Android学习-第19天
今天的任务为从fragment中启动activity,代码如下:
CrimeListFragment.java:
package com.bignerdranch.android.criminallntent; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import android.widget.Toast; import org.w3c.dom.Text; import java.util.List; public class CrimeListFragment extends Fragment { private RecyclerView mCrimeRecyclerView; private CrimeAdapter mAdapter; @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_crime_list, container, false); mCrimeRecyclerView = (RecyclerView) view.findViewById(R.id.crime_recycler_view); mCrimeRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); updateUI(); return view; } private void updateUI() { CrimeLab crimeLab=CrimeLab.get(getActivity()); List<Crime> crimes=crimeLab.getCrimes(); mAdapter=new CrimeAdapter(crimes); mCrimeRecyclerView.setAdapter(mAdapter); } private class CrimeHolder extends RecyclerView.ViewHolder implements View.OnClickListener{ private TextView mTitleTextView; private TextView mDateTextView; private Crime mCrime; public CrimeHolder(LayoutInflater inflater,ViewGroup parent) { super(inflater.inflate(R.layout.list_item_crime,parent,false)); itemView.setOnClickListener(this); mTitleTextView=(TextView)itemView.findViewById(R.id.crime_title); mDateTextView=(TextView)itemView.findViewById(R.id.crime_date); } public void bind(Crime crime){ mCrime=crime; mTitleTextView.setText(mCrime.getTitle()); mDateTextView.setText((mCrime.getDate().toString())); } @Override public void onClick(View view) { Intent intent=CrimeActivity.newIntent(getActivity(),mCrime.getId()); startActivity(intent); } } private class CrimeAdapter extends RecyclerView.Adapter<CrimeHolder>{ private List<Crime> mCrimes; public CrimeAdapter(List<Crime> crimes){ mCrimes=crimes; } @Override public CrimeHolder onCreateViewHolder(ViewGroup parent, int viewType) { LayoutInflater layoutInflater=LayoutInflater.from(getActivity()); return new CrimeHolder(layoutInflater,parent); } @Override public void onBindViewHolder(CrimeHolder holder, int position) { Crime crime=mCrimes.get(position); holder.bind(crime); } @Override public int getItemCount() { return mCrimes.size(); } } }
CrimeActivity.java
package com.bignerdranch.android.criminallntent; import android.content.Context; import android.content.Intent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v7.app.AppCompatActivity; import java.util.UUID; public class CrimeActivity extends SingleFragmentActivity { public static final String EXTRA_CRIME_ID="com.bignerdranch.android.criminalintent.crime_id"; public static Intent newIntent(Context packageContext, UUID crimeId){ Intent intent=new Intent(packageContext,CrimeActivity.class); intent.putExtra(EXTRA_CRIME_ID,crimeId); return intent; } @Override protected Fragment createFragment(){ return new CrimeFragment(); } }
CrimeFragment.java
package com.bignerdranch.android.criminallntent; import android.os.Bundle; import android.support.v4.app.Fragment; import android.text.Editable; import android.text.TextWatcher; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.Button; import android.widget.CheckBox; import android.widget.CompoundButton; import android.widget.CompoundButton.OnCheckedChangeListener; import android.widget.EditText; import java.util.UUID; public class CrimeFragment extends Fragment{ private Crime mCrime; private EditText mTitleField; private Button mDateButton; private CheckBox mSolvedCheckBox; @Override public void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); UUID crimeId=(UUID)getActivity().getIntent().getSerializableExtra(CrimeActivity.EXTRA_CRIME_ID); mCrime=CrimeLab.get(getActivity()).getCrime(crimeId); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState){ View v=inflater.inflate(R.layout.fragment_crime,container,false); mTitleField=(EditText)v.findViewById(R.id.crime_title); mTitleField.setText(mCrime.getTitle()); mTitleField.addTextChangedListener(new TextWatcher() { @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) { //This space intentionally left bank } @Override public void onTextChanged(CharSequence s, int start, int before, int count) { mCrime.setTitle(s.toString()); } @Override public void afterTextChanged(Editable s) { //This one too } }); mDateButton=(Button)v.findViewById(R.id.crime_date); mDateButton.setText(mCrime.getDate().toString()); mDateButton.setEnabled(false); mSolvedCheckBox=(CheckBox)v.findViewById(R.id.crime_solved); mSolvedCheckBox.setChecked(mCrime.isSolved()); mSolvedCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { mCrime.setSolved(isChecked); } }); return v; } }
截图如下: