Android开发中的Intent和Activity
周末撸了几次代码， 舍不得扔， 立此为照！ mainActivity.java package com.tw.flag.ch08_memo; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.ListView; public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener, AdapterView.OnItemLongClickListener { String[] aMemo = { "1.单击可以编辑备忘", "2.长按可以清除备忘", "3.", "4.", "5.", "6" }; ListView lv; ArrayAdapter<String> aa; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); lv = (ListView)findViewById(R.id.listView); aa = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, aMemo); lv.setAdapter(aa); lv.setOnItemClickListener(this); lv.setOnItemLongClickListener(this); } @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Intent it = new Intent(this, Edit.class); it.putExtra("备忘", aMemo[position]); startActivityForResult(it, position); } protected void onActivityResult(int requestCode, int resultCode, Intent it) { if (resultCode == RESULT_OK) { aMemo[requestCode] = it.getStringExtra("备忘"); aa.notifyDataSetChanged(); } } @Override public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) { aMemo[position] = (position+1) + "."; aa.notifyDataSetChanged(); return true; } } Edit.java package com.tw.flag.ch08_memo; import android.content.Intent; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.EditText; import android.widget.TextView; public class Edit extends AppCompatActivity { TextView txv; EditText edt; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_edit); Intent it = getIntent(); String s = it.getStringExtra("备忘"); txv = (TextView)findViewById(R.id.textView); txv.setText(s.substring(0, 2)); edt = (EditText)findViewById(R.id.editText); if (s.length() > 3) edt.setText(s.substring(3)); } public void onCancel(View v) { setResult(RESULT_CANCELED); finish(); } public void onSave(View v) { Intent it2 = new Intent(); it2.putExtra("备忘", txv.getText() + " " + edt.getText()); setResult(RESULT_OK, it2); finish(); } } 你的样子：
