TableLayout中TextView水平对齐解决办法

tl=(TableLayout) findViewById(R.id.zhtj_list);                TableRow tr = new TableRow(ZHTJActivity.this);                LinearLayout ll1=new LinearLayout(ZHTJActivity.this);                ll1.setOrientation(0);                LinearLayout ll2=new LinearLayout(ZHTJActivity.this);                ll2.setOrientation(1);                ll2.setGravity(Gravity.TOP);                BorderTextView2 tv=new BorderTextView2(ZHTJActivity.this);                tv.setWidth(100);                tv.setHeight(100);                tv.setText("自然灾害");                tv.setGravity(Gravity.CENTER);                                BorderTextView2 tv1=new BorderTextView2(ZHTJActivity.this);                tv1.setWidth(100);                tv1.setHeight(100);                tv1.setText("自然灾害");                tv1.setGravity(Gravity.CENTER);                BorderTextView2 tv2=new BorderTextView2(ZHTJActivity.this);                tv2.setWidth(100);                tv2.setHeight(50);                tv2.setText("水旱灾害");                tv2.setGravity(Gravity.CENTER);                ll2.addView(tv1, 100, 50);                ll2.addView(tv2, 100, 50);                ll1.addView(tv, 100, 100);                ll1.addView(ll2, 100, 100);                                                LinearLayout ll3=new LinearLayout(ZHTJActivity.this);                ll3.setOrientation(1);                LinearLayout ll4=new LinearLayout(ZHTJActivity.this);                ll4.setOrientation(1);                BorderTextView2 tv3=new BorderTextView2(ZHTJActivity.this);                tv3.setWidth(50);                tv3.setHeight(50);                tv3.setText("7");                tv3.setGravity(Gravity.CENTER);                BorderTextView2 tv4=new BorderTextView2(ZHTJActivity.this);                tv4.setWidth(50);                tv4.setHeight(50);                tv4.setText("18");                tv4.setGravity(Gravity.CENTER);                ll3.addView(tv3, 50, 50);                ll3.addView(tv4, 50, 50);                                BorderTextView2 tv5=new BorderTextView2(ZHTJActivity.this);                tv5.setWidth(50);                tv5.setHeight(50);                tv5.setText("30");                tv5.setGravity(Gravity.CENTER);                BorderTextView2 tv6=new BorderTextView2(ZHTJActivity.this);                tv6.setWidth(50);                tv6.setHeight(50);                tv6.setText("70");                tv6.setGravity(Gravity.CENTER);                ll4.addView(tv5, 50, 50);                ll4.addView(tv6, 50, 50);                                                                                tr.addView(ll1, 200, 100);                tr.addView(ll3, 50, 100);                tr.addView(ll4, 50, 100);                                tl.addView(tr, new TableLayout.LayoutParams(300, 100));