我正在尝试将一些数据从一个活动移动到另一个活动。使用类应用程序
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;
}
}
============================== 第二个活动代码
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());
}
}
=============================== 应用程序类
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();
}
}
==============================
日志猫
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
我需要将主要活动上的 DditTexts 中的数据传递到 Second_activity 中的 TextView
提前致谢
问候