AndroidManifest.xml中配置了 跳转依然出错

slmax1 2011-05-09 10:51:41
activity01

package com.Activity01;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Activity01 extends Activity {
/** Called when the activity is first created. */
private EditText ParamOne;
private TextView textView;
private EditText ParamTwo;
private Button btn;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
/*初始化控件*/
ParamOne = (EditText)findViewById(R.id.editText1);
textView = (TextView)findViewById(R.id.textView1);
ParamTwo = (EditText)findViewById(R.id.editText2);
btn = (Button)findViewById(R.id.button1);
textView.setText(R.string.run);
/*绑定监听器至按钮*/
btn.setOnClickListener(new resultlistener());
}

/*创建监听器监听按钮动作*/
class resultlistener implements OnClickListener{

@Override
public void onClick(View v) {
/*得到控件的值并转换为字符串*/
String One = ParamOne.getText().toString();
String Two = ParamTwo.getText().toString();
/*构建intent对象,并传值*/
Intent intent = new Intent();
intent.putExtra("argOne", One);
intent.putExtra("argTwo", Two);
intent.setClass(Activity01.this, Activity02.class);
Activity01.this.startActivity(intent);
}

}
}



activity02

package com.Activity01;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class Activity02 extends Activity{
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.result);
/*构建intent,并接受值*/
Intent intent = new Intent();
String StrOne = intent.getStringExtra("argOne");
String StrTwo = intent.getStringExtra("argTwo");
/*转换数据类型,并计算*/
int intOne = Integer.parseInt(StrOne);
int intTwo = Integer.parseInt(StrTwo);
int result =intOne * intTwo;
/*显示数据*/
TextView tv = (TextView)findViewById(R.id.T);
tv.setText(result + "");
}


}


main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<EditText android:id="@+id/editText1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
</EditText>

<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/textView1" android:text="@string/initstring">
</TextView>
<EditText android:id="@+id/editText2" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/initstring"></EditText>
<Button android:layout_width="fill_parent" android:id="@+id/button1" android:layout_height="wrap_content" android:text="@string/result1"></Button>
</LinearLayout>


result.xml

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



mainfest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.Activity01"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="4" />

<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Activity01"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Activity02">

</activity>
</application>
</manifest>


string.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="hello">Hello World, Activity01!</string>
<string name="app_name">Activity01</string>
<string name="result">result</string>
<string name="run">乘以</string>
<string name="initstring"></string>
<string name="result1">计算</string>
</resources>


运行时程序意外终止,.为什么
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lizhengjun2010 2011-05-09
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activity2中出错啦

/*构建intent,并接受值*/
Intent intent =getIntent(); String StrOne = intent.getStringExtra("argOne");
String StrTwo = intent.getStringExtra("argTwo");
/*转换数据类型,并计算*/
int intOne = Integer.parseInt(StrOne);
int intTwo = Integer.parseInt(StrTwo);
int result =intOne * intTwo;
左师傅冰红茶 2011-05-09
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不是xml的问题,Activity02中,获取参数的方法不对,应该用this.getIntent()先获取到intent,然后intent.getStringExtra("argName")来获取参数值,楼主注意多设断点调试。
sky123123 2011-05-09
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Intent intent = getIntent();
if(intent != null) {
//.....
.
.
.
}
I_am_studying 2011-05-09
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activity2中Intent intent = new Intent();这句代码获取的是空的Intent,所以会出错。。。
楼上们正解

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