1.mainactivity想要跳到diaplay这个activity,在mainactivity里点击按钮,触发跳转,代码如下:
//按钮对应的点击事件
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.TS_button1:
//响应按钮的点击事件
Intent intent = new Intent();
intent.putExtra("dept", 1);
intent.setClass(Tel_aActivity.this, Tel_diaplayActivity.class);
startActivity(intent);
break;
...
2.diaplay这个activity的oncreate()方法如下:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tel_display);
}
3.在清单文件注册diaplay代码如下:
<activity
android:name="com.example.telsearch.Tel_diaplayActivity"
android:label="@string/app_name"
>
</activity>
4.部署,运行,抛出异常
11-23 11:10:17.284: E/AndroidRuntime(781): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.telsearch/com.example.telsearch.Tel_diaplayActivity}: java.lang.NullPointerException
5.另外在每次保存文件的时候出现下列异常:
求解