传递一个阵列,Android的意图 [英] Passing an array with android-intent

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本文介绍了传递一个阵列,Android的意图的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我使用的achartengine库,我想通过一个意图通过图点的阵列,这样,当我点击一个按钮,它开辟了从主活动的数据图。目前我使用的是硬codeD阵列称为X在活动A,并试图将它传递给b活动。

活动答:

 公共无效lineGraphHandler(查看视图){
    线图线=新线图();
    意向lineIntent = line.getIntent(本);
    lineIntent.putExtra(点,X);
    startActivity(lineIntent);
}

活动B:

 公共类线图{INT [] X = getIntent(空).getIntArrayExtra(点);公共意向getIntent(上下文的背景下){
    // INT []×= {1,2,3,4,5,6,7,8,9,10}; // x值!    INT [] Y = {30,34,45,57,77,89,100,111,123,145}; // y的值!

不过我正在运行空指针错误和logcat的说:

 由Java.lang.reflect.Method.InvocationTargetException造成了


解决方案

你应该使用:

A级:

  int数组[] = {1,2,3};  意图I =新意图(A.this,B.class);
  i.putExtra(数字,数组);
  startActivity(ⅰ);

B类:

 捆绑额外= getIntent()getExtras()。
INT [] = arrayB extras.getIntArray(数字);

I'm using the achartengine library and I would like to pass an array of graph point through an intent so that when I click on a button it opens up a graph with the data from the main activity. At the moment I am using a hard coded array called x in Activity A and trying to pass it to activity B.

Activity A:

public void lineGraphHandler (View view) {
    LineGraph line = new LineGraph();
    Intent lineIntent = line.getIntent(this);
    lineIntent.putExtra("points", x);
    startActivity(lineIntent);
}

Activity B:

public class LineGraph{

int[] x = getIntent(null).getIntArrayExtra("points");

public Intent getIntent(Context context) {
    //int[] x = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 }; // x values!

    int[] y =  { 30, 34, 45, 57, 77, 89, 100, 111 ,123 ,145 }; // y values!

However I am getting runtime null pointer errors and logcat says:

"Caused by Java.lang.reflect.Method.InvocationTargetException"

解决方案

you should use:

class A:

  int array[] = {1,2,3};

  Intent i = new Intent(A.this, B.class);
  i.putExtra("numbers", array);
  startActivity(i);

class B:

Bundle extras = getIntent().getExtras();
int[] arrayB = extras.getIntArray("numbers");

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