新手请问:代码哪里出错了

新手请教:代码哪里出错了?错误信息:05-18 16:08:41.695: ERROR/AndroidRuntime(1320): FATAL EXCEPTION: m

新手请教:代码哪里出错了?
错误信息:
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): FATAL EXCEPTION: main
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): android.content.ActivityNotFoundException: No Activity found to handle Intent { act=android.intent.action.CALL dat=tel5556 }
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1408)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at android.app.Instrumentation.execStartActivity(Instrumentation.java:1378)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at android.app.Activity.startActivityForResult(Activity.java:2817)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at android.app.Activity.startActivity(Activity.java:2923)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at cn.itcast.phone.MainActivity$ButtonClickListener.onClick(MainActivity.java:30)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at android.view.View.performClick(View.java:2408)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at android.view.View$PerformClick.run(View.java:8816)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at android.os.Handler.handleCallback(Handler.java:587)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at android.os.Handler.dispatchMessage(Handler.java:92)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at android.os.Looper.loop(Looper.java:123)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at android.app.ActivityThread.main(ActivityThread.java:4627)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at java.lang.reflect.Method.invokeNative(Native Method)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at java.lang.reflect.Method.invoke(Method.java:521)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
05-18 16:08:41.695: ERROR/AndroidRuntime(1320): at dalvik.system.NativeStart.main(Native Method)

src:
package cn.xx.phone;
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import cn.xx.app.R;
public class MainActivity extends Activity {
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.main);
  Button button = (Button) this.findViewById(R.id.button);
  button.setOnClickListener(new ButtonClickListener());
  }
  private final class ButtonClickListener implements View.OnClickListener {

public void onClick(View v) {
EditText mobileText = (EditText) findViewById(R.id.mobile);
String number = mobileText.getText().toString();
Intent intent = new Intent();
intent.setAction("android.intent.action.CALL");
//intent.addCategory("android.intent.category.DEFAULT");
intent.setData(Uri.parse("tel"+number));
startActivity(intent);//方法内部会自动为Intent添加类别:android.intent.category.DEFAULT
}
  }
}

R文件:
/* AUTO-GENERATED FILE. DO NOT MODIFY.
 *
 * This class was automatically generated by the
 * aapt tool from the resource data it found. It
 * should not be modified by hand.
 */

package cn.xx.app;
public final class R {
  public static final class attr {
  }
  public static final class drawable {
  public static final int ic_launcher=0x7f020000;
  }
  public static final class id {


  public static final int button=0x7f050001;
  public static final int mobile=0x7f050000;
  }
  public static final class layout {
  public static final int main=0x7f030000;
  }
  public static final class string {
  public static final int app_name=0x7f040001;
  public static final int button=0x7f040003;
  public static final int hello=0x7f040000;
  public static final int mobile=0x7f040002;
  }
}

main文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical" >
  <TextView
  android:layout_width="fill_parent"
  android:layout_height="wrap_content"
  android:text="@string/mobile" />
  <EditText 
  android:layout_width="fill_parent"
  android:layout_height="wrap_content" 
  android:id="@+id/mobile" />
  <Button 
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:text="@string/button"
  android:id="@+id/button" />
</LinearLayout>

string文件:
<?xml version="1.0" encoding="utf-8"?>
<resources>
  <string name="hello">Hello World, MainActivity!</string>
  <string name="app_name">电话拨号器</string>
  <string name="mobile">请输入手机号</string>
  <string name="button">拨号</string>
</resources>

AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="cn.xx.app"
  android:versionCode="1"
  android:versionName="1.0" >
  <uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.CALL_PHONE" />
  <application
  android:icon="@drawable/ic_launcher"
  android:label="@string/app_name" >
  <activity
  android:label="@string/app_name"
  android:name="cn.itcast.phone.MainActivity" >
  <intent-filter >
  <action android:name="android.intent.action.MAIN" />
  <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>
  </activity>
  </application>
</manifest>

project.properties:
# This file is automatically generated by Android Tools.
# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
#
# This file must be checked in Version Control Systems.
#
# To customize properties used by the Ant build system use,
# "ant.properties", and override values to adapt the script to your
# project structure.
# Project target.
target=android-8


[解决办法]
加上
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);