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Android幾秒後自動關閉dialog

AlertDialog.Builder builder = new AlertDialog.Builder(v.getContext());
                builder.setTitle("發送成功！");
                builder.setMessage("2秒後自動關閉！");
                builder.setCancelable(true);
                final AlertDialog dlg = builder.create();
                dlg.show();
                final Timer t = new Timer();
                t.schedule(new TimerTask() {
                    public void run() {
                        Intent intent1 = new Intent();
                        intent1.setClass(InquirySheetListActivity.this, MainActivity.class);
                        startActivity(intent1);
                        finish();
                        dlg.dismiss();
                        t.cancel();
                    }
                }, 2000);

AlertDialog.Builder builder = new AlertDialog.Builder(v.getContext());
builder.setTitle("發送成功！");
builder.setMessage("2秒後自動關閉！");
builder.setCancelable(true);
final AlertDialog dlg = builder.create();
dlg.show();
final Timer t = new Timer();
t.schedule(new TimerTask() {
    public void run() {
        Intent intent1 = new 
 
Intent();
        intent1.setClass(InquirySheetListActivity.this, MainActivity.class);
        startActivity(intent1);
        finish();
        dlg.dismiss();
        t.cancel();
    }
}, 2000);

Android幾秒後自動關閉dialog