나는 안드로이드 개발을 처음 접했고 작은 응용 프로그램을 만들기 위해 this tutorial을 팔로우하고 있습니다. 방금 약간의 코드를 변경했습니다. 보내기 버튼을 클릭하면 "불행히도이 첫 번째 앱이 중지되었습니다."라는 메시지가 나타납니다. 문제가 무엇이든간에 누군가 나에게 말해 줄 수 있습니까? 내 간단한 응용 프로그램이 멈춘 이유
는 I (여기서는 두 번째 클래스의 코드 블록 주석으로 도시 됨) 가이드에 주어진 코드를 대체하고, 여기에서 코드로 대체 코멘트 * 을 함유 띄는했다.FIRST 활동 : - FIRST 활동의
package com.practice.firstapp1;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import com.practice.firstapp1.R;
public class MainActivity extends Activity {
public final static String EXTRA_MESSAGE= "com.practice.fristapp1.MESSAGE";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@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;
}
/** Called when the user clicks the Send button */
/** 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.id1);
String message = editText.getText().toString();
intent.putExtra(EXTRA_MESSAGE, message);
startActivity(intent);
}
}
LAYOUT : - 2ND 활동의
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal">
<EditText android:id="@+id/id1"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:hint="@string/edit_message" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/button_send"
android:onClick="sendMessage" />
</LinearLayout>
CODE : - 2ND 활동의
package com.practice.firstapp1;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.view.MenuItem;
import android.widget.TextView;
public class DisplayMessageActivity extends Activity {
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_message);
// Make sure we're running on Honeycomb or higher to use ActionBar APIs
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
// Show the Up button in the action bar.
getActionBar().setDisplayHomeAsUpEnabled(true);
}
//Get the intent which invoked this activity and read its extra's data into the string named message.
Intent intent = getIntent();
String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);
TextView textView = (TextView) findViewById(R.id.text_view_2); //************
textView.setText(message);//***********
setContentView(textView);//***********
//The above three statements along with statements from its layout (which have been given *s in comments have been placed instead of the statements in the following block comment. Because I wanted to create the TextView in layout.xml and handle its work in code.
/*
// 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);
*/
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
}
LAYOUT : -
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".DisplayMessageActivity" >
<TextView <!--//*********************************-->
android:id="@+id/text_view_2" <!--//***********************-->
android:layout_width="wrap_content" <!--//**********************-->
android:layout_height="wrap_content" <!--//**************-->
android:textSize="40sp" /> <!--//**************************-->
</RelativeLayout>
안드로이드 매니페스트 파일 : -
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.practice.firstapp1"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.practice.firstapp1.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.practice.firstapp1.DisplayMessageActivity"
android:label="@string/title_activity_display_message"
android:parentActivityName="com.practice.firstapp1.MainActivity" >
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value="com.practice.firstapp1.MainActivity" />
</activity>
</application>
</manifest>
에 대한 필요가 당신은 로그 캣에서 오류를하시기 바랍니다 게시 할 수 없었다? –
매니페스트 파일에서 활동을 선언하셨습니까? 게시물 매니페스트 파일 – Raghunandan
및이'setContentView (textView); 필요하지 않습니다 – Raghunandan