Question

android的Activity跳转，一直提示我有空指针..

public class Activity03 extends Activity {
/** Called when the activity is first created. */

private EditText number1 = null;
private EditText number2 = null;
private TextView chuhao = null;
private Button getResult = null;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

//根据控件的ID来取得代表控件的对象
number1 = (EditText)findViewById(R.id.number1);
number2 = (EditText)findViewById(R.id.number2);
chuhao = (TextView)findViewById(R.id.chuhao);
getResult = (Button)findViewById(R.id.getResult);

//将监听器绑定在按钮对象上面
getResult.setOnClickListener(new getResultOnClickListener());

chuhao.setText(R.string.chuhao);
getResult.setText(R.string.getResult);

}
//监听器
class getResultOnClickListener implements OnClickListener{

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//取得两个计算的数值

String number1Str = number1.getText().toString();
String number2Str = number2.getText().toString();
//将这两个值存放到Intent对象中
Intent intent = new Intent();

int number1Int = Integer.parseInt(number1Str);
int number2Int = Integer.parseInt(number2Str);
int result = number1Int/number2Int;
intent.putExtra("result",result);
//使用Intent对象启动ResultActivity
intent.setClass(Activity03.this, ResultActivity.class);
Activity03.this.startActivity(intent);
}
}

}
----------------------

另一个Activity

public class ResultActivity extends Activity{

private TextView resultView;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
setContentView(R.layout.result);
super.onCreate(savedInstanceState);

//得到Intent对象当中的值
Intent intent = getIntent();
String result = intent.getStringExtra("result");
resultView = (TextView)findViewById(R.id.resultOf);
resultView.setText(result);

}

Answer 1

我认为你是不是忘了在配置文件AndroidManifest.xml里面把要跳转到的那个activity加进去了啊

追问

加了啊。

追答

你的".ResultActivty"是不是写错了啊 好像少了一个i吧，是".ResultActivity"吧