學習隨記-Toast提示，兩個Activity之間傳遞數據

一、四種Toast詳解

1.默認效果:

Toast.makeText(getApplicationContext(), "默認Toast樣式",
     Toast.LENGTH_SHORT).show();
2.自定義顯示位置效果:

toast = Toast.makeText(getApplicationContext(),
     "自定義位置Toast", Toast.LENGTH_LONG);
   toast.setGravity(Gravity.CENTER, 0, 0);
   toast.show();
3.帶圖片效果:

toast = Toast.makeText(getApplicationContext(),
     "帶圖片的Toast", Toast.LENGTH_LONG);
   toast.setGravity(Gravity.CENTER, 0, 0);
   LinearLayout toastView = (LinearLayout) toast.getView();
   ImageView imageCodeProject = new ImageView(getApplicationContext());
   imageCodeProject.setImageResource(R.drawable.icon);
   toastView.addView(imageCodeProject, 0);
   toast.show();

4.完全自定義效果:

LayoutInflater inflater = getLayoutInflater();
   View layout = inflater.inflate(R.layout.custom,
     (ViewGroup) findViewById(R.id.llToast));
   ImageView image = (ImageView) layout
     .findViewById(R.id.tvImageToast);
   image.setImageResource(R.drawable.icon);
   TextView title = (TextView) layout.findViewById(R.id.tvTitleToast);
   title.setText("Attention");
   TextView text = (TextView) layout.findViewById(R.id.tvTextToast);
   text.setText("完全自定義Toast");
   toast = new Toast(getApplicationContext());
   toast.setGravity(Gravity.RIGHT | Gravity.TOP, 12, 40);
   toast.setDuration(Toast.LENGTH_LONG);
   toast.setView(layout);
   toast.show();

二、Activity之間傳遞數據

1、向子頁面傳遞數據

父頁面：

  Intent intent=new Intent();
  intent.setClass(DActivity.this, DetailActivity.class);
  intent.putExtra("call", "From DActivity");
  startActivity(intent);

子頁面：

Intent intent=new Intent();
  intent=getIntent();
  CharSequence result= intent.getExtras().getString("call");

2、父頁面從子頁面取返回數據（但如果父頁面在TabHost中，則onActivityResult觸發,不知道爲什麼？）

父頁面：

  Intent intent=new Intent();
  intent.setClass(MainActivity.this, OtherActivity.class);
  intent.putExtra("main", "來自主頁面的參數");
  startActivityForResult(intent, 1);

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  // TODO Auto-generated method stub
  //super.onActivityResult(requestCode, resultCode, data);
  String result = data.getExtras().getString("other");//得到新Activity 關閉後返回的數據

  Toast.makeText(getApplicationContext(), result, Toast.LENGTH_SHORT).show();
  Log.i("onActivityResult", result);
 }

子頁面：

 @Override
 public void onClick(View v) {
  // TODO Auto-generated method stub
  Intent intent=new Intent();
  intent.putExtra("other", "from子頁面");
  setResult(1,intent);
  finish();
 }