[英]Display a specific line in a text file - android/java
我正在尝试构建一个显示来自文本文件的有趣事实的应用程序。 为此,我得到一个随机数,然后从文件中显示该特定行号。当我运行应用程序并尝试按按钮时,我得到的只是一个空白文本字段。 这是我的代码:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fun_facts);
// Declare and assign variables
final TextView factLabel = (TextView) findViewById(R.id.factTextView);
Button showFactButton = (Button) findViewById(R.id.showFactButton);
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View v) {
/*
code here runs when button click is detected by line 29
code shows new fact
*/
String fact = "";
//get a random number to select a fact
Random randomNumberGenrator = new Random();//construct random object
int randomNumber = randomNumberGenrator.nextInt(391);
FileReader fr = null;
try {
fr = new FileReader("facts.txt ");//construct filereader and assign file
} catch (FileNotFoundException e) {
e.printStackTrace();//exception raised
}
LineNumberReader getFact = new LineNumberReader(fr);//construct lineNumberReader
getFact.setLineNumber(randomNumber);//set current line number to random number
try {
fact = getFact.readLine();//read current line and assign it to fact
} catch (IOException e) {
e.printStackTrace();
}
factLabel.setText(fact);
try {
getFact.close();//close lineReader
} catch (IOException e) {
e.printStackTrace();
}
try {
fr.close();//close fileReader
} catch (IOException e) {
e.printStackTrace();
}
}
};
showFactButton.setOnClickListener(listener);
}
你有什么错误吗?
检查此行,也许是它的错字,但值得检查,并从路径中删除该空间。 OLD:fr = new FileReader(“ facts.txt”); 新:fr =新的FileReader(“ facts.txt”);
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