Java 如何检查AutoCompleteTextView是否包含文本？

我有两个用户应该填写的自动完成文本视图片段。然后，必须将这两个字符串值发送到其他活动，否则（如果没有填充），您应该看到一个toast。我试图实现它，但它不起作用：

public void onFindPathClick(View view) {
    String originAddress = OriginPlaceFragment.mAutoPlaceSearch.getText().toString();
    String destinationAddress = DestinationPlaceFragment.mAutoPlaceSearch.getText().toString();

    Intent intent = new Intent(SimpleTabsActivity.this, MapsActivity.class);
    if ((originAddress != "") && (!originAddress.equals(null)) && (destinationAddress != "") && (!destinationAddress.equals(null))) {
        intent.putExtra(ORIGIN_ADDRESS, originAddress);
        intent.putExtra(DESTIN_ADDRESS, destinationAddress);
        startActivity(intent);
    } else {
        Toast.makeText(this, "Fill \"from\" and \"to\" fields", Toast.LENGTH_SHORT).show();
    }
}

使用isEmpty（）方法代替检查（originAddress！=“”）

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如果出现异常，会发生什么。我希望onFindPathClick绑定到一个事件？

public void onFindPathClick(View view) {
String originAddress = OriginPlaceFragment.mAutoPlaceSearch.getText().toString();
String destinationAddress = DestinationPlaceFragment.mAutoPlaceSearch.getText().toString();

Intent intent = new Intent(SimpleTabsActivity.this, MapsActivity.class);
if (!originAddress.toString().isEmpty() && !destinationAddress.toString().isEmpty()) {
    intent.putExtra(ORIGIN_ADDRESS, originAddress);
    intent.putExtra(DESTIN_ADDRESS, destinationAddress);
    startActivity(intent);
} else {
    Toast.makeText(this, "Fill \"from\" and \"to\" fields", Toast.LENGTH_SHORT).show();
}
}