我如何获取数组，哪些值是在另一个 class 的方法中获取的
How I can get array which values were get in method of another class
在 mainActivity 中我做了一个计时器，你每 3 秒点击按钮显示可用内存的值并在写入完成后写入 array.And，第二个按钮 "see chart" 保留可点击，我们点击并转移到下一个activity（第二个class）。
第二个class用线创建canvas，必须是创建图表，可以及时显示可用内存。 但是我不能在第一个class到秒class.
我需要在方法 运行() 中携带数组 "Masiv " 到我的第二个 class.
第一个class
package foxstrot.p3;
import android.annotation.TargetApi;
import android.app.ActivityManager;
import android.content.Intent;
import android.graphics.Canvas;
import android.os.Build;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;
public class MainActivity extends ActionBarActivity {
private Timer timer;
private MyTimerTask myTimerTask;
private Intent i;
long[] Masiv = new long[50];
int k;
private long freeMemory;
private Canvas canvas;
private G.DrawView d;
private int t = 0;
private long j;
private TextView tv;
private long r;
private Button b2;
MyTimerTask myTimerTask1 = new MyTimerTask();
int ii = 0;
ArrayList <Integer> AL = new ArrayList<Integer>() ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.textView);
b2 = (Button)findViewById(R.id.b2);
b2.setClickable(false);
//myTimerTask1.getMas();
//actManager.getMemoryInfo(memInfo);
//freeMemory = memInfo.availMem;
//tv.setText("freeMemory: " + freeMemory);
//Canvas canvas = new Canvas();
/*G g = new G();
G.DrawView d = g.new DrawView(this);*/
}
public void start(View v) {
timer = new Timer();
myTimerTask = new MyTimerTask();
timer.schedule(myTimerTask, 3000, 3000);
}
public void chart(View v){
i = new Intent(this,G.class);
startActivity(i);
}
@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);
}
class MyTimerTask extends TimerTask {
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
long getFreeMemory(){
ActivityManager actManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
ActivityManager.MemoryInfo memInfo = new ActivityManager.MemoryInfo();
actManager.getMemoryInfo(memInfo);
freeMemory = memInfo.availMem;
return freeMemory;
}
runOnUiThread(new Runnable() {
@Override
public void run() {
r = getFreeMemory();
k = (int)r/100000;
//setMas(k)
AL.add(k);
tv.setText("Free memory : " + k);
t++;
if(t == 5){
cancel();
b2.setClickable(true);
}
}
});
}
public void setMas(long p){
//if(ii==5){}
//Log.d("LOG_TAG", "SetMy_Array[0]: " + k + "SetMy_Array[1]: " + k);
ii++;
}
/*public long getMas(){
Log.d("LOG_TAG", "GetMy_Array[0]: " + k + "GetMy_Array[1]: " + k);
return k;
}*/
}
}
第二个class
package foxstrot.p3;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;
/**
* Created by Admin on 14.04.2015.
*/
public class G extends Activity {
int ii;
private long[] My_Array ;
private MainActivity mainActivity = new MainActivity();
//private MainActivity.MyTimerTask myTimerTask = mainActivity.new MyTimerTask();
//private long[] G_mas = myTimerTask.getMas();
ArrayList<Integer> AL = new ArrayList<Integer>() ;
Intent intent;
private boolean drawGraph = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new DrawView(this));
intent = getIntent();
//AL = intent.getIntegerArrayListExtra("Joker");
//Log.d("LOG_TAG","Al: " + AL.get(0) + "AL: " + AL.get(0));
//My_Array = myTimerTask.getMas();
//Log.d("LOG_TAG","My_Array[0]: " + myTimerTask.getMas() + "My_Array[1]: " + myTimerTask.getMas());
/*for(int i=0;i<G_mas.length;i++){
max = Math.max(max,G_mas[i]);
min = G_mas[i];
min = Math.min(min, G_mas[i]);
}*/
}
public class DrawView extends View{
Paint p;
Rect rect;
int uN = 0;
int uT = 0;
int y1 = 0;
int x1 = 0;
int n = 2000;
int t = 0;
public DrawView(Context context){
super(context);
p = new Paint();
rect = new Rect();
}
@Override
public void onDraw(Canvas canvas) {
final int cHeight = canvas.getHeight();
final int cWidth = canvas.getWidth();
Paint paint = new Paint();
paint.setColor(Color.WHITE);
canvas.drawPaint(paint);
paint.setColor(Color.BLACK);
paint.setTextSize(30);
canvas.drawLine(80,0,80,cHeight-60,paint);
canvas.drawLine(80,cHeight-60,cWidth,cHeight-60,paint);
for(int i=0;i<50;i++){
canvas.drawText(uT + "" , 10 , 25 + y1, paint);
uT = uT + 3;
y1 = y1 + (cHeight/50);
}
for(int i=0;i<9;i++){
canvas.drawText("|"+ uN, 75 + x1, cHeight - 25 , paint);
uN = uN + 1000;
x1 = x1 + (cWidth/9)-25;
/*int joker = 10;
canvas.drawPoint(20+ joker,20,paint);
joker = joker + 40;*/
}
paint.setStrokeWidth(10);
/*for(int i=0;i<My_Array.length;i++){
long xc = (My_Array[i] * (cWidth-80)) / 8000 ;
int yc = (t * (cHeight-60))/147;
t = t + 3;
canvas.drawPoint(xc, yc, paint);
Log.d("LOG_TAG","xc: " + xc + "yc: " + yc);
}*/
/*Paint paint2 = new Paint();
paint2.setColor(Color.RED);
canvas.drawPoint(cWidth, cHeight, paint2);*/
}
}
}
只需使用 putExtra() 和 getLongArrayExtra()。
文档：putExtra(String name, long[] value) and getLongArrayExtra(String name)
在MainActivity.java中：
public void chart(View v){
i = new Intent(this,G.class);
i.putExtra("foxstrot.p3.masiv", Masiv);
startActivity(i);
}
在G.java中：
private boolean drawGraph = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new DrawView(this));
intent = getIntent();
My_Array = intent.getLongArrayExtra("foxstrot.p3.masiv");
//...................
在 mainActivity 中我做了一个计时器，你每 3 秒点击按钮显示可用内存的值并在写入完成后写入 array.And，第二个按钮 "see chart" 保留可点击，我们点击并转移到下一个activity（第二个class）。 第二个class用线创建canvas，必须是创建图表，可以及时显示可用内存。 但是我不能在第一个class到秒class.
我需要在方法 运行() 中携带数组 "Masiv " 到我的第二个 class.
第一个class
package foxstrot.p3;
import android.annotation.TargetApi;
import android.app.ActivityManager;
import android.content.Intent;
import android.graphics.Canvas;
import android.os.Build;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;
public class MainActivity extends ActionBarActivity {
private Timer timer;
private MyTimerTask myTimerTask;
private Intent i;
long[] Masiv = new long[50];
int k;
private long freeMemory;
private Canvas canvas;
private G.DrawView d;
private int t = 0;
private long j;
private TextView tv;
private long r;
private Button b2;
MyTimerTask myTimerTask1 = new MyTimerTask();
int ii = 0;
ArrayList <Integer> AL = new ArrayList<Integer>() ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.textView);
b2 = (Button)findViewById(R.id.b2);
b2.setClickable(false);
//myTimerTask1.getMas();
//actManager.getMemoryInfo(memInfo);
//freeMemory = memInfo.availMem;
//tv.setText("freeMemory: " + freeMemory);
//Canvas canvas = new Canvas();
/*G g = new G();
G.DrawView d = g.new DrawView(this);*/
}
public void start(View v) {
timer = new Timer();
myTimerTask = new MyTimerTask();
timer.schedule(myTimerTask, 3000, 3000);
}
public void chart(View v){
i = new Intent(this,G.class);
startActivity(i);
}
@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);
}
class MyTimerTask extends TimerTask {
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
long getFreeMemory(){
ActivityManager actManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
ActivityManager.MemoryInfo memInfo = new ActivityManager.MemoryInfo();
actManager.getMemoryInfo(memInfo);
freeMemory = memInfo.availMem;
return freeMemory;
}
runOnUiThread(new Runnable() {
@Override
public void run() {
r = getFreeMemory();
k = (int)r/100000;
//setMas(k)
AL.add(k);
tv.setText("Free memory : " + k);
t++;
if(t == 5){
cancel();
b2.setClickable(true);
}
}
});
}
public void setMas(long p){
//if(ii==5){}
//Log.d("LOG_TAG", "SetMy_Array[0]: " + k + "SetMy_Array[1]: " + k);
ii++;
}
/*public long getMas(){
Log.d("LOG_TAG", "GetMy_Array[0]: " + k + "GetMy_Array[1]: " + k);
return k;
}*/
}
}
第二个class
package foxstrot.p3;
import android.annotation.TargetApi;
import android.app.Activity;
import android.app.ActivityManager;
import android.content.Context;
import android.content.Intent;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;
/**
* Created by Admin on 14.04.2015.
*/
public class G extends Activity {
int ii;
private long[] My_Array ;
private MainActivity mainActivity = new MainActivity();
//private MainActivity.MyTimerTask myTimerTask = mainActivity.new MyTimerTask();
//private long[] G_mas = myTimerTask.getMas();
ArrayList<Integer> AL = new ArrayList<Integer>() ;
Intent intent;
private boolean drawGraph = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new DrawView(this));
intent = getIntent();
//AL = intent.getIntegerArrayListExtra("Joker");
//Log.d("LOG_TAG","Al: " + AL.get(0) + "AL: " + AL.get(0));
//My_Array = myTimerTask.getMas();
//Log.d("LOG_TAG","My_Array[0]: " + myTimerTask.getMas() + "My_Array[1]: " + myTimerTask.getMas());
/*for(int i=0;i<G_mas.length;i++){
max = Math.max(max,G_mas[i]);
min = G_mas[i];
min = Math.min(min, G_mas[i]);
}*/
}
public class DrawView extends View{
Paint p;
Rect rect;
int uN = 0;
int uT = 0;
int y1 = 0;
int x1 = 0;
int n = 2000;
int t = 0;
public DrawView(Context context){
super(context);
p = new Paint();
rect = new Rect();
}
@Override
public void onDraw(Canvas canvas) {
final int cHeight = canvas.getHeight();
final int cWidth = canvas.getWidth();
Paint paint = new Paint();
paint.setColor(Color.WHITE);
canvas.drawPaint(paint);
paint.setColor(Color.BLACK);
paint.setTextSize(30);
canvas.drawLine(80,0,80,cHeight-60,paint);
canvas.drawLine(80,cHeight-60,cWidth,cHeight-60,paint);
for(int i=0;i<50;i++){
canvas.drawText(uT + "" , 10 , 25 + y1, paint);
uT = uT + 3;
y1 = y1 + (cHeight/50);
}
for(int i=0;i<9;i++){
canvas.drawText("|"+ uN, 75 + x1, cHeight - 25 , paint);
uN = uN + 1000;
x1 = x1 + (cWidth/9)-25;
/*int joker = 10;
canvas.drawPoint(20+ joker,20,paint);
joker = joker + 40;*/
}
paint.setStrokeWidth(10);
/*for(int i=0;i<My_Array.length;i++){
long xc = (My_Array[i] * (cWidth-80)) / 8000 ;
int yc = (t * (cHeight-60))/147;
t = t + 3;
canvas.drawPoint(xc, yc, paint);
Log.d("LOG_TAG","xc: " + xc + "yc: " + yc);
}*/
/*Paint paint2 = new Paint();
paint2.setColor(Color.RED);
canvas.drawPoint(cWidth, cHeight, paint2);*/
}
}
}
只需使用 putExtra() 和 getLongArrayExtra()。
文档：putExtra(String name, long[] value) and getLongArrayExtra(String name)
在MainActivity.java中：
public void chart(View v){
i = new Intent(this,G.class);
i.putExtra("foxstrot.p3.masiv", Masiv);
startActivity(i);
}
在G.java中：
private boolean drawGraph = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new DrawView(this));
intent = getIntent();
My_Array = intent.getLongArrayExtra("foxstrot.p3.masiv");
//...................