在AM中注册了一个叫first的Activity,但错误显示没有叫first的Activity

Question

想从名为first的activity跳到名为second的activity，再跳回去，但是错误显示
android.content.ActivityNotFoundException: No Activity found to handle
Intent { act=first }
以下为主要代码：

AM中的代码：
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
android:name=".MainActivity"
android:label="@string/app_name"
android:launchMode="singleTask">






android:name=".SecondActivity" >

    名为first的activity代码:
    public class MainActivity extends Activity {
 EditText etacc=null;
 Button btn=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    etacc=(EditText) findViewById(R.id.etacc);
    btn=(Button) findViewById(R.id.btn);
    btn.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            //String str=etacc.getText()+"";

            Intent intent=new Intent();
            //intent.putExtra("str", str);
            intent.setAction("second");
            startActivity(intent);

        }
    });
}


    名为second的activity的代码：
    public class SecondActivity extends Activity {
Button btnback=null;

@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.secondactivity);
btnback=(Button) findViewById(R.id.btnback);
btnback.setOnClickListener(new View.OnClickListener() {

        @SuppressLint("ShowToast") @Override
        public void onClick(View v) {

            Intent intent=new Intent("first");

            startActivity(intent);
        }
    });
}

}

Answer 1

把你onClick里的代码依次换成：

Intent intent = new Intent(context, SecondActivity.class);
startActivity(intent);

Intent intent = new Intent(context, MainActivity.class);
startActivity(intent);

就行了