java - 保存安卓 Activity 状态

Question

我刚学Android编程，遇到一个问题。

我使用以编程方式添加的复选框小部件创建 Activity ，或者如果用户触摸添加按钮 (tambah) 将添加复选框小部件，问题是如何保存状态 Activity ？

主 Activity .java

public class MainActivity extends Activity {

// Variable Global
int checkId = 0; //CheckBox Id
EditText ex;
TextView noText;
LinearLayout m;
CheckBox check;
CheckBox noCheck;
String dat;
Toast errorNot;

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

public void funcOne(View view) {

    /**
     * tambah.onClick function
     * @param ex - EditText variable
     * @param noText - TextView variable used for spacing
     * @param m - CheckBox main layout
     * @param check - Generated CheckBox widget
     * @param noCheck - Toggle between CheckBox and EditText
     * @param dat - EditText variable converted to String
     * @param errorNot - To display noData error
     */

    ex = (EditText)findViewById(R.id.editData);
    noText = new TextView(this);
    m = (LinearLayout)findViewById(R.id.checkBoxLayout);
    check = new CheckBox(this);
    noCheck = (CheckBox)findViewById(R.id.noCheck);
    dat = ex.getText().toString();
    errorNot = Toast.makeText(this, "No input data", Toast.LENGTH_LONG);

    // Method
    if (dat.length() > 1) {
        if (noCheck.isChecked()) {
            noText.setText(dat);
            m.addView(noText);
        } else {

            /**
             * @param n - New Toast (Only for debugging)
             */

            checkId ++;
            Toast n = Toast.makeText(this, Integer.toString(checkId), Toast.LENGTH_SHORT);
            check.setTag("ch"+checkId);
            check.setText(dat + " <WidgetTag " +check.getTag() + ">");
            m.addView(check);
            n.show();
        }
    } else {
        errorNot.show();
    }
}

public void addSpace(View view) {

    /**
     * space.onClick function
     * @param b - Child layout
     * @param d - TextView
     */

    LinearLayout b = (LinearLayout)findViewById(R.id.checkBoxLayout);
    TextView d = new TextView(this);
    b.addView(d);
}

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    //outState.putBoolean("AstringKey", noCheck);
    outState.putString("AStringKey2", dat);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    //savedInstanceState.getBoolean("AStringKey");
    savedInstanceState.getString("AStringKey2");
}

应用布局: http://imgur.com/gallery/1ZfJ5QL

Answer 1

每个 Activity 中的 onCreate() 方法都有一个 Bundle 参数。您可以在其中保存实例。您可以在 onPause() 中编写代码，以便在完成 Activity 之前它会存储您的内容。您可以使用相同的包再次访问它