我正在创建一个移动垃圾清理器应用程序，我想显示设备存储和 RAM 信息，例如可用空间和已用空间以及可用 RAM 和已用 RAM。喜欢这个形象。我只能以文本形式显示 ram 信息，但我被困在制作圆圈的过程中。 我想要这样的示例 是我的代码：
MainActivity.java
import android.Manifest;
import android.app.ActivityManager;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.provider.Settings;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.codebytes.mobilebooster.util.ContextUtil;
import com.codebytes.mobilebooster.R;
import com.google.android.gms.ads.AdListener;
import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import com.google.android.gms.ads.InterstitialAd;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.text.DecimalFormat;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class MainActivity extends AppCompatActivity {
private static final int EXTERNAL_STORAGE_PERMISSION_CONSTANT = 100;
private static final int REQUEST_PERMISSION_SETTING = 101;
private boolean sentToSettings = false;
private static MainActivity instance;
TextView txtTotalram,txtAvailram,txtUsedram,tv;
int progressStatus=0;
private Handler handler = new Handler();
ProgressBar circle_progres;
//Double t_ram,a_ram
ProgressBar pb_colored;
ImageView img_animation,img_leftanimation ;
float height,width;
public static int i=1;
private SharedPreferences permissionStatus;
Button mJunkCleanButton;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
txtTotalram = (TextView)findViewById(R.id.txt_totalram);
txtAvailram = (TextView)findViewById(R.id.txt_availram);
txtUsedram = (TextView)findViewById(R.id.txt_usedram);
pb_colored = (ProgressBar) findViewById(R.id.pb_colored);
setSupportActionBar(toolbar);
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
height = (displaymetrics.heightPixels);
width =(displaymetrics.widthPixels);
// double h = height*(1/100);
// double w = width*(1/100);
Log.i("heightwidth", "height" + height+" width"+width);
permissionStatus = getSharedPreferences("permissionStatus",MODE_PRIVATE);
ContextUtil.sApplicationContext = this.getApplicationContext();
mJunkCleanButton = (Button) findViewById(R.id.junk_clean);
mJunkCleanButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (Build.VERSION.SDK_INT >= 23) {
if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
if (ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
//Show Information about why you need the permission
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Need Storage Permission");
builder.setMessage("This app needs storage permission.");
builder.setPositiveButton("Grant", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, EXTERNAL_STORAGE_PERMISSION_CONSTANT);
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
} else if (permissionStatus.getBoolean(Manifest.permission.WRITE_EXTERNAL_STORAGE,false)) {
//Previously Permission Request was cancelled with 'Dont Ask Again',
// Redirect to Settings after showing Information about why you need the permission
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Need Storage Permission");
builder.setMessage("This app needs storage permission.");
builder.setPositiveButton("Grant", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
sentToSettings = true;
Intent intent = new Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
Uri uri = Uri.fromParts("package", getPackageName(), null);
intent.setData(uri);
startActivityForResult(intent, REQUEST_PERMISSION_SETTING);
Toast.makeText(getBaseContext(), "Go to Permissions to Grant Storage", Toast.LENGTH_LONG).show();
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
} else {
//just request the permission
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, EXTERNAL_STORAGE_PERMISSION_CONSTANT);
}
SharedPreferences.Editor editor = permissionStatus.edit();
editor.putBoolean(Manifest.permission.WRITE_EXTERNAL_STORAGE,true);
editor.apply();
} else {
//You already have the permission, just go ahead.
proceedAfterPermission();
}}
}
public String getTotalRAM() {
RandomAccessFile reader = null;
String load = null;
DecimalFormat twoDecimalForm = new DecimalFormat("#.##");
double totRam = 0;
String lastValue = "";
try {
reader = new RandomAccessFile("/proc/meminfo", "r");
load = reader.readLine();
// Get the Number value from the string
Pattern p = Pattern.compile("(\\d+)");
Matcher m = p.matcher(load);
String value = "";
while (m.find()) {
value = m.group(1);
// System.out.println("Ram : " + value);
}
reader.close();
totRam = Double.parseDouble(value);
// totRam = totRam / 1024;
double mb = totRam / 1024.0;
double gb = totRam / 1048576.0;
double tb = totRam / 1073741824.0;
// lastValue = twoDecimalForm.format(mb).concat(" MB");
lastValue = twoDecimalForm.format(mb);
// if (tb > 1) {
// lastValue = twoDecimalForm.format(tb).concat(" TB");
// } else if (gb > 1) {
// lastValue = twoDecimalForm.format(gb).concat(" GB");
// } else if (mb > 1) {
// lastValue = twoDecimalForm.format(mb).concat(" MB");
// } else {
// lastValue = twoDecimalForm.format(totRam).concat(" KB");
// }
} catch (IOException ex) {
ex.printStackTrace();
} finally {
// Streams.close(reader);
}
return lastValue;
}
public String available_ram()
{
String lastValue = "";
double totRam = 0;
ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo();
ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
activityManager.getMemoryInfo(mi);
long availableMegs = mi.availMem / 1048576L;
//long availableMegs = mi.availMem ;
DecimalFormat twoDecimalForm = new DecimalFormat("#.##");
totRam = Double.parseDouble(String.valueOf(availableMegs));
double mb = totRam / 1024.0;
double gb = totRam / 1048576.0;
double tb = totRam / 1073741824.0;
if (tb > 1) {
lastValue = twoDecimalForm.format(tb).concat(" TB");
} else if (gb > 1) {
lastValue = twoDecimalForm.format(gb).concat(" GB");
} else if (mb > 1) {
lastValue = twoDecimalForm.format(mb).concat(" MB");
} else {
lastValue = twoDecimalForm.format(totRam).concat(" KB");
}
String available = String.valueOf(availableMegs);
return available;
}
@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);
}
private void proceedAfterPermission() {
//We've got the permission, now we can proceed further
Toast.makeText(getBaseContext(), "We got the Storage Permission", Toast.LENGTH_LONG).show();
Intent intent = new Intent(MainActivity.this, JunkCleanActivity.class);
startActivity(intent);
}
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == EXTERNAL_STORAGE_PERMISSION_CONSTANT) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
//The External Storage Write Permission is granted to you... Continue your left job...
proceedAfterPermission();
} else {
if (ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
//Show Information about why you need the permission
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setTitle("Need Storage Permission");
builder.setMessage("This app needs storage permission");
builder.setPositiveButton("Grant", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, EXTERNAL_STORAGE_PERMISSION_CONSTANT);
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.show();
} else {
Toast.makeText(getBaseContext(),"Unable to get Permission",Toast.LENGTH_LONG).show();
}
}
}
String totalram =getTotalRAM().toString();
// txtTotalram.setText(totalram.concat(" MB"));
String availram =available_ram().toString();
txtAvailram.setText(availram.concat(" MB"));
Double t_ram= Double.valueOf(totalram);
Double a_ram = Double.valueOf(availram);
Double used_ram = t_ram-a_ram;
String usedram = String.valueOf(used_ram);
txtUsedram.setText(usedram.toString().concat(" MB"));
// int tot = Integer.parseInt(t_ram);
pb_colored.setMax((int) Math.round(t_ram));
pb_colored.setProgress((int) Math.round(used_ram));
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQUEST_PERMISSION_SETTING) {
if (ActivityCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
//Got Permission
proceedAfterPermission();
}
}
}
@Override
protected void onPostResume() {
super.onPostResume();
if (sentToSettings) {
if (ActivityCompat.checkSelfPermission(MainActivity.this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED) {
//Got Permission
proceedAfterPermission();
}
}
}
}