android - 跨屏幕旋转保持 View

Question

Android 新手，所以我正在编写小程序以熟悉其工作原理。到目前为止，让我头疼的是在运行时结合屏幕旋转创建的 View 。

在尝试使用包裹时运气不佳后，我通过在旋转后重新创建 View 解决了这个问题。

程序会将输入的文本作为 TextView 添加到 EditText 下面的 TableLayout。

有没有更好的方法来解决这个问题？我找不到任何“开箱即用”的方法来执行此操作。

public class MWEActivity extends Activity {
    TableLayout table;
    EditText txtInput;
    ArrayList<String> savedEntry = new ArrayList<String>();

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        table = (TableLayout)this.findViewById(R.id.table);
        txtInput = (EditText)this.findViewById(R.id.txtInput);

        txtInput.setOnEditorActionListener(new OnEditorActionListener() {

            public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
                if(event.getKeyCode() == KeyEvent.KEYCODE_ENTER && event.getAction() == KeyEvent.ACTION_DOWN){
                        TextView newtext = new TextView(getApplicationContext());
                        newtext.setText(txtInput.getText());
                        savedEntry.add(newtext.getText().toString());
                        table.addView(newtext);
                        txtInput.setText("");
                        return true;
                }
                return false;
            }
        });
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        outState.putStringArrayList("entry", savedEntry);
        super.onSaveInstanceState(outState);
    }

    @Override
    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        if(savedInstanceState.getStringArrayList("entry") == null){
            savedEntry = new ArrayList<String>();
            savedEntry.add("Return was NULL");
        }else{
            savedEntry = savedInstanceState.getStringArrayList("entry");
        }

        for(String s : savedEntry){
            TextView tv = new TextView(getApplicationContext());
            tv.setText(s);
            table.addView(tv);
        }
        super.onRestoreInstanceState(savedInstanceState);
    }
}

Answer 1

要么你必须像之前的答案那样禁用方向改变，要么就依赖在标准设施上。它会暂停然后重新创建您的 Activity 。不需要额外的代码。您还可以为不同的方向提供不同的布局:

http://developer.android.com/guide/practices/screens_support.html