希望我能在这里找到一些帮助,因为我已经寻找解决方案几周了。我正在使用 android studio 来编写应用程序。
当我按下按钮启动新的 Activity 时,它会打开一个空的 Activity ,而不是应该打开的 Activity 。
新的 Activity 已编码在 Manifest 中,并且没有任何错误通知。也许它没有理解 Intent ?
这里是主要 Activity :
public class MainActivity extends AppCompatActivity {
Toolbar toolbar;
ViewPager viewPager;
TabLayout tabLayout;
FloatingActionButton fabtn1;
FloatingActionButton fabtn2;
FloatingActionButton fabtn3;
FloatingActionButton fabtn4;
int counter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
viewPager = (ViewPager) findViewById(R.id.viewpager);
ViewPagerAdapter1 viewPagerAdapter1 = new ViewPagerAdapter1(getSupportFragmentManager());
viewPager.setAdapter(viewPagerAdapter1);
tabLayout = (TabLayout) findViewById(R.id.tablayout);
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
fabtn1 = (FloatingActionButton) findViewById(R.id.fab1);
fabtn1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
counter++;
if ((counter % 2) == 1) {
fabtn2.animate().translationY(-200).setDuration(300).alpha(1);
fabtn3.animate().translationY(-400).setDuration(320).alpha(1);
fabtn4.animate().translationY(-600).setDuration(340).alpha(1);
}
if ((counter % 2) == 0) {
fabtn2.animate().translationY(0).setDuration(300).alpha(0);
fabtn3.animate().translationY(0).setDuration(320).alpha(0);
fabtn4.animate().translationY(0).setDuration(340).alpha(0);
}
}
});
//That's the Button, which should open the new Activity:
fabtn2 = (FloatingActionButton) findViewById(R.id.fab2);
fabtn2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent Startmessageqp = new Intent(MainActivity.this, MessagesQP.class);
startActivity(Startmessageqp);
}
});
fabtn3 = (FloatingActionButton) findViewById(R.id.fab3);
fabtn4 = (FloatingActionButton) findViewById(R.id.fab4);
}
};
这是按下按钮后应该打开的新 Activity :
public class MessagesQP extends Activity {
EditText editText1;
EditText editText2;
FloatingActionButton fabMQ1;
FloatingActionButton fabQM2;
@Override
public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) {
super.onCreate(savedInstanceState, persistentState);
setContentView(R.layout.message_quickpost);
editText1 = (EditText) findViewById(R.id.editText);
editText2 = (EditText) findViewById(R.id.editText2);
fabMQ1 = (FloatingActionButton) findViewById(R.id.fabmq1);
fabQM2 = (FloatingActionButton) findViewById(R.id.fabmq2);
}
}
如果您需要更多信息来帮助,请告知,我感谢您的每一个回答!
新:这里是 messages_quickpost.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:layout_width="240dp"
android:layout_height="wrap_content"
android:id="@+id/editText"
android:text="Type Message"
android:layout_marginTop="100dp"
android:layout_below="@+id/editText2"
android:layout_centerHorizontal="true" />
<EditText
android:layout_width="240dp"
android:layout_height="60dp"
android:inputType="textPersonName"
android:text="Contact Name"
android:id="@+id/editText2"
android:layout_alignParentTop="true"
android:layout_alignLeft="@+id/editText"
android:layout_alignStart="@+id/editText"
android:layout_marginTop="60dp" />
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/fabmq1"
android:src="@drawable/send"
android:layout_alignBottom="@+id/editText"
android:layout_toRightOf="@+id/editText"
android:layout_toEndOf="@+id/editText" />
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/fabmq2"
android:src="@drawable/account_plus"
android:layout_alignTop="@+id/editText2"
android:layout_toLeftOf="@+id/editText2"
android:layout_toStartOf="@+id/editText2" />
</RelativeLayout>
感谢您的帮助!!
最佳答案
感谢大家的帮助,我终于找到了解决方案。创建部分是错误的!我现在将其切换自:
@Override
public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) {
super.onCreate(savedInstanceState, persistentState);
setContentView(R.layout.message_quickpost);
至:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.message_quickpost);
这就是问题所在..现在它可以工作了!还是谢谢大家!
关于android - 为什么我的 Intent 启动一个空的 Activity 而不是正确的 Activity ?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35366073/