在android应用程序活动之间动态更新数据
我最近有一个问题(),我解决了部分问题,但我仍然有问题。我决定重新开始 这个简单的应用程序执行以下操作:在android应用程序活动之间动态更新数据,android,android-layout,android-intent,android-activity,broadcastreceiver,Android,Android Layout,Android Intent,Android Activity,Broadcastreceiver,我最近有一个问题(),我解决了部分问题,但我仍然有问题。我决定重新开始 这个简单的应用程序执行以下操作: 启动一个主活动,该活动在onCreate()方法期间立即调用“DataActivity” DataActivity仅递增一个数字,创建一个捆绑包,将该数字填充到该捆绑包中,然后将其发送到intent内部的LocalBroadcastManager中 MainActivity会备份该新编号并更新其ListView 现在,我的问题在于: (已修复)未广播意图!(它在我的上一个应用程序中起作用,
- (已修复)未广播意图!(它在我的上一个应用程序中起作用,但在这里完全不起作用)
- 我不知道如何确保MainActivity的列表位于显示屏的顶部
- 我不知道如何“最小化”数据活动
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = new Intent(this, DataActivity.class);
intent.putExtra("First", true);
startActivity(intent);
}
@Override
protected void onResume() {
super.onResume();
IntentFilter iff = new IntentFilter(MainActivity.class.getCanonicalName());
Log.d(getClass().getSimpleName(), "Creating Intent for Position Debuging...");
LocalBroadcastManager.getInstance(this).registerReceiver(AGDReceiver, iff);
}
@Override
protected void onDestroy() {
super.onDestroy();
LocalBroadcastManager.getInstance(this).unregisterReceiver(AGDReceiver);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private volatile ArrayAdapter<Integer> aradInt;
public BroadcastReceiver AGDReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final int broadcast = intent.getExtras().getInt("iInt");
Bundle b = intent.getExtras().getBundle("bBundle");
final int bI = b.getInt("bInt");
Log.d(getClass().getSimpleName(), "onReceieve(): " + broadcast);
initArrAd();
runOnUiThread(new Runnable() {
public void run() {
Log.d(getClass().getSimpleName(), "runOnUiThread(): " + broadcast);
aradInt.add(broadcast);
aradInt.setNotifyOnChange(true);
aradInt.notifyDataSetChanged();
}
});
}
};
private void initArrAd() {
if (aradInt == null) {
aradInt = new ArrayAdapter<Integer>(this.getApplicationContext(),R.id.listView1);
}
}
}
public class DataActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_data);
}
private volatile int count = 0;
@Override
protected void onResume() {
super.onResume();
Log.d(getClass().getSimpleName(), "onResume(): " + count);
count++;
Intent intent = new Intent(MainActivity.class.getCanonicalName());
Bundle b = new Bundle();
b.putInt("bInt", count);
intent.putExtra("iInt", count);
intent.putExtra("bBundle", b);
this.moveTaskToBack(true);
for (int i = 1; i < 100; i++) {
LocalBroadcastManager.getInstance(this).sendBroadcastSync(intent);
intent.removeExtra("iInt");
intent.removeExtra("bInt");
intent.putExtra("bInt", count++);
intent.putExtra("iInt", count);
}
Log.d(getClass().getSimpleName(), "onResume(): Done");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.data, menu);
return true;
}
}
公共类MainActivity扩展活动{
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
意向意向=新意向(此为DataActivity.class);
意图。putExtra(“第一”,真);
星触觉(意向);
}
@凌驾
受保护的void onResume(){
super.onResume();
IntentFilter iff=新的IntentFilter(MainActivity.class.getCanonicalName());
Log.d(getClass().getSimpleName(),“为位置调试创建意图…”);
LocalBroadcastManager.getInstance(this.registerReceiver(AGDReceiver,iff);
}
@凌驾
受保护的空onDestroy(){
super.ondestory();
LocalBroadcastManager.getInstance(this).unregisterReceiver(AGDReceiver);
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.main,menu);
返回true;
}
私人易失性ArrayaAdapter aradInt;
public BroadcastReceiver AGDReceiver=新的BroadcastReceiver(){
@凌驾
公共void onReceive(上下文、意图){
final int broadcast=intent.getExtras().getInt(“iInt”);
Bundle b=intent.getExtras().getBundle(“bBundle”);
最终整数bI=b.getInt(“bInt”);
Log.d(getClass().getSimpleName(),“onReceiveve():”+广播);
initArrAd();
runOnUiThread(新的Runnable(){
公开募捐{
Log.d(getClass().getSimpleName(),“runOnUiThread():”+广播);
阿拉丁.加(广播);
aradInt.setNotifyOnChange(true);
aradInt.notifyDataSetChanged();
}
});
}
};
私有void initArrAd(){
if(aradInt==null){
aradInt=newArrayAdapter(this.getApplicationContext(),R.id.listView1);
}
}
}
DataActivity.java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = new Intent(this, DataActivity.class);
intent.putExtra("First", true);
startActivity(intent);
}
@Override
protected void onResume() {
super.onResume();
IntentFilter iff = new IntentFilter(MainActivity.class.getCanonicalName());
Log.d(getClass().getSimpleName(), "Creating Intent for Position Debuging...");
LocalBroadcastManager.getInstance(this).registerReceiver(AGDReceiver, iff);
}
@Override
protected void onDestroy() {
super.onDestroy();
LocalBroadcastManager.getInstance(this).unregisterReceiver(AGDReceiver);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
private volatile ArrayAdapter<Integer> aradInt;
public BroadcastReceiver AGDReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
final int broadcast = intent.getExtras().getInt("iInt");
Bundle b = intent.getExtras().getBundle("bBundle");
final int bI = b.getInt("bInt");
Log.d(getClass().getSimpleName(), "onReceieve(): " + broadcast);
initArrAd();
runOnUiThread(new Runnable() {
public void run() {
Log.d(getClass().getSimpleName(), "runOnUiThread(): " + broadcast);
aradInt.add(broadcast);
aradInt.setNotifyOnChange(true);
aradInt.notifyDataSetChanged();
}
});
}
};
private void initArrAd() {
if (aradInt == null) {
aradInt = new ArrayAdapter<Integer>(this.getApplicationContext(),R.id.listView1);
}
}
}
public class DataActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_data);
}
private volatile int count = 0;
@Override
protected void onResume() {
super.onResume();
Log.d(getClass().getSimpleName(), "onResume(): " + count);
count++;
Intent intent = new Intent(MainActivity.class.getCanonicalName());
Bundle b = new Bundle();
b.putInt("bInt", count);
intent.putExtra("iInt", count);
intent.putExtra("bBundle", b);
this.moveTaskToBack(true);
for (int i = 1; i < 100; i++) {
LocalBroadcastManager.getInstance(this).sendBroadcastSync(intent);
intent.removeExtra("iInt");
intent.removeExtra("bInt");
intent.putExtra("bInt", count++);
intent.putExtra("iInt", count);
}
Log.d(getClass().getSimpleName(), "onResume(): Done");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.data, menu);
return true;
}
}
公共类DataActivity扩展活动{
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_数据);
}
私有易失性整数计数=0;
@凌驾
受保护的void onResume(){
super.onResume();
Log.d(getClass().getSimpleName(),“onResume():”+count);
计数++;
Intent Intent=新的Intent(MainActivity.class.getCanonicalName());
Bundle b=新Bundle();
b、 putInt(“bInt”,count);
意向。额外投入(“iInt”,计数);
意向。额外(“b包袱”,b);
此.moveTaskToBack(真);
对于(int i=1;i<100;i++){
LocalBroadcastManager.getInstance(this).sendBroadcastSync(intent);
意向。removeExtra(“iInt”);
意图。拆除(“bInt”);
intent.putExtra(“bInt”,count++);
意向。额外投入(“iInt”,计数);
}
d(getClass().getSimpleName(),“onResume():Done”);
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.data,menu);
返回true;
}
}
至于更新ListView,我认为一旦我一致地在我想要的地方获取数据,并且MainActivity的视图可见,这应该是微不足道的
以防万一,我的舱单
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.eks.mytestbed"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.eks.mytestbed.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.eks.mytestbed.DataActivity"
android:label="@string/title_activity_data" >
</activity>
</application>
</manifest>
更新:问题的广播部分似乎已关闭(我需要将取消注册调用放在.onDestroy()方法中,而不是.onPause()),但是更新MainActivity上的listview不起作用 问题是您没有注册您的
广播接收器。你必须注册一个接收者才能使用它,因此你必须在完成后注销它
因为您使用了LocalBroadcastReceiver,所以
登记
LocalBroadcastManager.getInstance(this).registerReceiver(
AGDReceiver ,
new IntentFilter(INTENT_FILTER_NAME));
注销
LocalBroadcastManager.getInstance(this).unregisterReceiver(
AGDReceiver );
另一件事是您的aradLong没有初始化问题是您没有注册您的广播接收器
。你必须注册一个接收者才能使用它,因此你必须在完成后注销它
因为您使用了LocalBroadcastReceiver,所以
登记
LocalBroadcastManager.getInstance(this).registerReceiver(
AGDReceiver ,
new IntentFilter(INTENT_FILTER_NAME));
注销
LocalBroadcastManager.getInstance(this).unregisterReceiver(
AGDReceiver );
另一件事是您的aradLong未初始化另一个提示,最好遵循命名约定。用小写字母开始一个实例的名称嗯,我实现了,但它仍然不起作用。广播接收器没有被呼叫。我承认,我忘了把注册号放在那里,但仍然。。。no go.使用与您注册时使用的相同名称发送广播。。在我的例子中,我使用了FILTER_NAMEaradLong不初始化其他提示,最好遵循命名约定。启动实例的名称