小编And*_*rez的帖子

我有一个简单的应用程序(基于Android First App示例); 它唯一能做的就是显示一个EditText和一个按钮.该按钮创建另一个活动,并显示EditText消息......简单!...但是当在模拟器上运行时,当我点击按钮时应用程序关闭,我收到此错误:

"对于片段PlaceholderFragment {4173ead8#0 id = 0x7f05003c},找不到id 0x7f05003c(com.example.testapp:id/container)的视图"

MainActivity.java

public class MainActivity extends ActionBarActivity {

public final static String EXTRA_MESSAGE = "com.example.testapp.MESSAGE";

public void SendMessage (View view) {
    Intent intent = new Intent(this, DisplayMessageActivity.class);
    EditText editText = (EditText) findViewById(R.id.edt_message);
    String message = editText.getText().toString();
    intent.putExtra(EXTRA_MESSAGE, message);
    startActivity(intent);
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    if (savedInstanceState == null) {
        getSupportFragmentManager().beginTransaction()
                .add(R.id.container, new PlaceholderFragment())
                .commit();
    }
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the …