按钮将不会打开新活动
[英]Button won't open new activity
问题描述
所以我试图让我的按钮在导航抽屉片段中打开新的活动，但是MainActivity.java中出现了问题
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()); 它在RewardsFragment下有一个红色的下划线，我不知道如何解决
我尝试了一切，这就是我到目前为止所拥有的。
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是亮红色的，我的findViewByID是红色的，最后是（RewardsFragment.this，AmazonActivity.class）; 和其他所有.class一样是红色的
这是我的虫子
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（RewardsFragment，Class）构造函数Intent.Intent（String，Uri）找到合适的构造函数（参数不匹配； RewardsFragment无法转换为String）构造函数Intent.Intent（Context，类）不适用（参数不匹配； RewardsFragment无法转换为Context）
错误：（43，33）错误：没有为Intent（RewardsFragment，Class）构造函数Intent.Intent（String，Uri）找到合适的构造函数（参数不匹配； RewardsFragment无法转换为String）构造函数Intent.Intent（Context，类）不适用（参数不匹配； RewardsFragment无法转换为Context）
错误：（53、33）错误：找不到适用于Intent（RewardsFragment，Class）的合适构造函数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，类）不适用（参数不匹配； RewardsFragment无法转换为Context）
错误：（63、33）错误：没有为Intent（RewardsFragment，Class）构造函数Intent.Intent（String，Uri）找到合适的构造函数不适用（参数不匹配； RewardsFragment无法转换为String）构造函数Intent.Intent（Context，类）不适用（参数不匹配； RewardsFragment无法转换为Context）
错误：（73，33）错误：没有为Intent（RewardsFragment，Class）构造函数Intent.Intent（String，Uri）找到合适的构造函数（参数不匹配； RewardsFragment无法转换为String）构造函数Intent.Intent（Context，类）不适用（参数不匹配； RewardsFragment无法转换为Context）
错误：（83，33）错误：没有为Intent（RewardsFragment，Class）构造函数Intent.Intent（String，Uri）找到合适的构造函数（参数不匹配； RewardsFragment无法转换为String）构造函数Intent.Intent（Context，类）不适用（参数不匹配； RewardsFragment无法转换为Context）
错误：任务'：app：compileDebugJavaWithJavac'的执行失败。
编译失败； 有关详细信息，请参见编译器错误输出。
2 个解决方案
解决方案1
2 2016-03-11 04:08:35
public class RewardsFragment extends Activity
您的“片段”实际上是一个活动。
更改它以扩展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
}
需要特别注意的是，您应该真正考虑对@Bind和@Onclick 使用Butterknife ，而不要在代码中使用那么多的findViewByIds和click侦听器。 这将有助于开始清理它。
解决方案2
1 已采纳 2016-03-11 04:19:03
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);
}
});
更换
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;
至
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction()
.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN)
.replace(R.id.content_main, new HomeFragment())
.commit();
这是扩展片段的例子
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;
}
}
}
按钮无法打开新活动
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