Java android在GridView更新之间等待
我有一个TextView的GridView,我想迭代每个TextView,改变它的背景,等待1秒,然后转到下一个TextView并做同样的事情 首先,所有文本视图都不着色 然后我想给第一个文本视图上色 现在我想等一秒钟 然后呢 并对其余的文本视图重复此操作 问题是,Java android在GridView更新之间等待,java,android,multithreading,gridview,android-adapter,Java,Android,Multithreading,Gridview,Android Adapter,我有一个TextView的GridView,我想迭代每个TextView,改变它的背景,等待1秒,然后转到下一个TextView并做同样的事情 首先,所有文本视图都不着色 然后我想给第一个文本视图上色 现在我想等一秒钟 然后呢 并对其余的文本视图重复此操作 问题是,MainActivity.playSoE(),用于更新网格的方法,使用notifyDataSetChanged()更新网格视图。这使得线程成为一个更大的问题。我尝试过的所有操作都会导致异常,或者冻结所有操作并跳过中间步骤,直到整
MainActivity.playSoE()
,用于更新网格的方法,使用notifyDataSetChanged()
更新网格视图。这使得线程成为一个更大的问题。我尝试过的所有操作都会导致异常,或者冻结所有操作并跳过中间步骤,直到整个网格着色为止。我尝试过使用Activity.runOnUiThread()
,wait()
,Thread.sleep()
,并尝试创建一个新的线程
,但这些都不适用于我。我
为了澄清这一点,我希望能够在网格着色时与应用程序的其余部分进行通信,我不希望整个应用程序冻结在我身上
MainActivity.java:
public class MainActivity extends ActionBarActivity {
private boolean mIsPlaying;
private int primesLE;
private GridView mGridView;
private ImageAdapter mAdapter;
private Thread mThread;
private void dataVisualization(){
int numOfColumns = (int)Math.round(Math.sqrt((double) primesLE));
//int numOfRows = (int)Math.ceil((double)primesLE/(double)numOfColumns);
ViewGroup.LayoutParams layoutParams;
layoutParams = mGridView.getLayoutParams();
layoutParams.width = 150*numOfColumns; //this is in pixels
mGridView.setLayoutParams(layoutParams);
mGridView.setNumColumns(numOfColumns);
mAdapter = new ImageAdapter(this, android.R.layout.simple_list_item_1, primesLE);
mGridView.setAdapter(mAdapter);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mIsPlaying = false;
primesLE = 0;
View relativeLayout = findViewById(R.id.relativeLayout);
View title_horizontalScrollView = relativeLayout.findViewById(R.id.title_horizontalScrollView);
View dataLayout = title_horizontalScrollView.findViewById(R.id.dataLayout);
mGridView = (GridView) dataLayout.findViewById(R.id.mGridView);
dataVisualization();
View inputLayout = relativeLayout.findViewById(R.id.inputLayout);
final EditText inputEditText = (EditText)inputLayout.findViewById(R.id.inputEditText);
inputEditText.setOnKeyListener(new EditText.OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
// If the event is a key-down event on the "enter" button
if ((event.getAction() == KeyEvent.ACTION_DOWN) &&
(keyCode == KeyEvent.KEYCODE_ENTER)) {
// Perform action on key press
InputMethodManager inputManager = (InputMethodManager) MainActivity.this.getSystemService(Context.INPUT_METHOD_SERVICE);
inputManager.hideSoftInputFromWindow(inputEditText.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
try {
primesLE = Integer.parseInt(inputEditText.getText().toString());
} catch(NumberFormatException nfe) {
inputEditText.setText("Try again");
primesLE = 0;
}
if(primesLE < 0)
primesLE = 0;
dataVisualization();
Toast.makeText(MainActivity.this, inputEditText.getText(), Toast.LENGTH_SHORT).show();
return true;
}
return false;
}
});
inputEditText.setOnClickListener(new EditText.OnClickListener() {
@Override
public void onClick(View v) {
inputEditText.getText().clear();
}
});
}
@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;
}
private void playSoE(){
for(int i = 0; i < primesLE; i++) {
mAdapter.setPositionColor(i, 0xffff0000 + 0x100 * i); //calls notifyDataSetChanged()
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
notifyDataSetChanged();
}
}, 1000);
}
}
@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();
Log.d("Menu","Button Pressed");
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
else if (id == R.id.action_status){
if(mIsPlaying) {
mIsPlaying = false;
item.setIcon(R.drawable.ic_action_play);
item.setTitle("Play");
playSoE();
}
else {
mIsPlaying = true;
item.setIcon(R.drawable.ic_action_pause);
item.setTitle("Pause");
}
return true;
}
return super.onOptionsItemSelected(item);
}
}
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/relativeLayout"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:id="@+id/inputLayout"
android:layout_alignParentTop="true"
android:background="#a9a9a9"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center_vertical"
android:id="@+id/textView"
android:text="All primes less than\n or equal to this number:"
android:layout_centerVertical="true"
android:layout_alignParentStart="true" />
<!-- Dummy item to prevent AutoCompleteTextView from receiving focus -->
<LinearLayout
android:focusable="true" android:focusableInTouchMode="true"
android:layout_width="0px" android:layout_height="0px"
android:inputType="numberSigned"/>
<!-- :nextFocusUp and :nextFocusLeft have been set to the id of this component
to prevent the dummy from receiving focus again -->
<AutoCompleteTextView android:id="@+id/autotext"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:nextFocusUp="@id/autotext" android:nextFocusLeft="@id/autotext"
android:inputType="numberSigned" android:imeOptions="actionDone"
android:layout_gravity="center_vertical" android:gravity="center_vertical"
android:layout_centerVertical="true" android:layout_toEndOf="@+id/textView"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center_vertical"
android:inputType="numberSigned"
android:ems="10"
android:id="@+id/inputEditText"
android:layout_centerVertical="true"
android:layout_alignEnd="@+id/autotext"
android:layout_toEndOf="@+id/textView" />
</RelativeLayout>
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/inputLayout"
android:id="@+id/title_horizontalScrollView"
android:fillViewport="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:id="@+id/dataLayout"
>
<GridView
android:id="@+id/mGridView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="90dp"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"
android:layout_alignParentBottom="true" />
</RelativeLayout>
</HorizontalScrollView>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item android:id="@+id/action_status"
android:icon="@drawable/ic_action_play"
android:title="Play"
app:showAsAction="always"/>
<item android:id="@+id/action_stop"
android:icon="@drawable/ic_action_stop"
android:title="Stop"
app:showAsAction="always"/>
<item android:id="@+id/action_settings"
android:title="@string/action_settings"
app:showAsAction="never" />
</menu>
menu_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/relativeLayout"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:id="@+id/inputLayout"
android:layout_alignParentTop="true"
android:background="#a9a9a9"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center_vertical"
android:id="@+id/textView"
android:text="All primes less than\n or equal to this number:"
android:layout_centerVertical="true"
android:layout_alignParentStart="true" />
<!-- Dummy item to prevent AutoCompleteTextView from receiving focus -->
<LinearLayout
android:focusable="true" android:focusableInTouchMode="true"
android:layout_width="0px" android:layout_height="0px"
android:inputType="numberSigned"/>
<!-- :nextFocusUp and :nextFocusLeft have been set to the id of this component
to prevent the dummy from receiving focus again -->
<AutoCompleteTextView android:id="@+id/autotext"
android:layout_width="fill_parent" android:layout_height="wrap_content"
android:nextFocusUp="@id/autotext" android:nextFocusLeft="@id/autotext"
android:inputType="numberSigned" android:imeOptions="actionDone"
android:layout_gravity="center_vertical" android:gravity="center_vertical"
android:layout_centerVertical="true" android:layout_toEndOf="@+id/textView"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:gravity="center_vertical"
android:inputType="numberSigned"
android:ems="10"
android:id="@+id/inputEditText"
android:layout_centerVertical="true"
android:layout_alignEnd="@+id/autotext"
android:layout_toEndOf="@+id/textView" />
</RelativeLayout>
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/inputLayout"
android:id="@+id/title_horizontalScrollView"
android:fillViewport="true">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:id="@+id/dataLayout"
>
<GridView
android:id="@+id/mGridView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="90dp"
android:verticalSpacing="10dp"
android:horizontalSpacing="10dp"
android:stretchMode="columnWidth"
android:gravity="center"
android:layout_alignParentBottom="true" />
</RelativeLayout>
</HorizontalScrollView>
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item android:id="@+id/action_status"
android:icon="@drawable/ic_action_play"
android:title="Play"
app:showAsAction="always"/>
<item android:id="@+id/action_stop"
android:icon="@drawable/ic_action_stop"
android:title="Stop"
app:showAsAction="always"/>
<item android:id="@+id/action_settings"
android:title="@string/action_settings"
app:showAsAction="never" />
</menu>
您可以使用处理程序延迟并执行操作 已编辑
for(int i = 0; i < primesLE; i++) {
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
mAdapter.setPositionColor(i, 0xffff0000 + 0x100 * i);
notifyDataSetChanged();
}
}, 1000);
}
for(int i=0;i
这将执行1秒并更新数据最终您应该切换到使用带有GridLayoutManager的RecyclerView。RecyclerView提供了非常灵活的方法来更新UI。在您的情况下,notifyItemChanged(int位置)将有效地更新单个TextView。了解更多信息。为一个更改arraylist,然后调用此方法,然后为另一个更改arraylist。您必须在for循环中执行此操作,更新每个arraylist。更改我的arraylist是什么意思?我这里没有使用任何ArrayList。我还使用for循环调用处理程序,每次更新一次。您可以在
MainActivity.playSoE()
中看到它。我已将您的代码添加到我的代码中,以向您展示我的尝试。请检查我更新了我的答案,您可以根据我编辑的答案进行更改