我是android开发新手。我的老师已经为我们设定了一个任务,开发一个应用程序并在其中输入文本。然后在按钮上点击发送这个数据到另一个应用程序,并显示在该应用程序上。 但是,当我点击按钮应用程序停止。 这是到目前为止我的代码从android的另一个应用程序启动一个应用程序的活动
布局XML
<EditText
android:id="@+id/editText1"
android:layout_width="140dp"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/button1"
android:layout_alignBottom="@+id/button1"
android:layout_alignParentLeft="false"
android:ems="10"
android:inputType="textPersonName" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="100dp"
android:layout_marginLeft="180dp"
android:text="Button 1"
android:onClick="function1" />
功能1在mainActivity.java
EditText myEditText;
public void function1(View v){
String userText=myEditText.getText().toString();
Intent i= new Intent();
i.setAction("textViewActivity");
i.putExtra("message", userText);
startActivity(i);
}
在我所注册的活动如下第二个应用程序:
<activity
android:name="Activity2"
android:label="@string/a2" >
<intent-filter>
<action android:name="textViewActivity" />
</intent-filter>
</activity>
activity2.java中的
:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout2);
TextView mytextView=(TextView) findViewById(R.id.text2View1);
String Value=getIntent().getExtras().getString("message");
mytextView.setText(Value);
}
我不知道我在哪里做错了。当我点击按钮程序停止。任何帮助,将不胜感激。
UPDATE: logcat的:
02-11 22:43:52.449: D/gralloc_goldfish(1092): Emulator without GPU emulation detected.
02-11 22:43:56.759: D/AndroidRuntime(1092): Shutting down VM
02-11 22:43:56.759: W/dalvikvm(1092): threadid=1: thread exiting with uncaught exception (group=0xb3ab0b90)
02-11 22:43:56.829: E/AndroidRuntime(1092): FATAL EXCEPTION: main
02-11 22:43:56.829: E/AndroidRuntime(1092): Process: smd.homework1.question2, PID: 1092
02-11 22:43:56.829: E/AndroidRuntime(1092): java.lang.IllegalStateException: Could not execute method of the activity
02-11 22:43:56.829: E/AndroidRuntime(1092): at android.view.View$1.onClick(View.java:3814)
02-11 22:43:56.829: E/AndroidRuntime(1092): at android.view.View.performClick(View.java:4424)
02-11 22:43:56.829: E/AndroidRuntime(1092): at android.view.View$PerformClick.run(View.java:18383)
02-11 22:43:56.829: E/AndroidRuntime(1092): at android.os.Handler.handleCallback(Handler.java:733)
02-11 22:43:56.829: E/AndroidRuntime(1092): at android.os.Handler.dispatchMessage(Handler.java:95)
02-11 22:43:56.829: E/AndroidRuntime(1092): at android.os.Looper.loop(Looper.java:137)
02-11 22:43:56.829: E/AndroidRuntime(1092): at android.app.ActivityThread.main(ActivityThread.java:4998)
02-11 22:43:56.829: E/AndroidRuntime(1092): at java.lang.reflect.Method.invokeNative(Native Method)
02-11 22:43:56.829: E/AndroidRuntime(1092): at java.lang.reflect.Method.invoke(Method.java:515)
02-11 22:43:56.829: E/AndroidRuntime(1092): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
02-11 22:43:56.829: E/AndroidRuntime(1092): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
02-11 22:43:56.829: E/AndroidRuntime(1092): at dalvik.system.NativeStart.main(Native Method)
02-11 22:43:56.829: E/AndroidRuntime(1092): Caused by: java.lang.reflect.InvocationTargetException
02-11 22:43:56.829: E/AndroidRuntime(1092): at java.lang.reflect.Method.invokeNative(Native Method)
02-11 22:43:56.829: E/AndroidRuntime(1092): at java.lang.reflect.Method.invoke(Method.java:515)
02-11 22:43:56.829: E/AndroidRuntime(1092): at android.view.View$1.onClick(View.java:3809)
02-11 22:43:56.829: E/AndroidRuntime(1092): ... 11 more
02-11 22:43:56.829: E/AndroidRuntime(1092): Caused by: java.lang.NullPointerException
02-11 22:43:56.829: E/AndroidRuntime(1092): at smd.homework1.question2.MainActivity.function1(MainActivity.java:26)
02-11 22:43:56.829: E/AndroidRuntime(1092): ... 14 more
你在logcat中得到什么?分享一下。 –
没有看到日志,真的很难知道这里有什么问题 – Sam
@amitsingh我已经更新了catlog。抱歉耽搁了。 – SSMA