我是Android编程的新手,我有一个具有imageButton的活动,当它被单击时,它将为具有对话框主题的结果打开一个新活动。用户输入一些数据并点击提交。然后我需要获取这些数据,以便更新第一个活动中的某些图像。问题是,当我尝试访问意图中的字符串时,我不断收到NullPointerException。当尝试在onActivityResult中获取数据意图时发生NullPointerException
1日活动的onclick方法:
public void openDetails(View view){
Intent intent = new Intent(this, FinalAnalysisDialog.class);
//add to backStack
startActivityForResult(intent, 1);
}
2日活动(对话的主题):
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.final_analysis_activity);
WindowManager.LayoutParams params = getWindow().getAttributes();
//params.x = -100;
params.height = 500;
params.width = 600;
//params.y = -50;
this.getWindow().setAttributes(params);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
//final??
final Spinner dropDown = (Spinner) findViewById(R.id.faResultsDropDown);
dropDown.setSelection(2);
Button submit = (Button) findViewById(R.id.faSubmitButton);
submit.setOnClickListener(new OnClickListener() {
//based on the value of selected item from dropDown (spinner), update the
//progress status picture
@Override
public void onClick(View v) {
Bundle bundle = new Bundle();
//dropDown.getSelectedItemPosition();
String result = dropDown.getSelectedItem().toString();
//String result = "In process";
bundle.putString("result", result);
Intent intent = new Intent();
//intent.putExtras(bundle);
intent.putExtra("result", result);
setResult(RESULT_OK, intent);
finish();
}
});
然后我试图让弦退了出来:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
super.onActivityResult(requestCode, resultCode, data);
if (resultCode==RESULT_OK && requestCode==1){
//ImageButton mFApic = (ImageButton)home.getView().findViewById(R.id.mInsStepImage);//andrology_home_fragment
ImageButton mFApic = (ImageButton)findViewById(R.id.mInsStepImage);//andrology_home_fragment
View mHomeFApic = (View)findViewById(R.id.maleFA);//male_details
//do something with result
//Intent dataResult = data.getData();
//Bundle bundle =dataResult.getExtras();
//String result = bundle.getString("result");
Bundle extras = data.getExtras();
String result = extras.getString("result");
//String result = data.getStringExtra();
if (result.equals("Not started")){
mFApic.setBackgroundResource(R.drawable.orange_process);
mHomeFApic.setBackgroundResource(R.drawable.orange_process);
}else if (result.equals("In process")){
mFApic.setBackgroundResource(R.drawable.orange_process);
mHomeFApic.setBackgroundResource(R.drawable.orange_process);
}else if (result.equals("Complete")){
mFApic.setBackgroundResource(R.drawable.green_process);
mHomeFApic.setBackgroundResource(R.drawable.green_process);
}else if (result.equals("Problem")){
mFApic.setBackgroundResource(R.drawable.red_process);
mHomeFApic.setBackgroundResource(R.drawable.red_process);
}
}
我已经试图发送一个静态字符串“正在处理”,以查看问题是否可以从微调器中获得价值,但这种方式无效。我搜索了类似的问题,但我似乎无法得到这个工作。我错过了什么?任何帮助将不胜感激..
这里是我的logcat:
05-09 14:26:31.133: E/AndroidRuntime(4984): FATAL EXCEPTION: main
05-09 14:26:31.133: E/AndroidRuntime(4984): java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=1, result=-1, data=Intent { (has extras) }} to activity {com.example.seattleivf/com.example.seattleivf.TabActionBarHomeActivity}: java.lang.NullPointerException
05-09 14:26:31.133: E/AndroidRuntime(4984): at android.app.ActivityThread.deliverResults(ActivityThread.java:3179)
05-09 14:26:31.133: E/AndroidRuntime(4984): at android.app.ActivityThread.handleSendResult(ActivityThread.java:3222)
05-09 14:26:31.133: E/AndroidRuntime(4984): at android.app.ActivityThread.access$1100(ActivityThread.java:140)
05-09 14:26:31.133: E/AndroidRuntime(4984): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1276)
05-09 14:26:31.133: E/AndroidRuntime(4984): at android.os.Handler.dispatchMessage(Handler.java:99)
05-09 14:26:31.133: E/AndroidRuntime(4984): at android.os.Looper.loop(Looper.java:137)
05-09 14:26:31.133: E/AndroidRuntime(4984): at android.app.ActivityThread.main(ActivityThread.java:4895)
05-09 14:26:31.133: E/AndroidRuntime(4984): at java.lang.reflect.Method.invokeNative(Native Method)
05-09 14:26:31.133: E/AndroidRuntime(4984): at java.lang.reflect.Method.invoke(Method.java:511)
05-09 14:26:31.133: E/AndroidRuntime(4984): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994)
05-09 14:26:31.133: E/AndroidRuntime(4984): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761)
05-09 14:26:31.133: E/AndroidRuntime(4984): at dalvik.system.NativeStart.main(Native Method)
05-09 14:26:31.133: E/AndroidRuntime(4984): Caused by: java.lang.NullPointerException
05-09 14:26:31.133: E/AndroidRuntime(4984): at com.example.seattleivf.TabActionBarHomeActivity.onActivityResult(TabActionBarHomeActivity.java:197)
05-09 14:26:31.133: E/AndroidRuntime(4984): at android.app.Activity.dispatchActivityResult(Activity.java:5347)
05-09 14:26:31.133: E/AndroidRuntime(4984): at android.app.ActivityThread.deliverResults(ActivityThread.java:3175)
05-09 14:26:31.133: E/AndroidRuntime(4984): ... 11 more
也许试试intent.putExtra(“return-data”,true);在你开始活动之前 – JRowan 2013-05-09 21:38:17
你试过我的解决方案吗? – Daniel 2013-05-09 21:47:32
哪一行是197你得到NullPointerException? stacktrace表明你正在返回的'Intent1'有额外的“,所以'data.getExtras()'不应该返回null。是否有可能您的某个'findViewById()'调用返回null,并且在使用该调用时您得到了NPE?你的代码对我来说看起来很好。您可以添加调试日志记录来查看问题出在哪里,也可以通过调试器逐步完成。 – 2013-05-09 23:00:39