我需要知道如何将某个键集的值转换为另一种活动形式。我有一个列表,其中包含一个键以及该键中的所有值。我想要它,以便当用户单击列表中的项目时,另一个活动将加载该单击的特定项目的值。
例如,如果我有一个名为“正在作为一个项目作为列表中的项运行”的键集,并且该键集的值是运行的StartTime和EndTime,那么如何仅将属于该集的这些值显示到下一个活动中。这很难解释,但是我希望我的代码能清楚说明我的要求。
public class ActivityLog extends Activity {
ListView listView ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_log);
// Get ListView object from xml
listView = (ListView) findViewById(R.id.list);
listView.setFriction(ViewConfiguration.getScrollFriction() * 0);
// ListView Item Click Listener
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
int itemPosition = position;
String itemValue = (String) listView.getItemAtPosition(position);
// ListView Clicked item index
// ListView Clicked item value
// Show Alert
Toast.makeText(getApplicationContext(), "Position :"+itemPosition+" ListItem : " +itemValue , Toast.LENGTH_LONG).show();
}
});
}
@Override
protected void onStart()
{
SharedPreferences userInfo = getSharedPreferences("userData", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = userInfo.edit();
String myString = userInfo.getAll().keySet().toString();
String[] values = new String[] { myString };
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.activity_list_item, android.R.id.text1 );
Map<String, ?> allEntries = userInfo.getAll();
for (Map.Entry<String, ?> entry : allEntries.entrySet()) {
Log.d("map values", entry.getKey() + ": " + entry.getValue().toString());
adapter.add(entry.getKey()+ ": " + entry.getValue().toString());
listView.setAdapter(adapter);
}
super.onStart();
}
public void showLog (View view){
Intent intent = new Intent(this, ActivityNewLog.class);
startActivity(intent);
}
public void deleteLog (View view){
SharedPreferences settings = getSharedPreferences("userData", Context.MODE_PRIVATE);
settings.edit().clear().commit();
getSharedPreferences("userData", 0).edit().clear().commit();
}
public void dataShow (View view){
Intent intent = new Intent(this, Log_Data.class);
startActivity(intent);
}
}
这是我要加载值的活动:
public class Log_Data extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_log__data);
TextView data = (TextView)findViewById(R.id.textView5);
SharedPreferences userInfo = getSharedPreferences("userData", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = userInfo.edit();
String myString = userInfo.getAll().keySet().toString();
String[] values = new String[] { myString };
//ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.activity_list_item, android.R.id.text1 );
Map<String, ?> allEntries = userInfo.getAll();
for (Map.Entry<String, ?> entry : allEntries.entrySet()) {
data.setText(entry.getKey()+ ": " + entry.getValue().toString());
}
}
}
我还应该提到,我希望它们存储在textView中。
最佳答案
将值保存到String中,然后使用onItemClick
侦听器上的Bundle将值传递给其他活动,以从其他活动中检索值。例如 -
第一次活动
Intent i = new Intent(this, secondActivity.class);
//Create the bundle
Bundle bundle = new Bundle();
//Add your data from getFactualResults method to bundle
bundle.putString("TAG", yourvalue);
//Add the bundle to the intent
i.putExtras(bundle);
startActivity(i);
在第二活动中
Bundle bundle = getIntent().getExtras();
//Extract the data…
String something = bundle.getString("TAG");
//Create the text view
TextView textView = new TextView(this);
textView.setText(TAG);