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我从没有编程经验到学习Android。我正在使用带有ADT插件的Eclipse在Google上进行在线教程。为什么提交文本时应用程序强制关闭？
初学者部分的最后一个教程是让用户输入一个语句并开始一个显示该输入文本的新活动。当我在Nexus 10上运行应用程序时，每次按下提交按钮时强制关闭。
我猜这是在我的主要活动中发送文本或检索我的displaymessage活动中的文本时出现的问题。
我为我的菜鸟性质提前道歉。我会很感激任何帮助。
MainActivity.java：
package com.charteacher.gnuoral;
import android.content.Intent;
import android.app.Activity;
import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
public class MainActivity extends Activity {
public final static String EXTRA_MESSAGE = "com.example.gnuoral.MESSAGE";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
}
/**Called when the user clicks the Send button*/
public void sendMessage (View view){
Intent intent = new Intent (this, DisplayMessageActivity.class);
EditText editText = (EditText) findViewById(R.id.edit_message);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
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.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
}
*这是Displaymssageactivity
package com.charteacher.gnuoral;
import android.widget.TextView;
import android.app.Activity;
import android.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
public class DisplayMessageActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_message);
//get the message from the intent
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
//create the text view
TextView textView = new TextView(this);
textView.setTextSize(40);
textView.setText(message);
//Set the text view as the activity layout
setContentView(textView);
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_display_message,
container, false);
return rootView;
}
}
}
我做的logcat /不幸的是，这是所有希腊给我的时刻。这是我的结果。我只想得到一个功能程序。以后我会担心形式错误。
05-09 15:44:42.611: D/dalvikvm(14082): Late-enabling CheckJNI
05-09 15:44:43.006: D/mali_winsys(14082): new_window_surface returns 0x3000
05-09 15:44:43.076: D/OpenGLRenderer(14082): Enabling debug mode 0
05-09 15:44:43.201: I/ActivityManager(14082): Timeline: Activity_idle id: [email protected] time:3937368
05-09 15:44:43.256: E/SpannableStringBuilder(14082): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
05-09 15:44:43.256: E/SpannableStringBuilder(14082): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
05-09 15:44:43.266: E/SpannableStringBuilder(14082): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
05-09 15:44:43.266: E/SpannableStringBuilder(14082): SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
05-09 15:44:44.071: I/ActivityManager(14082): Timeline: Activity_idle id: [email protected] time:3938235
05-09 15:44:53.736: D/AndroidRuntime(14082): Shutting down VM
05-09 15:44:53.736: W/dalvikvm(14082): threadid=1: thread exiting with uncaught exception (group=0x41f8dc80)
05-09 15:44:53.736: E/AndroidRuntime(14082): FATAL EXCEPTION: main
05-09 15:44:53.736: E/AndroidRuntime(14082): Process: com.charteacher.gnuoral, PID: 14082
05-09 15:44:53.736: E/AndroidRuntime(14082): java.lang.IllegalStateException: Could not find a method sendmessage(View) in the activity class com.charteacher.gnuoral.MainActivity for onClick handler on view class android.widget.Button
05-09 15:44:53.736: E/AndroidRuntime(14082): at android.view.View$1.onClick(View.java:3817)
05-09 15:44:53.736: E/AndroidRuntime(14082): at android.view.View.performClick(View.java:4445)
05-09 15:44:53.736: E/AndroidRuntime(14082): at android.view.View$PerformClick.run(View.java:18429)
05-09 15:44:53.736: E/AndroidRuntime(14082): at android.os.Handler.handleCallback(Handler.java:733)
05-09 15:44:53.736: E/AndroidRuntime(14082): at android.os.Handler.dispatchMessage(Handler.java:95)
05-09 15:44:53.736: E/AndroidRuntime(14082): at android.os.Looper.loop(Looper.java:136)
05-09 15:44:53.736: E/AndroidRuntime(14082): at android.app.ActivityThread.main(ActivityThread.java:5081)
05-09 15:44:53.736: E/AndroidRuntime(14082): at java.lang.reflect.Method.invokeNative(Native Method)
05-09 15:44:53.736: E/AndroidRuntime(14082): at java.lang.reflect.Method.invoke(Method.java:515)
05-09 15:44:53.736: E/AndroidRuntime(14082): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:781)
05-09 15:44:53.736: E/AndroidRuntime(14082): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
05-09 15:44:53.736: E/AndroidRuntime(14082): at dalvik.system.NativeStart.main(Native Method)
05-09 15:44:53.736: E/AndroidRuntime(14082): Caused by: java.lang.NoSuchMethodException: sendmessage [class android.view.View]
05-09 15:44:53.736: E/AndroidRuntime(14082): at java.lang.Class.getConstructorOrMethod(Class.java:472)
05-09 15:44:53.736: E/AndroidRuntime(14082): at java.lang.Class.getMethod(Class.java:857)
05-09 15:44:53.736: E/AndroidRuntime(14082): at android.view.View$1.onClick(View.java:3810)
05-09 15:44:53.736: E/AndroidRuntime(14082): ... 11 more
05-09 15:44:55.871: I/Process(14082): Sending signal. PID: 14082 SIG: 9
logcat中显示的错误是什么？ – Raptor
你需要显示来自logcat的堆栈跟踪...你在哪里设置了按钮的onclick侦听器到'sendMessage'方法？ –
发布你的布局和堆栈跟踪 – Libin