我正在创建一个用于读取和写入 nfc 标签的应用程序，为此我创建了一个带有 4 个选项卡的选项卡菜单。这个应用程序有一个自定义标题栏和背景上的图像。
我试图在 api 16 中运行这个应用程序。
当按下 tab3 时，一切都会正确显示，我的自定义标题栏、我的背景和下面的 4 个选项卡。在此选项卡中，我有一个文本框和一个按钮，单击按钮时，文本框中的文本应传递给 nfc 标签，如果没有，则应读取标签数据。
发生的情况是，当我单击按钮而不是写入标签时，它正在读取，当它读取标签时，启动的活动是标签活动，但布局错误，它只出现定义的活动标题在清单中，黑色背景以及文本框和按钮。然后，如果我单击按钮写入标签，它会起作用，并且如果未单击按钮，则会读取标签。
现在我创建了第四个选项卡，里面有一个按钮，如果单击该按钮，它会启动一个新活动，并且这个 tagsactivity 运行良好。当这个类在 api13 之后被弃用时，问题是否与在 api16 中使用 tagsactivity 有关？还是我错过了另一件事。
这是tabs2
import android.app.LocalActivityManager;
import android.content.Intent;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnKeyListener;
import android.view.Window;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TabHost;
public class Tabs2 extends android.app.TabActivity{
public TabHost tabHost;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.activity_tabs);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.mytitle);
// Get the tabHost
this.tabHost = getTabHost();
Button btentrar= (Button) findViewById(R.id.titlebarRefreshBtn);
btentrar.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
setResult(2);
finish();
}
});
TabHost.TabSpec spec; // Resusable TabSpec for each tab
Intent intent; // Reusable Intent for each tab
// Create an Intent to launch the first Activity for the tab (to be reused)
intent = new Intent().setClass(this, FirstGroup.class);
// Initialize a TabSpec for the first tab and add it to the TabHost
spec = tabHost.newTabSpec("Opcções").setIndicator("FirstGroup",
getResources().getDrawable(R.drawable.settingsicon)) // Replace null with R.drawable.your_icon to set tab icon
.setContent(intent);
tabHost.addTab(spec);
// Create an Intent to launch an Activity for the tab (to be reused)
intent = new Intent().setClass(this, SecondActivityGroup.class);
// Initialize a TabSpec for the second tab and add it to the TabHost
spec = tabHost.newTabSpec("Tags passadas").setIndicator("Tags Passadas",
getResources().getDrawable(R.drawable.writedocumenticon)) // Replace null with R.drawable.your_icon to set tab icon
.setContent(intent);
tabHost.addTab(spec);
// Create an Intent to launch an Activity for the tab (to be reused)
intent = new Intent().setClass(this, ThirdActivityGroup.class);
// Initialize a TabSpec for the second tab and add it to the TabHost
spec = tabHost.newTabSpec("Read and write").setIndicator("Ler e escrever",
getResources().getDrawable(R.drawable.checkiconm)) // Replace null with R.drawable.your_icon to set tab icon
.setContent(intent);
tabHost.addTab(spec);
// Create an Intent to launch an Activity for the tab (to be reused)
intent = new Intent().setClass(this, FourthActivityGroup.class);
// Initialize a TabSpec for the second tab and add it to the TabHost
spec = tabHost.newTabSpec("Read and write v2").setIndicator("Ler e escrever v2",
getResources().getDrawable(R.drawable.checkiconm)) // Replace null with R.drawable.your_icon to set tab icon
.setContent(intent);
tabHost.addTab(spec);
tabHost.setCurrentTab(0);
}
}
这是扩展活动组的第三个活动组
import java.util.ArrayList;
import android.app.ActivityGroup;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class ThirdActivityGroup extends ActivityGroup {
// Keep this in a static variable to make it accessible for all the nested activities, lets them manipulate the view
public static ThirdActivityGroup group;
// Need to keep track of the history if you want the back-button to work properly, don't use this if your activities requires a lot of memory.
private ArrayList<View> history;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.history = new ArrayList<View>();
group = this;
// Start the root activity withing the group and get its view
View view = getLocalActivityManager().startActivity("TagsActivity", new
Intent(this,TagsActivity.class)
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))
.getDecorView();
// Replace the view of this ActivityGroup
replaceView(view);
}
public void replaceView(View v) {
// Adds the old one to history
history.add(v);
// Changes this Groups View to the new View.
setContentView(v);
}
public void back() {
if(history.size() > 0) {
history.remove(history.size()-1);
setContentView(history.get(history.size()-1));
}else {
finish();
}
}
public void onBackPressed() {
ThirdActivityGroup.group.back();
return;
}
}
这是第四个活动组
import java.util.ArrayList;
import android.app.ActivityGroup;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class FourthActivityGroup extends ActivityGroup {
// Keep this in a static variable to make it accessible for all the nested activities, lets them manipulate the view
public static FourthActivityGroup group;
// Need to keep track of the history if you want the back-button to work properly, don't use this if your activities requires a lot of memory.
private ArrayList<View> history;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.history = new ArrayList<View>();
group = this;
// Start the root activity withing the group and get its view
View view = getLocalActivityManager().startActivity("Teste", new
Intent(this,Teste.class)
.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP))
.getDecorView();
// Replace the view of this ActivityGroup
replaceView(view);
}
public void replaceView(View v) {
// Adds the old one to history
history.add(v);
// Changes this Groups View to the new View.
setContentView(v);
}
public void back() {
if(history.size() > 0) {
history.remove(history.size()-1);
setContentView(history.get(history.size()-1));
}else {
finish();
}
}
public void onBackPressed() {
FourthActivityGroup.group.back();
return;
}
}
这是睾丸
import java.util.ArrayList;
import android.app.Activity;
import android.app.ActivityGroup;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.Button;
public class Teste extends Activity {
// Keep this in a static variable to make it accessible for all the nested activities, lets them manipulate the view
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_teste);
Button btnfc= (Button) findViewById(R.id.button1);
btnfc.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(new Intent(Teste.this, TagsActivity.class));
}
});
}
}
这是标签活动
public class TagsActivity extends Activity {
private NfcAdapter mNfcAdapter;
private Button mEnableWriteButton;
private EditText mTextField;
private ProgressBar mProgressBar;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tags);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.mytitle);
mTextField = (EditText) findViewById(R.id.text_field);
mProgressBar = (ProgressBar) findViewById(R.id.progress_bar);
mProgressBar.setVisibility(View.GONE);
mEnableWriteButton = (Button) findViewById(R.id.enable_write_button);
mEnableWriteButton.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
setTagWriteReady(!isWriteReady);
mProgressBar.setVisibility(isWriteReady ? View.VISIBLE : View.GONE);
}
});
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
if (mNfcAdapter == null) {
Toast.makeText(this, "Sorry, NFC is not available on this device", Toast.LENGTH_SHORT).show();
finish();
}
}
private boolean isWriteReady = false;
/**
* Enable this activity to write to a tag
*
* @param isWriteReady
*/
public void setTagWriteReady(boolean isWriteReady) {
this.isWriteReady = isWriteReady;
if (isWriteReady) {
IntentFilter[] writeTagFilters = new IntentFilter[] { new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED) };
mNfcAdapter.enableForegroundDispatch(TagsActivity.this, NfcUtils.getPendingIntent(TagsActivity.this),
writeTagFilters, null);
} else {
// Disable dispatch if not writing tags
mNfcAdapter.disableForegroundDispatch(TagsActivity.this);
}
mProgressBar.setVisibility(isWriteReady ? View.VISIBLE : View.GONE);
}
@Override
public void onNewIntent(Intent intent) {
// onResume gets called after this to handle the intent
setIntent(intent);
}
@Override
public void onResume() {
super.onResume();
if (isWriteReady && NfcAdapter.ACTION_TAG_DISCOVERED.equals(getIntent().getAction())) {
processWriteIntent(getIntent());
} else if (!isWriteReady
&& (NfcAdapter.ACTION_TAG_DISCOVERED.equals(getIntent().getAction()) || NfcAdapter.ACTION_NDEF_DISCOVERED
.equals(getIntent().getAction()))) {
processReadIntent(getIntent());
}
}
private static final String MIME_TYPE = "application/com.smartcom.onetagv4";
/**
* Write to an NFC tag; reacting to an intent generated from foreground
* dispatch requesting a write
*
* @param intent
*/
public void processWriteIntent(Intent intent) {
if (isWriteReady && NfcAdapter.ACTION_TAG_DISCOVERED.equals(getIntent().getAction())) {
Tag detectedTag = getIntent().getParcelableExtra(NfcAdapter.EXTRA_TAG);
String tagWriteMessage = mTextField.getText().toString();
byte[] payload = new String(tagWriteMessage).getBytes();
if (detectedTag != null && NfcUtils.writeTag(
NfcUtils.createMessage(MIME_TYPE, payload), detectedTag)) {
Toast.makeText(this, "Wrote '" + tagWriteMessage + "' to a tag!",
Toast.LENGTH_LONG).show();
setTagWriteReady(false);
} else {
Toast.makeText(this, "Write failed. Please try again.", Toast.LENGTH_LONG).show();
}
}
}
public void processReadIntent(Intent intent) {
List<NdefMessage> intentMessages = NfcUtils.getMessagesFromIntent(intent);
List<String> payloadStrings = new ArrayList<String>(intentMessages.size());
for (NdefMessage message : intentMessages) {
for (NdefRecord record : message.getRecords()) {
byte[] payload = record.getPayload();
String payloadString = new String(payload);
if (!TextUtils.isEmpty(payloadString))
payloadStrings.add(payloadString);
}
}
if (!payloadStrings.isEmpty()) {
String content = TextUtils.join(",", payloadStrings);
Toast.makeText(TagsActivity.this, "Read from tag: " + content,
Toast.LENGTH_LONG).show();
}
}
}