//mainActivity.java
package com.example.framelayout;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class MainActivity extends ActionBarActivity {
boolean selected = true;
ImageView iv1 = (ImageView)findViewById(R.id.img1);
ImageView iv2 = (ImageView)findViewById(R.id.img2);
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button1 = (Button)findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener(){
public void onClick(View v){
changed();
}
});
}
private void changed(){
if(selected){
iv1.setVisibility(View.INVISIBLE);
iv2.setVisibility(View.VISIBLE);
}else{
iv1.setVisibility(View.VISIBLE);
iv2.setVisibility(View.INVISIBLE);
}
selected=!selected;
}
@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);
}
}
logcat
01-23 07:42:54.508: D/szipinf(5856): Initializing inflate state
01-23 07:42:54.518: D/AndroidRuntime(5856): Shutting down VM
01-23 07:42:54.518: W/dalvikvm(5856): threadid=1: thread exiting with uncaught exception (group=0x40015560)
01-23 07:42:54.528: E/AndroidRuntime(5856): FATAL EXCEPTION: main
01-23 07:42:54.528: E/AndroidRuntime(5856): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.framelayout/com.example.framelayout.MainActivity}: java.lang.NullPointerException
01-23 07:42:54.528: E/AndroidRuntime(5856): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1680)
01-23 07:42:54.528: E/AndroidRuntime(5856): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1784)
01-23 07:42:54.528: E/AndroidRuntime(5856): at android.app.ActivityThread.access$1500(ActivityThread.java:123)
01-23 07:42:54.528: E/AndroidRuntime(5856): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:939)
01-23 07:42:54.528: E/AndroidRuntime(5856): at android.os.Handler.dispatchMessage(Handler.java:99)
01-23 07:42:54.528: E/AndroidRuntime(5856): at android.os.Looper.loop(Looper.java:130)
01-23 07:42:54.528: E/AndroidRuntime(5856): at android.app.ActivityThread.main(ActivityThread.java:3835)
01-23 07:42:54.528: E/AndroidRuntime(5856): at java.lang.reflect.Method.invokeNative(Native Method)
01-23 07:42:54.528: E/AndroidRuntime(5856): at java.lang.reflect.Method.invoke(Method.java:507)
01-23 07:42:54.528: E/AndroidRuntime(5856): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:864)
01-23 07:42:54.528: E/AndroidRuntime(5856): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:622)
01-23 07:42:54.528: E/AndroidRuntime(5856): at dalvik.system.NativeStart.main(Native Method)
01-23 07:42:54.528: E/AndroidRuntime(5856): Caused by: java.lang.NullPointerException
01-23 07:42:54.528: E/AndroidRuntime(5856): at android.app.Activity.findViewById(Activity.java:1647)
01-23 07:42:54.528: E/AndroidRuntime(5856): at com.example.framelayout.MainActivity.<init>(MainActivity.java:14)
01-23 07:42:54.528: E/AndroidRuntime(5856): at java.lang.Class.newInstanceImpl(Native Method)
01-23 07:42:54.528: E/AndroidRuntime(5856): at java.lang.Class.newInstance(Class.java:1409)
01-23 07:42:54.528: E/AndroidRuntime(5856): at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
01-23 07:42:54.528: E/AndroidRuntime(5856): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1672)
01-23 07:42:54.528: E/AndroidRuntime(5856): ... 11 more
오류도 안뜨고 이상 없는거 같은데 계속 프로세스 종료가 뜨면서 어플이 종료되네요 ㅠㅠ
로그켓은 뭔말인지 모르겠네요 ㅠㅠ
