我刚接触安卓,今天学列表视图编写了一个小程序代码如下:
package com.example.jiemian;
import android.R.string;
import android.os.Bundle;
import android.app.Activity;
import android.app.ListActivity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
public class MainActivity extends ListActivity {
EditText et_xm,et_xh,et_csrq;
Button bt_zc,bt_cz;
RadioGroup rg_xb;
ListView lv_xianshi;
RadioButton rb;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
et_xm=(EditText) findViewById(R.id.et_xm);
et_xh=(EditText) findViewById(R.id.et_xh);
et_csrq=(EditText) findViewById(R.id.et_csrq);
bt_zc=(Button) findViewById(R.id.bt_zc);
bt_cz=(Button) findViewById(R.id.bt_cz);
rg_xb=(RadioGroup) findViewById(R.id.rg_xb);
rg_xb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
// TODO Auto-generated method stub
rb=(RadioButton) findViewById(checkedId);
rb.getText();
}
});
bt_zc.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String xh=et_xh.getText().toString();
String xm=et_xm.getText().toString();
String xb=rb.getText().toString();
String csrq=et_csrq.getText().toString();
String type[]=new String[]{xh,xm,xb,csrq};
ArrayAdapter<String> adapter =new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_spinner_item,type);
setListAdapter(adapter);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
结果在模拟器中无法运行,具体错误如下:
03-27 14:26:43.649: E/AndroidRuntime(1335): FATAL EXCEPTION: main
03-27 14:26:43.649: E/AndroidRuntime(1335): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.jiemian/com.example.jiemian.MainActivity}: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
03-27 14:26:43.649: E/AndroidRuntime(1335): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
03-27 14:26:43.649: E/AndroidRuntime(1335): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
03-27 14:26:43.649: E/AndroidRuntime(1335): at android.app.ActivityThread.access$600(ActivityThread.java:141)
03-27 14:26:43.649: E/AndroidRuntime(1335): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
03-27 14:26:43.649: E/AndroidRuntime(1335): at android.os.Handler.dispatchMessage(Handler.java:99)
03-27 14:26:43.649: E/AndroidRuntime(1335): at android.os.Looper.loop(Looper.java:137)
03-27 14:26:43.649: E/AndroidRuntime(1335): at android.app.ActivityThread.main(ActivityThread.java:5041)
03-27 14:26:43.649: E/AndroidRuntime(1335): at java.lang.reflect.Method.invokeNative(Native Method)
03-27 14:26:43.649: E/AndroidRuntime(1335): at java.lang.reflect.Method.invoke(Method.java:511)
03-27 14:26:43.649: E/AndroidRuntime(1335): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-27 14:26:43.649: E/AndroidRuntime(1335): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-27 14:26:43.649: E/AndroidRuntime(1335): at dalvik.system.NativeStart.main(Native Method)
03-27 14:26:43.649: E/AndroidRuntime(1335): Caused by: java.lang.RuntimeException: Your content must have a ListView whose id attribute is 'android.R.id.list'
03-27 14:26:43.649: E/AndroidRuntime(1335): at android.app.ListActivity.onContentChanged(ListActivity.java:243)
03-27 14:26:43.649: E/AndroidRuntime(1335): at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:273)
03-27 14:26:43.649: E/AndroidRuntime(1335): at android.app.Activity.setContentView(Activity.java:1881)
03-27 14:26:43.649: E/AndroidRuntime(1335): at com.example.jiemian.MainActivity.onCreate(MainActivity.java:29)
03-27 14:26:43.649: E/AndroidRuntime(1335): at android.app.Activity.performCreate(Activity.java:5104)
03-27 14:26:43.649: E/AndroidRuntime(1335): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
03-27 14:26:43.649: E/AndroidRuntime(1335): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
03-27 14:26:43.649: E/AndroidRuntime(1335): ... 11 more
求大神指点一下这个问题???