我的问题是如何在edittext中输入文本并以不同的布局显示。就像一个人输入文字并按下确定按钮一样。我想存储在edittext中输入的文本，然后在listview中显示它。我的MainActivity类是：
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.net.URI;
import java.net.URISyntaxException;
public class MainActivity extends Activity {
Button search;
Button website;
EditText onlineEdit;
TextView text;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
onlineEdit = (EditText) findViewById(R.id.searchEdit);
text = (TextView) findViewById(R.id.textView);
search = (Button) findViewById(R.id.searchGoogle);
search.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(onlineEdit.getText().toString().startsWith(" ")) {
Toast.makeText(getApplicationContext(), "No results!", Toast.LENGTH_SHORT).show();
} else {
try {
URI searchOnline = new URI("https://www.google.com/search?q=" +
onlineEdit.getText().toString().replace(" ", "+"));
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(String.valueOf(searchOnline)));
startActivity(browserIntent);
} catch (URISyntaxException e) {
Toast.makeText(getApplicationContext(), "Invalid URL", Toast.LENGTH_SHORT).show();
}
}
}
});
website = (Button) findViewById(R.id.openWebsite);
website.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(onlineEdit.getText().toString().startsWith(" ")) {
Toast.makeText(getApplicationContext(), "Please enter a valid URL", Toast.LENGTH_SHORT).show();
} else if(onlineEdit.getText().toString().equals("")) {
Toast.makeText(getApplicationContext(), "Please enter a URL", Toast.LENGTH_SHORT).show();
} else if (!(onlineEdit.getText().toString().contains("https://") && onlineEdit.getText().toString().contains(".com"))) {
onlineEdit.setText("https://" + onlineEdit.getText().toString() + ".com");
} else if(!(onlineEdit.getText().toString().contains("https://"))) {
onlineEdit.setText("https://" + onlineEdit.getText().toString());
} else if(!(onlineEdit.getText().toString().contains(".com"))) {
onlineEdit.setText(onlineEdit.getText().toString() + ".com");
} else {
try {
URI goOnline = new URI(onlineEdit.getText().toString());
Intent browserIntent2 = new Intent(Intent.ACTION_VIEW, Uri.parse(String.valueOf(goOnline)));
startActivity(browserIntent2);
} catch (URISyntaxException e) {
Toast.makeText(getApplicationContext(), "Invalid URL", Toast.LENGTH_SHORT).show();
}
}
}
});
search.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
startActivity(new Intent(MainActivity.this, HistoryActivity.class));
return true;
}
});
website.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
startActivity(new Intent(MainActivity.this, HistoryActivity.class));
return true;
}
});
}
}
接下来是我的HistoryActivity：
package applications.codegeek.com.goonline;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class HistoryActivity extends Activity {
ListView listView;
EditText search;
TextView text;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_history);
listView = (ListView) findViewById(R.id.listView);
search = (EditText) findViewById(R.id.searchEdit);
text = (TextView) findViewById(R.id.textView);
String[] history = new String[]{
text.getText().toString()
};
ArrayAdapter<String> adapter = new ArrayAdapter<>(getApplicationContext(), android.R.layout.simple_list_item_1,
android.R.id.text1, history);
// assign list view to adapter
listView.setAdapter(adapter);
// set on click
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
int intPosition = position;
String clickedValue = listView.getItemAtPosition(intPosition).toString();
Toast.makeText(getApplicationContext(), clickedValue, Toast.LENGTH_LONG).show();
}
});
}
}
请原谅我任何不正确的格式，因为我是初学者。
编辑：我跟着DanielOrdóñez的回答，现在我收到了以下错误 -09-05 11:00:34.022 20307-20307/applications.codegeek.com.goonline E/AndroidRuntime: FATAL EXCEPTION: main
Process: applications.codegeek.com.goonline, PID: 20307
java.lang.RuntimeException: Unable to start activity ComponentInfo{applications.codegeek.com.goonline/applications.codegeek.com.goonline.HistoryActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2358)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2420)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
at applications.codegeek.com.goonline.HistoryActivity.onCreate(HistoryActivity.java:34)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2311)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2420)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5292)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:904)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:699)
HistoryActivity中的第34行是bundle.getString("CONSTANT_NAME");
答案 0 :(得分：1)
EditText获取信息，其中包含：getText()
https://developer.android.com/reference/android/widget/EditText.html#getText() 2.您可以通过两种方式发送数据。
//Create the bundle
Bundle bundle = new Bundle();
//Add your data from getFactualResults method to bundle
bundle.putString("CONSTANT_NAME", EditText.getText);
//Add the bundle to the intent
browserIntent.putExtras(bundle);
startActivity(browserIntent);
在您应该使用的其他活动中：
Bundle bundle = getIntent().getExtras();
//Extract the data…
String value = bundle.getString("CONSTANT_NAME");
if (bundle.containsKey(MainActivity.CONSTANT_NAME)) {
....
}