Android,java-无法从asynctask更新变量
这是密码 声明的变量Android,java-无法从asynctask更新变量,java,android,android-asynctask,Java,Android,Android Asynctask,这是密码 声明的变量 public String gpu2dcurent = "1234567"; Asynctask,完成后应该更新变量gpu2dcurent,但它没有 private class readgpu2d extends AsyncTask<String, Void, String> { protected String doInBackground(String... args) { Log.i("MyApp", "Backgrou
public String gpu2dcurent = "1234567";
Asynctask,完成后应该更新变量gpu2dcurent,但它没有
private class readgpu2d extends AsyncTask<String, Void, String> {
protected String doInBackground(String... args) {
Log.i("MyApp", "Background thread starting");
String aBuffer = "";
try {
File myFile = new File("/sys/devices/platform/kgsl-2d0.0/kgsl/kgsl-2d0/gpuclk");
FileInputStream fIn = new FileInputStream(myFile);
BufferedReader myReader = new BufferedReader(
new InputStreamReader(fIn));
String aDataRow = "";
//String aBuffer = "";
while ((aDataRow = myReader.readLine()) != null) {
aBuffer += aDataRow + "\n";
}
;
myReader.close();
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
}
return aBuffer.trim();
}
protected void onPostExecute(String result) {
// Pass the result data back to the main activity
gpu2dcurent = result;
//Toast.makeText(getBaseContext(), result,
//Toast.LENGTH_SHORT).show();
gpu.this.data = result;
if (gpu.this.pd != null) {
//gpu.this.pd.dismiss();
}
}
}
我错过什么了吗?当我从onPostExecute方法内部更新textView时,它工作正常,但当Asynctask完成时,变量值重置为默认值
public class gpu extends Activity{
public String gpu2dcurent = "1234567";
在gpu类中声明如下:
public String gpu2dcurent = "1234567";
在AsyncTask类readgpu2d中,按如下方式使用它:
gpu.gpu2dcurent = result;
更新您的UI=用户界面意味着 onProgressUpdate() 异步任务的方法
And check where have you declared gpu2dcurent variable???
我怀疑您是否试图在完成任务之前设置
TextView
的文本。
是,或者设置为,静态公共字符串gpu2dcurent=“1234567”代码>
或者,在onPostExecute()
更新:
更新相关代码后
换一行,
new readgpu2d().execute("blablabla");
到
尝试将setText放入onPostExecute
protected void onPostExecute(String result) {
// Pass the result data back to the main activity
gpu2dcurent = result;
//Toast.makeText(getBaseContext(), result,
//Toast.LENGTH_SHORT).show();
gpu.this.data = result;
if (gpu.this.pd != null) {
//gpu.this.pd.dismiss();
}
tx.setText(gpu2dcurent);
}
}
protected void onPostExecute(String result) {
TextView tx = (TextView)findViewById(R.id.textView3);
tx.setText(result);
// Pass the result data back to the main activity
gpu2dcurent = result;
//Toast.makeText(getBaseContext(), result,
//Toast.LENGTH_SHORT).show();
gpu.this.data = result;
if (gpu.this.pd != null) {
//gpu.this.pd.dismiss();
}
}
这是全部代码
package rs.pedjaapps.DualCore;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;
import java.util.concurrent.TimeoutException;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.TextView;
import android.widget.Toast;
import com.stericson.RootTools.RootTools;
import com.stericson.RootTools.RootToolsException;
public class gpu extends Activity{
public String gpu2dcurent = "1234567";
private ProgressDialog pd = null;
private Object data = null;
private class readgpu2d extends AsyncTask<String, Void, String> {
protected String doInBackground(String... args) {
Log.i("MyApp", "Background thread starting");
String aBuffer = "";
try {
File myFile = new File("/sys/devices/platform/kgsl-2d0.0/kgsl/kgsl-2d0/gpuclk");
FileInputStream fIn = new FileInputStream(myFile);
BufferedReader myReader = new BufferedReader(
new InputStreamReader(fIn));
String aDataRow = "";
//String aBuffer = "";
while ((aDataRow = myReader.readLine()) != null) {
aBuffer += aDataRow + "\n";
}
//gpu2dcurent = aBuffer.trim();
myReader.close();
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
}
return aBuffer.trim();
}
protected void onPostExecute(String result) {
// Pass the result data back to the main activity
gpu2dcurent = result;
//Toast.makeText(getBaseContext(), result,
//Toast.LENGTH_SHORT).show();
gpu.this.data = result;
if (gpu.this.pd != null) {
gpu.this.pd.dismiss();
}
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gpu);
this.pd = ProgressDialog.show(this, "Working..", "Loading...", true, false);
new readgpu2d().execute("blablabla");
TextView tx = (TextView)findViewById(R.id.textView3);
tx.setText(gpu2dcurent);
}
}
包rs.pedjaapps.DualCore;
导入java.io.BufferedReader;
导入java.io.File;
导入java.io.FileInputStream;
导入java.io.IOException;
导入java.io.InputStreamReader;
导入java.util.List;
导入java.util.concurrent.TimeoutException;
导入android.app.Activity;
导入android.app.ProgressDialog;
导入android.os.AsyncTask;
导入android.os.Bundle;
导入android.util.Log;
导入android.view.view;
导入android.widget.AdapterView;
导入android.widget.ArrayAdapter;
导入android.widget.Spinner;
导入android.widget.AdapterView.OnItemSelectedListener;
导入android.widget.TextView;
导入android.widget.Toast;
导入com.stericson.RootTools.RootTools;
导入com.stericson.RootTools.RootToolsException;
公共类gpu扩展活动{
公共字符串gpu2dcurent=“1234567”;
private ProgressDialog pd=null;
私有对象数据=null;
私有类readgpu2d扩展异步任务{
受保护的字符串doInBackground(字符串…args){
Log.i(“MyApp”,“后台线程启动”);
字符串aBuffer=“”;
试一试{
File myFile=新文件(“/sys/devices/platform/kgsl-2d0.0/kgsl/kgsl-2d0/gpuclk”);
FileInputStream fIn=新的FileInputStream(myFile);
BufferedReader myReader=新BufferedReader(
新的InputStreamReader(fIn));
字符串aDataRow=“”;
//字符串aBuffer=“”;
而((aDataRow=myReader.readLine())!=null){
aBuffer+=aDataRow+“\n”;
}
//gpu2dcurent=aBuffer.trim();
myReader.close();
}捕获(例外e){
Toast.makeText(getBaseContext(),e.getMessage(),
吐司。长度(短)。show();
}
返回附件trim();
}
受保护的void onPostExecute(字符串结果){
//将结果数据传回主活动
gpu2dcurent=结果;
//Toast.makeText(getBaseContext(),result,
//吐司。长度(短)。show();
gpu.this.data=结果;
如果(gpu.this.pd!=null){
gpu.this.pd.discouse();
}
}
}
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.gpu);
this.pd=ProgressDialog.show(这是“正在工作…”、正在加载…”、true、false);
新建readgpu2d().execute(“blablabla”);
TextView tx=(TextView)findViewById(R.id.textView3);
tx.setText(gpu2dcurent);
}
}
我知道这一点,而且这样做很好,但我需要的是将全局vaiable的值设置为asyncaskIn的结果,您在哪个类中声明了变量gpu2dcurent?在哪个类中声明了变量gpu2dcurent?我不需要更新TextView,我不需要它,只是为了查看变量是否已更改,我需要的是从AsyncTaskBuddy中更新变量使用静态字符串gpu2dcurent variable,它仍然显示默认值只需更改此行,new readgpu2d().execute(“blablabla”)
tonew readgpu2d().execute(“blablabla”).get()代码>我不需要更新TextView,我不需要它,它只是为了让我可以看到变量是否已更改,我需要的是从AsyncTask中更新变量正如我告诉您的,您正在尝试在完成异步任务之前获取值。因此,在使用gpu2dcurent
的值之前,请等待AsyncTask完成。使用AsyncTask的get()
方法。仍然相同。我不明白我做错了什么,你得等任务完成。在完成AsyncTask之前,必须调用它的.get()
方法,然后使用gpu2dcurent
变量。
protected void onPostExecute(String result) {
TextView tx = (TextView)findViewById(R.id.textView3);
tx.setText(result);
// Pass the result data back to the main activity
gpu2dcurent = result;
//Toast.makeText(getBaseContext(), result,
//Toast.LENGTH_SHORT).show();
gpu.this.data = result;
if (gpu.this.pd != null) {
//gpu.this.pd.dismiss();
}
}
package rs.pedjaapps.DualCore;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;
import java.util.concurrent.TimeoutException;
import android.app.Activity;
import android.app.ProgressDialog;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.TextView;
import android.widget.Toast;
import com.stericson.RootTools.RootTools;
import com.stericson.RootTools.RootToolsException;
public class gpu extends Activity{
public String gpu2dcurent = "1234567";
private ProgressDialog pd = null;
private Object data = null;
private class readgpu2d extends AsyncTask<String, Void, String> {
protected String doInBackground(String... args) {
Log.i("MyApp", "Background thread starting");
String aBuffer = "";
try {
File myFile = new File("/sys/devices/platform/kgsl-2d0.0/kgsl/kgsl-2d0/gpuclk");
FileInputStream fIn = new FileInputStream(myFile);
BufferedReader myReader = new BufferedReader(
new InputStreamReader(fIn));
String aDataRow = "";
//String aBuffer = "";
while ((aDataRow = myReader.readLine()) != null) {
aBuffer += aDataRow + "\n";
}
//gpu2dcurent = aBuffer.trim();
myReader.close();
} catch (Exception e) {
Toast.makeText(getBaseContext(), e.getMessage(),
Toast.LENGTH_SHORT).show();
}
return aBuffer.trim();
}
protected void onPostExecute(String result) {
// Pass the result data back to the main activity
gpu2dcurent = result;
//Toast.makeText(getBaseContext(), result,
//Toast.LENGTH_SHORT).show();
gpu.this.data = result;
if (gpu.this.pd != null) {
gpu.this.pd.dismiss();
}
}
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gpu);
this.pd = ProgressDialog.show(this, "Working..", "Loading...", true, false);
new readgpu2d().execute("blablabla");
TextView tx = (TextView)findViewById(R.id.textView3);
tx.setText(gpu2dcurent);
}
}