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所以我創建了一個android應用程序，它打開用戶輸入的url。現在，每次用戶輸入一個url時，都需要使用「save」按鈕進行保存，並使用「list」按鈕查看保存列表。 這是我的XML文件：保存並在Android中列出的內容
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/content_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.application.mota_app.MainActivity"
tools:showIn="@layout/activity_main">
<TextView
android:text="@string/enter_the_url_below"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/enter_URL"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="26dp"
android:textSize="19sp"
android:textColor="@android:color/holo_green_dark" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/txtbox_website"
android:layout_marginTop="18dp"
android:width="300dp"
android:inputType="textUri"
android:layout_below="@+id/enter_URL"
android:layout_centerHorizontal="true" />
<Button
android:text="@string/save"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn_save"
android:textColor="@color/colorAccent"
android:onClick="save"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true" />
<Button
android:text="@string/visit"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:id="@+id/btn_visit"
android:textColor="@android:color/holo_blue_dark"
android:onClick="open"
android:layout_marginBottom="50dp"
android:layout_alignBottom="@+id/btn_save"
android:layout_centerHorizontal="true" />
<Button
android:text="@string/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/btn_list"
android:onClick="list"
android:textColor="?android:attr/colorPressedHighlight"
android:layout_below="@+id/btn_save"
android:layout_alignLeft="@+id/btn_save"
android:layout_alignStart="@+id/btn_save" />
</RelativeLayout>
這是被點擊列表按鈕時，將打開第二個活動的XML：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/show"
android:scrollbars="horizontal|vertical"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="63dp" />
<TextView
android:text="@string/list_of_saved_url_s"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="23dp"
android:id="@+id/textView"
android:textColor="@color/colorAccent"
android:textSize="24sp" />
</RelativeLayout>
這是我的主類：
public class MainActivity extends AppCompatActivity {
private EditText url;
private Button save;
ArrayList<String> addArray = new ArrayList<String>();
private Button list;
private ListView show1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
url = (EditText)findViewById(R.id.txtbox_website);
save = (Button)findViewById(R.id.btn_save);
list = (Button)findViewById(R.id.btn_list);
show1 = (ListView)findViewById(R.id.show);
}
public void open(View view){
if (url.getText().toString().matches("")) {
Toast.makeText(getApplicationContext(), "Enter a website to open!", Toast.LENGTH_SHORT).show();
return;
}
if (!url.getText().toString().startsWith("http://") && !url.getText().toString().startsWith("https://"))
{
url.setText("http://" + url.getText().toString());
}
if (!Patterns.WEB_URL.matcher(url.getText().toString()).matches())
{
Toast.makeText(getApplicationContext(), "Invalid URL!", Toast.LENGTH_SHORT).show();
url.setError("Enter a valid URL");
url.setText("");
url.setSelection(0);
return;
}
Intent browserIntent = new Intent(Intent.ACTION_VIEW, Uri.parse(url.getText().toString()));
startActivity(browserIntent);
}
public void save(View view) {
save.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String getInput = url.getText().toString();
if(addArray.contains(getInput))
{
Toast.makeText(getBaseContext(), "URL already added to the list!", Toast.LENGTH_LONG).show();
}
else if(getInput == null || getInput.trim().equals(""))
{
Toast.makeText(getBaseContext(), "Input field is empty!", Toast.LENGTH_LONG).show();
}
else{
addArray.add(getInput);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, addArray);
show1.setAdapter(adapter);
((EditText)findViewById(R.id.txtbox_website)).setText("");
}
}
});
}
public void list(View view) {
list.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent screen = new Intent(MainActivity.this, Activity2.class);
startActivity(screen);
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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;
}http://www.stackoverflow.com
return super.onOptionsItemSelected(item);
}
}
我的保存按鈕和列表按鈕無法保存並列出用戶輸入的URL。
我應該添加什麼？
感謝
非常感謝你 –