我正在尝试将一些数据从一项活动转移到另一项活动。
使用课堂申请
项目活动：
主要活动。
Second_Activity。
主要活动代码
public class MainActivity extends Activity
{
private ApplicationSettings application;
private Button btn;
private EditText txt1;
private EditText txt2;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txt1 = (EditText)findViewById(R.id.txt1);
txt2 = (EditText)findViewById(R.id.txt2);
btn = (Button)findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View arg0)
{
application = (ApplicationSettings)getApplication();
application.setUserID(txt1.getText().toString());
application.setUserName(txt2.getText().toString());
Intent intent = new Intent(MainActivity.this,SecondActivity.class);
startActivity(intent);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}
============================
第二活动代码
public class SecondActivity extends Activity
{
private ApplicationSettings application;
private TextView txt1,txt2;
@Override
protected void onCreate(Bundle savedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
application = (ApplicationSettings)getApplication();
txt1 = (TextView)findViewById(R.id.txt1);
txt2 = (TextView)findViewById(R.id.txt2);
txt1.setText(application.getUserID().toString());
txt2.setText(application.getUserName().toString());
}
}
=============================
应用类别
public class ApplicationSettings extends Application
{
String UserID;
String UserName;
public String getUserID()
{
return UserID;
}
public void setUserID(String userID)
{
UserID = userID;
}
public String getUserName()
{
return UserName;
}
public void setUserName(String userName)
{
UserName = userName;
}
@Override
public void onCreate() {
super.onCreate();
}
}
============================
LogCat
11-25 15:32:31.695: E/Trace(17282): error opening trace file: No such file or directory (2)
11-25 15:32:31.960: D/libEGL(17282): loaded /system/lib/egl/libEGL_mali.so
11-25 15:32:31.965: D/libEGL(17282): loaded /system/lib/egl/libGLESv1_CM_mali.so
11-25 15:32:31.965: D/libEGL(17282): loaded /system/lib/egl/libGLESv2_mali.so
11-25 15:32:31.975: D/(17282): Device driver API match
11-25 15:32:31.975: D/(17282): Device driver API version: 10
11-25 15:32:31.975: D/(17282): User space API version: 10
11-25 15:32:31.975: D/(17282): mali: REVISION=Linux-r2p4-02rel0 BUILD_DATE=Wed Sep 12 17:53:53 KST 2012
11-25 15:32:32.000: D/OpenGLRenderer(17282): Enabling debug mode 0
11-25 15:32:32.005: E/SensorManager(17282): thread start
11-25 15:32:32.010: D/SensorManager(17282): registerListener :: handle = 0 name= LSM330DLC Acceleration Sensor delay= 200000 Listener= android.view.OrientationEventListener$SensorEventListenerImpl@41f68078
11-25 15:32:32.075: W/IInputConnectionWrapper(17282): showStatusIcon on inactive InputConnection
11-25 15:32:37.290: D/GestureDetector(17282): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 2 mFalseSizeCnt:0
11-25 15:32:37.295: D/SensorManager(17282): unregisterListener:: Listener= android.view.OrientationEventListener$SensorEventListenerImpl@41f68078
11-25 15:32:37.295: D/Sensors(17282): Remain listener = Sending .. normal delay 200ms
11-25 15:32:37.295: I/Sensors(17282): sendDelay --- 200000000
11-25 15:32:37.295: D/SensorManager(17282): JNI - sendDelay
11-25 15:32:37.295: I/SensorManager(17282): Set normal delay = true
11-25 15:32:37.300: D/SensorManager(17282): registerListener :: handle = 0 name= LSM330DLC Acceleration Sensor delay= 200000 Listener= android.view.OrientationEventListener$SensorEventListenerImpl@41f69650
11-25 15:32:37.315: W/IInputConnectionWrapper(17282): getSelectedText on inactive InputConnection
11-25 15:32:37.315: W/IInputConnectionWrapper(17282): setComposingText on inactive InputConnection
11-25 15:32:37.315: W/IInputConnectionWrapper(17282): getExtractedText on inactive InputConnection
11-25 15:32:41.350: D/SensorManager(17282): unregisterListener:: Listener= android.view.OrientationEventListener$SensorEventListenerImpl@41f69650
11-25 15:32:41.350: D/Sensors(17282): Remain listener = Sending .. normal delay 200ms
11-25 15:32:41.350: I/Sensors(17282): sendDelay --- 200000000
11-25 15:32:41.350: D/SensorManager(17282): JNI - sendDelay
11-25 15:32:41.350: I/SensorManager(17282): Set normal delay = true
11-25 15:32:41.620: W/IInputConnectionWrapper(17282): showStatusIcon on inactive InputConnection
11-25 15:32:46.200: D/SensorManager(17282): registerListener :: handle = 0 name= LSM330DLC Acceleration Sensor delay= 200000 Listener= android.view.OrientationEventListener$SensorEventListenerImpl@41f8b4c8
11-25 15:32:47.170: D/GestureDetector(17282): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 2 mFalseSizeCnt:0
11-25 15:32:47.175: D/SensorManager(17282): unregisterListener:: Listener= android.view.OrientationEventListener$SensorEventListenerImpl@41f8b4c8
11-25 15:32:47.175: D/Sensors(17282): Remain listener = Sending .. normal delay 200ms
11-25 15:32:47.175: I/Sensors(17282): sendDelay --- 200000000
11-25 15:32:47.175: D/SensorManager(17282): JNI - sendDelay
11-25 15:32:47.175: I/SensorManager(17282): Set normal delay = true
11-25 15:32:47.180: D/SensorManager(17282): registerListener :: handle = 0 name= LSM330DLC Acceleration Sensor delay= 200000 Listener= android.view.OrientationEventListener$SensorEventListenerImpl@41f8c6b8
11-25 15:32:47.210: W/IInputConnectionWrapper(17282): getSelectedText on inactive InputConnection
11-25 15:32:47.210: W/IInputConnectionWrapper(17282): setComposingText on inactive InputConnection
11-25 15:32:47.210: W/IInputConnectionWrapper(17282): getExtractedText on inactive InputConnection
11-25 15:32:50.470: D/GestureDetector(17282): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 2 mFalseSizeCnt:0
11-25 15:32:50.475: D/SensorManager(17282): unregisterListener:: Listener= android.view.OrientationEventListener$SensorEventListenerImpl@41f8c6b8
11-25 15:32:50.475: D/Sensors(17282): Remain listener = Sending .. normal delay 200ms
11-25 15:32:50.475: I/Sensors(17282): sendDelay --- 200000000
11-25 15:32:50.475: D/SensorManager(17282): JNI - sendDelay
11-25 15:32:50.475: I/SensorManager(17282): Set normal delay = true
11-25 15:32:50.480: D/SensorManager(17282): registerListener :: handle = 0 name= LSM330DLC Acceleration Sensor delay= 200000 Listener= android.view.OrientationEventListener$SensorEventListenerImpl@41f8b4c8
11-25 15:32:50.490: W/IInputConnectionWrapper(17282): getSelectedText on inactive InputConnection
11-25 15:32:50.490: W/IInputConnectionWrapper(17282): setComposingText on inactive InputConnection
11-25 15:32:50.490: W/IInputConnectionWrapper(17282): getExtractedText on inactive InputConnection
11-25 15:32:53.000: D/GestureDetector(17282): [Surface Touch Event] mSweepDown False, mLRSDCnt : -1 mTouchCnt : 3 mFalseSizeCnt:0
11-25 15:32:53.160: D/AndroidRuntime(17282): Shutting down VM
11-25 15:32:53.160: W/dalvikvm(17282): threadid=1: thread exiting with uncaught exception (group=0x412862a0)
11-25 15:32:53.175: E/AndroidRuntime(17282): FATAL EXCEPTION: main
11-25 15:32:53.175: E/AndroidRuntime(17282): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.test01/com.example.test01.SecondActivity}: java.lang.NullPointerException
11-25 15:32:53.175: E/AndroidRuntime(17282): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2100)
11-25 15:32:53.175: E/AndroidRuntime(17282): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2125)
11-25 15:32:53.175: E/AndroidRuntime(17282): at android.app.ActivityThread.access$600(ActivityThread.java:140)
11-25 15:32:53.175: E/AndroidRuntime(17282): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1227)
11-25 15:32:53.175: E/AndroidRuntime(17282): at android.os.Handler.dispatchMessage(Handler.java:99)
11-25 15:32:53.175: E/AndroidRuntime(17282): at android.os.Looper.loop(Looper.java:137)
11-25 15:32:53.175: E/AndroidRuntime(17282): at android.app.ActivityThread.main(ActivityThread.java:4898)
11-25 15:32:53.175: E/AndroidRuntime(17282): at java.lang.reflect.Method.invokeNative(Native Method)
11-25 15:32:53.175: E/AndroidRuntime(17282): at java.lang.reflect.Method.invoke(Method.java:511)
11-25 15:32:53.175: E/AndroidRuntime(17282): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1008)
11-25 15:32:53.175: E/AndroidRuntime(17282): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:775)
11-25 15:32:53.175: E/AndroidRuntime(17282): at dalvik.system.NativeStart.main(Native Method)
11-25 15:32:53.175: E/AndroidRuntime(17282): Caused by: java.lang.NullPointerException
11-25 15:32:53.175: E/AndroidRuntime(17282): at com.example.test01.SecondActivity.onCreate(SecondActivity.java:26)
11-25 15:32:53.175: E/AndroidRuntime(17282): at android.app.Activity.performCreate(Activity.java:5191)
11-25 15:32:53.175: E/AndroidRuntime(17282): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
11-25 15:32:53.175: E/AndroidRuntime(17282): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2064)
11-25 15:32:53.175: E/AndroidRuntime(17282): ... 11 more
11-25 15:32:53.195: D/dalvikvm(17282): GC_CONCURRENT freed 180K, 9% free 12405K/13575K, paused 12ms+2ms, total 31ms
我需要将数据从主活动上的DditTexts传递到Second_activity中的TextView
提前致谢
问候
最佳答案
作为您的日志为：
您是否在AndroidManifest.xml中声明了此活动？
表示确保已将AndroidManifest中的SecondActivity.class活动声明为：
<Activity android:name=".SecondActivity" />
如果已声明，则请确保它与您在
SecondActivity.java中创建的软件包位于同一软件包中或具有相同的名称如果您在不同的Package中有
SecondActivity，请在AndroidManifest中将其声明为：<Activity android:name="<FULL_PACKAGE_NAME>.SecondActivity" />