从片段中的按钮更改 activity

Question

大家早上好，我是 android 的新手，我想放置片段按钮的动作...我正在使用这种方式：

    Button butt1=(Button)findViewById(R.id.btn1);



    butt1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent int1=new Intent(MainActivity.this,newactivity.class);
            startActivity(int1);


            finish();



        }
    });

问题是我不知道把这个动作放在哪里，如果在主activityclass或者在导入片段class，导入片段class 是一个带有按钮的列表，我希望每个按钮都移动到另一个 activity.

这是 ImportFragment.class 代码：

    public class ImportFragment extends Fragment {
ListView listView;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_import,container,false);



    return rootView;

}

}

这是主要 Activity 代码，通过横向导航抽屉引导至该片段：

    public class MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener, OnMapReadyCallback {
private GoogleMap mMap;
Button enobutt=(Button)findViewById(R.id.enobtn);

SupportMapFragment sMapFragment;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    sMapFragment = SupportMapFragment.newInstance();
    sMapFragment.getMapAsync(this);

    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);


    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
            this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
    drawer.setDrawerListener(toggle);
    toggle.syncState();

    NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
    navigationView.setNavigationItemSelectedListener(this);

    android.app.FragmentManager fm = getFragmentManager();
    android.support.v4.app.FragmentManager rFm = getSupportFragmentManager();
    if(!sMapFragment.isAdded())
        rFm.beginTransaction().add(R.id.map, sMapFragment).commit();
    else
        rFm.beginTransaction().show(sMapFragment).commit();



}

@Override
public void onBackPressed() {
    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    if (drawer.isDrawerOpen(GravityCompat.START)) {
        drawer.closeDrawer(GravityCompat.START);
    } else {
        super.onBackPressed();
    }
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {

    android.app.FragmentManager fn = getFragmentManager();
    android.support.v4.app.FragmentManager sFm = getSupportFragmentManager();
    int id = item.getItemId();

    if(sMapFragment.isAdded())
         sFm.beginTransaction().hide(sMapFragment).commit();

    if (id == R.id.nav_camera) {
        fn.beginTransaction().replace(R.id.content_frame,  new ImportFragment()).commit();

    } else if (id == R.id.nav_gallery) {
        if(!sMapFragment.isAdded())
        sFm.beginTransaction().add(R.id.map, sMapFragment).commit();
        else
             sFm.beginTransaction().show(sMapFragment).commit();

    } else if (id == R.id.nav_slideshow) {

    } else if (id == R.id.nav_manage) {

    } else if (id == R.id.nav_share) {

    } else if (id == R.id.nav_send) {

    }

    DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
    drawer.closeDrawer(GravityCompat.START);
    return true;
}

@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;}

}

我该怎么办？

Answer 1

喜欢这个....我对你的代码进行了更改

public class ImportFragment extends Fragment {
ListView listView;
@Nullable
@Override
enter code here

 Button butt1=(Button)findViewById(R.id.btn1);

 butt1.setOnClickListener(new View.OnClickListener() {
 @Override
 public void onClick(View v) {
 Intent int1=new Intent(MainActivity.this,newactivity.class);
 startActivity(int1);
 finish();
 }
 });
 return rootView;
 }
}

Answer 2

您只需要在 createView 中添加 onButtonClick

并添加以下行

 startActivity(new Intent(getActivity(), YourOtherActivity.class));

Answer 3

将您的片段编辑为

public class ImportFragment extends Fragment {
    ListView listView;
    private Activity activity;

    public ImportFragment(Activity activity) {
        this.activity = activity;
    }    

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_import,container,false);

        return rootView;

    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        Button btn1 = (Button) view.findViewById(R.id.btn1);

        btn1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(activity, newactivity.class);
                activity.startActivity(intent);
                activity.finish();

            }
        });
    }
}

Answer 4

你的问题问得很好，但这是一个概念问题，完全取决于你想做什么。如果您希望片段中的按钮操作在每次 post 该片段时都相同，您可以将 OnClickListener 留在该片段中。否则使用回调方法将其放入 activity 中。（参见 callback doc）

另一个好的做法是使用 MVP 模式（Model View Presenter），将视图与逻辑分开。

Answer 5

试试这个对你有帮助

butt1.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View v) {
  startActivity(new Intent(getActivity(), YourActivity.class));
 }
});

从片段中的按钮更改 activity

Change activity from button in a fragment

java

android

button

android-fragments

android-fragmentactivity