Question

完全停止保存并恢复活动的实例状态。这就是我所拥有的：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_register1);

    context = this;

    input_first_name = (EditText) findViewById(R.id.first_name);
    input_last_name = (EditText) findViewById(R.id.last_name);
    input_email = (EditText) findViewById(R.id.register_email);
    input_password = (EditText) findViewById(R.id.register_password);
    input_cell = (EditText) findViewById(R.id.register_cell);

    if (savedInstanceState != null) {
        System.err.println(savedInstanceState.getString("first_name"));
        input_first_name.setText(savedInstanceState.getString("first_name"));
        input_last_name.setText(savedInstanceState.getString("last_name"));
        input_email.setText(savedInstanceState.getString("email"));
        input_password.setText(savedInstanceState.getString("password"));
        input_cell.setText(savedInstanceState.getString("cell"));
    }
    ...
}

protected void onSaveInstanceState(Bundle b) {
    super.onSaveInstanceState(b);
    System.err.println("save called");

    b.putString("first_name", first_name);
    b.putString("last_name", last_name );
    b.putString("email", email);
    b.putString("password", password);
    b.putString("cell", cell);
}

protected void onRestoreInstanceState(Bundle b) {
    System.err.println(b.getString("first_name"));
    input_first_name.setText(b.getString("first_name"));
    input_last_name.setText(b.getString("last_name"));
    input_email.setText(b.getString("email"));
    input_password.setText(b.getString("password"));
    input_cell.setText(b.getString("cell"));
}

我正在获取“save called”的输出，所以我认为我的包已正确保存。但是，当我回到活动中时，我从未看到任何输出。有谁看到我做错了什么？谢谢！

Answer 1

我真的没有看错添加@Override以确保它在您的类中调用该函数而不是超类中的函数

如下：

@Override
protected void onSaveInstanceState(Bundle b) {
super.onSaveInstanceState(b);
System.err.println("save called");

b.putString("first_name", first_name);
b.putString("last_name", last_name );
b.putString("email", email);
b.putString("password", password);
b.putString("cell", cell);
}

Answer 2

请尝试this solution以确保正确使用onRestoreInstanceState。

Android：保存/恢复实例状态

2 个答案: