我刚开始在android学习编程,在onSaveInstanceState
使用变量有问题。这是我的代码:
int resultCode;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
if (savedInstanceState != null) {
super.onRestoreInstanceState(savedInstanceState);
int resultCode = savedInstanceState.getInt("resultCode");
}
Button btnOpenWithResult = (Button) findViewById(R.id.btnOpenWithResult);
btnOpenWithResult.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Intent myIntent = new Intent(flashlight.this, ThirdActivity.class);
startActivityForResult(myIntent, 1);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
switch (resultCode) {
case 1:
/** option 1 */
break;
case 2:
/** option 2 */
break;
}
@Override
public void onSaveInstanceState(Bundle savedInstanceState) {
savedInstanceState.putInt("resultCode", resultCode);
super.onSaveInstanceState(savedInstanceState);
}
我想使用onSaveInstanceState
保存变量resultCode
,并在活动恢复后再次使用它……
(对我的英语水平感到抱歉)
发布于 2011-02-21 10:27:04
赛伦..。1)我认为没有理由在onCreate中调用super.onRestoreInstanceState。在该方法中进行调用将是有意义
public void onRestoreInstanceState(Bundle saved) {
super.onRestoreInstanceState(saved);
2)声明:
int resultCode = savedInstanceState.getInt("resultCode");
就是“隐藏”变量:
int resultCode;
之前声明的。所以有两个不同作用域的变量resultCode版本。也许你的意思是编写代码:
int resultCode;
stuff here
resultCode = savedInstanceState.getInt("resultCode");
希望这能有所帮助,日航
https://stackoverflow.com/questions/4701275
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