作为练习,我在https://developer.android.com/training/basics/firstapp/index.html上创建示例“构建您的第一个应用程序”
现在我有意图的问题。 Eclipse说“ Unreachable Code”,我已经导入了Intent类(import android.content.Intent;)
Intent intent = getIntent();
这是代码:
package com.example.test;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v4.app.NavUtils;
import android.annotation.TargetApi;
import android.os.Build;
import android.content.Intent;
import android.widget.TextView;
public class DisplayMessageActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display_message);
// Show the Up button in the action bar.
setupActionBar();
}
/**
* Set up the {@link android.app.ActionBar}, if the API is available.
*/
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void setupActionBar() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
getActionBar().setDisplayHomeAsUpEnabled(true);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.display_message, menu);
return true;
// 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);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// This ID represents the Home or Up button. In the case of this
// activity, the Up button is shown. Use NavUtils to allow users
// to navigate up one level in the application structure. For
// more details, see the Navigation pattern on Android Design:
//
// http://developer.android.com/design/patterns/navigation.html#up-vs-back
//
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}
}
最佳答案
无法达到,因为您在前面的行中return
。
return true;
// Get the message from the intent
**Intent intent = getIntent();**
删除return语句(使它成为您在该方法中所做的最后一件事)或使其成为有条件的。
关于java - Eclipse中的Android开发无法达到代码 Intent ,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/21254250/