG).show();
   }

}
}) ;     



btnclockout.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
    // TODO Auto-generated method stub

    if((txtusername.getText().toString()).equals(txtpassword.getText().toString())){

        Calendar c1 = Calendar.getInstance();
        SimpleDateFormat sdf1 = new SimpleDateFormat("d/M/yy h:m a");
        String strdate1 = sdf1.format(c1.getTime());

        TextView txtdate1 = (TextView) findViewById(R.id.textView1);
        txtdate1.setText(strdate1);

        gps = new GPSTracker(MainActivity.this);

        // check if GPS enabled
        if(gps.canGetLocation()){


            double latitude = gps.getLatitude();
            double longitude = gps.getLongitude();


            // \n is for new line
            Toast.makeText(getApplicationContext(), "You have clocked out successfully at \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
        }else{
            // can't get location
            // GPS or Network is not enabled
            // ask user to enable GPS/Network in settings
            gps.showSettingsAlert();

        }

           } else{
            Toast.makeText(MainActivity.this, "Invalid Username//Password",Toast.LENGTH_LONG).show();
           }





};
});
} 


}

Answer 1

如果符合条件，请尝试此yourButton.setEnabled(true); true，否则false。如果需要，您可以添加此yourButton.setClickable(true);。

Answer 2

if (condition) {
    btn.setEnabled(true);
    btn.setOnClickListner(new ViewOnClickListener() {
        @Override
        public void onClick(final View v) {
            // your code here
        }
    });
} else {
    btn.setEnabled(false);
}

根据特定条件禁用和启用按钮

2 个答案: