在您将此问题标记为重复之前，请知道我已尝试this和this。
我的消息中出现以下错误：
let button = UIButton(frame: yourView.bounds)
button.addTarget(target: self, action:#selector(self.yourmethodName), forControlEvents: .TouchDragInside)
这是我的 MainActivity.java
Information:Gradle tasks [:app:generateDebugSources, :app:generateDebugAndroidTestSources]
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preReleaseBuild UP-TO-DATE
:app:prepareComAndroidSupportAppcompatV72311Library UP-TO-DATE
:app:prepareComAndroidSupportDesign2311Library UP-TO-DATE
:app:prepareComAndroidSupportRecyclerviewV72311Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42311Library UP-TO-DATE
:app:prepareDebugDependencies
:app:compileDebugAidl UP-TO-DATE
:app:compileDebugRenderscript UP-TO-DATE
:app:generateDebugBuildConfig UP-TO-DATE
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets UP-TO-DATE
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources UP-TO-DATE
:app:mergeDebugResources UP-TO-DATE
:app:processDebugManifest UP-TO-DATE
:app:processDebugResources
D:\AndroidStudioProject\BlueAlert\app\src\main\res\layout\content_connected.xml
Error:(15, 21) No resource found that matches the given name (at 'id' with value '@id/screenimageView').
Error:Execution failed for task ':app:processDebugResources'.
> com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'D:\ANDROID\AndroidSDK\build-tools\23.0.2\aapt.exe'' finished with non-zero exit value 1
Information:BUILD FAILED
Information:Total time: 5.214 secs
Information:2 errors
Information:0 warnings
Information:See complete output in console
这是我的 content_connected.xml
package vertex2016.mvjce.edu.bluealert;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.ActivityInfo;
import android.os.Bundle;
import android.os.Handler;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Gravity;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.*;
import java.util.UUID;
import static java.lang.Thread.sleep;
public class MainActivity extends AppCompatActivity {
//To get the default Bluetooth adapter on the Android device
public BluetoothAdapter BA = BluetoothAdapter.getDefaultAdapter();
//A request code to identify which activity was executed
private int REQ_CODE = 1;
private boolean on = false;
//The Search button on the main screen
private Button searchButton;
//The View that lists all the nearby Bluetooth devices found
private ListView listBTDevices;
//Display the welcome text
private TextView BTDesc;
//Store the recently found Bluetooth devices & pass them on to the ListView
private ArrayAdapter BTArrayAdapter;
//A variable that points to the actual Bluetooth on the device
private BluetoothDevice btd;
//UUID to specify the services it can provide
//Intent Filter to detect the discovery of nearby Bluetooth devices
IntentFilter filter = new IntentFilter(BluetoothDevice.ACTION_FOUND);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//Lock the rotation of the screen
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LOCKED);
searchButton = (Button) findViewById(R.id.searchButton);
listBTDevices = (ListView) findViewById(R.id.listBTDevices);
//Initially the ListView will be hidden, only after the Search button has been pressed,
// the ListView will be visible
listBTDevices.setVisibility(View.GONE);
BTDesc = (TextView) findViewById(R.id.BTDesc);
searchButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (!on) {
connect();
} else if (on) {
stopDiscovery();
on = false;
searchButton.setText("Search");
}
}
});
}
@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;
}
return super.onOptionsItemSelected(item);
}
//A method that checks if targeted device supports Bluetoth or not
//In case it does, execute the SearchBTDevices method to search
public void connect() {
//Registering the IntentFilter
this.registerReceiver(receiver, filter);
//If the device doesn't have Bluetooth, the Bluetooth Adapter BA returns NULL
if (BA == null)
Toast.makeText(MainActivity.this, "System Doesn't Support Bluetooth", Toast.LENGTH_SHORT).show();
//In case the device has Bluetooth, but Bluetooth isn't enabled
//Enables the Bluetooth on the device
//startActivityForResult() takes in the Intent & a REQUEST CODE to specifically identify that intent
else if (!BA.isEnabled()) {
Intent enableBT = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(enableBT, REQ_CODE);
}
//In case Bluetooth is enabled on the device, start the discovery
else {
searchBTDevices();
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode != RESULT_CANCELED) {
Toast.makeText(MainActivity.this, "TURNED ON!", Toast.LENGTH_SHORT).show();
searchBTDevices();
} else
Toast.makeText(MainActivity.this, "FAILED TO ENABLE BLUETOOTH", Toast.LENGTH_LONG).show();
}
public void searchBTDevices() {
//As soon as the search starts, the Welcome screen TextView disappears & ListView appears
BTDesc.setVisibility(View.GONE);
listBTDevices.setVisibility(View.VISIBLE);
BTArrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1);
//In case the discovery fails to begin
if (!BA.startDiscovery())
Toast.makeText(MainActivity.this, "Failed to start discovery", Toast.LENGTH_SHORT).show();
else {
Toast.makeText(MainActivity.this, "Discovery Started", Toast.LENGTH_SHORT).show();
on = true;
searchButton.setText("Stop Discovery");
}
listBTDevices.setAdapter(BTArrayAdapter);
//Setting the onItemClick for selecting a Bluetooth device to connect to
listBTDevices.setOnItemClickListener(clickListener);
}
private final BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (BluetoothDevice.ACTION_FOUND.equals(action)) {
btd = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE); //Get the device details
BTArrayAdapter.add(btd.getName() + "\t\t" + btd.getAddress());
}
}
};
private void stopDiscovery() {
BA.cancelDiscovery();
Toast.makeText(MainActivity.this, "Discovery Stopped", Toast.LENGTH_SHORT).show();
this.unregisterReceiver(receiver);
}
@Override
protected void onResume() {
super.onResume();
BA.cancelDiscovery();
BA.startDiscovery();
}
@Override
protected void onRestart() {
super.onRestart();
BTArrayAdapter.clear();
Toast.makeText(MainActivity.this, "Discovery Resumed", Toast.LENGTH_SHORT).show();
}
public final AdapterView.OnItemClickListener clickListener = new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id)
{
Intent connectedBT = new Intent(MainActivity.this, Connected.class);
connectedBT.putExtra("Bluetooth Device", btd);
startActivity(connectedBT);
}
};
}
我尝试清理项目，重建项目＆amp;将它与gradle同步。这些都不起作用......
请帮忙。谢谢你的时间!!
答案 0 :(得分：3)
你错过了＆＃34; +＆＃34;，试试@ + id / screenimageView
答案 1 :(得分：0)
将ImageView代码更改为：
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/screenimageView"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
当你定义一个新视图时，它的id应该像这样定义：
android:id="@+id/screenimageView"
而不是这个：
android:id="+@id/screenimageView"
或者这个：
android:id="@id/screenimageView"
答案 2 :(得分：0)
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
机器人：ID = “@ + ID / screenimageView”
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true" />
您尚未指定+号，这意味着您正在创建对ImageView小部件的引用