所以我试图让我的按钮在我的导航抽屉片段中打开新的活动但是我的MainActivity.java中出现了一些错误
我的MainActivity.java ....
package east.myapplication;
import android.support.design.widget.NavigationView;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
DrawerLayout drawerLayout;
Toolbar toolbar;
ActionBarDrawerToggle actionBarDrawerToggle;
android.support.v4.app.FragmentTransaction fragmentTransaction;
NavigationView navigationView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.drawer_open,
R.string.drawer_close);
drawerLayout.setDrawerListener((actionBarDrawerToggle));
fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.main_container,new HomeFragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("Home Fragment...");
navigationView = (NavigationView)findViewById(R.id.navigation_view);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem item) {
switch (item.getItemId())
{
case R.id.home_id:
fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.main_container, new HomeFragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("Home Fragment");
item.setChecked(true);
drawerLayout.closeDrawers();
break;
case R.id.id_rewards:
fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.main_container, new RewardsFragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("Rewards");
item.setChecked(true);
drawerLayout.closeDrawers();
break;
case R.id.id_settings:
fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.main_container, new SettingsFragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("Settings Fragment");
item.setChecked(true);
drawerLayout.closeDrawers();
break;
}
return true;
}
});
}
@Override
protected void onPostCreate (Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
actionBarDrawerToggle.syncState();
}
}
和我的奖励片段......
package east.myapplication;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class RewardsFragment extends Activity {
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_rewards);
Button button = (Button) findViewById(R.id.button);
Button anotherButton = (Button) findViewById(R.id.button2);
Button anotherButton2 = (Button) findViewById(R.id.button3);
Button anotherButton3 = (Button) findViewById(R.id.button4);
Button anotherButton4 = (Button) findViewById(R.id.button5);
Button anotherButton5 = (Button) findViewById(R.id.button6);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent intent = new Intent(RewardsFragment.this, AmazonActivity.class);
RewardsFragment.this.startActivity(intent);
}
});
/* new button to open a new activity */
anotherButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
// creating the intent
Intent intent = new Intent(RewardsFragment.this, CVSActivity.class);
// starting activity with the created intent
startActivity(intent);
}
});
/* new button to open a new activity */
anotherButton2.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
// creating the intent
Intent intent = new Intent(RewardsFragment.this, SephoraActivity.class);
// starting activity with the created intent
startActivity(intent);
}
});
/* new button to open a new activity */
anotherButton3.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
// creating the intent
Intent intent = new Intent(RewardsFragment.this, PlayStationActivity.class);
// starting activity with the created intent
startActivity(intent);
}
});
/* new button to open a new activity */
anotherButton4.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
// creating the intent
Intent intent = new Intent(RewardsFragment.this, AMCActivity.class);
// starting activity with the created intent
startActivity(intent);
}
});
/* new button to open a new activity */
anotherButton5.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
// creating the intent
Intent intent = new Intent(RewardsFragment.this, BKActivity.class);
// starting activity with the created intent
startActivity(intent);
}
});
}
}
问题是fragmentTransaction.replace(R.id.main_container, new RewardsFragment()); RewardsFragment下面有一个红色下划线，我不知道如何修复它
我尝试了一切，这就是我到目前为止所做的......
package east.myapplication;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.widget.Button;
import android.support.v4.app.Fragment;
public class RewardsFragment extends Fragment {
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_rewards);
Button button = (Button) findViewById(R.id.button);
Button anotherButton = (Button) findViewById(R.id.button2);
Button anotherButton2 = (Button) findViewById(R.id.button3);
Button anotherButton3 = (Button) findViewById(R.id.button4);
Button anotherButton4 = (Button) findViewById(R.id.button5);
Button anotherButton5 = (Button) findViewById(R.id.button6);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent intent = new Intent(RewardsFragment.this, AmazonActivity.class);
RewardsFragment.this.startActivity(intent);
}
});
/* new button to open a new activity */
anotherButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
// creating the intent
Intent intent = new Intent(RewardsFragment.this, CVSActivity.class);
// starting activity with the created intent
startActivity(intent);
}
});
/* new button to open a new activity */
anotherButton2.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
// creating the intent
Intent intent = new Intent(RewardsFragment.this, SephoraActivity.class);
// starting activity with the created intent
startActivity(intent);
}
});
/* new button to open a new activity */
anotherButton3.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
// creating the intent
Intent intent = new Intent(RewardsFragment.this, PlayStationActivity.class);
// starting activity with the created intent
startActivity(intent);
}
});
/* new button to open a new activity */
anotherButton4.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
// creating the intent
Intent intent = new Intent(RewardsFragment.this, AMCActivity.class);
// starting activity with the created intent
startActivity(intent);
}
});
/* new button to open a new activity */
anotherButton5.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
// creating the intent
Intent intent = new Intent(RewardsFragment.this, BKActivity.class);
// starting activity with the created intent
startActivity(intent);
}
});}
}
我的setContentView是鲜红色，我的findViewByID是红色，最后是（RewardsFragment.this，AmazonActivity.class）;和我所有的其他.class一起是红色的
这是我的错误
错误：（25,9）错误：找不到符号方法setContentView（int）
错误：（26,34）错误：找不到符号方法findViewById（int）
错误：（27,41）错误：找不到符号方法findViewById（int）
错误：（28,42）错误：找不到符号方法findViewById（int）
错误：（29,42）错误：找不到符号方法findViewById（int）
错误：（30,42）错误：找不到符号方法findViewById（int）
错误：（31,42）错误：找不到符号方法findViewById（int）
错误：（34,33）错误：没有为Intent找到合适的构造函数（RewardsFragment，Class） 构造函数Intent.Intent（String，Uri）不适用 （参数不匹配; RewardsFragment无法转换为String） 构造函数Intent.Intent（Context，Class）不适用 （参数不匹配; RewardsFragment无法转换为上下文）
错误：（43,33）错误：没有为Intent找到合适的构造函数（RewardsFragment，Class） 构造函数Intent.Intent（String，Uri）不适用 （参数不匹配; RewardsFragment无法转换为String） 构造函数Intent.Intent（Context，Class）不适用 （参数不匹配; RewardsFragment无法转换为上下文）
错误：（53,33）错误：没有为Intent找到合适的构造函数（RewardsFragment，Class） 构造函数Intent.Intent（String，Uri）不适用 （参数不匹配; RewardsFragment无法转换为String） 构造函数Intent.Intent（Context，Class）不适用 （参数不匹配; RewardsFragment无法转换为上下文）
错误：（63,33）错误：没有为Intent找到合适的构造函数（RewardsFragment，Class） 构造函数Intent.Intent（String，Uri）不适用 （参数不匹配; RewardsFragment无法转换为String） 构造函数Intent.Intent（Context，Class）不适用 （参数不匹配; RewardsFragment无法转换为上下文）
错误：（73,33）错误：找不到合适的构造函数（RewardsFragment，Class） 构造函数Intent.Intent（String，Uri）不适用 （参数不匹配; RewardsFragment无法转换为String） 构造函数Intent.Intent（Context，Class）不适用 （参数不匹配; RewardsFragment无法转换为上下文）
错误：（83,33）错误：没有为Intent找到合适的构造函数（RewardsFragment，Class） 构造函数Intent.Intent（String，Uri）不适用 （参数不匹配; RewardsFragment无法转换为String） 构造函数Intent.Intent（Context，Class）不适用 （参数不匹配; RewardsFragment无法转换为上下文）
错误：任务'：app：compileDebugJavaWithJavac'执行失败。
编译失败;有关详细信息，请参阅编译器错误输出。
答案 0 :(得分：2)
public class RewardsFragment extends Activity
你的＆＃34;片段＆＃34;实际上是一个活动。
将其更改为扩展Fragment并添加一个空白的公共构造函数，即
public class RewardsFragment extends Fragment {
public RewardsFragment(){
//Default blank constructor
}
//The rest of your code here
}
完全不用注意事项，你应该really consider using Butterknife代替@Bind和@Onclick而不是代码中的findViewByIds和点击监听器。它将有助于开始清理它。
答案 1 :(得分：1)
你必须
RewardsFragment extend Fragment
import android.support.v4.app.Fragment;
和
anotherButton3.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
// creating the intent
Intent intent = new Intent(getActivity, PlayStationActivity.class);
// starting activity with the created intent
getActivity.startActivity(intent);
}
});
替换
case R.id.home_id:
fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.main_container, new HomeFragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("Home Fragment");
item.setChecked(true);
drawerLayout.closeDrawers();
break;
到
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction()
.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
.replace(R.id.content_main, new HomeFragment())
.commit();
这是示例extend Fragment
public class SettingFragment extends Fragment implements View.OnClickListener {
private TextView mTextTest;
private TextView mTextTest1;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_setting, container, false);
addControl(view);
return view;
}
private void addControl(View view) {
mTextTest = (TextView) view.findViewById(R.id.text_test);
mTextTest1 = (TextView) view.findViewById(R.id.text_test_1);
mTextTest.setOnClickListener(this);
mTextTest1.setOnClickListener(this);
}
@Override
public void onClick(View v) {
FragmentManager manager = getActivity().getSupportFragmentManager();
switch (v.getId()) {
case R.id.text_test:
manager.beginTransaction()
.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
.replace(R.id.content_main, new YourFragment())
.commit();
break;
case R.id.text_test_1:
startActivity(new Intent(getActivity(), YourActivity.class))
break;
default:
break;
}
}
}